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Help me please?..................Yes
An external monitor works Good. This way you know the problem is either the Video Cable, or inside the Display Assembly.
With the Compaq Presario C700 series of Notebook PC's, the Video Cable connects to the motherboard; in an area under the Keyboard, and Switch Cover. (Above the F4 key)
It then leads under the left Hinge, and up into the Display Assembly. From there a small cable branches off, and connects to one side of the Screen Inverter. The main part of the Video Cable, goes on to connect to the back of the LCD screen.
The large connector on the Right side, connects to the back of the LCD screen. The smaller connector shown at Bottom connects to the motherboard. The small cable leading up to the Top/Left, connects to the screen Inverter.
Just from repeated normal opening, and closing of the laptop; the Video Cable may become pinched, and pulled on. Sheath of Video Cable also hardens over time, and this also adds to the equation.
However, this laptop has been dropped. There's a real good chance of a problem with the Video Cable.
Pulling on it can lead to the connections coming loose. Motherboard side, screen Inverter cable, and LCD screen side.
Procedure is to go through the various connections, and PHYSICALLY check them. Try to plug them in tighter.
Motherboard connection: 1) Remove ALL power. Remove the AC adapter (Charger), and Battery.
2) Disconnect the Keyboard, HOWEVER do not disconnect the Keyboard Cable from the motherboard.
Once Keyboard is removed from Palm Rest Cover, take the LCD screen side, and roll the Keyboard over. Bottom side up, lay on Palm Rest Cover.
3) Now remove the Switch Cover. The Switch Cover is the wide strip of plastic, above the Keyboard, and below the Display Assembly.
The Switch Cover is just that........a Cover. No wires attached.
Physically check motherboard connection. Reinstall power. Turn laptop on. No change? Remove ALL power again.
LCD screen side connection and screen Inverter connection: 4) The plastic frame in front of the LCD screen, is the Display Bezel. Remove it.
Right behind the Display Bezel, and mounted on the bottom/middle of the Screen Frame; is the screen Inverter. Just physically check the screen Inverter connection, but go on to the LCD screen side connection.
The LCD screen is an assembly of layers. These layers are held in the factory set position, by a metal Screen Frame. Resembles a picture frame.
Attached on either side of the Screen Frame, are Brackets. The brackets are attached to the Hinges, and the whole assembly is just referred to as a Hinge.
There are screws that hold the Hinge brackets to the Screen Frame. There are also screws that hold the Screen Frame together. Be SURE as to which screws you remove. You do not want to remove the Screen Frame screws.
Remove the screw that hold the Hinges to the Screen Frame. Tilt the Top of the LCD screen forward towards you, and physically check the LCD screen side connection; of the Video Cable.
Lay the LCD screen back, put a screw in on each side, to temporarily hold the LCD screen in place. Reinstall all power. Turn the laptop on. Still no joy?
Remove the Video Cable. The Video Cable needs to have a continuity test performed, with a multimeter set to OHM's. (1K) Every wire in the Video Cable is checked. No reading on a wire indicates a stretched/broken wire.
An assistant should also be used, to gently wiggle the Video Cable while checking. An intermittent reading on the multimeter indicates a stretched/broken wire.
Or take the Video Cable down to the nearest small computer repair shop, and have the resident tech check it for continuity. Should only be a coupla' bucks.
The Video Cable MUST be ruled out, before going on........
5) Video Cable checks out OK, or a replacement is used; and still no display on laptop's internal monitor, the screen Inverter is next in the diagnosis.
To test a screen Inverter requires a sensitive multimeter. Read fairly expensive,
You have to remove the keyboard. Most laptops have the keyboard screws at the bottom or underside of the pc and right next to the screw hole is a little keyboard picture thing or illustration that tells you that screw is to hold down the keyboard. once the keyboard is removed, you can easily get the LCD screen wires disconnected.
To be exact there are six models of Compaq C700 laptop.
to identify the model, turn you laptop upside down and read the details on the sticker.
Compaq C700 Main
Compaq C700 CTO
Compaq C700 EM
Compaq C700 ET
Compaq C700 LA
Compaq C700 CTO
Compaq C700 XX
1. Select your OS
2. Scroll down, drivers are displayed alphabetically
Hopefully this helps.
Thank you for posting..
On every laptop I've seen there's a key combination to toggle through display modes. On the function keys F1, F2, etc one of them should have a couple of squares which are supposed to be monitors, hold down the fn key and press this key a few times to toggle through the options until you get to what you need. Usually it's fn+F6 as I recall.