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SGH-D100/D100A Flow Chart of Troubleshooting and Circuit Diagrams
2. Initial
Check the signal at the
OSC801 is around 2.8V
Check LCD connector CN201,
3. Sim Part
Phone can't access SIM card
Check the circuit around CN101
Check the circuit around U601
and vlotage supply circuitry
Initial Failure
Yes
pin 11 of U102 is
"High" when the phone
is boot on
Yes
Check the pin 22 of
U102 is "High"
Yes
Check the pin 4 of
Yes
and resolder bridge
Yes
END
Yes
Check the pin 1 of
CN101. voltage 3V ?
Yes
Check the SIM
connector's (CN100)
connection to SIM
card
Yes
input
circuitry
Yes
output
Yes
END
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No
Check U102
No
Check the U701
No
Check the soldered status of
OSC801,C801,C802,R803,C803,C804
Check the circuit related to
No
U102
No
Resolder or change CN101
No
Check the related circuit of
CN101
No
Check the related circuit of
U601 and U102
2-2
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