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820-00281 no power
- Thread starter Kyle93
- Start date
Check all resistors in that area.
Don't forget to inspect U2890.
All ports have the same behaviour?
Do you get 1V1 LDO on each chip?
Don't forget to inspect U2890.
All ports have the same behaviour?
Do you get 1V1 LDO on each chip?
Reball U3100/200...
Test with known good batery, which holds some charge.
Check if USB-C input switch to 20V.
Let see if board tries to start then.
Check if USB-C input switch to 20V.
Let see if board tries to start then.
CPU is not involved in the power switching process.
Any life sign if you trigger SMC_ONOFF_L?
Use R5226 pads, instead of power button.
Use R5226 pads, instead of power button.
You have battery connected, forget the charger; even you keep it connected too.
The board is powered from battery at this moment.
Check for pulse at the big coils...
The board is powered from battery at this moment.
Check for pulse at the big coils...
With battery connected, check if SMC_ONOFF_L stays high?
If yes, then trigger it (as above described) and check for pulse at PM_RSMRST_L and PM_PWRBTN_L.
If yes, then trigger it (as above described) and check for pulse at PM_RSMRST_L and PM_PWRBTN_L.
Check U7800 (7 OF 10) LDO outputs.
Check USB activity and external video.