Thermaltake Power Supply 1200W repair. An easy one

[@digant1973]

I have a similar power supply from thermaltake. It is 850W but the board layout is equal to the 1200w you repaired. I also have the same issue as in your ps. So the standby voltage is OK but when I turn on the ps it immediately shutdown (I hear the click of the relay immediately followed by the release of the relay). I also tried to measure the output voltages before the shutdown and I measured good values (3,3 for the 3,3V output, 5,2 for the 5V and 9 for the 12V). Probably I cannot measure a proper value for the 12V output because the ps shutdown immediately. I checked every component in the board (transistors, diodes, smd etc and everything is good. I also replaced the electrolytic capacitors for the 12V output (original ones had a good ESR but measured 1800uF instead of the reported 2200uF) but the issue is still present. I also resoldered the same transistor causing the issue in your ps but it didn't fix my issue. In case the ps shutdown is due to an over/under voltage detected by the monitoring IC (PS224 on that board), which signal/pin is responsible for the shutdown of the secondary? e.g. PS good signal (PC wire on the ATX 24 pin cable), FPO pin on the PS224 chip?

[@electronicshaverightstolive]

Ps224 can monitor all voltages 12, 5 and 3,3. I had several power supplies with bad resistor (10 or 100 Ohms as I remember) on 12 volts line, probably one or two on 5 volts line and never on 3,3 volts line.

[@digant1973]

@@electronicshaverightstolive thank you for the fast reply. I also had some suspects on 12V. If it can help, before the ps was no more switching on, my PC had very strange behavior such as switching on automatically (without pressing on the power button), Also the PC took a loot of time to start (20 minutes) and I could clearly hear something wrong on the 3,5" HDD (a sort of click like there was not enough voltage from ps). 3,5" HDD uses also the 12V. For that reasons I didn't use the PC for 1 year. When I tried to use it again the PS didn't turn on at all. Please let me know if those symptoms are familiar with a possible cause on PS. With bad resistors on 12V rail, are you referring to the smd on the back of the board (on the front there are few non smd resistors that measured ok)?

[@electronicshaverightstolive]

@@digant1973 you can find those pins of the ps224 in its datasheet. From those pins it should go through those resistors to 12, 5, 3.3 lines. Also measure minus 12 volts line (I hope you measured already other lines) compared to the ground in diode mode. Should show high voltage drop. Also if you have lab or simple 12 volts power supply, connect it to 12 volts line and check whether 5 and 3.3 volts lines are generated by DC DC converters.

[@digant1973]

@@electronicshaverightstolive yes I checked also the -12V line. I know the pinout on ps224. I also removed the monitoring board (the board vertically mounted on the main board) and detected the pins on the monitoring board just to eventually test it applying 3,3, 5, 12 and -12 V from a lab power supply. I checked also the components on that monitoring board and all the smd components seem OK. I also removed and checked the two vertically mounted boards containing the APW7073A (Synchronous Buck PWM Controller). One of the two boards is connected to the main board to GND, 3.3 and 12V and the second board to GND, 5 and 12V. I will check again the components on those two boards. So you are suggesting to directly apply 12V to the 12V line on the main board so the board will not shutdown and I can measure also 3,3, 5 and -12V outputs. Is there a specific point where I have to connect the 12V power supply on the 12V line? e.g at the origin of the 12V line (so before diode etc...)? thanks again for your support

[@electronicshaverightstolive]

@@digant1973 it doesn't matter where you connect 12 volts if is 12 volts line. I usually connect on pci-e connector. You should see 5 and 3.3 volts generated.

[@funkblack]

I surprised he did not get shocked handling the board like that.

[@That2007YZFR6THUNDERCAT]

Can I buy one of those testers

[@Remie79]

At what time did you do the repair?

[@electronicshaverightstolive]

Usually do repairs at evenings after finishing my main job.

[@That2007YZFR6THUNDERCAT]

Idk what’s wrong with my psu I put it in wrong in my computer and it didn’t turn on at all no fan spin or anything help please

[@electronicshaverightstolive]

Hard to tell for sure. Do you have any voltage at PSon pin?

[@That2007YZFR6THUNDERCAT]

@@electronicshaverightstolive how do I tell I only know the psu is 600w and isn’t turning on but I’m using a dell optiplex

[@That2007YZFR6THUNDERCAT]

@@electronicshaverightstolive unfortunately I don’t own a volt meter but do u think if I put the psu into a working system do u think it would fry it too

[@electronicshaverightstolive]

@@That2007YZFR6THUNDERCAT no, I dont think so.

[@That2007YZFR6THUNDERCAT]

@@electronicshaverightstolive do you think my psu might be blown?

[@kosmosyche]

So, I have a Thermaltake 1000W PSU, I've had it in my system for around 10 years. It seemed to be working fine until I bought GTX 1080 Ti 2 days ago. Now after about an hour of playing games it just shuts down and refuses to turn back on for about 8-10 minutes. Then it turns on again and works like nothing happened. So it's some sort of thermal shutdown. And it turns out the PSU's fan is dead. lol Now I want to fix it. I mean, if it's just a fan itself that died, it should be easy enough to replace, unless it's more complicated than that.

[@electronicshaverightstolive]

Yes probably it's only a fan issue. You just need to replace it or very often fun's shaft is stuck and all you need to fo is to oil it.

[@coloradowilderness3139]

It is not so easy for me to detect the fault . Thanks

[@electronicshaverightstolive]

Yeah. Sometimies faults are impossible to detect even for professionals. But obviously there is no need to download the video where one can not detect a fault. People dont like such videos.

[@coloradowilderness3139]

Actually i have learned many troubleshooting fronm you. BTW it nice channel ..

[@electronicshaverightstolive]

@@coloradowilderness3139 thank you for nice words!