I find what you did was not only easier and a time-saver, but economical and practical as far as the customer was concerned. A quick and inexpensive repair - another one working.
@12voltvids
6 жыл бұрын
RoughJustice 2k18 Right and what those that don't understand how these power supplies work, will not shorten the life. If another led fails then it was already on its way out. Running the lights at 15 or under will ensure no further stress to any of the remaining leds.
@Zirok1982
6 жыл бұрын
Good fix. Last time I had to fix one of these Samsung TVs, I had quite a hard time. There was no datasheet for the LED backlight driver IC, and I couldn't find schematics anywhere. Turned out to be the red glue under a SMD resistor. It became somewhat conductive and was throwing off a transistor bias, causing the PWM coming from the main board not to reach the driver IC. Without that signal, the LEDs stay off.
@UnkyjoesPlayhouse
6 жыл бұрын
I love to see stuff repaired instead of being thrown away.
@12voltvids
6 жыл бұрын
We all learn hw this stuff works with every unit repaired.
@samkelly5251
4 жыл бұрын
Love this video. Thank you. Managed to fix my dads old 32" that he was going to trash. Now i have a 32 inch computer monitor.
@jhonkafirk
4 жыл бұрын
Ha, my buddy was about to throw his 65 inch as well, I decided to give it a try and now I have a 65 inch screen monitor and I love it.
@bruceyork5260
5 жыл бұрын
Dispite what some people are saying about your repair methods, you're doing what the client requests. I'll be attempting this repair on a Samsung TV soon, (my intial diagnosis was a faulty T-con board, this video has set me on the right path). Great video
@12voltvids
5 жыл бұрын
That's because those critics have no idea what they are talking about. When I hear them say things like you should have replaced the diode as now the rest are going to be stresses just proves they know nothing about how the current limited power supplies work. An led will drop its junction voltage no matter what. It is the current you are controlling not the voltage. The led strong runs at around 150 to 250 volts depending on how many LEDs are in the string. The power supply doesnt care. It is running on the current drop and it will maintain current bo matter what. The biggest killer of leds is turning up the backlight to full. Running on full will produce more heat and if there is a weak diode it will pop. Turning the backlight down to 75% max will ensure that none of them are stressed to the point of an early failure. 1 or 2 jumpers diodes will make absolutely no difference at all. I have been running one at home I fixed 2 years ago and the only way you can tell is if I put up an all white screen then you can see a slightly darker area. Some people make accurate comments but most are just repeating someone else's uneducated opinion. On this set it was fix it as customer requested or scrap the set. This one is still working fine.
@bruceyork5260
5 жыл бұрын
12voltvids I've read through all of the comments, I did notice a lot of people saying the same thing. Your video has given me the confidence to make the repairs to my tv. Again great video and it will be my "go to" reference video to make my repairs, will save me some money. I did check the backlight setting on my LG led/lcd tv, it was on 70%, changed the setting to 60%, the tv is seven years old and still going strong.
@henryv5000
3 жыл бұрын
Thank you so for your technique LED repair and Troubleshoot Save me time and my TV work again
@davidayres7973
3 жыл бұрын
Just picked up a Samsung tv with the same problem. This video has definitely helped and no doubt ill be able to fix it now. Seems like a common fault. 👍👍
@amrantomer8005
4 жыл бұрын
I fixed my UA46F5000 thanks to you! I had a single defective LED just like you had. A simple jumper fixed it like a charm.
@densbluegrasscorner9389
5 жыл бұрын
Great video! I had my own TV shop from 1976-84 in Michigan, but never worked on the LED/LCD TVs before. Another problem with over driving the LEDs is permanent screen burn from stationary images. I know, because I created that problem on my 65 inch Samsung LED TV. Using the "dynamic mode" constantly caused large dark areas on the display. Thanks again for sharing this video.
@12voltvids
5 жыл бұрын
LCD TVs suffer image retention, but it is not caused by the backlight level. It is pixels that stay in one state for a long time tend to stick, and this can me permanent. LED tv is still an LCD panel, just the light source is LED as opposed to fluorecent. OLED and Plasma on the other hand, and CRT for that matter will get permanent screen burn. Look at my latest lorex camera video from yesterday and I show a shot from my old CRT camera monitor all burned to crap. Even when it is off you can see the image.
@jimantonellis8653
5 жыл бұрын
Great video. I appreciate you taking the time to post this. A huge time saver knowing how to test the strips without tearing down the entire assembly! Thanks 12voltvids!!
@kristiandawe85
6 жыл бұрын
A cheap repair that can literally save people hundreds or possibly thousands, bridge out the dead led with a few cents worth of wire and solder, it's a shame so many people would just throw the set away. Great repair as always.
@1959Berre
6 жыл бұрын
Most end users have no clue: 'If it is dead, it is dead'
@allenfleckney5969
6 жыл бұрын
Hundreds or thousands. The part is less than 1 Dollar and he botches it. Never by pass
@12voltvids
6 жыл бұрын
Send me a set of 3 strips for a dollar! You can't just replace a single LED. There is no gain doing that. First of all you can't easily remove those chips as they are bonded to the heat sink, and even if you do how are you going to bond the new one to the heat sink? You cant just solder one across it, as it will overheat in a few seconds and fail. Trust me on that one I tried that a few years ago. These are not the same type of LEDs used in light bulbs, and they also have the crap driven out of them. If you are going to change them then you need to order in the entire set for the panel otherwise you are no further ahead. This works, and I have 2 sets that have worked after jumping a bad LED for years. Just turn the brightness of the back lights down. 0.107 volts more across each LED is not going to hurt them. Usually why a single LED fails in the first place is not due to it being a bad LED. It is because it wasn't bonded properly to the heatsink at the factory and overheated. The rest that haven't failed are generally OK.
@jibugeorgekutty4545
5 жыл бұрын
12voltvids your observation is high end and appreciated ,i started tv repairing my age 17and I didn’t know fully operation during that time but I know several thinks how to check all the active and passive devices.All the times i under stood observation is main things that will find all the issues.
@jeffjohnson814
5 жыл бұрын
jumping out the dead led's is not the way to fix this. it will just cause the rest to go out sooner.
@faithless8888
6 жыл бұрын
You're right about not using the backlight for 100% full brightness! I use my Samsung Led TV with 10 out of 20 backlight brightness. And even with that setting it is stillbright enough! I even think all of my settings are just set in the middle. After 8 years, the TV is still going strong!! Indeed a good tip everybody!! Sorry for my bad English...
@gs-mt8zd
6 жыл бұрын
All things considered, this is an appropriate repair for this situation(waitng time, cost,etc) and it seems that no matter how often you say it, some people just don't get it! Dave, you have a lot of patience giving the same answers over and over, that would drive me bonkers.
@12voltvids
6 жыл бұрын
It is draining. Some people just don't get it, and never will.
@Washburn-rr5eh
5 жыл бұрын
Another great video. I like how you challenge these other techs when they start talking crap. Most of them can not back up there statements but you certainly can. Your hard work is greatly appreciated..
@truth0077
4 жыл бұрын
How much is a strip of led lights
@ZL2WHO
4 жыл бұрын
Refreshing to see you keep the heat on for a good few seconds when soldering. Just picked up a 46in Smart Samsung and have found 2 failed leds in the same string. Now its time to visit the TV shop and see if they will give me a few strings from a S/H parts box. I can just hear them now... Sure, that's $50.00 thanks. lol.
@antonglebov3086
5 жыл бұрын
Thank you for this video. I was able to revive a broken TV by bypassing two burnt out LEDs.
@OriginalMergatroid
4 жыл бұрын
A real backlight tester works really well, and they are dirt cheap. Mine has saved me hours of fiddling. They automatically adjust the voltage, and can be used for single LEDs or entire arrays. No jumpers, bare wires or alligator clips required. Also, the most common failure after repair is another backlight going bad, even after adjusting the backlight brightness down. Replacing individual backlights is not recommended because other backlights that may appear to be working perfectly can still be damaged and fail within a month. We always recommend replacing all the backlights as a kit. If the customer insists on just replacing the one failed LED, we only offer a warranty on that LED, and not on any of the other backlights. People have brought their TVs back up to three times before finally saying they will just purchase a new TV when, if they had of done it right and replaced all the strips their TV would stay repaired.
@12voltvids
4 жыл бұрын
I don't fix tvs for customers. They are all my sets and they have all been fine. I give them away after they are fixed. The only ones I have done for "customers " which are friends I have done more as a favor and charged them perhaps 50.00. That is their limit when they bring them to me, so there is no way to replace all of them. When the backlight kit sells for 100.00 by the time it gets here and labour on top would push repair to a minimum 175.00. Nobody will spend that when a new one is 200.00. I don't accept tvs from people and the ones you see are generally mine. That is why I am so fast to condemn a set that has a bad processor without attempting to replace a board.
@enriquegutierrez4523
5 жыл бұрын
I really liked your video. You are really knoweledgeable i appreciate the fact you have taken the time to share it
@NunYa953
5 жыл бұрын
Originally, I watched your videos to learn some basics and have been successful fixing all kinds of stuff. Now I find myself watching you fix thing I could care less about. Officially, Im addicted to this channel. Does anyone know a good support group?
@Washburn-rr5eh
5 жыл бұрын
12 volts anonymous!!!
@NunYa953
5 жыл бұрын
@@Washburn-rr5eh I've even picked up a Canadian accent...eh
@radioman4738
3 жыл бұрын
You helped guide me in the correct direction for fixing a LED TV. Thank you for this video very nice of you to share what you are doing.
@12voltvids
3 жыл бұрын
Well I do make a couple bucks a month for my effort.
@danielmeecham464
3 жыл бұрын
OUTSTANDING! One the most professional, step-by-step, yet succinct repair videos I`ve watched. I repair a tremendous amount of electronic and mechanical devices and found this one particularly helpful. Thank you kindly sir!
@jamienoel
2 жыл бұрын
I know this is a few years old, but just wanted to say that when I replaced the LED strips in my Samsung, I used thermal tape to attach them to the metal back in hopes of dissipating more heat to hopefully longer. Over a year and so-far, so good!
@xeroinfinity
6 жыл бұрын
i see this a lot in new tvs. I agree if you turn them down to 50% or below they will last longer and possibly never fail
@andrewziegler2608
5 жыл бұрын
Awesome video. I didn't even think about jumping the LED. I was about to just replace all the strips and get a new board if I had to. Thanks
@SinnerSince1962
3 жыл бұрын
One thing that slightly confused me is when testing the strips individually before tearing it all apart, you used 50V as source voltage. When removed, you used 30V. Does it really make a difference except for how bright it will get?
@larrypierce2777
5 жыл бұрын
I guess you went where not many TV repairmen go because I think they don't think it's worth fixing them. You've just proved them wrong. You've absolutely taught us so much. Now If I can remember those voltages, I'll be fine. I like the way you isolated each backlight. Are the backlight strips that expensive? Missing one isn't so bad. You made it look so easy but I know the experience you gave yourself and us it well worth the time. The reason people throw them away is because they don't know how to fix them, they don't have the money to fix them, they've been told that they're unfixable by a lot of TV repairmen. Plus, if the repairmen have to dig that deep, they are going to charge people an arm and a leg. Just a heads up on copyright law. If you have a business, you come under the fair use law and you can use the KZitem feed for up to 30 seconds with any flack. Only if it's for your business for testing purposes now.
@12voltvids
5 жыл бұрын
I stick to 8 seconds to be safe. In a shop environment this repair probably not worth it. Took a good 2 hours. At shop rates that isn't worth it. I charged them 100 and they were happy as a pig in mud. It was a free TV they got from the cable provider for signing up. Simple repair but most shops are not going to go through the trouble of disassembling the screen
@larrypierce2777
5 жыл бұрын
@@12voltvids Yes I know but you, doing this out of your home, you can be a kind soul and I can see that. You're just a good person. That was a fascinating fix though even if it took awhile. Thanks for replying by the way.
@12voltvids
5 жыл бұрын
@@larrypierce2777 I try to fix as many as possible and show how it's done. I make my money from the video advertising. So I can do these jobs that someone making a living from just could not do. If I still did this for a living I would have moved on real quick to the next and I would be living off the estimate charge like the majority of the shops still in business. I left the business in 2003 because I could see the direction it was headed and got out at the first opportunity.
@bluemax229
4 жыл бұрын
How many volts are LED's commonly used in TVs? (Specifically Samsung 60") I guess what I mean is what is the voltage specification for a single LED? I've spent the last 2 days watching about 50 videos on the subject. This is the best one!
@12voltvids
4 жыл бұрын
It depends on how many LEDs there are and how they are configured. So there is no magic number. They all differ by model.
@squareroot99999999
6 жыл бұрын
@7:17 Aren't we glad that our power supplies can handle temporary dead shorts? Fun stuff.
@realmccoy813
3 жыл бұрын
Lol...
@jacquesbezuidenhout4882
2 жыл бұрын
Thank you repaired my son's tv quick and easy by watching your video 🙂
@EvanSchulte-lf6qi
2 ай бұрын
Ohhhhh buddy. I'ma about to make a lot of money. I have found about 7 TVs just this month. 5 worked and 2 were smart TVs with the backlight not functioning. Sold the 5 other tvs for cheap because they weren't smart TVs. 1 70" smart TV and a 40" smart tv both with back light out are about to get died and sold for 150$-250$ minimum on FB market place and/or offer up. This video helped me out a lot!!
@12voltvids
2 ай бұрын
I've given up on tvs.
@dl4511
5 жыл бұрын
Remember the phrase, "getting the bugs out?" Got him out at 11:01. When I worked on TVs back in the late 60's, a lot of them were still using vacuum tubes. I'll never forget one TV I opened up and 100's of cockroaches started running away. They probably liked the heat from the tubes and enjoyed eating the paper on transformers and the wire sleeves. Disgusting, I made sure to bill the customer for a can of raid. When I change my LEDS, I'm going to use a heat gun to soften the double sided tape and avoid tearing the diffuser. Might also be able to heat it again to reattach.
@mcdevious2229
2 жыл бұрын
Nice job. Thanks for the information. I'm looking at one (Samsung UN40H5003AFXZA) that the 150 volt LED supply won't work with the LEDs plugged in. I put 50 volts on each LED section, and two started bright, then went out. The last one works and according to my meter pulls 50 mA. The other two appear not to draw any current. I'm still suspicious of the power supply although I've found no "smoking" gun 🙂. Even though the two don't appear to pull any current, the power supply still fails when the LEDs are plugged in. Hmm. I like that you actually troubleshoot things. :) Okay (8/28/22), I replaced the LEDs and the power supply works. I would strongly recommend against placing 50 volts on any LED strip. I would start at about 24 volts, and sneak up on it. At about 3.2 volts, this type of LED is pretty close to maximum brightness, so for 13 LEDs, that's 41.6 volts maximum for 12 LEDs it's even less. There is a 150 volt supply for the LEDs (it measures closer to 180). What you may have missed is that Samsung put a [switch-mode] current regulator in the LED strips' return path, and it runs at about 25 % duty cycle. I measure about 103.5 volts across the LED set when operating. This works out to about 2.72 volts per LED, which makes sense. Thanks again for the information and video. I'm not convinced this one has adjustable brightness.
@krepairs6044
4 жыл бұрын
Extremely informative video, all steps and proper procedures were documented with clear instruction, thankful to have come across this video, just picked up a 55 LED Samsung with a backlight issue, hoping to put my soldering skills to the test! Thanks!
@dannybfmv
2 жыл бұрын
Did you manage to fix it, I have a 55" with backlight issues too
@krepairs6044
2 жыл бұрын
@@dannybfmv Hey Danny! So I had ordered the individual LEDs to solder on, did a few strips and such, but it still wouldn't display properly, made me question if buying the strips would of fixed it! I eventually called it after about a days work on the TV, there were far too many burnt out to do them individually
@dallaspilotcar9293
4 жыл бұрын
I do not see the bad connections that you are talking about.. I creased and tore my reflector that was on the back of the TV and i do think you are able to see it when you get the TV back together. It was stuck down with double sided tape. This panel will not last long with this jumper in place because most likely the existing LEDs are already being over driven by too much current and the jumper will just make the current be higher for the remaining LEDs. You only made one connection from the good led bypassed over the bad LED?
@markt9438
3 жыл бұрын
just had to stop at the power to the LED testing ! Well you know if the wire source is bad you get no power to the LED ! I found that out after i replaced to bad strips and went and did them all ! But make sure you supply wire is working first after you put in new LED!
@TK42138
4 жыл бұрын
Brilliant diagnosis and repair video.
@krzyhoo2
5 ай бұрын
Thanks a lot, I was able to fix my TV, just an hour of work, no need to wait weeks for new LED strips from china and you don't even notice the lack of one diod
@lesbsocal9107
5 жыл бұрын
When you connect the 50V to test the leds, do you set current limiting on your bench supplies to keep from smoking the leds? Or is there something downstream that limits the current? Great vid BTW. I have a ~2011 Samsung 55 incher and the right half of the screen is dark, so I suppose the led arrangement is different for that model. I will find out when I take it into surgery.
@nicolastribie4889
4 жыл бұрын
Fixed it.. thanks ! What a bad design ! Today even christmas lights don't fail anymore if one single LED is faulty !
@12voltvids
4 жыл бұрын
How many strings of faulty LED christmas lights would you like me to send you. I have about a dozen. Long strings of 70 lights either the first 25 or the last 35 are out on most. 1 LED went open and the rest on the string went out too. If they short then the rest keep working, but if one goes open they all die. I have hundreds of dollars in broken lights. I put up so they look like crap so I can tall everyone, see how bad these are.
@rightside9631
5 жыл бұрын
I liked when they had Plasma screens. They lasted years. I still have a 12 year old 50 inch Plasma screen and its never had a problem
@12voltvids
5 жыл бұрын
They got rid of plasma sets for 2 reasons. 1) they were pretty reliable, and 2) the sucked back a fair bit of juice, but they shure looked good. I have several plasma sets here. A few the panels are slowly starting to fail, but the rest of them look great and they are 10 years old and older.
@litzdog911
6 жыл бұрын
Fascinating! Hadn't seen the inside of the backlight assembly before.
@Fazwaans
6 жыл бұрын
Thanks for sharing this vide , I have same tv with 3 led were not working, i replaced the led bulb and all the leds were working, when i put the led strip back, As soon i connected the led connectorsame led bulb blow again. Do u think someting to do with power supply? Can u kindly help me with this. Thank u.
@johnbeaudette583
3 жыл бұрын
Greetings, Thanks for the Vid. I have a HiSense 55" Roku TV It shut off the other day and would not turn back on. The standby light turns on when plugged in then dims and flashes once goes black for a couple seconds this sequence repeats continuously. I replaced the power board. Same issue. I measured the power from the USB port and the USB power seems to cycle with the light sequence. as if the TV is rebooting. Any ideas ?
@zx8401ztv
6 жыл бұрын
Great repair, i could not see any dark spots, plenty good enough for a tv :-D. Leds do seem crap for that job, but i've seen quite a few cfl backlight monitors that lose a tube or even the h.v driver just dies on one output. Leds do seem to die far too early thought.
@NunYa953
5 жыл бұрын
I wish mine only had one LED out. I got the TV for free and decided I'd replace the individual LEDs instead of buying new strips. Start to finish took about 3 hours. Once you get into a rhythm with a hot air gun and some solder paste its not that bad. Cost me $12 and 3 hours.
@drinkthemup
Жыл бұрын
Best replacement video for backlights.
@charleyswanson1473
5 жыл бұрын
I have a Samsung UN65H6203AFXZA Version no. MH01 that has had a new powersupply installed, but the same problem is still there. The red standby light is on full time and you cannot turn the tv on or off, no response with the button or remote. Where would you start looking for the problem? I'm very techincal and have repaired a few led tvs in the past. I hate to throw away a 65 inch 2 year old tv if I don't have to. Thanks!
@dallaspilotcar9293
4 жыл бұрын
Are you able to use the LED tester to check all of the backlight LEDS from the connectors that plug into the power supply board? I took my TV apart again and took the panel outside and held up and looked through it using the sun as the light and I did not see any damage. I just do not understand why the backlights do not comeon. When I checked each tv individually they work. but, Idk how to check to see if they work as designed . I called Hitachi but they are closed today
@tonycosgrove6433
6 жыл бұрын
These new tv's are not lasting very long just over 2 years old not good my plasma is 7 years old and still going strong. good fix though dave you saved another from the landfill.
@yardiekenm500
4 жыл бұрын
Thank you very much solder the power supply board and everything's working again I thought I was going to go all the way to the back lights I've bought an expensive tester at least I'm ready for the next repair once again thank you 55 inches is going into my bedroom now once again thank you
@yaron881
5 жыл бұрын
Thanks for the educated movie. I have one question please: What would be the cause for one stripe of LEDs to work not on full power ? The picture on the top part of my Samsung tv shows but looks dimmed or darker Thanks
@DavideRizzotti
5 жыл бұрын
I saw another video where, after changing the smd led with bad results (burning again) he decided to jump the burned led with an old fashioned led THT. What do you think?
@lylereynolds217
3 жыл бұрын
I have the same Samsung tv, only 2 leds on the backlite strips are working, all other leds are out. Lot of information supplied but no mention of my possibility
@BillyLapTop
6 жыл бұрын
Great repair! Great advice on the backlight settings.
@riverhuntingdon6659
6 жыл бұрын
Nice simple repair. I did wonder about bridging the dud LED, but given the number of 'em in the circuit, and also that you've turned the backlight down somewhat, it should outlast the tv. Probably can't get the LED for love nor money either :-)
@parasjhalani7478
4 жыл бұрын
As per your video I can see the logo of samsung through flash at the time of turning it on. I have a Samsung Led Tv 40 inch which has edge lit strip inside. I have checked the power supply board which has +led,nc,nc,-led which is connected to the edge lit led . The output voltage I can see is 89.9v from the board but the led strip is not turning on. After led drop the voltage is around 68 volt. I have tried power each led through a 9v battery and every led is turning on. How should I get it repaired ? please help.
@jamiehall5500
4 жыл бұрын
i have the bn44-00775a board for the 60in. No backlights, replaced them still no backlights. Old ones just flashed off and on nonstop with several burned out. New ones check out fine but no backlight when i get them into the tv. I have picture and sound. Measure 12.3Vdc to main board but 380-400vdc to the led d+. Legend says it should be 326v. Any ideas what to try next?
@TboneLoyal
3 жыл бұрын
Never thought of jumping over the LED. Seems like a good fix if its just one LED bad.
@12voltvids
3 жыл бұрын
Tv has been running for years. Have done this a few times. I don't do much work on tvs anymore. They are so cheap that people just recycle them and get a newer cheaper better model..
@TboneLoyal
3 жыл бұрын
@@12voltvids Thank you so very much. It helped me alot. I love working on things and I have watched you almost a year. Great stuff. thank you
@wrenchturner9848
4 жыл бұрын
Could you probe the lighting string connector and check resistance or continuity rather than sending voltage down it? I don't have a bench power supply.
@vincentheiselman233
4 жыл бұрын
I have model LC50LB26IU and the Tab Boards seam to be hot glues to the base.Any ideas sir
@theone2be33
5 жыл бұрын
Please help. I have same problem. I have 55inch Samsung UHD 4k TV. I bought new strips and still tv doesn't work. When you were testing the leds individually at the end of video with voltmeter, did you have power going into strip? Or was it your voltmeter causing the led to light up? I only have a voltmeter. No other fancy equipment. Please help. I even replaced the power board. Only thing left is main board.
@lesbsocal9107
5 жыл бұрын
Power was not on. For testing leds he used a multimeter in the diode-check mode. In that mode the meter supplies its own voltage, usually about 3V. You can get a decent multimeter at Harbor Freight for cheap.
@ryans413
6 жыл бұрын
I have an 55" Vizio LED 4K TV it's not bad it's a P series model with 125 local dimming zones it's pretty good for an non OLED TV. I never keep it at full brightness for two reason one I'm in kinda a dark room and full brightness would kill my eyes and two you don't need to watch on full brightness. The TV I have has three presets Low Medium High Off I usually keep it at Medium and is good. You can also adjust it your self if you click the preset to Off. I keep it at 75 it can go to 100 but just seems too bright it's nice these sets can get bright but that's to strong for my eyes.
@thomas5816
4 жыл бұрын
can I use wires from some earbuds to skip over the broken LED? And can I make a proper connection with sautering?
@slight1699
Жыл бұрын
Thank you! My two-year old Samsung QLED went out just out of warranty. It is going bright/dim/bright/dim. Now I know that this is the backlight going out (I'm no computer tech), and I had the brightness turned up to high. Bought a Bravia to replace it, but wondering if it is worth repairing the Samsung?
@Tech_481
Жыл бұрын
It might be around $50 to buy the replacement backlights but while replacing the backlights you might crack the lcd. My best suggestion is to throw it up on Marketplace and let someone pick it up that wants to try to repair it and no scrap it!
@iancucorina9680
4 жыл бұрын
Hello...is there any way to glueing back a LED lens? I broke one off....tried a glue gun and....it appears when I start the TV
@68pishta68
3 жыл бұрын
could you test continuity on the + to - wires on each strip for an open? I seem to have a backlight issue and I tested continuity on each strip and I had it in one direction and not the other (ala LED characteristic) Think I still have an issue? I measured 47V on each of the 2 LED feeds. Sharp 43" LC-43LB481U. All voltages were present on the power board, images visible with flashlight. If I cut the dimmer wire will it bypass a possible dimmer issue or will loss of dimmer signal make it not light? TV was heading to the dumpster anyway so I thought I would take a stab at it. suspected the power board but it seems to test ok unless that 47V is way low
@12voltvids
3 жыл бұрын
You can test each led with a meter. I have done that.
@realmccoy813
3 жыл бұрын
Good job.....
@mrsemifixit
6 жыл бұрын
Could a resistor or diode be used instead of a straight jumper wire? Maybe a 3v Zener diode? To keep voltage drop across each led relatively the same to not stress the other leds? Just curious in terms of longevity
@12voltvids
6 жыл бұрын
Do the math. The voltage increase is 0.107 per LED. Not going to hurt it. Now if you were to remove 5, well then you might have an issue. This increase can be offset by just turning down the level anyway, and for that matter I should go into the service menu and turn down the master limiter.
@maxwebster7572
4 жыл бұрын
Would it not be easier just to run a resistor across the bad led? I'm having a similar problem, just about ready to test leds, I have power at driver, changed main out but I also have no screen menu on flashlight test and no chime.
@12voltvids
4 жыл бұрын
No. LEDs are not resistive devices. Jumping it won't hurt it. My tv has been running with a hundred led for 2 years.
@browntrout3994
5 жыл бұрын
I have samsung syncmaster 2253BW ...I hit power button and the picture appears fine for about 2-3 seconds and goes away. Turn off power and hit power again and picture is back again for 2-3 seconds again Any ideas? I'd really like to save this monitor cause its a double monitor setup and would like to keep them paired ;-)
@montanajones8393
3 жыл бұрын
Thank you for the very informative video. Does flickering on one side of the screen also indicative of bad led backlights as well? My tv initially had flickering on on side but after about 20 minutes the flickering would stop. The side that was flickering would be darker. Now after the flickering stops, the picture remains very dark. I would hate to see another tv just going to the landfill but is there another test for cause of flickering that can be done?
@oldguy8177able
2 жыл бұрын
abl,automatic brightness limiter ,12voltvid did a video on it,he replaced a resistor on a panasonic in the abl circuit.
@oldguy8177able
2 жыл бұрын
12voltvids has done a few vids on flickering,one of them the board was loose and he tightened it that fixed it,his theory board was warming up,the board was sending signal to leds .
@AvilaBrosGamimginc
5 жыл бұрын
I have the same issue with my Samsung tv and we've only had It for a little over a year. Is this repair expensive?
@crbenito
4 жыл бұрын
Hi there. Thanks for putting together this video. I have a u5002 with low backlight emits about half of what it used to be. Yes, I have running it at 20 to compensate for that. Is there a way to adjust it back up again? I thank you for your reply in advance.
@12voltvids
4 жыл бұрын
Change the LEDs or buy a new TV. The problem with LEDs is they start to lose brightness the minute they are turned on. As the hours add up, they become dimmer and dimmer.Not much you can do about it. By 10,000 hours they will have lost about 50% brightness.
@frednyambega2887
4 жыл бұрын
I have this problem with my tv and I need your help
@SinnerSince1962
3 жыл бұрын
So basically, Samsung has scientifically researched the amount of impurities needed to induce a certain lifetime on LEDs. Then, they test and obtain an average lifespan. They wire the LED's in series knowing the lowest average LED installed in said strips is the one forcing a new purchase of a TV set. Very clever, Samsung.
@renitaedmonds72
4 жыл бұрын
WHAT IF ALL THE BACKLIGHTS WERE WORKING WHEN YOU TESTED THEM BEFORE REMOVING THE PANEL? WHAT WOULD HAVE BEEN THE NEXT STEP. NOW WE HAVE BACKLIGHT TESTER.
@2allure
4 жыл бұрын
Hi, what can I do, If I do not have external 50 V power supply? Thx!
@setychan7684
2 жыл бұрын
Mine was being fixed supposedly but when they put the new backlights it was burned again. The damage before was that half of the side of the TV has no backlights functioning. Now when they put the new ones it got burnt. Should this be between the main board and power supply? Please answer please please please sir.
@rotemcohen6239
4 жыл бұрын
hi while you measured the output voltage from the p.s board to the LED strips, you put the positive probe to each pin. and your black probe was always connected to chassis/ ground? since each LED strip connected to DC voltage, i thought you should connect the black probe to the negative pin, and the red to the positive. while i measured my board this way, i got a strange readings. but when i put the negative on the ground, the voltages showed fine. what is the correct way? thanks
@12voltvids
4 жыл бұрын
The 3 strips are in series so using the chassis as the ground reference makes it easy to find the open strip.
@rotemcohen6239
4 жыл бұрын
@@12voltvids Thanks But if i put my probes on + and - i dont get a correct reading. But if i put my probes on + and ground, than the voltage reading is correct. Is it should be like that, or maybe something is bad in my p.s?
@hellendohora367
5 жыл бұрын
thank you very good video
@EastAngliaUK
2 жыл бұрын
nice tv and repair
@electronicartis
6 жыл бұрын
I did this repair a while back for a client by putting a resistor in space of the burn out led and it did not work for long the client come back saying the screen stopped working I replace the LED and put an extra LED it's been about 6 months now and client has not complained. I think that will help on fix and make it last longer.
@12voltvids
6 жыл бұрын
Electronic Artis My Hitachi set I use as a digital advertising sign runs 24/7 and I jumped the bad led 3 years ago. It is also cranked up full so it can be seen from the street during the day. Still going strong. A resistor won't cut it. The reason your panel probably failed is because other leds were also stressed from operating at full brightness. If you are going to change the lights replace all the lights at once.
@electronicartis
6 жыл бұрын
12voltvids what are your thoughts about adding an extra LED diode in the panel will it help preventing burn out.
@12voltvids
6 жыл бұрын
Not necessary. Just jump it. No resistor necessary, that would probably create a bigger issue, as the power supply will push more current to all the rest to over come the resistance. LEDs are not resistors. They have a specific voltage drop. Removing 1 in a 28 series string will increase the voltage across the remaining LEDs by 0.107 volts. Putting a resistor could increase it more because the power supply is going to crank up the voltage to compensate for the current being consumed by a resistor.
@lmnhs-srcyadriannepomuceno6561
5 жыл бұрын
Maraming salamat sir.. Galing mo... Tnx..
@demoking1422
4 жыл бұрын
Nice video informative and to the point , also good job on pest control methods here noted also . Thanks
@klimaatgek1776
3 жыл бұрын
great!
@tmho7091
5 жыл бұрын
Hi 12voltvids, thanks for the great video on showing us how to fix the no black light problem. I have a led tv also with no black light problem. But it is with a curve screen. Do you have any experience and/or suggestions in how to handle the screen? I am afraid it will break when I try to take it out before checking the leds.
@MjrTraumaVictim
2 жыл бұрын
I Would suggest using the glass panel suction devices attached to home made bent pipes in the same arc as your curved screen, it could work!
@josephnealescratchcards
6 жыл бұрын
Awesome video as always
@tomdewey9907
6 жыл бұрын
Maybe going forward, find a scrapped Samsung LED backlit TV and pull the LED strips out for donor individual LED replacements? I'm sure you'll be getting more of these LED backlight TV's in for the same problem/failure.
@12voltvids
6 жыл бұрын
Tom Dewey The strips are panel specific so unless I have a same model panel I won't have the lights. I could have ordered a new backlight but this is a customers set and they are not about to wait for parts. They want it fast or they are going to buy a new one. So waiting for a week or 2 to get a part from a recycler and paying for the parts plus shipping would push the cost of the repair beyond what someone will pay. So it is bypass the led and put back in service or the set gets scrapped. Even if it was my set I wouldn't have replaced it because I am cheap and you won't see the loss of the individual light nor will it shorten the life. I have 2 led lights that I have fixed by jumper a dead bulb. One is in the cabinet of my aquarium and I have been leaving that one run 24/7 under test. It has been going for several years. Hasn't affected it at all. Neither is the Philips bulb I jumped a bad led. That one is over the sink in the kitchen and it runs all day and night and is only shut off at bed time.
@Beauchot78
3 жыл бұрын
Great video! Nice repair! I can tell you know you way around a circuit board!
@manpreetsinghbawa9067
2 жыл бұрын
Very nicely explained. Thank you so much.
@amitaimedan
4 жыл бұрын
Really good video...
@Hi-Tech-Ray
6 жыл бұрын
The thing that I don't understand is why doesn't the MFG put in some kind of limiting circuits or cut down the current going to the back lights at maximum setting (Kind of leaving some bit of headroom)? Ex if per say one strip allows 30VDC max the maximum setting 20 or 100 US be preset at 28VDC?
@12voltvids
6 жыл бұрын
They do have current limiters that should keep the current under the maximum, however because all the LED are in series, all it takes is 1 out of the 38 in this panel that goes south, and everything goes down. Now, sure you could air on the side of caution, and limit it well under the limit, and that may be great, you will never have a failure, but you are also not going to sell any units when the competition set goes brighter in the showroom. In a brightly lit showroom the eye is naturally attracted to the set with the brightest most contrast picture, and it is that showroom where someone makes that decision what to buy. From a manufactures standpoint if it makes it past the warranty they are happy. For the odd one that fails, give them a new one and cut their losses.
@josephbeasley5193
6 жыл бұрын
Ray H what I can't understand is why the damn thing is using a complicated high voltage circuit to drive a simple assed LED which needs only 3v DC
@josephbeasley5193
6 жыл бұрын
Ray H I thought the whole point of led backlight was to simplify and cheapen the backlight design. A CCFL tube needs a driver because florescent tubes require high voltage AC. but it might as well still have CCFL because it got a damn inverter in it. All they had to do was wire the leds in parallel then they could drive then from any of the DC rails in the PSU. No drivers needed
@Hi-Tech-Ray
6 жыл бұрын
Can you say "MFG Conspiracy"? Secondly, I thought it was pretty dumb on Samsung or The MFG of the LCD panel to make those three strips in series to begin with instead of giving each their own B+!
@Hi-Tech-Ray
6 жыл бұрын
I agree when they could simply put in a low voltage supply in place of a HV circuit! IMO I think these boards were originally designed for a ccfl panel which was modified by MFG to go from HV to LV. Kind of either lets use the left over or oops we f'ed up!
@blakecarter7868
4 жыл бұрын
excellent video bud....
@buddywarren3913
5 жыл бұрын
Ok I was hoping I could get some help. I have a 55" Samsung TV model un55fh6030 and the backlighting went dim. When I go to adjust the backlighting it will go to the number 2 and once I turn it to 3 it goes much darker and will increase slightly when I go up on the numbers but it's still very dark at 20, level 2 is the brightest
@buddywarren3913
5 жыл бұрын
It makes me think it's not the LED strips but something with a controller board
@tmho7091
5 жыл бұрын
One more question, my TV also has a dead LED in a string of 5. Can I do the same thing as you? Will it be better if I connect 2 regular LED (in parallel) across that dead one? (2 in parallel is to lower the current passing through the regular LED to make them will not burn out, if just one the current may be too high)
@12voltvids
5 жыл бұрын
Just jump them over. Go into your menu and turn the backlight level down to 75%. This will extend the life of the panel
@tmho7091
5 жыл бұрын
@@12voltvids Thanks for your reply. I follow your advice and fixed it. So far it is working. I am happy.
@Bluethunderboom
6 жыл бұрын
Whenever I got the LED TV set that the panel is cracked (For instance, the 2017 Element ELEFW195), is there a way that I can make one as a ceiling lights to light up the room?
@12voltvids
6 жыл бұрын
Bluethunderboom Tv led are not good as a room light because they fire the light our in a narrow beam. So they will light the ceiling bright but no light down. Plus they need high voltage and need to by mounted on the big metal back for cooling.
@shastrichandoo817
3 ай бұрын
Awesome video sir. I have the same problem with my Samsung tv. I will attempt to fix it and let you know. Look out for an update to this comment....cheers
@davefivey9196
4 жыл бұрын
Well done. Helped me resolve an issue with mine. Thank you for posting.
@de5letras1
4 жыл бұрын
But he broke the white panel 17:40 He is terrible like technician...
@deweyself4508
4 жыл бұрын
Good vedio thanks
@williamsquires3070
6 жыл бұрын
Divide & conquer. Instead of testing every LED, measure continuity from (roughly) the center of the series string to either end; if you get continuity, the bad LED is in the other half, else it’s in that half you just tested. Once you find the bad half, divvy it in two and repeat until you get down to the bad LED; saves time over testing every LED, especially if you have to test a lot of LEDs (or Christmas bulbs, for that matter!) Since it looks like each LED has 3 leads, are these RGB LEDs, or two white LEDs back-to-back? In which case, each strip might be a parallel set of 2 series strings, or maybe a series string of 2-3 parallel white LEDs?
@12voltvids
6 жыл бұрын
William Squires More than likely 2 in each individual chip. As far as measuring half a string, my meter won't put enough voltage across a string to get a reading. In diode test mode there is enough voltage / current to dimly light each lamp. So this is the way to do it. Only takes a few seconds to Pierce the white paint on the board and make connection with the conductor and the good light will light and the bad one will not.
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