Main Lcd Trouble Shooting - LG D690 Service Manual

3. 12 Main LCD Trouble Shooting

Main LCD control signals are generated by theMT6582.
The path of signalsis :MT6582 ->LCD Module
Press Power-key to turn the Power on
Check the LCD Connector and reconnect
No
No
LGE Internal Use Only
START
is the Main PCB powered?
Yes
LCD display OK?
No
Check the MT6582/MT6323 outputs
RESET(TP1) MCLK(TP2)
Yes
Check the DSV IC outputs
DDVDH(TP3) DDVDL(TP4)
Yes
Check the BL Booster IC output
OVP(TP5)
Yes
Check the EMI Filter signals
CLK(TP6) DATA(TP7,TP8)
Yes
Change the LCD
LCD display OK?
Change the main PCB
No
Follow the Power ON
Yes
No
No
Change the BL Booster IC
No
Change the EMI Filter
Yes
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3. TROUBLE SHOOTING
Trouble-shooting
END
Change the DSV IC
END
Only for training and service purposes