820-2850 Kernel Panic

[WeLoveApple]

Board is ths one: https://www.rossmanngroup.com/board...ng/6532-820-2850-a-gpu-panic-and-green-screen
Continued here...

Reballed MUX. It solved everything.
It did work for a month or so now kernel panics re-appeard. Even worse than before (now with bot GPU. and much more frequent)
Any idea where to look this time?

 

[dukefawks]

Did you not replace C9560?

 

[WeLoveApple]

Yes, it was replaced with a standard non tantulum cap.

 

[dukefawks]

Kernel panic report? Is it even the GPU driver crashing now? Could be RAM stick or a bad slot too.

 

[WeLoveApple]

It is the same. AppleMuxController crashes.
Checked ram slots and sticks. Same.
Run ASD. Only a battery capacity error, which I guess is irrelevant.

When it crashes usually it does also shuts down the machine. Then it wants to start again. But after a second it shuts down. Then this repeats a few times until it manages to chime. Sometimes even the Status indicator blinks three times.
Any idea?

 

[WeLoveApple]

Another weird thing is that sometimes when I start it up without battery it only sees the external GPU.....

 

[dukefawks]

Seems like a MUX issue to me then. Reball another MUX from a donor board.