LG LG-P715 - Main LCD Trouble

4. TROUBLE SHOOTING
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4.16 Main LCD trouble
Main LCD control signals are generated by MSM8225.
Those signal’s path are :
MSM8225 -> LCD Module
Is the circuit powered?
Press POWER key to turn the power on
Yes
Yes
Yes
Yes
END
Start
Check VREG_LCD_2.8V(TP1)
VREG_MSME_1.8V(TP2) is OK?
LED_A(TP3), LCD_RESET_N(TP4) is High?
LCD_VSYNC_O(TP5) is 60Hz?
MIPI Signal ESD Filter (FL5002,FL5004)
LCD display OK?
LCD display OK?
No
No
No
No
Change the LCD module
Change the Main BD
The LCD works
Disconnect and reconnect
LCD connector
Follow the Power ON trouble shooting