LG F1200 Service Manual page 59

4. TROUBLE SHOOTING
• Trouble Shooting
- Insert the SIM into socket
- Connect PIF_UNION Jig to the phone, and Power on
• Trouble Shooting Procedure
- Check the power supply
- Check the soldering of SIM socket
- Check the SIM
The soldering of SIM connector
The all paths connected
The SIM Card is OK?
The ABB (Syren) is broken.
START
Insert the SIM Card
is OK?
Yes Yes
to J400 are OK?
Yes Yes
Yes Yes
Change the board.
No No
Resolder the J400.
Resolder the R410,
No No
C417, C418, C419, C420
SIM card is broken.
No No
Change the SIM Card.
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