LG VX5400 Service Manual page 97

START
Check the signal level of SW_EN
At C427. Is this level about 0V(low)?
Check the signal level of
NC1, NC2 of U402
Check wheter the internal lines of
FPCB are OPEN or not between the
pin 62/63 of 64 pin connector and
The receiver pad RCV+/RCV-
Check the signal at RCV+/RCV_
Receiver will work properly
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Only for training and serving purposes
YES
NO
YES
NO
YES
NO
YES
NO
Checking Flow
Checking Flow
Check the soldering at
C427
YES
Replace the U402
Replace the U402
Check the soldering of receiver
YES
-97-
Replace MSM or Main B/D
NO
Resolder C427,
Replace Receiver
NO
Resolder receiver
LGE Internal Use Only