820-0016 MISSING PM_BATLOW_L

huzeafa

Member
Good day guys

am currently busy on a board, and I am struggling to get the PM_BATLOW_L signal, I have replaced the known good SMC but no changes, the same SMC works okay on a different board and I get PM_BATLOW_L, but on this board, I don't have it, other SMC output signals are present and my ppbus voltage is properly regulated by the SMC too. I checked for a short to ground and there's non, is there somewhere I need to check for this signal? without the signal being created, am unable to move forward, please help.
 

2informaticos

Administrator
Staff member
Be sure to use original Magsafe 2 charger; no matters 45-85W.

Do you get amber light and battery is charging?
Steady 3V3_S5/SUS?
Check R1410...
 

huzeafa

Member
@2informaticos, 3V3_S5/SUS is steady, R1410 has 3.3V on pin 1 but less than 1V on pin 2, when I disconnect the resistor from the PM_BATLOW_L line , i got 3.3V and there's no short to ground
 

2informaticos

Administrator
Staff member
"Do you get amber light and battery is charging?"

Try to start with charger and battery, both connected.
 

huzeafa

Member
Thank you guys, I apologize, for my mistakes, when @2informaticos asked this (3V3_S5/SUS is steady) I did check but did not hold the probe point longer to see that after sometimes the voltage drops and then go back up, so I resolved that, and the board is now resolved.
Thank you so much @2informaticos and @Gurmon.
 
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