SAMSUNG Proprietary-Contents may change without notice
6-
2
SGH-A500 Flow Chart of Troubleshooting and Circuit Diagrams
2. Initial
3. Sim Part
Initial Failure
Check the U601
END
Yes
check the signal at the
pin 17 of U601 is "Low
→ H igh" when the phone
is boot on
Check the pin 38
of U601 is "High"
Yes
No
No
Check the U401
Check the pin 4 of
OSC202 is around
2.85V
No
Check & resolder the OSC202, R221,
U601
Check the LCD connector
CN302, L CD FPCB
assembly status
Yes
No
Re solder CN302, Re-assembly
LCD F PCB
Yes
Check the pin 1of CN401
Voltage == 3V ?
Check the circuit related to U601
Phone can't access SIM Card
Check the SIM
connector's connection to
SIM Card
Check the circuit around U601 output
and Voltage supply circuitry
Check the circuit around CN401 input
circuitry
End
Resolder to change CN401
Check the circuit related to CN401
Check the circuit related to U601
No
Yes
Yes
No
