AMD 7900 XTX VDD_MEM short

[karoliens]

I am working on AMD 7900 XTX board that initially had faulty E, F, G, H memory channels (near PCIE). Board is also bent.

I have reused G and H modules and put new E and F modules. Now no failed channels are detected, but I measure VDD_MEM - 0.4 Ohm to GND.

Other measurements are as follow:

VDD_SOC - 0.7 Ohm VDDCR_GFX - 0.3 Ohm VDDCR_USR - 4.4 Ohm VDD_MEM - 0.4 Ohm VDDCI_MEM - 11.3 Ohm 1.8V_S5 - 379 kOhm 0.75V - 48 Ohm 12V_BUS - 4.4 kOhm 3.3V_BUS - 1.3 kOhm

I guess it is either dead core or something else is shorted on the VDD_MEM line.

Would you inject voltage to VDD_MEM and see what is getting hot or remove two inductors and check on which side thw short is first?

Board did not have any previous repair, was still with warranty sticker on the screw except as mentioned is bent I guess due to a sag.

[lezsimply]

I had almost the same issue like you but on a different card, a 6600xt. I tested all coils and ended up on vddm. I took the risk and injected voltage on the coil. Found out both memory and gpu core is heating up all at the same time. I did not proceed further as I know most of the time it is the core.

[mayurikid]

I have a 7900xtx reference with a Communication error that lets the IC that holds the driver not communicate with the CPU. so the GPU gets suspended and the fans ramp up to safeguard the gpu.

Failed to get fan speed.
TransferTableSmu2Dram?
smu cmn reg print error

[Laojiu]

7900xtx The core is really fragile