Samsung SGH-A500 Service Manual page 16

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