820-3437 - No Power Button


New member
I have a 820-3437 with no power button. The unit powers on when the charger is connected with the battery plugged in, light goes amber, fan spins and stops 3 times then the system powers up and works as expected. I cannot turn it off or on using the power button. I disconnected the IPD Flex and shorted SMC_ONOFF_L to ground but it still doesn't work. I am lost here as the circuit doesn't have alot of components but I still can't find the fault. Any help would be appreciated.


New member
Woke up this morning to find it dead. Now no power at all. Orange light on. SMC_Reset_L present at 3.4V but doesn't seem to go low. Checked R5100 and R5127 and they are both okay.


PPBUS_G3H present??? if it power on when charger is plugged in even if battery is present maybe battery is not detected..... water damage???? check sense resistors and traces from ISL...


Staff member
1) History history history. We need more history!

2) How does R5170 work? What do you measure here/

3) Does PM_PWRBTN_L move down towards 0v when you press the power button?

4) What power rails aren't/are present?