I have an old LG TV model CI 21Q20ET. The power switch is faulty. When the remote unit is used to put the tv on it appears to power up and then immediately shut down. On one occasion you could hear it power up, then down, then up, then down, ... You get the picture.
Please could you let me know whether it is worth trying to get this fixed or should it just get trashed?
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If the standby light is ON, and the set does not power up by pressing power switch at the remote control, or at the side panel power switch, the main board is faulty. If there is no standby light, the power regulator board is faulty. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
The lamp has already a resistance which is sense by the processor and made the unit a subsequent shutdown. It will produce an overload to the ballast board which is detected by the processor. Replace it with new one and your unit will back to normal again.
Hope I helped you.
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You may want to try a “Hard Rest” by unplugging the power from the TV.
While the TV is without power, one at a time, push on each of the buttons on the TV & listen to hear them click (there may be a button stuck down).
After at least a few minutes have passed, plug the TV back in.Sometimes the TV may power on by itself and other times it will may not.If the TV did not power on by itself, push the button on the TV to power on the unit.
After the unit has power on wait about 30 seconds.Now point a known working remote at the TV and see if it is working correctly.You could test your LG remote on another LG TV at home, a neighbor’s house, and or at a store.
If the TV does respond by using the buttons on the TV but not with remote control, the problem could be with the following.
Remote Eye board and or the Main board.
I hope my information has helped you.
This issue is related to the TV's main board not seeing constant A/C power to unit so the board is turning off the TV. When the TV's main board see A/C power back to the unit, the TV will try to turn back on. This issue could be a loose power connection for the TV or a failing part inside the TV. Do other electrical devices work when plugged into the same wall outlet? Try the following: 1. Remove the cord from the back of the TV and reinstall it (perhaps it's loose going into the TV and was not installed correctly). 2. Try putting the cord into a different wall outlet (perhaps it's not a good outlet). 3. Try using a new power cord for the TV. (Any matching cord will work for testing)
If the above did not resolve the issue, then it could be the switch mode power supply and or the main board inside the TV. Both items are easy to change out. I can look up the LG part number for you.