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9. Flow Chart of Troubleshooting
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9-1
9-1. Power On
No
Not OK
Not OK
Not OK
Not OK
Check VCC_SYN_2.8V
and VDD3_1.8V of U101
Solder PMIC, U101, C120 and C121
again
END
OK
Check the pin 1 of
OSC100 produces clock
signal
Solder OSC100 again
OK
Check the pin 7 of
U101 produces 13M
pulse signal
Solder OSC100, U101 and C118
again
OK
Is Power On working?
OK
Repeat sequence
Yes
Change battery
Check battery voltage
is higher than 3.3V
Yes
'POWER ON' does not work