Did anyone figured the common video problem on 820-3330 yet?

[roy.ruan]

in recent few days, I got two more 820-3330 came in.
shoot, pretty much same problems as the ones I encountered previously and didn't solve.
video issues, sometimes switch to NVIDIA graphics then it freezes, sometimes just distortion. (not like the mux kind color distortion,but like the whole image got twisted or something)
one specific board has no output on the display port, not sure if it's related.

thinking problem should be laying around the video circuit, I actually replaced the GPUs previously but that didn't solve the issue, so thinking on the GPU power circuit now.
can't find any capacitor similar to 820-2850... so really no clues, anyone solved this problem yet?I think it's pretty common, I came across about 5-6 boards these few months of this problem already( this specific model)

thanks

 

[dukefawks]

I have one here too now. I may look into this in the next weeks. No idea what it is at the moment.

 

[roy.ruan]

sure man, Im working on it too,just no clue so far,let me know if anything,thanks

 

[dukefawks]

I already replaced GPU and resoldered U8900. I doubt it is the VRAM so not touching that yet. I'm not at work this week, maybe you can look at C8360/1?

 

[roy.ruan]

sure,let me try that and let you know

 

[roy.ruan]

just want to update a bit,got sometime today and dealt with C8360 C8361.
replaced with poly-tant the big one , 330 2.5 , but seems no luck,problem is still there.