J2019 Diode Mode Values OK but Black Screen

HI

Iphone 6 PCB 820-3846A

J2019 Connector on PP5V7 LCD AVDDN CONN was 0L.

Changed U1501 and U1503 ow Diode value Reading is OK but still screen Black

Changed FPC Too just in case , same thing

Can any one help me in this case ?

Thanks in Advance

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