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53772
February 4th, 2016 07:00
No video
I have an inspiron 15 7000 series, that powers on but will display no video. The monitor backlight comes on and funny thing is that connecting an external monitor works and I can use the touch display on the laptop screen to move the mouse on the external monitor. So do I have a bad lcd display if the backlight and touchscreen components work or is it another issue?
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ejn63
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February 4th, 2016 07:00
Power off,press and hold the D key though powerup. Can you see a series of cycling colors on the internal screen?
IdahoBusTech
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February 4th, 2016 07:00
Interesting, so I did hold down the D key and I do see the cycling colors on the monitor.
Booting normally I still do not see any video. Not Dell logo, no POST of any kind.
ejn63
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February 4th, 2016 07:00
That means the display is OK. The prime suspect would be the wiring harness that runs between the mainboard and back of the display panel -- that would be next to replace.
If that doesn't solve the problem, it's likely a video chip failure (they can and often do fail in such a way as an external monitor functions properly while the internal display does not).