Samsung SGH-Q105 Service Manual page 17

SGH-Q105 Flow Chart of Troubleshooting and Circuit Diagram
5-2. Initial
Initial Failure
Check the
signal at the pin 17 of
U101 is "High"
when the phone
is boot on
Check the pin 18
of U101 is "High"
Check the pin 4 of
OSC801 is around 3.0V
Check the pin 4 of
U801 is around 3.0V
Check LCD connector CN201,
and resolder bridge
END
Y
Y
Y
Y
Y
Y
SAMSUNG Proprietary-Contents may change without notice
Check U101, U201
N
Check the U701
N
Check the soldered status of
N
OSC801, R801, U101
Check the soldered status of
N
OSC801, U801
5-2