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If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
- Power LED on, but no picture
- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
Check the cables, connectors and connections.
Take it to a repair shop.
Assuming the system power comes up, does the monitor power come on? Most monitors have a status LED on the front bezel that should show green, orange, or blinking if the monitor is powered on. You can hear CRT monitors power on with a gentle sound, though I can't describe it beyond saying it's the sound of a CRT tube warming up. Make sure the monitor is plugged into a good outlet by testing the outlet with a lamp or any other device that will prove beyond a doubt that the outlet is good. Make sure that the power cord is either permanently attached at the monitor end or that it is seated fully in the socket, since partial cord insertion is the most common failure for monitors with detachable cords.
LCD displays don't make any sound when you turn them on, but they don't have a simple power cord, either. Older LCD monitors are usually powered by an external transformer, which in turn is powered from a regular AC outlet. If the LCD display doesn't show any signs of life, make sure that the cords into and out of the transformer are fully seated. Some transformers are equipped with a status LED to show when they are operating. The power connection to the LCD display is often awkward to inspect, recessed into the back of the display. The important thing is to make sure it is started correctly, then seated all the way.
No Sound From all speakers
Check that the speakers are powered on.
Check that the speakers are connected to the correct ports on the PC. This is particularly important If the customer has both integrated sound and a sound card.
If the speakers have a volume control button - ensure that this is turned up.
Check that the Windows Audio service is running. If this is not running then many of the subsequent troubleshooting steps will not work. Go to Start->Run and type services.msc. Double cliick on Windows Audio. Select Start if possible and check that the Startup Type is Automatic. Click OK.
If the speakers are digital speakers then try forcing the sound card to use digital. Go to Start->Control Panel->Sound and Audio Devices.. On the Volume tab, click the Advanced button in the Device Volume section. In the Volume Control window, below the Play Control Volume slider, click Advanced. If this does not show select Advanced Controls from the Options menu. Select Digital Output Only
If possible try an external audio source like a Walkman, CD, or MP3 player (connect the speakers to the headphone jack)
Check that the volume control in Windows isn't muted or turned too low. See the screen shots below. Go to Start->Control Panel and double click on Sounds and Audio Devices.
Totally darken the room your computer is in, and see if you can see a very-dim image on your computer.
If so, it could be the "inverter" part inside the LCD that has failed (about a $20 part, but will take a technician about $50 to $75 to disassemble/replace/reassemble/test).
Try connecting the monitor to a different computer, to see if the monitor is OK.
Try connecting a different monitor to your computer, to see if the video-card is OK.
Below you will find my recommendations for troubleshooting this issue:
1. Reseat the power cord and verify a good power source.
To reseat the power cord, follow the steps below:
1.1 Power down the system. 1.2 Unplug the power cord. 1.3 Wait approximately one minute. 1.4 Reseat the power cord. 1.5 Verify that the power cord is plugged directly into a known good power outlet.
2. Verify that the monitor is receiving power from a known good outlet and bypass any power strips.
To test the power outlet, perform the following steps:
2.1 Unplug the monitor power cable from the power outlet. 2.2 Plug in a different device, and verify that the device is operational. 2.3 If there is no power try another outlet. Remove any power strips and try plugging directly into the main power outlet.
3. Verify the monitor is powered on and the power button is engaged.
Ensure that the monitor is powered on and that the power button is fully engaged. To do so, check the power LED on the front of the monitor; it should be lit.
NOTE: There are two types of power switches: A mechanical switch characterized by a long travel. You have to push it further and you will hear an audible click. An electrical switch that has a short travel and almost no click.
A lit monitor LED can be any of the following:
* Green * Blinking green * Yellow * Blinking yellow * A combination, such as alternating green and yellow
Any of these states indicate the monitor is receiving power and that you should proceed.
4. Swap power cables.
To try a known good power cable on the monitor, follow the instructions below:
4.1 Turn off a working monitor. 4.2 Unplug the cable from the back of the working monitor, and unplug the cable from the wall. 4.3 Unplug the cable from the monitor in question. 4.4 Plug in the cable that came from the working monitor.
5. Run the monitor self test.
To run the monitor self test, perform the following steps:
5.1 Power off both the computer and the monitor. 5.2 Unplug the video cable from the computer or video card. 5.3 Reseat the power cord to the monitor, ensuring it is plugged into a known-good outlet. 5.4 Power on the monitor.
NOTE: The monitor self test will move around on some monitor models. If the monitor self test moves, allow it to move to the affected areas of the monitor to check for the problem described.
If the Self test failed, it's possible that the monitor is faulty. Contact dell to check if it's still under warranty so they can replace it.