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Check first to see if remote works---most shops or Radio shack have a remote tester---point remote at it and push a button and tester will indicate if remote works----some digital cameras will also work for this.
If remote is good either a problem with the remote receiver on front of set or the remote circuit inside the set.
You may have a component failing in the red drive stage possibly the blue as well or even the quadrature stage. A can of cold shot should help narrow the search considerably. It is also possible the red and blue projection tubes are nearing the end of their service life as well. If you have the means to test the tubes themselves, check the red and blue tubes for gas.
1) Press the POWER button to turn your TV on. Make sure you are set to Cable/TV reception. If the "replace lamp. Reset Lamp timer" notice appears, press "EXIT" on your remote. 2) Press and hold the VOLUME DOWN BUTTON on the TV set (not the remote, the actual TV set) 3) Continue to press and hold the VOLUME DOWN button and press and hold the PIP (Picture in Picture) or SPLIT/PLAY button on your REMOTE control (your are pressing and holding BOTH of these buttons at the same time now). 4) After 5 or 10 seconds (be patient), the lamp serice menu will appear and say your lamp counter has been rest to '0' (zero). That's it, you are all done.
Now, I continue to have the power shut off after a few minutes of play. I think it is a problem with the cooling fan. Damn it all anyway.
Just found a solution to this problem (conveniently hidden on unlucky page 13 of the user manual). This means that your TV is in store mode... it refreshes every so often and changes to the different inputs to show store viewers the quality of different inputs.
First, go to Menu - Setup - Advanced Setup and make sure that the "Auto power on" is set to "No." Turn the TV off and unplug it. Plug it back in. Press and HOLD the power button on the TV (not the remote). Hold for 2-3 seconds or so... you'll hear a few clicks. Release the button, then press it. The first thing that pops up should be, "Select viewing environment." Make sure you select "Home." Continue with setup from there.
It sounds like you may have a couple of defective convergence IC's, and maybe a couple of resistors. A fairly easy repair. Since you already have a warranty on the set, I would have it repaired and let the company know you haven't been too pleased with the picture quality all along. They may be able to tune it up a bit after repairing it to really make it shine for you. Panasonic usually makes pretty good sets, you could do a lot worse with some of the other brands out there.