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Have the remote tested either with a tester that most shops have or in a dark room with a digital camera the display will faintly flash when remote pointed at it and buttons pressed.
Also if button does not work (power) unplug the set for a while to see if it will reset. If the tester shows same problem--no working for power or have to press ******* buttons 99% chance something got spilled onto remote and got inside
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.
Ur tv have a button that said Menu on the bottom tv beside buttons only said POWER,CHANNELS + -,VOLUME + - ?Used the tv menu button go through the options functions look for Close Caption find CC 1,2,3 or TEXT 1,2,3 turn it all off,will stop captionning,if tv have no Menu option button.The captionning can be turn off by an original remote only.Try website like Remotes.com to buy the tv original remote.
You have already diagnosed the problem,the remote receiver on the tv is bad,is rare but it happens but before you call for help try unpluging the tv from the wall for 10 minutes and then plug it back in and try it,sometimes this takes care of the problem,if that does not do it you will need the help of a servicer ,your remotes are working but the receiver is not processing the information.If you are familiar with tv service it should be easy to locate the receiver,sometimes is soldered to the chassis and sometimes is part of the push button assembly and conected to the chassis by wires,if is part of the push button is easier to replace,if you are not too familiar with tv service be safe and ask for help.