Question about HP Compaq 6715b Notebook

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Don't have light on LCD screen

When I turn on the laptop everything is OK except for display. Display remains dark, but over time you can see the images on it. On the external monitor is OK picture. CCFL and inverter is OK. ADJ and ENA pin on the inverter and one is 0V. The power pin (6,7) is 19 V.

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You can RUN the software diagnostic coming with the computer or download the s.diagnostic from your computer supplier.
However you must restar the computer HOLD the keys CTRL+f11 or f12 depend of your mark, and go to restore at factory default and try it.
If the problem persist, is time to go to the repair shop, control board defective or screen faulty.
God bless you

Posted on Jul 23, 2013

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Does it sound like the laptop booted up except the screen is black? Do you hear the fan running and the hard drive spinning? If so try the steps below.
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When you turned it on does it seem like the laptop booted up all the way except the screen is black? Do you hear the fan running, the hard drive spinning and everything seems to be ok except the screen is black?

Shine a flashlight on the dark screen to see if you barelysee the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can beany kind of monitor even the old big fat crt monitors as long as it has a vgacable to connect to your computer's vga port. If so that proves yourvideo card is ok. The video will show on most systems when you rebootwithout you having to do anything. Some systems will require you to hit the FN(Function key) + F1 thru F12. Hold down the FN key then hit the correctkey for displaying on the monitor (F1 thru F12). The correct key willnormally have CRT/LCD on it or it will have the icon of a display.

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If the power totally fails (i.e. power is cut off, LEDs turn off, fans stop, ... etc), then this more likely to be because of a short circuit developing in a failing semiconductor component, or a power supply problem.
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1. When you turn on the laptop, the screen lights up for a short period of time and then goes dark. You still can see an image but it is very dark, almost invisible and definitely not usable. When you restart the laptop, the screen lights up and then goes dark again. The laptop works fine with an external monitor.
2. Your laptop turns on but the screen remains dark all the time. You still can see a very dim image outline. The laptop works fine with an external monitor.
3. The laptop screen works fine for hours or even days, but sometimes it goes very dark as it mentioned above. When you restart the laptop, the screen works fine again.

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