LG KF390 Service Manual page 103

4. TROUBLE SHOOTING
4.12.3 Receiver Path ( Voice Call )
Sgnal Pass : MSM6280 RCV+/- → CN402 → FPCB → Receiver
Start
Check in ëLoopback testíof
Enginnering mode
Disassemble the slide case of Phone
Check the soldering state of Receiver
PAD and the wire state
OK
Check the FPCB State which
has the crack or impair
OK
Check the connector
( CN402 )
OK
Change the Main board
LGE Internal Use Only
Not OK
Re-solder or
relace Receiver
Not OK
Change the FPCB
Not OK
Re-assemble and re-test
loopback test
Check the connector
( CN402 )
Copyright © 2008 LG Electronics. Inc. All right reserved.
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RCV +/-
Only for training and service purposes