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4.17 Main LCD trouble
Main LCD control signals are generated by STN8810. Those signal's path are :
STN8810 -> 70-pin main connector(CN201 in main PCB) -> 70-pin connector (CN102 in slider FPCB)
-> 40-pin connector (CN101 in slider FPCB) -> 40-pin connector (CN101 in SUB PCB) -> LCD zip
connector (CN100 in SUB PCB) -> LCD Module
Change the Main BD
Change the slider FPCB
& re-check
Change the SUB BD
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Only for training and service purposes
START
Press END key
to turn the power on
Is the circuit powered?
Yes
Disconnect and reconnect
70-pin , 40-pin B to B,
and 35-pin zip connector
LCD display OK?
No
Check AP_VDD_LCD_2.8V, LCD_NRESET,
LCD_DATA(0) in Main BD
No
Check the same signal
No
Yes
Change the LCD module
No
4. TROUBLE SHOOTING
No
Follow the Power ON
trouble shooting
Yes
in SUB BD
Yes
Display OK?
No
- 149 -
Yes
Yes
The LCD works
End
LGE Internal Use Only
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