There is usually a remote module mounted on the inside of the front of the tv that senses the remote signal. This controls all functions of the tv. If you are not comfortable in troubleshooting this, I would recommend a repair center.
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Sounds like you're stuck on..... Video 1 or Video 2 (whichever). If you can access your TV's menu at the front panel, you should be able to switch over fairly easy. Hit MENU. Using your VOLUME UP & DOWN buttons, Go to CABLE/SATELITE/ANTENNA, hit VOLUME UP or DOWN 'til it switches back to TV picture then hit ENTER. If you do not have an access panel in front but possibly have any other remote (cable or satelite or home theater, etc...) that can be paired with this TV and has an INPUT button, you can change the setting that way.
I don't have a solution but if you take off the speaker grille on the front of the set and see two ribbonish cables, unplug the smaller one. The volume will not increase anymore but you cannot use the controls on the front of the tv and the power light will not show green anymore. You can however use the remote to do everything on the set that you would normally do. Hope this helps until I find a real solution.
With the desired equipment on, press and release the Mode button until the light flashes behind the correct mode.
Using the tip of a pen or the eraser on a pencil, press the address button.
Enter the code (see links to find your code below) on the remote's numbered keypad for the equipment.
Press the Address button. If the code entered is valid for the remote, the mode light flashes three times.
To verify the code works, try several functions for that equipment.
Some codes may provide partial functions or respond differently than
the button's titled function. Try the other codes listed for that
device until you find one that offers more complete functionality.
The remote is not the problem. The switch for volume up on the control panel has become leaky. Very common problem for this generation Mitsubishi. If you don't mind not having the control panel working you can disconnect it and the set will work just fine with the remote. To disconnect the control panel pull the speaker grill, it just snaps off, and remove the front access panel. Once that is done you'll see a cable going to the switches just disconnect it.
Could be a contact piece of the MUTE button from your remote that is causing it. Go out and Big Lots or Radio Shack to get a cheap universal remote control(big lots would be between $5-$10) Pick up the code for it,and when the tv happens again,your the OLD remote MUTE button to turn it back on and then put away this remote control and use the new universal remote control. However,if the problem is coming from the manual MUTE button on the TV,you need a repair tech, to fix it! solutiondoct
If the television is connected to a cable box such as Time Warner's HD box, the picture mode can be changed by pressing the '#' on the cable box's remote keypad (where the channel numbers are). This cycles the picture between zoom, normal, and stretch which could be cause of your problem.
Check for the proper code for the remote. I presume you have either a cable or satelite box and you have set the remote according to the manual.
I have had a similar problem with a flat screen LCD television from COSTCO and the remote control would set the "sleep" control at random. We would be in the middle of a program and zap. I had them replace 3 units, talked to the manufacturer and they said they were awaiting the proper codes from China.
Bought a name brand TV from Future Shop....no problems since then. Same Satelite unit and remote.