Member Avatar for sscottyw3

screen has been going black and move the screen some comes back done this for a while but now all black hook it two my tv and use it as the screen laptop still runs great could it be the ribbon

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Following 's description of a C700 whose internal screen goes black but works on a TV, and the helpful pointers from and , this looks like a hardware fault inside the display assembly. The replies narrowed the field well; below are practical, safe steps to pinpoint the exact component and the usual order of repair.

Try these diagnostics in sequence:

  • Verify external output (already done) to rule out GPU/board problems.
  • Flashlight test: in a dim room, power the laptop and shine a bright flashlight at the LCD from close and at an angle. If you can faintly see the desktop under the light, the panel is receiving image data and the problem is the backlight/inverter (or LED driver). If no image is visible at all, suspect the LVDS/eDP cable or the panel itself.
  • Hinge-angle test: with the laptop on, slowly open/close the lid and watch for the exact angle where the flicker or blackout occurs. Reproducible failure at a particular angle strongly suggests a broken or crimped cable at the hinge.
  • Reseat test: with power removed and battery disconnected, check and reseat the display cable connectors at the LCD and the motherboard. Inspect the cable for visible frays or pin damage.

If comfortable opening the lid, remove power/battery, unclip the bezel (note hidden screws under rubber feet), and inspect the cable path for wear where it bends. Replace the cable first if damaged — it is usually the least expensive fix. If the flashlight test shows a faint image but no backlight, confirm whether the C700 uses a CCFL inverter or an LED driver before replacing parts. Use a multimeter only if experienced.

Cautions: disconnect all power, avoid touching the LCD surface, and take photos during disassembly for correct reassembly. If unsure, a local repair shop can replace the cable/hinge or source a donor screen assembly. This approach follows ’s experience that repeated hinge flexing commonly causes ribbon failure, and it avoids replacing the panel unnecessarily.

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Member Avatar for BigPaw

There are a few things that could cause this, and it was a good idea to connect it to your TV, doing that has eliminated a fault with the integrated video. Like you say, it could be the display cable. The backlight, or the inverter could be likely suspects too. Which model Presario is it?

If it was solely down to the internal display cable, which is typically fed near the hinge mechanism, then you might have seen the display flicker as you moved it or opened and closed it. Did you notice this?

Member Avatar for sscottyw3

yes it did flickered when moved

Member Avatar for sscottyw3

model c700

Member Avatar for JorgeM

I've had a few laptops over the years that have this same problem. In two cases, its been the ribbon cable inside that has been the issue due to the constant crimping of the cable inside. good work on the troubleshooting.

Edited by JorgeM
Member Avatar for BigPaw

It looks like a case of having someone open it up and checking the path and condition of the video cable and reseating the connector.

If feel you want to do this yourself, you can download the which will explain how to disassemble your laptop to the point of checking the cable and connector. Have a look at page 56, it illustrates the video cable routed near the hinge.

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