LG -C300 Service Manual page 82

CHECKING FLOW
Is the connection of
CN403 with LCD connector ok ?
YES
Check the
Voltage Level of C422 is
about Battery voltage ?
(LCD_BL_CTRL signal
is high Level)
YES
Check the Waveform of
EMI filter ?
YES
Does LCD work
properly ?
YES
LCD working well !
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Only for training and service purposes
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4. TROUBLE SHOOTING
NO
Reassemble LCD connector
NO
Resoldering or Replace U402
NO
Resoldering EMI filter.
(FL403,FL404,FL405)
NO
Replace LCD module
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4. TROUBLE SHOOTING
LGE Internal Use Only