LG -A258 Service Manual page 90

CHECKING FLOW
Is the connection of
CN102 with MAIN connector(CN300)ok ?
YES
Is the connection of
CN102 with LCD connector(CN102) ok ?
Check the Voltage Level of
TP1 is about Battery voltage ?
YES
Check the Waveform of
EMI filter( TP4, TP5, TP6, TP7) ?
YES
Check the Waveform of
Data pins on CN102 ?
YES
Does LCD work
YES
LCD working well !
LGE Internal Use Only
START
properly ?
NO
Reassemble FPCB
with MAIN connector
NO
Reassemble CN102
with LCD connector
NO
Resoldering or Replace U202
NO Resoldering EMI filter.
(FL303,FL304,FL307)
NO
Replace FPCB
NO
Replace LCD module
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4. TROUBLE SHOOTING
Only for training and service purposes