820-00138 Fan Spin > Restart > High Fan

820Slave

Member
I don't know where to start on this one.

I have the pdf but no bv. grrrr

green/amber charger
vcore, g3h, 342, present, warm processor

no backlight
no bootchime

fans spin up for 10 seconds or so, stop, spin up again to high fan. I don't know if that is the regular startup routine similar to 820-3437 etc.

coils above processor seem unusually warm, I could be mistaken.

Any leads would be appreciated.
 

2informaticos

Administrator
Staff member
Any history available?
Check for USB activity when board stays on.
You can try new BIOS, with clean ME; don't forget to save your backup...
 

820Slave

Member
looks like a keyboard spill and some thru the back vent, corrosion near the keyboard backlit connector. board was run through the USC. Damn, sorry not providing important details.
 

2informaticos

Administrator
Staff member
"Check for USB activity when board stays on."
Try the board on the desk with nothing connected, apart of USB mouse.
Better to use OSX pendrive witk link LED; if flashes, 100% USB activity confirmed.

"You can try new BIOS, with clean ME"
Did you do it?

Fan goes high normal, if trackpad is not connected.
 

820Slave

Member
No apparent USB activity.

1) USB Mouse will light up
2) USB Mem Stick with LED - NO access light. Verified Mem stick will blink on other Mac.
 

SMMRepair

Member
CPU power supply circuit getting hot + liquid through back vents and to KBD BL conn. (right by S5_HS) + high-fans/no chime = dead CPU. You can confirm by checking all the usuals, but this one's going to be dead.
 
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