client sent me this device only states not turn on. It seems never been attempted.
At the beginning tried with charged battery, not turning on(no backlight, black screen)
I have checked M92T36, no short, BQ24 also ok since 15v goes to BQ ic and 4.2v present.
prob around no luck finding short. The only thing goes wrong IMO is the MAX 77621 under emmc does not have 0.8~0.9v output. No short around that max, and the other max77621 has 0.8v output.
I have tried reball the suspected max77621 but no difference,even replaced it from another donnor board, no difference. Reball MAX77620, no difference.
Any thought is welcome.