Hello everyone.

My son came to me one day saying that his pc locks up.
I found his onboard sound and gpu not working.

The gpu is an R7 370 and it has weird colors in bios and locks hard when windows/linux loads a driver for it.

I have run a diagnostic utility (a linux based app with mats/mods for nvidia and tserver/memfa for AMD) and it spew out some things.

It says error on ch7 rank 0 bit 14.
Now, i have no idea which of the 8 chips is ch7.
There are 4 chips arranged vertically to the right of the gpu and 4 horizontally...

Hi everyone.

I got a broken MSI R7 260X for $10, seller said there was a surge and afterward graphics and network stopped working.
The power supply goes into protection if inserting the 6pin ATX12V into the graphics card.

So i figured, well, yeah, some mos broke in the VRM, should be easy fix.

Indeed, a Hiside mos was shorted and i replaced it.

The Vcore was generated by 2 switcher groups (hiside + loside MOS and an inductor in each group) powered from 12V PCIE and another 2 from 6pin 12V ATX. The broken mos was on the 12V ATX...

Re: New Members - please post your introductions here

Hello everyone.

I'm John (little John more precisely) from Romania.
I am a tinkerer in electronics and just about anything i can get my hands on.
I'm also interested in too many things for my own good.
I like to know what makes things tick.

Of course, that and everything else in life, leaves free time dangerously going to zero.