My laptop computer's LCD display is'nt working without AC supply.When I run it with AC supply the colors are corrupted, e.g.Instead of white u see cyan, no red color. Suddenly burning smell starts to come out of the air vent.
IF YOU TAKE THE HEATSINK AND FAN OUT AND BLOW THE DUST OUT OF THEM IT MAY HELP AS THE PROCESSOR MIGHT BE OVERHEATING WITH AC POWER. MAKE SURE TO REINSTALL THE HEATSINK WITH THE PROCESSOR PIN PAD IN THE UNLOCKED POSITION THEN TIGHTEN TO THE LOCKED POSITION.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
1. Immediately run PSA. (Make sure laptop is connected to AC Adapter. Leave laptop off. Press and hold on the Fn key then press power button once).
2. Just wait for about 3 to 5 minutes then you might will hear beeping sounds (no display with beeping sounds) this means that laptop is working fine but no display. This might cause by either the video card or LCD.
3. After hearing beeps turn off laptop. (Press and hold on the power button for about 3 seconds)
4. Leave laptop off. Press and hold on the D key then press power button once. If full screen colors appears this means LCD is working fine and the problem is the video card. If no display from the LCD no colors were displayed try the test again just to make sure. If still the same no full screen colors then the problem is the LCD.
Turn the computer off.
Disconnect the AC power supply.
Remove the battery.
Remove the disk-drive.
Reconnect the AC power supply.
Turn the computer on.
Put any "data" disk into the CD-drive.
Does it display the CMOS boot-up display?
Can you hear the PC try to spin that "data" CD, i.e., trying to "boot" from it?
If it works "better" without the disk-drive attached, the disk-drive is the problem.
If the laptop is still working when it is plugged in , then the ac adapter is good and the battery is just bad. If the laptop will not work when it is plugged in then more than likely the ac adapter is bad.
You can determine if the bulb is bad by simply connect a monitor to the fifteen pin AGP port located at the side of your computer usually color blue. If your computer display the desktop on the monitor,you should change the bulb in your computer display.To change the backlight you need to follow these steps :Power off your Toshiba laptop and make sure the AC adapter is unplugged.
Remove the screws on the side of your laptop screen. Once the screws are removed, you can remove the plastic bezel (screen guard).
Pop the bezel out, exposing all of the LCD screen. Pull the LCD screen gently away from the computer by the corner. Be mindful that the screen is still connected to the computer by a ribbon cable.
Remove the tape over the ribbon cable where it connects to the screen, and gently pull the cable to disconnect it.
Turn the LCD face down, and remove the piece of tape that holds the top metallic foil against the back of the LCD.
Lift the metallic foil to expose the backlight. Remove the single screw at the end of it that holds it in place. Unclip the wire at the end of the backlight from the inverter (power source to the backlight), and remove it from the LCD. Replace it with the new backlight (available at any electronics store or online), and reassemble the device the same way you took it apart.
Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board. The
LCD cable transfers data signal from the motherboard & video card
to the LCD screen. It also supplies high voltage DC power to the screen
inverter board. The screen inverter board works as a power supply for
the backlight lamp mounted inside the LCD screen. It converts low
voltage DC power to high voltage AC power needed for the backlight lamp.
What voltage is your mains supply?
The laptop's adapter should be a multi-voltage type 110 to 240 volts input.
If your mains is 110 volts AC then the 220 volt AC LCD projector won't work unless you connect it to a step up transformer (110 to 220 volt transformer).
If your mains supply is 220 or 240 volts then both the laptop and the LCD projector will work without any problems.
-if you switch the computer on and it boots up and you hear the windows sound, this could be a possible video problem or motherboard problem -run the diags on the LCD, while the computer is off, press and hold "D" then press power button at the same time, if you see the colors red blue green without any problems then it is a motherboard or video card problem -another method to run the test is while the computer is off; preess and hold Fn then press power button, let the test run; when you see the question were colour bars displayed, press N, if you see the colors red blue and green without any problem then it is a motherboard problem or video card; otherwise it is an LCD problem -to toggle display on the external monitor press Fn then F8
I think there is some severe problem in the VGA of the laptop, that is not supporting your LCD. There may be some thing relating to a very sensitive golden color strip in the laptop that is used to VGA signals. If you have opened the laptop for repairing then it can be a issue. Better to try another VGA first and then tell me what happened.