HP dv6 backlight on screen doesn't turn on after the "standby mode", although external hdmi does not follow the work

OK so my sister has been using my computer last night, when it was made using it she just closed it witch automatically put in mode 'sleep' and gave it back to me. later that night I opened this herd all the normal sounds of the laptop but the backlight does not turn. the screen looks completely black, except that I see a darkness where the hp logo lights across the screen in the lower right corner. in fact when I use the scanner of thumb to activate windows I can see the date and time, dimly lit in this corner and can move the mouse on and see. I connected my laptop to my TV via hdmi and it works absolutely fine, which is how I'M writing this issue right now. I tried to update the drivers for my graphics card, but that did nothing. It's just the backlight does not turn no more. is it far from accidentally turn the backlight on or off? If I have to completely replace the monitor or just replace the lighting? any suggestions?

model: Hp Dv6z

product: A0V78AAR

Windows 7 64 bit

Below is the list of compatible signs:

part number 665334-001

15.6-inch high-definition view bright LED display SVA - Raw Panel only

part number 665335-001

15.6-inch FHD anti-glare LED display WVA - Raw Panel only

Here is the Service Guide. See page 93 and 101.

Tags: Notebooks

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