LG LAS950M - Page 39

2-20
ELECTRICAL TROUBLESHOOTING GUIDE
MAIN Board
FRONT Board
Replace IC101.
(EEPROM)
Replace IC100 or IC501.
Replace LCD.
Check connection
& LCD module.
Check Q403.
Assemble properly.
“HELLO”
Display on LCD
OK?
Signal
EEPROM_CLK / DAT
OK?
Signal
MICOM_UART_TX
MICOM_UART_RX
OK?
6.2 VA,
VCC_5V, F_3.3VA
OK?
Signal
LCD_DO / CLK / STB
OK?
Signal
BL_CTL
OK?
Proper assemble
MAIN, FRONT and KEY
board OK?
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
3C
3C
3C
3B
3A
3C
System part OK.