r9 290 "black screen"

[Francesco Valsecchi]

hello i bought a faulty radeon r9 290 (black screen) to learn to fix gpu's, when it arrived i mesured resistances on 3.3 v and 12v both on the pcie connector and cables i have no idea on how to recognize 1.8v pex and 5v but i checked all inductors and none had a dead short only one was 55 or 140 ohms i don't really remember and i assumed it was memory i installed it on the pc and it delivered no image, not even a backlight so i installed it as a secondary graphics card using the igpu as primary, both device manager and gpu-z only showed the igpu so i assumed it was acutally a no detect even tough the monitors tried to turn on when they were plugged in the gpu, i then downloaded flashed mats\mods for my radeon card on an external ssd and while trying to boot into it with the i gpu it delivered black screen, i switched to the r9 and it outputted an image, i didn't run the memory test and went into windows and it ran furmark nicely until it reached 94* and at first black screened then after a reboot started artifacting but kept running, then after another reboot it artifacted on desktop and stopped working, i repasted since it didn't have a hotspot reading so i assumed it woul'd stop working because it had over 100 degree hotspot, after the repaste it stopped detecting i ran a mats test and it passed with no errors (elpida memory ) so i rebooted to windows and started working again i'm now running superposition sterting with 500 mhz clock and incrementing by 100 until and it crashed at 900mhz and started showing artifacts then it started working again for a bit at 1000 mhz and crashed again it seems like a driver crash because when i close the benchmark it goes back to normal but i get a amd error report, i tried to reflash v bios using https://www.techpowerup.com/download/ati-atiflash/ flashing this bios https://www.techpowerup.com/vgabios/...90-4096-131222 but i get mismatch p/n and it fails to flash the vbios, i don't know if my card is the oc version or not. the vram test only has 290x options i don't think that it affects my results, what else can i do?

[kacangpolo]

graphic card showing artifacts may be its problem on chip, with more poin you already test that VRAM is good, problem on chip not always to be dead or no display, sometime artifacts can be occur if thats chip was broke, tell me if im wrong, just saying with my exp

thx

[Francesco Valsecchi]

Its not really artifacts, It only artifacts After crashing, i tried putting RAM clock from 1220 MHz ti 650 and the card crashed i can only get It to 650 mhz if i First lower It but not all the way, Is It a sign of dead Memory controller? Also some days It works more than others