LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.14 Main LCD trouble
Main LCD control signals are generated by MSM6280. Those signal’s path are :
MSM6280
→
Z ORAN (Multimedia Chip) -> 40-pin connector(CN300 in Main PCB) -> 40-pin connector
(in LCD Module)
The LCD works
START
Press END key
to turn the power on
Is the circuit powered?
Follow the Power ON
trouble shooting
LCD display OK?
Check LCD_VDD_2.8V, LCD_RESET_N,
LCD_DATA[0~15] in Main BD
No
Yes
Yes
No
Disconnect and reconnect
40-pin B to B connector
Change the Main BD
No
End
Yes
Display OK?
Yes
Change the LCD module
No
Содержание U990
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