Main Lcd Trouble - LG KT610 Service Manual

4.17 Main LCD trouble

Main LCD control signals are generated by STN8810. Those signal's path are :
→
STN8810 70-pin main connector (CN400 in main PCB)
→
FPCB) 50-pin connector (CN103 in Main-Folder FPCB)
Check AP_VDD_LCD_2.7V, LCD_NRESET,
Change the Main BD
No
Change the Main-Folder FPCB
& re-check
No
Change the Backlight Driver IC
in Key PCB
No
LGE Internal Use Only
START
Press END key
to turn the power on
Is the circuit powered?
Yes
Disconnect and reconnect
70-pin , 50-pin B to B
connector
LCD display OK?
No
LCD_DATA(0) in Main BD
No
Check the same signal
in Main-Folder FPCB
Yes
Yes
Change the LCD module
→
70-pin connector (CN400 in Main-Folder
→
LCD Module
No
Follow the Power ON
trouble shooting
Yes
Yes
Display OK?
No
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Yes
Yes
The LCD works
End
Only for training and service purposes