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Re: no backlight on main screen
Most chances are that ur phone flate cable has broken raplace it. but before to change u have to unplug the cable from connector clean it and reattach from both side board and lcd. if not ok then change cable.
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Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board. The
LCD cable transfers data signal from the motherboard & video card
to the LCD screen. It also supplies high voltage DC power to the screen
inverter board. The screen inverter board works as a power supply for
the backlight lamp mounted inside the LCD screen. It converts low
voltage DC power to high voltage AC power needed for the backlight lamp.
Hi first thing to do here is to see where the problem lies. use a vga / monitor lead from your laptop to an external monitor or lcd/plasma tv in pc mode and by pressing fn and your monitor switch key think its f5 you should be able to determine if your screen is at fault, a common problem is the screens inverter or backlight bulb, if you manage to get an image on your external source then you its sure to be screen related wether it be the inverter/backlight/or even your internal screen lead this process can save money and time, you would then need to test the inverter to see if its this, the inverter is normally the cheaper option as the backlight can be a long tricky process.
Might be ur controller inverter board or main video backlight board.Ur video does show up a picture right?That the only two boards that related to video.My adviced to u is buy the controller inverter board first tried that,if not work return it for money back,but must pay restocking fee.That the board between the power supply and main backlight video board.Than u know for sure it the main video backlight board.
It is a very common problem caused due to loose connction from the MCU to the Screen. MCU ( main control board ). Also check the hinges. They sometimes crack. Replace them in case of hinge problem. Thank you.