FSA011 Server Power Supply Increase Voltage

[Chief7]

I successfully shorted the pin on the back to get the supply to turn and supply 12 volts but wanted to increase to 13 volts.

I found another post here on the forum with some details but then the poster abandoned.

Here is what I have.

    https://www.mydigit.cn/forum.php?mod=viewthread&tid=237625
   IBM X3650M4 550W power supply converted to 13.8V and fan converted 
    Posted on 2021-2-26 00:09:56 | Only look at this author  Reply Rewards
   This post was last edited by nomos on 2021-2-26 00:25
   
   IBM X3650M4 550W power supply converted to 13.8V and fan converted
   Changing the voltage of this power supply is simple, but changing the fan is troublesome and requires manual skills. The fan has speed monitoring, but if the speed is not reached, it will be protected. If you want to change the silent fan, you need to use a pulse generator to trick the detection circuit
   
   The water quality of the text is poor, please look directly at the picture:
   1. Start
   2. Change the voltage, change vr201 to 10K adjustable, remove the resistance connected to the right lower pin of vr201 and short connec
   3. Buy a well-built magnetic levitation fan, 2 wires are enough, buy a ne555 pulse generator, the original fan has 4 wires, the red and black wires are connected to the fan, the yellow wire is connected to the output of the pulse generator, the blue wire is not used, the world is quiet
   After the finished product is revised, I am laughing and want to smash M coins:lol::lol::lol:
    In addition, as a friendly reminder, please discharge fully when disassembling the machine and replacing the fan, and be careful of high-voltage clicks

Photos attached


I removed the resistor and shorted now the supply won’t fully power on. The warning light just comes on.  Adding the potentiometer doesn’t help. 

Any suggestions for what else to try?

[HelenaFairchild]

I am replying here so that I can keep eye on this thread.

[Psi]

Adding external wires in the voltage divider feedback to add an external potentiometer can cause things to go a bit unstable and oscillate.
Usually you want to replace the SMT pot with a new one to keep the circuit small. Or solder a SMT resistor near the pot.

Also, the instructions say to change the pot but you look to have added a new pot across the old one? Or did you cut a pcb track?

[Chief7]

The photos are from the Chinese post not mine. I did added to existing like their photo. I will remove the other and see if that helps.

Thanks so much!