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820-2850 No PPBUS_G3H

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RyanLEN

New member
Maybe this will help explain better than I am. In order to get it to turn back on I have to remove battery and magsafe. I do get ppbus from battery. Thanks.
 
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jadao

Member
Without battery, with only charger, when it first boots itself and you turn it off with power button, can you turn it on again with power button?
Did you tried with the board out of the case to rule out any BIL/KBD connectors issues?
 
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RyanLEN

New member
Hi. No... I can not turn it on with power button. I have tried the board in two different cases both known working also outside of case jumping power pads. Only turns on when I attach charge to magsafe. Thank you.
 
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dukefawks

Administrator
"When I press the power button the light on the charger goes from amber to green and the fans twitch"

Does that still happen?
 
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dukefawks

Administrator
That would mean it does an SMC reset when you press the power button.
Check corrosion around U5703, U5001. See what SMC_RESET does when you press power.
 
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RyanLEN

New member
Hey Duke... SMC_Reset goes from 3.4 V to 0 then back to 3.4 V when I press the power button. Checked around U5703, where pin 5 was actually missing! I did replaced it, and SMC_RESET now holds steady 3.4 V when pressing power. Only thing is now the WHORE wont turn on... LOL... PPBUS is 11.94 with battery only. 12.56 with magsafe only. With battery and magsafe it starts at 12.08 and slowly climbs up to 12.56. U5001 looks fine. Thanks for your help and have a good one.


Update - Pressed power button 1/2 hour later and everything is working as it should. Not sure what changed from sitting for a 1/2 hour.
 
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dukefawks

Administrator
What changed that you are still not using a REAL 85W charger. The machine will only power on when the battery has some charge in it when using anything else than 85W.
 
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