LG -A100 Service Manual page 57

CHECKING FLOW
Mobile SW & TX Module and
LGE Internal Use Only
Check TP1 of SW301
TP1 Signal is OK?
Yes
Check U301 ?
Yes
Control Signal is
TP4, TP7
(VLogic, BS) OK ?
Yes
TP2(High Band),
TP3(Low Band)
Signal is OK ?
Yes
Saw Filter is OK.
EGSM Rx
No
Replace Mobile SW (SW301)
No
Check Main Chip U102
No
Replace FL 301 or U301
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4. TROUBLE SHOOTING
Only for training and service purposes