TV turned on with the remote this am and then was unable to change channels, adjust volume or turn back off plus manual controls on the TV do not work either. Had to unplug to turn it off. If you hold the ON/OFF button on the TV for about 10 seconds it turns on and to turn it back off you need to hold the ON/OFF button another 10 second and it will turn OFF; however when you let go of the ON/OFF buttons in a few seconds it will come back on.

SOURCE: 42" Plasma TV Problem

same frustrating symptoms on brand new 42inch here! tv just turns itself off sometimes without warning or if changing to certain channels. leaves red light flashing for a while then red light goes away. any attempts with remote gives flashing green liht on tv. manual power off and on restarts tv but auto off again. found while manual power on keep changing channel on remote till stable picture appears. then use remote to shut down tv - solid red light indicates standby mode. then use remote to turn on again... till next time it happens. but what is technical fault??

SOURCE: won't respond to volume or channel changes red light blinks 20x's when turned off.

It's definitely a firmware problem. I called Panasonic and they were very polite about the entire situation and sent me a SD card with the firmware update. If you don't have time and you're tired of listening to tv at the same volume there is a way to do a hard reset.

I figured that unplugging the unit would do this, but there is one other step that you have to do to ensure that this works.

Generally the power button on the tv is always in the "on" position, this is what allows the remote to work. In order to do a hard reset the on/off button must be in the off position. Make sure that is off, then unplug the unit, let it sit there for a minute or two and plug it back in. If the tv comes back on as soon as you plug it back into the wall/powerstrip then the button was not in the off position.

This isn't the best fix, you'll still need to get the firmware update but it will at least give you the ability to use your tv normally....well until it decides to randomly lock up on you again and you have to do this all over.

SOURCE: Panasonic 32 inch LCD TV will not turn on-red light flashing

The number of flashes is an error code. Count the number of flash. It looks like one of the boards in your set is failing intermittently. Panasonic codes for a guide as a starting point. Exact board STILL has to be verified;
One Blink: One blink of the power LED indicates a problem in the inverter circuit located on the LCD panel. The inverter board is not to be repaired in the field. Therefore a replacement is required.
Three Blinks: Three blinks of the power LED indicates an over-current or over-voltage condition in one of the DC supplies of the AP board. The AP board is repairable. Therefore the use of an ohmmeter and peak-hold-voltmeter is required to determine the cause of the shutdown. An over-voltage condition is definitely a defect of the AP board. An over-current condition may be due to a short circuit located in the AP board, A board, or the LCD panel.
Five, Seven, or Eight Blinks: The A board is responsible for five, seven or eight blinks of the power LED. The MAIN +3.3V, MAIN +5V, and MAIN +9V sources are all produced on the A board. The detection input pins of the MPU, IC1100, monitor for their presence.
Four or Six Blinks: The AP board is responsible for four or six blinks of the power LED. The DTV9V, and SUB_5V sources are produced on the AP board. The MPU IC1100 monitors for their presence when the unit is connected to AC Power. A short or open circuit on the A board may also be responsible for their absence.
Nine Blinks: Nine blinks of the power LED is due a short circuit in the audio output circuit (s) of the unit. The audio output circuit is located on the A board. Confirm the status of the speakers. If defective, perform a replacement. If ok, replace the A board.
Ten Blinks: Ten blinks of the power LED indicates a malfunction of IC4200, the frame converter. This IC resides on the A board. Therefore ten blinks of the power LED requires the replacement of the A board.

SOURCE: TV won't change channels or adjust volume

Do you have a universal remote? If the batteries are taken out for a little period of time, the remote will loose the codes and they will have to be reset. You can find the codes by google universal remote codes.

If you have a factory remote that came with the television, than it may be faulty or the sensor on remote or tv may need to be cleaned.

SOURCE: can't turn tv on with remote, only manually, when on volume is at 100 and cannot be adjusted with remote or manually. channels cannot be changed with remote or manually. Changed batteries in remote,

replace with new batteries and it works --- so simple