Only For Training And Service Purposes - LG GM200 Service Manual

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