820-00928 NO water damage, 20V, No fan, no chime, no image, no boot

MaxFix

Member
Hi there,

No signs of water damage.
Magsafe charger switches from 5V to 20V.
All main coils (and there are many on this board) - 0V, except for L7660 - 3.31V.
No pulse on ON/OFF button press.
SMC bypass - same. Though I am not sure if SMC bypass procedure is the same as on previous generation board: HOLD the ON/OFF then connect Magsafe, wait 5 secs and release and press ON/OFF?
Not much experience with this board yet. Please advice how to proceed.

THanks!
 

2informaticos

Administrator
Staff member
There should be some fault history.

Do you get PM_BATLOW_L and PM_SLP_SUS_L?
Also post PM_DSW_PWRGD, PM_RSMRST_L, PM_PWRBTN_L.
 

MaxFix

Member
Called the customer. He confessed that it had previous liquid spill on keyboard over a year ago and keyboard was replaced. Worked fine ever since then until just recently. The battery ran out and after that does not go on.
It should turn on with battery disconnected, right?
PM_BATLOW_L - 3.28V
PM_SLP_SUS_L - 3.31V
PM_DSW_PWRGD - 3.41V
PM_RSMRST_L - 3.29V
PM_PWRBTN_L - 3.31V
 

2informaticos

Administrator
Staff member
Did you check for pulse at same time when SMC_ONOFF_L was triggered?
If nothing, looks like PCH/CPU issue.

Please do NOT repeat my questions, just post your answer.
Especially when is one question per post only...
 
Last edited:

Mori3000

New member
Hello

I wanted to make a new post but because i have exactly same model and same symptoms so decided to continue same post.

I found that PM_BATLOW_L is 0v and could not manage what the problem is.

Appreciate your help
 
Top