I'm familar with the logic boards that existed before usb C. This data bus should be working with or without a battery? u7000 was replaced and the resistance of r5380/r5381 both measure around 2k. ppdcin is 20v and ppbus is 0v and I think it's because smbus_smc_5_g3_sda is missing. the battery has a charge and the data bus comes back when it is attached. this seems like a pmic issue
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820-00239 smbus_smc_5_g3_sda is 0v when the battery isn't attached
- Thread starter kjchatman
- Start date
SCL/SDA lines of battery bus must have very similar reading (less than 1% difference) in diode mode to ground.
Also voltage should be 3.3V approx, w/ and w/o battery connected.
Also voltage should be 3.3V approx, w/ and w/o battery connected.
I hope you didn't measure diode mode with power applied.
There is big difference; denotes a problem on SDA line.
I was waiting voltage level on both lines too.
I also asked you to measure in 2 scenarios.
How do I know which values posted???
Was without battery?
There is big difference; denotes a problem on SDA line.
I was waiting voltage level on both lines too.
I also asked you to measure in 2 scenarios.
How do I know which values posted???
Was without battery?
The pull-up resistors for battery bus are connected to MLB.
No problem to measure with battery, if charger is not connected.
Remove D6950 and check again.
No problem to measure with battery, if charger is not connected.
Remove D6950 and check again.
There is no relation between D6950 and SYS_DETECT_L.
SYS_DETECT_L is pulled down to ground (as needed) through R6950.
D6950 is only used as spike protection for battery data bus.
D6950 is only used as spike protection for battery data bus.