LG lg-d821 User Manual

3. TROUBLE SHOOTING
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Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.10 Main LCD trouble
Main LCD control signals are generated by MSM897
Follow the power ON
Trouble shooting
Change the
Lower FPCB
Disconnect and re-connect
LCD Connector in Lower FPCB(CN16001)
No
No
No
START
LCD display OK?
Check LCD Power in Main Board
TP1(DSV_EN)
TP2(+5V5_DDVDH)
TP3(-5V5_DDVDL)
TP4(WLED_A)
Check LCD Power in Lower FPCB
TP5(+3V1_VREG_L22)
TP6(+1V8_VREG_LVS3)
TP7(+5V5_DDVDH)
TP8(-5V5_DDVDL)
Change the Main Board
The LCD works
Change the LCD Module
END
Press PWR key turn the power on
Yes
Yes
Yes
Yes
Is the circuit powered?
No

LG lg-d821 Specifications

General

Brand	LG
Model	lg-d821
Category	Cell Phone
Language	English