MacBook Pro Unibody - No backlightan 820-2936

[Sanket123]

Hello guys I have an 820-2936 Macbook pro late 2011 13'' i5 A1278


I Have chimes and display but unable to get back light

I can see the image using an flashlight from behind


I have checked the display by connecting to an working screen, but it too doesn't have backlight


board has LP8550 WLED driver


and it doesn't boost output


I have an feedback of at

PPVOUT_SW_LCDBKLT_FB probe 613 12.5v


I am posting all the readings in the pictures



Kindly guide me to help me find what the problem is,

am i supposed to replace LP8550 .


Please guide me


Thanks in advance