820-2914 GPU vcore short

[Kyle93]

Have a 820-2914 that powers on and chimes but no video. Changed GPU with new 16+ from SEE-IC but still have short on GPU vcore. Injected 1V into the power rail but nothing is getting warm. What to try next?

 

[2informaticos]

What is the exact value of that "short"?
Missing image and backlight too?
Did you test external video?
Can confirm 100% USB activity?

 

[Kyle93]

0.003 is the exact value of the short

Missing image and backlight

tested and no external video

No usb acitivity. USB lights up for few seconds then remains off

 

[2informaticos]

Is that diode mode, or ohm scale.
0.003 in diode mode means 5-6 ohms, depending of multimeter.
In such case, shouldn't be short.
But this board can be tested/used disabling GPU.

 

[Kyle93]

Diode mode. I get 0V on GPU vcore and already replaced GPU with known good 16+ GPU

 

[2informaticos]

Why didn't test disabling dGPU first?
This way discard another problem on board.
This board suffers by GPU issue, but is very easy to test if is just that and no other thing.

 

[Kyle93]

Not sure how since board hasn?t given a image or backlight since I had it. Heating original GPU before replacement didn?t help either

 

[2informaticos]

You can do it with Medusa programmer, or using dedicated Tiresias GPUkiller module.
http://www.cmizapper.com/products/tiresias-gpukiller.html