Thank you for the instructional video. I wanted about 13.7 V for car programming so I used a 22K for OVP1 and 33K for both OVP2 and Output. Gave me a range of 13.5 to 14.0 volts adjusting VR600 (4th pot from the left).
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.
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.
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
I soldered both 22k resistors and 12k to pin 19. However, the power supply still has a 12.23v on the output, and when pin 19 is connected to 12k to ground, it will not power on? Any idea on why? I checked and double-checked all my soldering points.
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 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?
@@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?
@@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?
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
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.
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!
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.
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 If you're looking to modify your HSTNS-PD43 power supply, there are TH-cam 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.
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?
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
@@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.
you replaced the "56B" resistor from OVP1 to a 3K resistor? Thats it for OVP1 or did you also use the 12k (or 15K) resistor for OVP1 as shown in the video? I dont understand the part with the 33k ohm resistor in Parallel with r110?! For the output voltage you only connect a 33k ohm resistor in parallel with the r110 5k1 resistor? thats it for the output voltage level? Did you left out the solution in the video with the 22k resistor for the output voltage? Which varistor do you turn to varify the voltage between 13.4 and 14v? The second one count from the right side?
@@TheHunter0077 I made a mistake on OVP1 by damaging the resistor. That is why I used a 3k instead of the 12k they suggest in this video. So yes, I replaced the 56B resister and used a 3k. Either method should work. Their method just puts two resistors in parallel. Use this diagram to see what I mean by putting a 33k ohm resistor in parallel with R110. I turn the varistor closest to r110 to adjust the voltage. It's been a while, but i think its the 3rd one counting from left to right. It's the one closest to the 22k resistor they install.
I am looking for 14.75V (300A) to parallel a few to run a hi power Communication Amplifier , can i get that voltage with your value resistors ? Or should i change values ? Any info appreciated.....
Great info.....i see one end of your resistor from the MCU seems like it's soldered on to a blue wire, did you use the wire to attach to pin 19 on that square IC ?.......i find it hardly got any room to solder anything there
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.
Thank you for the instructional video. I wanted about 13.7 V for car programming so I used a 22K for OVP1 and 33K for both OVP2 and Output. Gave me a range of 13.5 to 14.0 volts adjusting VR600 (4th pot from the left).
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.
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.
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
Nope, do not have to lift any pins.
For my project this solution working perfect. Not tested yet on load's.
I soldered both 22k resistors and 12k to pin 19. However, the power supply still has a 12.23v on the output, and when pin 19 is connected to 12k to ground, it will not power on? Any idea on why? I checked and double-checked all my soldering points.
Is that just a tiny wire between pins 33 and 36? No resistor?
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.
Try adding a larger resistor(17.5kOhms) in parallel for OVP1
@@taoli1239 Do you mean in parallel with the 12k or in place of?
@@rich5291 Replace the 12k resistor
@@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?
@@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?
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
OVP1: 22K, OVP2: 28K, OUTPUT: 28K
@@taoli1239 thank you very much
Thank you
What type of resistor? 0.25w or higher?
@taoli1239 can't find 28k. Only 27k and 33k. Also programming bmw. Does these work?
what resistor did you use? 0,25W or 1W? and what is the blue wire for?
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.
@@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?
@@taoli1239 Is 56B under resister 30C?
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
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.
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!
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.
@@taoli1239 The OVP can be shut off by cutting pin 9 on the chip. 8B35
1002DS
@@HSRA-hg9gc May I ask for the name and location of this chip?
@@taoli1239 It's on the main board, number: 8B35
1002DS
@@HSRA-hg9gc I couldn't find the chip.
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?
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
@@dandavis8871 If you're looking to modify your HSTNS-PD43 power supply, there are TH-cam 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.
@@dandavis8871did you mod it
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?
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
@@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.
@@Rayenator can you share these mod in details please? a few pics would be fine ;)
you replaced the "56B" resistor from OVP1 to a 3K resistor? Thats it for OVP1 or did you also use the 12k (or 15K) resistor for OVP1 as shown in the video? I dont understand the part with the 33k ohm resistor in Parallel with r110?! For the output voltage you only connect a 33k ohm resistor in parallel with the r110 5k1 resistor? thats it for the output voltage level? Did you left out the solution in the video with the 22k resistor for the output voltage? Which varistor do you turn to varify the voltage between 13.4 and 14v? The second one count from the right side?
@@TheHunter0077 I made a mistake on OVP1 by damaging the resistor. That is why I used a 3k instead of the 12k they suggest in this video. So yes, I replaced the 56B resister and used a 3k. Either method should work. Their method just puts two resistors in parallel. Use this diagram to see what I mean by putting a 33k ohm resistor in parallel with R110. I turn the varistor closest to r110 to adjust the voltage. It's been a while, but i think its the 3rd one counting from left to right. It's the one closest to the 22k resistor they install.
I am looking for 14.75V (300A) to parallel a few to run a hi power Communication Amplifier , can i get that voltage with your value resistors ? Or should i change values ? Any info appreciated.....
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.
The same.. Did you manage to solve the issue? EDIT: In my case, resistor from MCU P19 was damaged, my fault.
Great info.....i see one end of your resistor from the MCU seems like it's soldered on to a blue wire, did you use the wire to attach to pin 19 on that square IC ?.......i find it hardly got any room to solder anything there
@@karolp1993 Hello!the original value of resistor was 3,75k ?
@@balazsbanai5930 i think so
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.
good day. Hey, I have a HP DPS-1200FB-1 A power supply. Do you know how I can increase the voltage to 14vlt?
I used all variable resistors, and disabled the OVP.
@@HSRA-hg9gcif you don't mind me asking, What size of variable resistors did you use?
Where does the blue wire go?
The blue wire is hooked up to pin 19 of the MCU (PIC16F887) or connected to the resistor marked as 56B.
@@taoli1239 would you by any chance have some pictures?
@@dandavis8871 OVP1 image: github.com/darwinbeing/HPServerPSUHack/blob/main/resources/PD19_OVP1.png
@@taoli1239Can you upload clear photos for the other 2 resistors?
Can you upload clear photos for the other 2 resistors?
please my friend it is very necessary.
+