LED Backlight Quit. How to Diagnose?

LED backlight on Presario CQ61 (same as HP G61) died after
year and half of operating well.  Screen is completely dark.
Proper image is present (using flashlight) and external monitor works ok.
Same symptoms during BIOS setup or Safe Mode so it's not a Windows
problem.
Have reinstalled video driver.  No change.
Maintenance and Service Guide says there's no "inverter" that
can be replaced and I doubt any of the LEDs have burned out.
Product: VU088AV or   VL867AV
Model: CQ61z-300
P/N: 10P8B500428
Windows 7 Professional (64 bit)
I have some experience repairing laptops, using voltmeter and soldering.
Any suggestions?  Would prefer not replacing entire display, or do you
think it is the mother board?
Thanks

It is the display. If it is an LED screen there is no inverter. The LED screens look nice and use less power but they do not use an inverter to change the motherboard current to higher voltage as with LCDs. When it goes dark the only repair is a replacement. You can rule out the video card/motherboard 100% by trying it connected to an external monitor. If it shows OK externally then you are positive it is the display panel.

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