ga-ep43 ds3l power problem

[Nikolov]

Hello everyone

I have  ga-ep43 ds3l mb, last week mb won't turn on. I remove cpu, ram, graphic card.... only mb and psu, and when I try to start mb phase leds only blink!? BUT!!! when I remove 4pin (atx 12V)-for cpu, mb turn on and phase leds turn on, psu fan  rotate and work. What is the problem with 4 pin atx power, why can not turn on the MB ?? How to repair this MB.

Thank you
Branko Nikolov

[dmdilks]

It can only be 3 things PSU, CPU or that connection on the board when bad. If you can test the PSU and CPU in another computer. If they both work, then it is the Mother board. 

[Nikolov]

I tested only MB and PSU, without cpu, ram, gpu... with two woking psu's

And it is the MB 100% but what? I forgot to tell: on qc8,9 fet transistors they was heated the mb from backside has heated spot, and I replaced this fets qc7,8,9,10,11,12 and I the problem is still there mb won't turn on? maube mosfet driver, transistor, choke?