Is there any hope for 820-2850 boards with obvious GPU distorted display issues?

[bjf]

I preemptively replaced C9560. Screen has pixelated green like the 2011 models when they fail. Any hope besides messing with GPU chips?

 

[bjf]

ok, looks like it's reball the GPU MUX

 

[dukefawks]

Picture plz?

 

[arghhh]

I had one that was bad screen assembly last week. Really did look like a GPU issue with lots of green lines running through, so don't forget to rule those out.

 

[ALB-Repairs]

+1 for GMUX reball.

 

[bjf]

Yeah, thanks, I can press on the MUX chip area and get it to fail in different ways. Does anyone know the stencil type to get? For some reason I'm going to spend the time to reball this.

 

[dukefawks]

http://www.ebay.com/itm/90-90-0-25m...ball-Universal-Stencil-Template-/400644809049

I cut out the part with the holes. Just dump balls on there and heat the whole thing up. The balls will only stick to the places on the chip where there are pads.

I would first try to reflow the chip, make sure you 100% clean the glue from under the chip.

 

[bjf]

Perfect, thanks. I ordered those.

I tried to reflow it. Obsessively removed all glue under microscope. First attempt changed it slightly for the better, but still green. Second attempt left me with a black screen. I increased the temperature and airflow a fair amount the second time so I might have fried the chip.

 

[Repairable]

sounds like bbq time or missplaced a bit