Hi all,
I have purchased a "spares or repair" AMD R9 270x on the bay, just as a fun project.
The board worked in my test system. I ran some tests and all was well. When I tried it in my main desktop, it refused to display a picture.
Back on the bench and it was booting up 50% of the time.
I found a short on a line - on the right hand side of the board, not the main phases on the left. Injecting 1.5V I identified a shorted capacitor at the back of the board. I temporarily replaced it with an electrolytic (I measured the one close to the shorted one to guess the capacitance) and the short was gone.
When I tried the board again, it was still booting up 50% of times - then it started behaving well and so far I haven't been able to replicate the issue.
I notice that when I power up, the fans "try to spin" twice before they eventually spin normally. Also, when it fails to boot, the fans spin at full power - and the GPU gets very warm.
My question is: how is it possible for a video card to work with a short on it? And is that fan behaviour normal for that type of card?
Thank you!
I have purchased a "spares or repair" AMD R9 270x on the bay, just as a fun project.
The board worked in my test system. I ran some tests and all was well. When I tried it in my main desktop, it refused to display a picture.
Back on the bench and it was booting up 50% of the time.
I found a short on a line - on the right hand side of the board, not the main phases on the left. Injecting 1.5V I identified a shorted capacitor at the back of the board. I temporarily replaced it with an electrolytic (I measured the one close to the shorted one to guess the capacitance) and the short was gone.
When I tried the board again, it was still booting up 50% of times - then it started behaving well and so far I haven't been able to replicate the issue.
I notice that when I power up, the fans "try to spin" twice before they eventually spin normally. Also, when it fails to boot, the fans spin at full power - and the GPU gets very warm.
My question is: how is it possible for a video card to work with a short on it? And is that fan behaviour normal for that type of card?
Thank you!
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