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Radeon HD 5850 artifacting and flickering, sensitivity to physical contact

post #1 of 4
Thread Starter 
I have a used Radeon HD 5850 (ASUS, reference card) that I got cheap. Even when I got it, it seemed strangely sensitive to physical contact - it had a rattling fan, which I could temporarily fix by giving it a gentle knock, but this often caused flickering/artifacting (the kind you'd expect when hitting an old tube TV very hard, where the image appears to "wrap around" the bottom/top, sometimes just vertical coloured bars) and sometimes locked up the system completely, usually accompanied by blank screen or vertical bars. I fixed the fan, but to do this I had to take the card apart, and after the reassembly things just got worse - sometimes the system doesn't boot (everything spins up but screen remains blank and the OS doesn't load), sometimes it boots but with constant screen flickering/artifacting during bootup (even in BIOS), sometimes it boots normally. Temps are good (never over 60C even when stress testing), and as far as I can tell all VRMs are making good contact with the heatsinks (I'm using thermal pads).

The strange thing is that having both my monitors plugged in makes this a lot worse - with only a single monitor in place, I can boot the box quite reliably, but with both plugged in the festival of no-boots and artifacting begins. Also, when it refuses to boot, I can sometimes fix this by just moving the card a little - even unplugging/plugging the PCIE power connectors (they're definitely all the way in) or unscrewing and screwing the card back on can do it. The artifacting goes away after warming up, though - even dual monitors work without issue as long as I connect the second monitor after the system is booted up and has run for a bit. I've had the system lock up with blank screen or vertical bars when waking from sleep, but only after it's been asleep for a while - sleeping the machine for ~10 seconds and then resuming works fine.

Anyone know how I might fix this? Did I just buy a (soon-to-be-) dud?
post #2 of 4
Does look like the card is on its last legs.
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Vaporizer
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen 5 1600X 3.9Ghz@1.265V Gigabyte AB350N-Gaming WiFi Sapphire RX Vega 64 G.Skill Flare X 3200MHz CL14 
Hard DriveHard DriveCoolingOS
Seagate 1TB 2.5" HDD ST1000DM035 Samsung 960 Evo 250GB Noctua NH-D9L Windows 10 Pro 
MonitorKeyboardPowerCase
Dell U2515H K70 Lux Cherry Brown Corsair SF600 NCASE M1 V5 Silver 
Mouse
Steelseries Kana V2 
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post #3 of 4
Tried baking it? A friend had a Gigabyte 5850 with similar symptoms and gave it a bake. He's still using that card and it's been more than two years.
post #4 of 4
Thread Starter 
Well, this morning, it seems to have gone completely. Even using a single monitor and waiting half an hour for it to warm up didn't help today, nor did percussive maintenance. I managed to boot the system once, but complete freeze and vertical bars came in about 2 minutes in.
Quote:
Originally Posted by Dr. Vodka View Post

Tried baking it? A friend had a Gigabyte 5850 with similar symptoms and gave it a bake. He's still using that card and it's been more than two years.
I'll probably do that at some point, seeing as I now have nothing to lose.
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