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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
LGE Internal Use Only
Check
the Voltage Level of
FB305 (TP1) is about Batt. voltage ?
(LCD_BL_CTRL(TP2)
Signal is high
Level)
4. TROUBLE SHOOTING
START
NO
NO
YES
Check the Waveform of
EMI filter
Resoldering or Replace U304
NO
Resoldering or replace EMI filter.
(FL302,FL305,FL306,FL308,FL309)
Does LCD work
properly ?
Replace LCD module
LCD working well !
YES
CHECKING FLOW
NO
Check the Waveform of
Data pins on CN304
(LCD_RS, LCD_CS, LCD_WR)
Replace Main board.
NO
Check the connection of
LCD and CN304
Reassemble LCD to CN304
YES
YES
YES