LG H990ds - Display Functionality Check

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reserved. Only training and service purposes
LGE Internal Use Only
3. TROUBLE SHOOTING
Image
Checking Flow
When Main display is does not working check CN7501 and TP Voltage.
No
Yes
START
Power On SW
Power is ON?
Power Guide
Main FPCB Connector(CN2)
Connected?
No
END
No
LCD Display OK?
Replace
LCD Module
No
Yes
TP1: +5.5V, TP2: -5.5V,
TP3: 1.8V, TP4 : 3.3V
Yes
No
Yes
LCD Display OK?
Replace
Main PCB
BOTTOM
CN2
TP1
TP2
TP3
TP4
3.14 Display
75