HP Pavilion G7-2022US: no backlight on the LCD of the G7-2022US screen, but the video can be seen on external monitor

I'm trying to fix the HP Pavilion G7-2022US laptop from a friend, the number of product B4Z74UA.  The laptop starts in Windows 7, but the screen is dark even during the BIOS or by MAIL.

Symptoms:
Laptop turns on but the LCD screen stays dark (during the POST and when Windows loads)
With the help of a flashlight on the display shows that the video is present but the backlight does not work
The video can be seen on an external display connected via VGA cable

What I've done so far:
Installed a new LCD screen cable
Installed a new LCD screen
Update BIOS
Updated graphic driver
check that the lid close switch works (small magnet under the screen that signals the motherboard to turn off display when the lid is closed)
Static discharge by keeping the button depressed with battery and power adapter disconnected
Checked if RAM could be bad

I tried all the solutions above, but the screen remains dark.  The only way to use the laptop is to connect it to an external monitor.  I disassembled the laptop together and there is no inverter part to replace.

I don't know what else to do.  Any suggestions?

I finally found the culprit.  A circuit of (possibly a fuse mounted on surface) on the motherboard next to the display cable connector is visibly burned.  The circuit is too damaged to solder and close the connection.

Tags: Notebooks

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