SOLVED : Philips PFL5507K/12 backlight come on for a second

[frake50]

Hello every one,

i got this set from friends, and it had fault, that when i power it on the LED Backlight come on fro a seond and show on the LCD the sand clock, then backlight go off the TV keep on,

with torch lamp can see the Picture normal as well the sound. RC control working fine.

the power board had integrated LED Inverter from Delta DPS-119AP , i found Diagram of this part, but there no much Value on it.

this why i am here to asking if any of you faced same Problem, and which Part on the PWB fault ? 

Any suggestion appreciated it.