Hello guys! I need some help.
I am trying to repair my PC Power Supply. I have a Thermaltake LitePower 600W. I know what are you going to say about this model, i understand that is not a "corsair" or an "antec" or "evga", please allow me to quickly explain what happened:
#1. During a storm, the 230V wall socket damaged my Belkin 230V socket multiplier.
#2. More than ~100V was induced into the "ground protection" wire.
#3. I found out that the apartment doesnt have the "ground protection" connected.
#4. So my pc PowerSupply received ~230V + 160V(200V) on ground protection.
#5. My Power Supply died after running several weeks with this incorrect additional Voltage.
#6. Only the pc PSU died. The other components of my desktop are fine.
#7. When i try to start the PSU, it starts but after 1 second it stops.
#8. When i say "it starts" i mean the PSU fan is rotating and i have 12V,5V,3V output for a second.
I have measured the voltages inside the PSU. I have attached photos.
Voltages:
A= ~ 230 V ~
B= ~ 230 V ~
C= + 317 V
D= + 317 V
OPTOCOUPLERS model= 817B
OPTOCOUPLERS O1-O2-O3 [STANDBY MODE](when the PSU is not "running")
Optocoupler 1 :
PIN1-PIN2= 1 V
PIN3-PIN4= 0.8 V
Optocoupler 2:
PIN1-PIN2= 0 V
PIN3-PIN4= 19 V
Optocoupler 3:
PIN1-PIN2= 0 V
PIN3-PIN4= 2.1 V
OPTOCOUPLERS O1-O2-O3 [POWER-ON MODE](running 2 seconds)
O1 : nothing(same voltage)
O2 : nothing(same voltage)
O3 : PIN3-PIN4= increasing to 8.5 V [ FROM 2.1 V ]
The +5VSB is present, from the small transformer, byt without the schematics, i dont know all the points that must have +5V SB.
Important DETAIL: When i measure the output voltages +12V +5V +3V, i have noticed something:
When i measure the G point(see photo), the +5V is draining very very fast. The DigitalMultimeter is hardly able to read the +4V(5V) it reads +2.xx V.
When i measure the +12V, is slowly decreasing 11V, 10V, 8V, etc, 1V to zero.
Same thing for +3.3V, the voltage drops to Zero, Slowly.
The PSU is not connected to anything, it has no LOAD
I have replaced a N-channel MOSFET(FDPF 13N50Z), you can see the dark spot on the PCB(on primary stage of course).
Does anyone have any ideea where it might be the problem? Is it in the primary stage? or secondary stage? Can anyone help me to identify the BAD component?
i dont know if this helps but here are my pc specs:
PSU: Thermaltake LitePower 600W
CPU: AMD FX 6350(default)
Mainboard: Gigabyte 990FXA-UD3
RAM: HyperX Savage 32GB DDR3 1866Mhz(running at 1600Mhz)
GPU: Gigabyte GTX 660
NOTE: I already searched the web, i also read the PSU101 article from the site, i have learned some things but i cant figure it out, the problem. I dont have the schematics and this makes it very difficult for me(for everybody).
ps:the Belkin device damaged my pc PSU by delivering ADDITIONAL ILLEGAL ~200V on the protection line, non-stop after the storm, until i found out that the Belkin device was delivering ~230V plus additional ~200V(on the protection) to my PC.
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