I am troubleshooting an R9 290 graphics card with reference PCB

It is not powering up.



I bought a good R9 290 to help me with this. The U300 converter requires 12V input on its upper-left pin and 5V on the red marked pin. As a matter of fact, on my bad card, this 5V does not materialize. It's like 0.25V. We have a short here, because the resistance to ground is only 25 Ohms, and it should be like 50k Ohm.

From here, I have no clue how to further troubleshoot and find the bad component.

I also note some (significant) differences in the resistances of the green marked capacitators, The green side = ground. The 8 ones on the right have 34 ohms on my bad card and 285 on the good one. The C102-C104-C305 have 1.8k ohm on the bad card and 4k on the good card. I have no clue if this is significant and if it is a cause or an effect.

Anyone has access to friends who would know more about this PCB?

don't have my electrical engineer guy's phone no. anymore
prob not the appropriate forum to post this
at least try on tomshardware

I remember I sent this guy a few technical questions and he was very helpful and pretty quick to answer
https://www.youtube.com/watch?v=_5NnXuWf2GI

I will be spreading this question on the internet

There are some wizards that repair GPUs on Youtube. They don't tend to reply to questions

I've posted on AMD forum, but I will be trying a couple more forums too. Tomshardware is a good suggestion. Pops up on a lot of searches I perform