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yes the led backlight for whatever reason is not functioning and that is the root cause of your problem. Unfortunately to find a replacement led backlight is tough as the backlight is normally fixed with the lcd panel and has to match the voltage and all that stuff with motherboard. and if that doesn't match you might short the tv itself. this case is as good as getting a replacement lcd panel.
Open and look at power supply board for capacitors which are "balooning" or deformed in any way. These look like cylindars on the board. These tend to dry out and make what you are describing occur. Replacing them usually fixes about 80% of the problem you are describing. Those parts run about $0.25 to $0.75 each.. well worth trying, right?
Probably not. This is most likely either a backlight going out, or an inverter board going bad, or other internal component (costs $100+ to replace by a professional). Not worth it to fix in most cases, unless you have an extended warranty, or a local repair shop with really good rates.
However, you can try another monitor cord (between monitor and computer; not likely to be the problem, but rarely can help). Flat screen (monitors/TVs/laptops) generally last 5+ years with average use, but I've seen them fail within 2 years (especially on laptop computers). In general, if you got 3 to 5 years out of a monitor, you did ok.
PS: If buying a new LCD monitor or TV, look for one that says "LED" on the box. (LCD monitors traditionally had a few fluorescent bulbs inside as "backlights", but newer LCD monitors/TVs have hundreds of tiny LED lights inside, which last longer, use slightly less electricity, and give more even lighting on the screen edges).
Hello What is this? Are you trying to take a class to everyone to thie world, how the LCD TV works? I think you be a student, not a professional. If you wer a professional, you may won't dare to post this as a problem. OK.
Please work through the following steps to troubleshoot your no power problem with a ViewSonic Monitor:
Troubleshooting Power Issues:
Disconnect and securely reconnect the Power Cable. Then retry the Power Switch.
Try using another Power Cable. Most Computers use a similar power cable.
Check the power source using another electrical device (like a radio) to make sure the power source is supplying sufficient voltage.
If the monitor is plugged into a power strip or extension cord, try connecting to a dedicated wall outlet.
If you are using a Thinpanel series LCD (e.g. VP191b, VP201b, etc) check the power switch next to the AC input port on the monitor and make sure it is ON.
If you are using an LCD TV, note that some models have a main power switch on the back side – confirm it is on the ON position.
If using a remote control, make sure the battery is properly installed.
If the LED is on, but there is no video, use the following links:
LCD or CRT monitors : Orange/Amber LED - monitor is receiving power, but no video signal received:
Verify that the computer is turned on. You can test this by pressing the Num Lock key on your keyboard once or twice. If the Num Lock light does not turn on/off, then the computer is not working.
Make sure the video cable supplied with the panel is tightly secured to the video card in the computer.
Check video cable to ensure all pins are straight. If the cable is detachable, try a different video cable
If your monitor is connected to a Laptop or Notebook computer, the video output on your laptop may be disabled. Consult your laptop’s user manual or contact the laptop manufacturer for assistance on enabling this feature.
Connect the monitor to a different computer system (if available) to see if the issue is with the video card or the monitor. Check the user's guide to see if any special conversion connector or adapter is required for proper signal continuity between the video card and the LCD.
If the LED is Red and the monitor has no video (no picture), please try the display with another system.
Green LED - A signal is detected from the video source:
Check the video cable to verify that the cable connection is good and the pins are not bent or broken.