[SOLVED]820-2850 with grafik problems

[Dozer]

hi, i am just working on that board.

I have picture
running ASD and select Video Controller internal i get in the first(open GL point test) a Failed

if i run the same test now for video controler external this open gl ... test is passed
after that again running only for internal and it passes through without problems

c9560 is replaced already

if i plug in an external monitor there i have no picture

sometimes asd running it shows only the test for external controler

is it a good idea to reball the gmux?

 

[ALB-Repairs]

just spend ages picking of the edge bonding and ensure theres none under the chip, then a reflow will do the trick, Much easier than reballing.

 

[Dozer]

I tryed that without an result. So i was going to pull the GMUX and put it back recalled.

still not better. So the only thing what could be is an damaged gmux all power and clocks are ok.

I replaced now the gmux with a good one from a donor board and voila it works perfect.

thanks for help