Circuit Diagrams - Samsung SGH-Q100 Service Manual

5.SGH-Q100 Flow Chart of Troubleshooting and

Circuit Diagrams

5-1. Power ON
'POWER ON' does not work
Check the current
consumption more than
100 mA
Check the
Battery Voltage more
than 3.3V
Check the pin
4 of U101 is more than
2.85 V
U101 pin 31,35,36
= 3.0V
Check the clock signal
at pin4 of U801
Freq=13MHz ?
Vrms
Vpp is around 900mVpp ?
Check the initial operation
END
Y
Y
Y
Y
N
Y
300mV ?
Y
Y
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N
Charge the Battery
N
Check U101 and C112
N
U101 pin 1
= 1.8V
Y
Check the clock generation circuit
N
(related to OSC801 and U801)
5-1
Check U101 and
N
C103, C104, C120