Can not figure this out

FISH TANK? What is it? Provide more details please.

You may try using the power switch on the TV itself instead of the remote. I have had trouble where the remote turn on doesn't work for the video, holding down on remote button longer seem to help.

Also you may want to try another input to the TV -so connect up input wires from your cable/sat to another one.

There are so many reasons for this fault. If you wish to know more, check the site linked here. It has details about troubleshooting to Panasonic TC****** series TVs. http://electronicshelponline.blogspot.com/ Pull up previous posts there, either by type in the model name to your set in its search box, or view it in Mosaic /Timeslide option.

Check the back-light is present. If not, check and replace back light inverter board. http://electronicshelponline.blogspot.com/. If you wish to get more details, check this link. It has details about Panasonic TC-26LX series LCDs. Pull up older posts.

Hello:
This procedure will bring up the self test screen and reset the unit to factory settings for you.
First produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote control for more than 3 seconds.

I did it myself. With 2 HDMI cables, it was easy.

YPU HAVE A BAD PANEL. THE COST OF REPAIR WILL PROBABLY EXCEED THE VALUE OF THE SET.

codes for Panasonic TVs
0012, 0031, 0206, 0148, 0226, 0229, 0230, 0224, 0223, 0222, 0220

Hi,

Your Panasonic TC-26LX20 26 will only allow video inputs through the:
1. composite video/audio input ( RCA phono x 3 ) - front or rear
2. S-Video input ( 4 pin mini-DIN ) - front or rear
3. component video input ( RCA phono x 3 ) - rear
4. HDMI ( 19 pin HDMI Type A ) - rear

Depending on the output(s) available from your PC, you can use any of the following:
a. the yellow RCA female
b. S-Video output ( 4 pin mini-DIN )
c. VGA (which normally goes to the monitor) but would require a VGA/HD to HDMI Format Converter such as the one here

Should this be not enough information, please post back with what PC brand/model that you have. Additionally please specify what Video Card are you using if your PC is a desktop.

Good luck and kind regards.

I am also having problems with the same year and model number panasonic, it is at the repair shop now. I think it is a lemon tv. won't buy panasonics anymore. Tried all the fixes recommended by panasonic. It happens after the tv is on for longer than 1/2 hour. It happens with dvds and different hook ups. my samsung is fine on all the same connections.