I was able to get this working. For those asking questions about lifting pins. No, you do not need to lift any pins. Just be careful and make sure you get things soldered in correctly. I had to go back over my solder joints as one was causing the fans to run high and not power on. Once I re-checked all joints. It powered on and is adjustable up to 14.68v+. Thanks for the fine work and sharing this info.
@edijsj
4 ай бұрын
For my project this solution working perfect. Not tested yet on load's.
@martinargento7088
3 ай бұрын
Hi Tao Li! I was wondering...Could you make a video explaining the control area of this power supply? Well, there's very little info about this and I'm very interested in it. It seems you are a great profesional.
@blankname8553
2 ай бұрын
Is that just a tiny wire between pins 33 and 36? No resistor?
@bensutherland821
5 ай бұрын
hi, thanks for the vid. for pin3 on lm939A and the output did you lift the pins on the ic to connect to them or just leave them in circuit and tag on the back. i don't see you lift them but in the pic they look lifted. thanks
@cholt0225
4 ай бұрын
Nope, do not have to lift any pins.
@rich5291
5 ай бұрын
Hi, thanks for your time and effort detailing this mod. Have done it successfully and getting 14.5V as expected. I'm driving a small PA with only 7A load dropping to zero (or a few mA) when PA switched off and PSU occasionally trips when load is removed - I'm guessing its OVP kicking in - what do you think? Any ideas welcome. TIA.
@taoli1239
5 ай бұрын
Try adding a larger resistor(17.5kOhms) in parallel for OVP1
@rich5291
5 ай бұрын
@@taoli1239 Do you mean in parallel with the 12k or in place of?
@taoli1239
5 ай бұрын
@@rich5291 Replace the 12k resistor
@rich5291
5 ай бұрын
@@taoli1239 Many thanks for quick reply. Have tried that but still getting same problem. Also tried various OVP1 R values but all result in same issue. Also went back to standard 12v to check and that all is OK. Anything else I can check?
@taoli1239
5 ай бұрын
@@rich5291 You're welcome! It's unfortunate that the issue persists. Have you tested other loads to see if they work fine? Additionally, could you provide the resistance values for the three resistors in parallel?
@damianryczek2575
7 ай бұрын
what resistor did you use? 0,25W or 1W? and what is the blue wire for?
@taoli1239
7 ай бұрын
I went with a 1/4W resistor. The blue wire is hooked up to pin 19 of the MCU (PIC16F887) or connected to the resistor marked as 56B.
@goodyfpv2297
4 ай бұрын
@@taoli1239 you wouldn't happen to know how to connect the data cables if I was to have two of these in parallel as they will put out equal power when they're connected with the exact same models?
@Rayenator
4 ай бұрын
I cant get the power supply to provide voltage after installing the resistors. I didnt have a 12k resistor for OVP1 so i put in a 15k in parallel eith the 3.74k resistor. Should it work with the 15k? Also, when OVP kicks in i have to wait over night after removing the resistors to check if the power supply is still operative. If i unplug the power supply wait a few minutes OVP is still active when plugged back in. Is there a way to retest more quickly after a change in resistance is made?
@taoli1239
4 ай бұрын
The range from 12k to 17k is acceptable. This range is influenced by the trimmer settings. Connecting a 12V lamp to the 12V standby output can more quickly drain the energy. My resistor settings might need improvement. If you find a better solution, please report it here. R1~17.8kohms www.wolframalpha.com/input?i=3.74%2F%283.74%2B20%29*12.3%3DR%2F%28R%2B20%29*14.48%2C+R%3DR_1*3.74%2F%28R_1%2B3.74%29
@Rayenator
4 ай бұрын
@@taoli1239I ended up replacing the ovp1 3.74k resistor with a 3k resistor because I lifted the pad. I stuck with the 22k resistor for ovp2 like you have shown in the video. For the output I put a 33k ohm resistor in parallel with R110, the 5k1 resistor, leading to pin 3 of the 2N7002 mosfet. This gave me 13.4 to 14v range using the varistor. Perfect for vehicle programming. A few notes. I thought that if the LED in the back of the power supply did not turn on that the power supply was not putting out voltage. This is wrong. Eventually found out that I get power even if the LED isn't on. The bulb from pin 37 to ground was very helpful to drain the power supply and reset the ovp. Thank you for the instructive video, helpful wiring diagram on your github, and the response to get me up and going. It's very much appreciated.
@MrJoki007
5 ай бұрын
Mine was working with 14,4V So i used hot glue, that my soldered wires dont move. Then i reassembled it and it does not work anymore. Then i removed everything i soldered in but it that does not help. I measured with a oscilloscope, and the voltage rises up to about 10V and then it shuts down again Do you have a clue, what could be wrong? Thanks
@taoli1239
5 ай бұрын
I suspect resistor contact issues, carefully inspect the components around the soldered area. Check for loose or damaged components. If there are any components that were moved during the reassembly, make sure they are properly seated and secured. Ensure that the resistor pins are correctly connected, and check for any issues with the solder joints. Re-examine the resistors you soldered to see if there are cold solder joints or short circuits.
@dandavis8871
6 ай бұрын
I didn’t know how else to get a hold of you. I have a HSTNS-PD43, 1400 W. I was wondering if you had any mods for it or could you figure out the mod and post it?
@dandavis8871
6 ай бұрын
Or even maybe an explanation about the mod and why it’s being done that way it’d be nice to figure out actually why a person is jumping this to that
@taoli1239
5 ай бұрын
@@dandavis8871 If you're looking to modify your HSTNS-PD43 power supply, there are KZitem tutorials available from other creators. Check them out for guidance. If you run into any problems, feel free to shoot me an email, and I'll help out.
@phr3ui559
4 ай бұрын
@@dandavis8871did you mod it
@artfess
6 ай бұрын
Hello, any tips on what to do to have around 14V and under load 13.8V? Need it for safe flash of firmware on a BMW
@taoli1239
6 ай бұрын
OVP1: 22K, OVP2: 28K, OUTPUT: 28K
@artfess
6 ай бұрын
@@taoli1239 thank you very much
@Mario-zb1yc
4 ай бұрын
Thank you
@andrebr0212
2 ай бұрын
What type of resistor? 0.25w or higher?
@andrebr0212
2 ай бұрын
@taoli1239 can't find 28k. Only 27k and 33k. Also programming bmw. Does these work?
@R5DF
2 ай бұрын
Hello Tao Li. There is a very interesting power supply HSTNS-PD44, it has an 80+Titanium certificate. This is a very efficient power supply with minimal audio noise and radio noise. But I could not convert it to 14 volts to power radio equipment. Can you help? I collected the photo in a Word file, but I can’t attach a link to Google Drive here( I was able to remake the PL40 and PL41 (80+Platinum), I have a video on my channel.
@goodyfpv2297
4 ай бұрын
I tried this now My power supply doesn't turn on I get 8 V and it shuts down. Even after removing the resistors, still the same problem.
@karolp1993
28 күн бұрын
The same.. Did you manage to solve the issue? EDIT: In my case, resistor from MCU P19 was damaged, my fault.
@YOUberser
7 ай бұрын
I have modded the exact same psu following your steps. Works fine for around 2-3 mins (30-40A 14v) and then psu enter in failsafe mode. Fan runs very slow always and led doesnt light up. Any hints please? Thank you!
@taoli1239
7 ай бұрын
Test the PSU in its original, unmodified state to see if it works under the same load conditions. The OVP1 might be sensitive and triggering UVP(Under Voltage Protection), so try adjusting the resistor for OVP1 to achieve a voltage division close to the original, around 1.94V(3.74/(3.74+20)*12.3). After your modifications, the new voltage division is roughly 1.53V (V_1 = R/(R+20)*14, R = 12*3.74/(12+3.74)). Consider adding a larger resistor in parallel, maybe around 22K(V_1=R/(R+20)*14=1.93V, R=22*3.74/(22+3.74)), to address this. This might help prevent the failsafe mode from kicking in.
@HSRA-hg9gc
6 ай бұрын
@@taoli1239 The OVP can be shut off by cutting pin 9 on the chip. 8B35 1002DS
@taoli1239
6 ай бұрын
@@HSRA-hg9gc May I ask for the name and location of this chip?
@HSRA-hg9gc
6 ай бұрын
@@taoli1239 It's on the main board, number: 8B35 1002DS
@taoli1239
5 ай бұрын
@@HSRA-hg9gc I couldn't find the chip.
@jesusguadalupellanessagast7384
6 ай бұрын
good day. Hey, I have a HP DPS-1200FB-1 A power supply. Do you know how I can increase the voltage to 14vlt?
@HSRA-hg9gc
6 ай бұрын
I used all variable resistors, and disabled the OVP.
@eArtrash
4 күн бұрын
@@HSRA-hg9gcif you don't mind me asking, What size of variable resistors did you use?
@dandavis8871
7 ай бұрын
Where does the blue wire go?
@taoli1239
7 ай бұрын
The blue wire is hooked up to pin 19 of the MCU (PIC16F887) or connected to the resistor marked as 56B.
@dandavis8871
7 ай бұрын
@@taoli1239 would you by any chance have some pictures?
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