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It seems that the micro-switch to turn on power is damaged. It can be replaced, and can be bought from most of the electronic spare part selling shops. De-solder out one among them as sample, because, pin configuration should be identified when you buy it. It wont cost more, a cheap component.
My TV has the same problem. At first, it was an issue with the button itself, somehow some gunk got down under the button and kept it from pressing down all the way most of the time. A few days after we fixed that, it started to mess up again, this time it was an issue with the way it transmitted signal to the TV.
If the button being blocked isn't the issue, replace the batteries. If the batteries aren't the issue and you don't have a soldering gun, then you'll need to purchase a new remote.
I bought one from walmart for ten dollars and it works just fine for basic use.
TV won't turn on • Press the TV button. Make sure the TV is plugged in.• Check the wall receptacle (or extension cord) to make sure it is "live" by plugging in something else.• Something might be wrong with your remote control. Press the POWER button on the front of the TV. If the TV turns on, check the remote control solutions on page 26.• The front panel controls may be locked (disabled). Use the remote control to unlock the front panel controls by selecting the Lock Fr. Panel in the PARENTAL CONTROL menu and press OK (box won't have check mark).Buttons don't work • If you're using the remote control, press the TV button first to make sure the remote is in TV mode.• The front panel controls may be locked (disabled). Use the remote control to unlock the front panel controls by selecting the Lock Fr. Panel in the PARENTAL CONTROL menu and press OK (box won't have check mark).• Unplug the TV for two minutes and then plug it back in. Turn the TV on and try again.TV turns off unexpectedly • Sleep timer might have been activated. Go to page 24 for instructions.• KidPass might have been activated. Go to page 21 for instructions.• Wake-Up timer turned on the TV and no remote or front panel buttons were pressed for two hours.• Electronic protection circuit may have been activated because of a power surge. Wait 30 seconds and then turn on again. If this happens frequently, the voltage in your house may be abnormally high or low. • Unplug TV. Wait five minutes. Plug it in again.
You can only reset the TV when you have the remote as it requires holding down the RESET button on the remote control, then pressing the POWER button on the TV front panel. The TV will turn itself off, then back on again. Then release the RESET button. Regarding your problem with the TV not staying on for 3 seconds, you can try unplugging the unit for at least an hour to perform a hard reset of the microprocessor. If the unit still doesn't stay on, you need to check the power supply or the entire board for any blown or bad capacitor, shorted terminals due to accumulation of dirt, or broken solders. It may be a tedious task and requires an electronic prowess to do. Kudos and thanks for using Fixya.
I feel foolish asking this but have you plugged it in? If you have it plugged in are you trying to turn it on with the remote? Have you tried to turn it on by pressing the on switch on the tv? Does the outlet work?
There could be any number of reasons for this. If the outlet has power (you can check this with any electrical device you have, plug it in and turn it on). So if the outlet has power AND the remote has fresh batteries AND the tv is plugged in to the outlet but still will not turn on even after pressing the switch on the tv...then you may have a blown fuse on the power input line into the tv. Take the tv to your local repair shop and ask them to look, if the fuse is blown they'll replace it and voila, your tv is fixed!
Please do not try to do this yourself, there is over 10,000 volts available at the flyback transformer even with the tv not plugged in.
Goog day sir, We need to replace first the bad switch, need to unsolder it, find the replacement one and solder it back. You may need to open the back, remove the main board, and replace the bad switch. reassemble the tv and test. Sad to say this but you may do the repairs or hire a person to do it. check you remote batteries they may be almost dead. hope this helps let now your progress.