Thank you! Gives me some more ideas. Shout out from Coos County!
@Xandersgrampa
7 жыл бұрын
Way above my skill level but I'm always happy to meet a person that knows more than me.
@GrantsPassTVRepair
7 жыл бұрын
I try to keep it simple so anyone can follow along, but perhaps I can do a little better.
@dariusn9529
8 жыл бұрын
Very very helpful , thank u , hope u get time to make some more videos soon , I enjoy watching them
@madisonelectronic
9 жыл бұрын
Have any idea how I can force yt to put up your newest videos? I go out of town and upon returning yt seems to "retire" subscriptions to the back burner. I imagine just finding and watching a few is the only way.
@GrantsPassTVRepair
9 жыл бұрын
madisonelectronic I put an index to all my youtube videos at www.tvrepairinfo.com/
@Pongzkie1974
3 жыл бұрын
I have a digital ESR meter but I never know I could used it in other way just like what you did in this video. Thanks for sparing some time to share us your skills sir.
@glenwhatley4125
6 жыл бұрын
Also, if the short is low enough resistance, you can likewise inject a voltage of much less than the voltage than the power supply and boost the current output until the shorted component heats up enough to actually feel with your finger (no using expensive freeze spray. I work repairing cable boxes for Comcast and have been able to repair a very high percentage of boxes this way. I Have used the milli ohm method as well as the ESR Meter as well as injecting voltage and tracing with the milli volt meter, too. All have their place and merit. With Shorted chip components on a highly concentrated board with as many as 10 decoupling chip caps on a power supply line all across the PCb, it could be anywhere on the entire board. Hands down the injecting low voltage at higher current and merely feeling for heat is the most effective. I haven't had one case in hundreds of repairs where I have ever damaged the upstream or downstream components. This is mostly with buck supplies.
@hullinstruments
4 жыл бұрын
Thanks for this information. I would imagine a cheap thermal camera would help this process? I’ve had my eye on the “flir one pro” for a while now. at $400 I think it would be invaluable on the electronics bench, in automotive repair, even checking the HVAC/energy leaks in your home. A friend of mine has a cheaper model… And it immediately identified the bad wheelbearings on my vehicle in broad daylight because they were warmer than everything else. The flir one pro is pretty much the minimum priced thermal camera and resolution that one would want for electronics. Sure the $100 models work fine... but to really get down and see the smallest SMD packages and such… I think $400 is worth the extra price.
@hullinstruments
4 жыл бұрын
mister kluge Thanks a ton for the info! They’ve tried so many different terminal cameras… Are you referring to the “seek“ thermal camera? I know they’ve showed a few very nice thermal cameras but they are out of my price range. Closer to $1000....Where the flir one pro phone attachment is only about 400. And with a macro lens added… Can REALLLYYYYYY see tiny parts even the smallest SMD components clear as day. and the diy macro attachment is only a few dollars. AND makes small components 10 times clearer! Thanks for your time!
@mikeg1433
4 жыл бұрын
HULL GUITARS USA Did you end up getting the camera yet by chance? In a total novice with this stuff but I end up doing it often enough to make 400$ worth it, especially if it works for other applications. HVAC, home electrical, and car maintenance alone would justify it if it’s useable on a larger scale. I’d imagine it is, if it’s able to pick up the much higher resolution of electronics.
@violentrobot
4 жыл бұрын
@@hullinstruments how about one of those cheap laser temperature guns? you could do the same thing with the low-volts high-current and scan the components. and those are like 30 bucks
@RichardsWorld
4 жыл бұрын
And you don't buy a Flir because????
@Stelios.Posantzis
4 жыл бұрын
So simple yet so brilliant! Thanks for sharing.
@jessstuart7495
7 жыл бұрын
You need to know something about the trace geometry to accurately pinpoint the short using this method. You need to measure the voltage drops across the traces. I start by connecting the negative lead of the DMM (mV mode) to the point where the current source's negative terminal connects to the PCB. Then begin probing further from negative connection point until the voltage stops increasing. As long as the voltage continues to increase, you are following the flow of current. As soon as it stops increasing and levels off, you've passed the short. If you have a layout viewer, it really helps. Using this technique with boards that have power planes is more difficult. You'll need a high precision DMM to measure micro-volts of change on top of the millivolt voltage that is actually across the shorted component. You may need 6-digits of precision to do this. The relative (delta) button won't help because the meter will use the appropriate scale for the total voltage ("trace voltage drop" + "shorted component voltage drop"). You are only interested in the trace voltage drop. I suggest using a good cad viewer that allows you to highlight nets and has coordinates so you can calculate distance. I've used this technique to get me within about 1/2 inch of a shorted cap between Vcc and Gnd on boards with hundreds of bypass caps on them. I also use thermal LCD paper and cold spray to try to locate the shorted part thermally.
@atifservicecenter
2 жыл бұрын
In India, we mostly use rosin paste and 3.3v with few good range of amps (current) and volts depends to the supply line or supply track. And we easily find the shorting component. There are many ways to locate the shorting component and those are effective too.
@mikep95133
8 жыл бұрын
Excellent way to find shorts !! I had one in my house wiring that I found with your method. Thanks !!!
@SWTWHITEGSR
2 жыл бұрын
I was just searching to see how to put a multimeter to millivolts and seen this video. I finally see how diode measured to find if they aren’t working. Video is beyond excellent.
@peterlethbridge7859
Жыл бұрын
Thank you. Very helpful information.
@g0fvt
7 жыл бұрын
This technique works very well, great on logic circuits were the 5v rail might go everywhere.
@walker55able
Жыл бұрын
Thank you i have been trying to do a similar check with sm caps in parallel☺
@electronicartis
Жыл бұрын
A thermal camera would have being really nice
@electronicengineer
2 жыл бұрын
Excellent information! Thank you for sharing your knowledge with all of us! Fred
@fins59
6 жыл бұрын
I've learnt something from you every video I've watched, thank you.
@BJcanal270
8 ай бұрын
Thanks for sharing your knowledge
@ciprianwinerElectronicManiac
9 жыл бұрын
Thanks very much for sharing. I too use my ESR meter for finding shorts but you've intrigued me with the short sniffer that I saw it costs quite an insane amount of money. 10 minutes later, I have one up and working just great, it's just a prototype of course but more or less I made myself and idea of what values of components I have to use. If you need any help, just ask. Cheers :)
@yugimkl6938
6 ай бұрын
Tap on a clip to paste it in the text box.
@zaprodk
9 жыл бұрын
Usually to find shorts of that kind, i usually plug a lab supply across the shorted rail and inject some power and look for the hot parts.
@GrantsPassTVRepair
9 жыл бұрын
***** I've used the same technique, but sometimes it takes quite a bit of current to get the component to warm up.
@Skipperj
5 жыл бұрын
Thanks much Grant you remind me of my uncle who had the 1st TV repair shop in the north Adirondacks.That was circa 1950? He was a communications guy in the Marines on Okinawa ww2
@IsaacOLEG
3 жыл бұрын
Yes it helped, Thank you so much
@MrMac5150
9 жыл бұрын
Very good teacher.
@GrantsPassTVRepair
9 жыл бұрын
MrMac5150 Thanks.
@MrMac5150
9 жыл бұрын
send some more of your skills this way.
@christianfraude4517
8 жыл бұрын
Thanx for the video very useful & educational !!! Keep them rolling my friend
@keithking1985
4 жыл бұрын
I just watched a video by a guy called "creative Lua" and he has a cool little circuit with a LM317 a 10 turn pot and resistor, oh and a small cap. but it allow's you to turn you meter into a milliohm meter. CHECK IT OUT IF THIS INTERESTS YOU "CREATIVE LUA" IS THE CHANNEL, HE'S A GUY FROM CHINA BUT IT HAS ENGLISH SUBTITLES WITH THE CAPTIONS TURNED ON. BUT HE GOES OVER EACH STEP IN MAKING IT VERY WELL AND GIVES YOU A SCHEMATIC AND DEMO ETC!! HOPE THIS HELPS SOME OF YOU WHO LIKE THIS VIDEO LIKE I HAVE....
@jorge195501
8 ай бұрын
Thank you for a good video!
@jlucasound
8 жыл бұрын
Great video, thanks! There's a potential (little) goldmine out there if you can get the "throwaways" before the "scrappers". And if they are repairable. I bet most are.
@Skipperj
5 жыл бұрын
I like the ones with broken screens, if they come on ther usually some fairly good boards inside.Sometimes it's deceiving.
@jaynone9262
4 жыл бұрын
Got that trick from (How to diagnose and Fix everything electronic) by Michael Jay Geier.
@miguelangelsimonfernandez5498
8 жыл бұрын
The ESR meter should be enough to find the culprit. Indeed a must have tool
@morphman86
8 жыл бұрын
I'm not sure I understand what you're looking for... Every measure you did had different values for different diodes. You KNOW one of the diodes is bad in this case, but the only indication you have for which one it is would be the one with the lowest value in whatever measurement you're doing. But if you don't know if it's a diode or a capacitor (or any other component, for that matter) that is the culprit, how would this help you? You haven't really located the short, because to even use the technique, you must know which component type you're looking for. And even then, it only works if all of the components of that type in the circuit has the same value. And even then, you can get "false positives" because of the natural difference in the readings.
@GrantsPassTVRepair
8 жыл бұрын
This procedure is designed to help you find a shorted component where there are multiple components which share the same power supply output. it's not going to tell you if a diode, capacitor, IC, or transistor is open, but if one of these components is shorted such as a diode it will have the lowest voltage drop of all the components you test. I hope this helps.
@kite7214
2 жыл бұрын
Dave, I was hoping to see a really informative video, but you spoilt it by having it all OUT OF FOCUS. Also, I need to read your multimeter setting position and you had an elestic bungee across the selector knob obscuring the view. What a shame. Keith 😞
@peterduxbury927
5 жыл бұрын
Short-Circuits (in their natural state) on PCB's have already done the damage to the equipment! I am an amateur (self-taught over 50 years). I can say that Grants Pass TV repairs have taught me that you can check out 'shorts' by the use of a DMM on the milivolt scale. I have followed the same procedure as shown in this video, and that is - to first determine WHICH CIRCUIT BOARD is faulty. Sometimes, there are five or six separate PCBs in a Home Theatre System. Narrow down the fault to just one specific PCB. Write down every step that you take! Magnification of the PCB and its' components is a must! Look for the obvious first. I do this by powering-up the suspect PCB independently, with the same voltage / current that is rated for the particular Board. I will not reduce the voltage (or current), because a 'short' is present. Remember that the Board cannot suffer more damage! At this point (when the suspect Board has been disconnected from ALL other Boards and Feeds), the 'short' begins to show itself........... Yes, components (even the printed copper track) will get warmer than others, because many other parts of the circuit are not being fed with their correct voltage - due to the 'short'. Have a smoke, have a coffee - but leave the suspect Board powered for 5 minutes. THEN, pinpoint every component such as diodes, capacitors, resistors, voltage regulators and transistors etc WITH A LASER BEAM. I am talking about the (very cheap) Hand Held Laser Pyrometer. The Laser Pyrometer detects the smallest amounts of heat (from or near to the shorted component), and you will definitely see results! As an amateur, I have had many hours of frustration and heartache in trying to detect a 'short'. I have no idea why all of the professionals have never mentioned this method of heat detection on You Tube. In many cases, it isn't possible to detect small amounts of heat with the human hand - from many components that have radically shrunk in size - and mass - from two or three decades ago. If I was a professional Electronics Technician, a Laser Pyrometer would be a very important part of my arsenal. Thanks to Grants Pass for a great Tutorial. Greetings from Australia.
@OmluTerong
Жыл бұрын
Finally.....thank you SIr
@rogerkerr5745
9 жыл бұрын
another excellent video. although in my experience finding a short to ground is a lot tougher than you have shown especially if you have a bunch of smt noise caps or the short is between layers.
@GrantsPassTVRepair
9 жыл бұрын
Roger Kerr I agree. Finding shorted diodes and large transistors is fairly simple in comparison to what you describe.
@tonytrilex2555
3 жыл бұрын
You can use a Seek Pro thermal imaging camera to see what heats up the most to find it fast too!
@Heathmcdonald
3 жыл бұрын
91% IPA (isopropynol aka isopropyl alcohol)pour on suspect components then inject voltage and you will know what is shorted by how quickly it evaporates. Much cheaper than thermal cameras
@stevenbedoya9920
3 жыл бұрын
@@Heathmcdonald That's the way to go!
@rogerkerr5745
9 жыл бұрын
nice tipoff about the audio frequency of switching power supplies
@SevenDeMagnus
Жыл бұрын
New subscriber here.
@andrew_koala2974
3 жыл бұрын
One can also pour some Butane on the suspect component. The S/C will obviously generate some heat, which in turn will cause the Butane to evaporate (boil) at a rapid rate in comparison to the normally operating components. Of course a Power supply is used for the power source as described in this video. The Current (I) may have to be increased to 5A so that enough heat is generated, As the S?C component is already defective 5A will not be of a concern, and power rail components are quite durable for obvious reasons. For those just learning, it is important to understand how Power rails work, and how lower voltages are derived from the source power rail(s) Not knowing that would be chasing one's own tail and wasting time. Good luck everyone.
@t1d100
Жыл бұрын
Good info. Thank you.
@MasterofCrude
Жыл бұрын
NICE . ThanX !!!
@klaasklapsigaar1081
4 жыл бұрын
This was really helpfull, thank you.
@omarkhaledk11
3 жыл бұрын
Thank you so much. unfortunately, my bench power supply doesn't control current that accurately so I created a simple constant current supply circuit that I use now for this method.
@jacka.4774
3 жыл бұрын
this is nice. thank you. I been back to watch this video several time. I also have the toneohm, which, I am in the process of making my own leads since its leads are crazy expensive, I am yet to learn how to use it though.. but I have found using a good thermal camera, though expensive but is a very effecting and fast way in finding shorts. I would call thermal camera, short finder for dummies.
@ditlofj3280
2 жыл бұрын
Great video
@Tadju50
8 жыл бұрын
Nice job. I'm working on a small board with a short somewhere. I'm going to apply a small voltage (3 D batteries, 4.5v) with a small current limiting resistor and try to get closest to the short with digital voltmeter readings OR allow more current and feel for a hot component.
@Richie_
3 жыл бұрын
I'm just getting into electronics learning Arduino and this video is helpful.
@maxwarfield6699
3 жыл бұрын
Complete NOOB here. Great video BUT, it seems to me like it’s like many others, in that, it assumes that you have, a general idea of where the shorted component might be. I haven’t found ANY videos, which actually explains how to determine where a short might be, or for that matter, IF what you are dealing with, is actually a short. I mean, every electronic failure isn’t ONLY a short. It could be an opened component, or a non-oscillating crystal, etc, etc. What if the device you are are trying to fix, shows no signs of damage, or burns/darkened areas on the pcb, what do you do then? You can’t just assume, that it’s a short. Sometimes, the issue can be something simple, that you just overlooked OR a super difficult one to figure out, and what/how do you start then? What/where do you start, when the device you are going to work on, shows no damaged components or pcb? That’s the kind of video, I would like to see.
@GrantsPassTVRepair
3 жыл бұрын
You may find this video helpful. kzitem.info/news/bejne/0qWqqGWusYOgn6g
@willywgb
9 жыл бұрын
Hi Dave Another great Video. Thank you for taking the time to show us your troubleshooting tricks. Keep up the great work you are doing. Cheers Willy
@johncunningham5435
8 жыл бұрын
Great idea for locating shorts to ground; in fact you have given me an idea that I want to try out when I come across this situation again.
@darrenchan8413
4 жыл бұрын
This technique seems similar to 4-wire resistance measurement. Very ingenious application for repair!
@rickpontificates3406
3 жыл бұрын
The best short detecter for the circuit you’ve shown is your finger.
@ohmedarick1
7 жыл бұрын
Thanks for taking the time and effort. well explained.
@brig.4398
7 жыл бұрын
ESR meter can also read very small value resistors.
@robertcalkjr.8325
9 жыл бұрын
Thanks Dave. I appreciate the video.
@MrRasZee
3 жыл бұрын
this is a great way to find bad connections on car battery leads
@hahyonhwatha
7 жыл бұрын
I'm a retired avionics tech. 30 years ago HP published a trick not unlike your own, using the mv on the DVM, but with no guessing. To find the short connect a current limited supply to the shorted supply rail at the spec voltage but with a safe current limit. Now connect the positive lead to the rail, and we'll use the neg probe to chase down the short. Clearly the millivoltage will grow towards the short, and if you probe past a node, the voltage will stop increasing.
@GrantsPassTVRepair
7 жыл бұрын
I'm not to surprised. Unless you own a low ohm meter capable of 1000 divisions it's a great option.
@RickNickel
5 жыл бұрын
That's how I used to find shorts until I got a $200 FLIR that connects to my phone. Now one of the first things I do is take pictures of the board temperature signature when I first power up the item. Sometimes it pinpoints the problem without any troubleshooting.
@mchaves7663
5 жыл бұрын
@@RickNickel hi Rick would you post a link to this?
@jettramel
4 жыл бұрын
@@RickNickel Looking at one today for the same purpose.
@tonytrilex2555
3 жыл бұрын
it kinda like the opposite of what he is doing very smart!!!
@looy1234
7 жыл бұрын
Actually, there is one thing here VERY WRONG. Measuring with current is ok, but 0.25A is TOO MUCH - that could've fried your diodes! Most diodes work on currents around 20mA (LED diodes for example) and that is a level you should have. In this example you where lucky that the diodes you had there where power diodes, but on laptop motherboards and elsewhere, the diodes are much more sensitive and they can get fried with as low current as 50mA. Of course, a short to the ground means that the power will go through the short and not through the diodes, but once the short is gone, all that power would go to those diodes. Another safe thing (except limiting current) would be to try to find the short by limiting the voltage to 0.25 V - at this voltage most of the diodes just don't work and no harm will happen to them even if the short will be eliminated. At 0.25V only thing that works is passive components (and shorts) - and those can handle that voltage no problem, so you don't have to limit the current so much when you are at 0.25V.
@GrantsPassTVRepair
7 жыл бұрын
Yes there are some components such as LEDs that can easily be damaged with 0.25 of an amp, but If you insert a low voltage directly across one of the electrolytic capacitors on the circuit trace in question, and apply the correct polarity your not likely to damage anything. Especially when you consider there is already a short dragging your voltage way down below normal operating voltages. If I see an electrolytic capacitor on the circuit trace I'm testing with a working voltage printed on the side, I think it's fair to assume I can safely apply 10 percent of that voltage and probably much more without causing any additional problems. Even if the short were to open, as long as you don't exceed the normal operating voltage of the circuit and you apply the correct polarity it should be fine.
@fullwaverecked
5 жыл бұрын
@@GrantsPassTVRepair the short acts like a dim bulb device?
@GrantsPassTVRepair
5 жыл бұрын
The short is preventing your power supply output from passing through the circuit it's intended to pass through. @@fullwaverecked
@rotlerin
9 жыл бұрын
Excellent Dave.
@omgffsification
9 жыл бұрын
Gustav Kirchhoff would turn in his grave if he saw this video...... Those components are in parallel , the voltage drop across the components will be identical as you are measuring rail to rail. They will be passing different currents depending on their resistance but the voltage drop across the rails will be the same no matter where you measure. The more sensitive you make your meter readings, the more you will think that a few millivolts here or there mean something when they actually dont.. There is a reason why components in parallel need to be unsoldered to check, and this is a good lesson in why.
@GrantsPassTVRepair
9 жыл бұрын
omgffsification Technically speaking the only voltage drop you really see in this example is from the shorted diode. The other diodes direction are not in the conduct mode, and capacitors do not pass DC. I should have used slightly different words to describe this example.
@omgffsification
9 жыл бұрын
Grants Pass TV Repair Sure but how is this test telling you which diode is shorted?
@GrantsPassTVRepair
9 жыл бұрын
When diodes go bad they generally short out and their resistance goes down as the diode junctions become fused together. This test is showing me which diode has the lowest resistance reading within a few thousandths of an ohm.
@CHIBA280CRV
9 жыл бұрын
Thank you , great tip!
@semaisamir2050
6 жыл бұрын
Big thanks for these very powerfull techniques, voltage drop is really revealing
@GrantsPassTVRepair
6 жыл бұрын
I'm glad you found this technique helpful. Thanks for the comment.
@kevsmith5363
Жыл бұрын
very good most helpfull tip haow can you check for a winding short in a transformer do you have to use a micro ohm meter and know what a good one would read?
@GrantsPassTVRepair
Жыл бұрын
I do have a micro ohm meter, but when I test the primary side of a transformer I often use the my blue ring coil tester. Here is video on how they work. kzitem.info/news/bejne/rK9oumVjp5F3nqg
@cosmo0080
2 жыл бұрын
hi, is there a difference between a bad diode and a shortened diode when checked with a meter what i am asking would a shortened diode measure as bad with a meter ? thank you
@GrantsPassTVRepair
2 жыл бұрын
I don't quite understand your question, but I think you meant to say shorted diode rather than shortened diode. ;-). When the short out they generally become like a piece of wire with almost no measurable resistance. Less than 1 ohm.
@eman59461
3 жыл бұрын
I have short killer pro HR1520
@StrawberryGates
6 жыл бұрын
Not sure you should be touching all the components like that. You obviously know what you're doing, but your viewers may not... Freely and carelessly touching live capacitors will end up getting someone hurt.
@GREGGRCO
Жыл бұрын
Great video !! And tips in the comments! When I first stared out in my 20's, my boss had a Weston 7 digit ohm meter to find shorts on boards. Boy did that work like a Champ ! 35 years later, I see this great idea using the mV meter approach !! Especially the HP concept in the comments !! I'm so grateful and embarrased I didn't think of it ! This concept in this video should get an award ! Thanks again for making this video and bringing out further comments here with further tips !
@rectify2003
3 жыл бұрын
Your really good at explaining
@envisionelectronics
Жыл бұрын
The noise is caused by pulse skipping. Even a minimum pulse width PWM will be inaudible because the switching frequency doesn’t change.
@haze42082
9 жыл бұрын
excellent, thank you for sharing your hard earned knowledge, much respect!
@teamiceboxable
4 жыл бұрын
Very useful. Thank you.
@m.m.m.c.a.k.e
Жыл бұрын
The $1 diy diode tester is the bees knees
@maxwarfield6699
3 жыл бұрын
Great way to test for shorted components BUT that's IF you have more than one of the same component [with which to compare it with - like three similar values diodes]. But how can this work, when the components are of different values to each other AND altogether different components? Ex: a transistor, a cap [tear shaped - tantalum], an electrolytic cap, few resistors and maybe a diode. What can you possibly achieve test-wise with this method [ESR meter]? You would never be able to find the shorted component. But I have so much more to learn about electronics [I'm a complete NOOB in this field] so, PLEASE correct me if I'm wrong - I truly am trying to learn. Your videos have been a great source of education for me. Thank you kindly.
@qzorn4440
2 жыл бұрын
very interesting info.🥳 i use fluke equipment, however i also have some wonderful hobby equipment that i go to 1st. 😊🧐 thanks a lot. 🤩
@mango3586
8 жыл бұрын
thank you nicely explained.
@schabanow
7 жыл бұрын
Hey, you can just supply this troubled PCB not with ordinary high input voltage but with low voltage and high current capability power supply. And just use your fingertip to locate a shorted component(s) by its temperature. )) Any advanced multimeter needed, but ATC 300W power supply in tact is strongly recommended to have in your workbench.
@temporaryscars
Жыл бұрын
Well that's great if you short is because of a bad diode. What do you do if it's NOT a diode?
@GrantsPassTVRepair
Жыл бұрын
If it's a shorted part other than a diode, the same technique can apply, but unless you have a schematic, or a pinout of the part, it can be more challenging to isolate which part or parts have gone bad, When transistors go bad their terminals often short out between them, so using an ohm meter can also help you isolate the problem by looking for shorts between the transistor terminals. Having a schematic can help you understand what's likely to be a shorted part if you measure a low resistance path to ground on a component terminal that should show an open relative to ground of your power supply, and learning to read schematics can be a time saver if you happen to have one for the device you're trying to repair, and knowing which parts are more likely to fail can also be helpful. The parts which mostly commonly fail are diodes, transistors and ICs. It's been my experiences that electrolytic capacitors rarely short out, but sometimes the small surface mounted capacitors are known to short out.
@temporaryscars
Жыл бұрын
That's exactly my problem. I have a short on the board I'm working on, but I suspect the issue is a ymf292f sound chip, for which I can't find a schematic or a replacement! Thanks for the response.@@GrantsPassTVRepair
@jerryanstey7058
3 жыл бұрын
There could be 1000000000s of aliens zooming around us at high inaudible frequency !
@jackdenton4598
9 жыл бұрын
Mitsubishi #WS-5561 Turns off then can turn on again may work for ??? time. Then turn off again. No green blinking.
@rsattahip
7 жыл бұрын
The old way worked better; you're going to want to change all the rectifiers and capacitors anyway. What is it, about $5 worth of parts?
@iL_Sol
7 жыл бұрын
Thanks. But quality video - i broken my yeys, change camera pls
@kamranjavaid
4 жыл бұрын
I think this is the most professional method to isolate the shorted component. I want to know about if this method can be applied to computer boards. If possible, can u make some video on that?
@dotcomlist2479
3 жыл бұрын
Thank You very very much sir this works excellently,
@diydantex6150
Жыл бұрын
Thank you very much
@davecc0000
9 жыл бұрын
Another great education. Thanks! 11:03, *smaller* voltage drop. I know you knew that... (c:
@surgingcircuits6955
Жыл бұрын
What a fantastic video! Over my self-educated time spent (100's and 100's of videos and some books), what no one ever said/wrote was that in repairing electronics, it all comes down to OPENs and SHORTs; with SHORTS being the "variable" cause ... meaning that there can be a SHORT ...or... a PARTIAL SHORT that's causing the problem. Once that became apparent, troubleshooting changed to "much easier" to diagnose. I have a Zapper, built a LeakSeeker, have injected voltage, and and and. This video from 7yrs ago ... I wished I had discovered earlier. It added a very valuable approach ... inject a small voltage and then look for a voltage drop in the mA's (or maybe even uA's if you can). Brilliant. Thanks for this video.
@GrantsPassTVRepair
Жыл бұрын
Thank you for the comment. It's always nice to hear when someone appreciates on of my videos. We had a period where bad capacitors kept repairmen fairly busy due to a manufacture error known as the "capacitor plague", but that's not so common anymore, so other than bad eeproms and leaky parts, I suppose shorts and opens do make up the bulk of repairs. All the best.
@RossDuClair
7 жыл бұрын
Well done. I have not used this technique, but you can bet that I will.
@vaniz2012
7 жыл бұрын
how value voltage and current to charge? for not damage the other component
@ryanleslie7425
7 жыл бұрын
Thanks! helped me find the needle in a haystack.. bad SMT cap
@lakhvirsingh6994
5 жыл бұрын
My multimeter's R5 has blown
@ittakir
4 жыл бұрын
I fixed my MacBook Air with this method. It had shorted component somewhere on the main power rail to ground. Supposedly, capacitor. But which one of many (about 100)? I put about 0.5V 1A to the board and then started to measure all capacitors to find one with the least voltage on it (because it will be the shorted one). And I found it! With simple cheap multimeter and power supply.
@gliterr16
2 жыл бұрын
Thank you!
@johnmarch5969
3 жыл бұрын
Very helpful video! Thank you!
@waynewayne3709
4 жыл бұрын
Seen a lot of this kind of psu fault... I just desolder the doides and check... These types are 5a diodes..
@GrantsPassTVRepair
4 жыл бұрын
That's One of many ways to do it.
@gandalf87264
7 жыл бұрын
Thanks for this great video. I learned something new today. It just happens that I have an incredibly expensive board that has a short on it's power bus. I am dying to try out this new method of tracing it. Please let it not be the CPU, because then it's fucked.
@WellWisdom.
3 жыл бұрын
Thanks!
@LeckieInstallsLondon
7 жыл бұрын
seems like way more work than just to take your chances and start snipping a few anode leads until your short is gone. then a dab of solder to reconnect the innocent components
@GrantsPassTVRepair
7 жыл бұрын
Clipping leads or un-soldering multiple diodes sounds far more labor intensive than a few quick probes with a low ohm meter,
@mashhoodahmad96
4 жыл бұрын
super video , congratulations
@chilmaramon8901
3 жыл бұрын
Nice
@frekleet
9 жыл бұрын
very informative , thank you sir
@blackline67
8 жыл бұрын
whats the type of the "paper" that connects resistors you use for simulation? thank you!
@challenger2ultralightadventure
7 жыл бұрын
Adhesive copper tape. Available everywhere, here is a link to one site that sells it, there are other sites, or outlets in your country as well. www.sparkfun.com/products/10561
Пікірлер: 244