overshoot
Member
820-00281 Not charging, 5V 0.02A on charger only (battery unplugged), 20V 0A with battery plugged, shows sign of battery flat.
Should be a simple problem to fix but...
Each USB-C port shows 5V with 0.02-3A consumption. No port power cycles.
When checking rails around the USB-C chip, I'm getting my 1.1V, 1.8V, 3.3V and 5V as expected.
PPBus does not have a short, .4V drop in diode mode.
I am getting 0.04V on PPBUS, floating.
I went ahead and replaced the SMC from a donor thinking there might be communication issue on those BI lines. No cigar.
I also went ahead and replaced the ISL. No cigar.
However I got that ISL 9239C0 from Aliexpress (original being 9239HI) but read that the 9239C0 should work just fine.
Though, noob question here...
Shall I be getting 20V before getting PPBus?
I assume yes and that's why I believe I went on the wrong road chasing no PPBus when I should be chasing why I am not getting 20V first.
Any good read on the Wiki or idea where to look at please?
Also I assume a short on some rail down the road is not on the list since I am getting the battery sign showing up with the battery plugged in.
Should be a simple problem to fix but...
Each USB-C port shows 5V with 0.02-3A consumption. No port power cycles.
When checking rails around the USB-C chip, I'm getting my 1.1V, 1.8V, 3.3V and 5V as expected.
PPBus does not have a short, .4V drop in diode mode.
I am getting 0.04V on PPBUS, floating.
I went ahead and replaced the SMC from a donor thinking there might be communication issue on those BI lines. No cigar.
I also went ahead and replaced the ISL. No cigar.
However I got that ISL 9239C0 from Aliexpress (original being 9239HI) but read that the 9239C0 should work just fine.
Though, noob question here...
Shall I be getting 20V before getting PPBus?
I assume yes and that's why I believe I went on the wrong road chasing no PPBus when I should be chasing why I am not getting 20V first.
Any good read on the Wiki or idea where to look at please?
Also I assume a short on some rail down the road is not on the list since I am getting the battery sign showing up with the battery plugged in.