Main Lcd Trouble Shooting - LG D405 Service Manual

3.11 Main LCD Trouble Shooting

Main LCD control signals are generated by MSM8226
START
Disconnect and re-connect
LCD Connector in Lower FPCB(CN7100)
Yes
LCD display OK?
LCD back light is ON?
Check LCD Power in Main Board
TP1(DDVDL_-5.5V)
TP2(DDVDH_+5.5V)
Replace component U9301
End
LGE Internal Use Only
No
Yes
No
Yes
No
TP6, TP7, TP8
Filter Solder status is normal?
Yes
Check LCD circuitswithout LCD
module TP3(VREG_L15_2V8)
TP4(VREG_L8_1V8)
TP5(PMIC_LED_A)
No
Replace component U4100
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3. TROUBLE SHOOTING
Rework TP6, TP7, TP8
No
Yes
Replace LCD Module
Only for training and service purposes