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This could be one of two things, it is either the inverter (this generates high voltage to run the back light) or it could be the back light itself.
As you have suggested, it could just be a loose wire or cable.
Replacing the inverter is relatively straightforward as it is located at the bottom edge of the LCD screen behind the plastic case. The backlight is usually part of the LCD screen and you would usually be better replacing the screen entirely.
To get at either of these components to check cables/wires etc, you will need to disassemble the screen case of the laptop, this is fairly simple if you are comfortable with disassmbling laptops.
A brief overview of the screen replacement process is below, instructions 1-4 show how to remove the case to access the inverter and cables:
1. Power off your laptop. Turn the laptop upside down so that you can see the bottom side of the laptop's case.
2. Depress the battery release latch and lift the battery and laptop ac adapter out of the laptop. Flip the computer back over and open up the LCD screen to a 90 degree angle.
3. Pull off each of the rubber buttons located along the edges of the Acer Aspire 5535 Screen. Remove each of the screws underneath the buttons with the Phillips-head screwdriver, remove keyboard.
4. Insert your fingers underneath the cover of the Acer Aspire 5535 Screen. Work your fingers around the edges of the cover to unlock it from the screen. Pull the cover off the screen and set it aside.
5. Locate the inverter board at the bottom edge of the Acer laptop screen . Disconnect the cables at the right and left end of the board that connect to the Acer Aspire 5535 Screen. Remove the screw holding the inverter board in place and then lift the board off the LCD screen.
6. Tilt the screen slightly towards you until you can see the strip of tape holding the video cable. Pull off the tape and then disconnect the video cable from the laptop case.
7. Remove the Acer Aspire 5535 LCD screen from the case. Set the new screen onto the case and reattach the video cable and tape strip. Position the replacement inverter board at the bottom of the screen and attach the screw.
8. Reconnect the inverter board's cables. Pop the plastic cover onto the Acer Aspire 5535 LCD screen and reconnect the screws. Set the rubber buttons over the screws. Reconnect the battery.
9. Turn on the laptop. Wait for the manufacturer's logo to appear on the screen to ensure the display was replaced properly.
Below is the link to your service manual and a picture of the front edge of your laptop. Look at the illustration, the button marked number 5 is the wireless button, the button marked number 4 is the bluetooth activation button. These buttons may appear clear, but remember the wireless is next to the audio jacks.
Hi there. Remove the laptop battery and the AC power supply, open the lid as far back as you can take it. Get a small flat headed screwdriver, now, you have to take off the keyboard bezel, this is the strip of plastic above the keyboard with the power button on it, the best way to remove it is to start by the on/off button by gently prying the bezel up from the lid hinge, once you have one side out gently pull it up using your fingers, it will unclip and lift away. Next you have to remove 2 screws from the top of the keyboard, these should be visible to you, once the screws are out carefully lift the keyboard up, you will see a ribbon cable that is connected to the motherboard, gently pull the tab up on the connector that the ribbon cable sits in and it should release it and you can now remove the keyboard and replace it. To re-assemble just follow my direction in reverse. Please post back with the results and for any additional advice if needed.
I have the same problem with a Hitachi CP-X345 Multimedia Projector. My Acer Aspire 3630 Laptop cannot be detected but it works without incident with a Dell Vostro 1500; just plug and play. Desktop settings to second screen doesn’t seem to help.