820-2936-B - Turn ON and OFF

menatwork

New member
Green Light - OK
PPBUS_G3H - OK
PP3V42_G3H - OK
PP5V_S5 - OK
PP5V_S0 - 2.20v and drop for 0v (turn on and off fan)
 

dukefawks

Administrator
Looks fine? Measure it!
If R7402 is ok then measure voltage on Y2805 should not exceed 1.6V else clock chip is dead.
I assume this was a liquid damage?
 

larossmann

Administrator
Staff member
if resistance over C7050 doesn't exceed 2.2 to 4 ohms then U2800 is probably dead. so check duke's advice because that is the best way to tell if U2800 is dead. i am also going to guess your liquid damage was on the rim, by either vp0r sensor, thunderbolt area, or smc. even if the clock chip has no corrosion or water on it, just water in that area, it means it is dead..
 

dukefawks

Administrator
What is is not?? You say no backlight and now there is no image or chime......
Connect a USB mouse and see if it lights up, CPU Vcore present?
 

dukefawks

Administrator
Board is working. Connect a known good LCD and hold a flashlight to the back of the Apple logo to check if there is an image.
 
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