Re: 820-2849 No POST

Thanks for the insight guys. It looks like the mouse still turns on without RAM. I also tried installing U6100 from an 820-2850. Symptoms are unchanged. I'm leaning toward the CPU being dead on this board.

Re: 820-2849 No POST


Thanks for the reply. Unfortunately this has been sitting and gathering dust for a good while now so history on the board is a mystery. There are no visible signs of ingress though and the board is actually in very good condition. No contamination aside from flux residue in the areas I've already checked/reworked.



This is very valuable information actually. I didn't know removing RAM should prevent the host controller from enabling. I'm fairly certain I checked the USB function with RAM installed so I'll check again with...

Full disclosure, this thread is also on advanced reworks but it seems there's not much activity there these days. I have an 820-2849 here that won't POST. Full symptoms:
[LIST][*]No chime on case speaker.[*]Fans spin up and stay on. Doesn't power cycle on its own.[*]Fans run high if trackpad is disconnected validating SMC function.[*]No absent RAM beeps when RAM is removed.[*]Mighty mouse lights up when plugged into USB port.[*]PM_PCH_PWRGD high. Probing CPUIMVP_PGOOD with anything, even a disconnected multimeter lead however causes the board to turn off (fans stop). I thought R2850 might...

Re: New Members - please post your introductions here

Hello,

Electrical engineer by trade but I do board repairs in my spare time.