820-3662 board clean, fan, no screen, no chime

raainxx

Member
Hi,
i have this board, i check all rail are GOOD (no mistake).
the board start fan, i can make a PRAM (i see the fan stop and restart). no chime, nothing on screen, nothing on the external display (with keyboard external), mouse on usb (no light).
Corrupt EFI? Board clean no liquid, what is the issue?
thanks
 

JohnB8812

New member
Yeah this could be a whole lot of things then. Inspect closely for any signs of previous liquid near SMC, BIOS, U1950, ad JTAG connector.
 

raainxx

Member
i check for sign of liquid but really nothing.
I ask to the customer, he say the mac stop work when using.
Have you an idea?
 

2informaticos

Administrator
Staff member
What you lose if try another BIOS dump?
Could confirm yourself if is BIOS issue after that...
Google should find some dumps I suppose.
 

raainxx

Member
i try a cleam me, problem not solve.
i don't know what can i do. the mac start like normally but no screen and no chime, not work external display, i think no boot but make reset PRAM (fan change speed)
 
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