820-2879 sudden restarts

[arash]

Hi everyone,
Restarts at various different stages - on OS X after a few seconds, after long usage, during booting.
Any ideas?
Thanks guys.

 

[luk812]

Hello !
Please explain more details...
you have done several tests?
magsafe? mesures of voltages? research on logic board?

 

[arash]

What should i test exactly? ASD finds no error, sometimes comes the ram error beeping sounds, but on the next try turns on perfectly, magsafe lights as it should and battery charges as it should. voltages on the board look fine to me, should i test the voltages for any specific component? i have the brd file for this board.

 

[aprendiz]

Try one RAM slot at a time and see if problem remains, the battery is original????

 

[arash]

Have done that extensively, same result, different DIMMs and different combinations.it's a very weird case for me.

 

[dukefawks]

Did you try ONE slot at a time, could be one bad RAM slot. Also these boards you MUST use PC8500 RAM.

 

[arash]

Sure. That was the first step, different DIMMs of 1066 in different combinations. always same error.

 

[dukefawks]

This was probably dropped. Cracked PCB traces under SMC or RAM slots. This goes in the garbage pile, sorry.

 

[arash]

yea looks like it.