820-3437-B only turnes on if you hold the power button

andrew boren

New member
if you try to turn it on normally the fan just spins for one second. if you hold the power button for about 5-6 seconds it turns on and runs normally. everything functions and i did an apple diag test and it passes. if you restart the machine it restarts normally. but if you shut down it wont turn on unless you hold the power button for 5-6 seconds again. this is with and without a battery. i assume this is not acting correctly because it wont turn on by itself. no battery and plugged in to power it wont auto start
 

aprendiz

Moderator
This board should turn on and off 3 times after remove battery, did you let it 1 min to do the process?? inspect for liquid damage the power board and flex and the logic board...
 

andrew boren

New member
tried with a known good power board and cable. and already ran this threw water damage treatment. as this was water damaged, forgot to mention that
 

andrew boren

New member
there was a break between r7151 and c7150 and the probe point 790 so i ran a jumper between all 3 points and it started to work. can you explain how it was still able to be bypassed by holding down the power button? and how it passed apple hardware diag? im glad you had an idea where to look and im grateful for the help but i would like to learn how you came to the answer to check current between the pins for a weird power issue like this one.
 
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