no backlight on screen, tried different cables and new screens, bad MB
I've done what i consider some serious troubleshooting on this Dell E5470.
I've tried 4 different LCD screens, 3 of which were orderd brand new.
I've tried 3 different video cables.
All of the above have resulted in screen displaying basically 0% backlight.
Yes i've used FN+F12 and i can see the bar is maxed out.
BIOS is latest and says backlight is full.
I've connected an external display it and looks perfectly fine.
It seems like the problem MUST be at the motherboard? Is that possible for the motherboard to not let the screen have backlight?
Also for FYI - the E5470 has 1 cable between the motherboard and screen. The part connects to the motherboard, one part to the screen, and one part to the webcam. I've tried unplugging the webcam too just in case, no luck.
There are NOT 2 or 3 different connections on the LCD itself, just one.
Also other strange things;
I've tried 2 brand new 1080p screens that are made for this model, both get zero backlight but can see the screen ok.
I've tried 1 brand new 1366x768 screen that is made for this model but it gets no backlight but additionally only the left side of the screen shows any picture, the right side has nothing (split down middle).
Thanks in advance
Is this a good question?