I need step by step instructions on how to set up panasonic vieta tx26lxd80 tv, I need to talk my nan through it over phone, as she has snow on telly, grandad ill, has pressed all the buttons on remote!

TV is ok. Make sure you have the correct input selected for what ever video source you are using.

Refer its user manual for details. It has password override code.
Electro help

Sounds like a T'Con fault. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience.
http://electronicshelponline.blogspot.com/ Pull up older posts.
Screen-shots to defective LCD screen are given. You can compare it to that of your TVs' and can make sure about the fault.

I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.

Hi,


Steps

1. Call your friend.
2. Tell them that you will connect your other friend.
3. Press talk to put your first friend on hold.
4. Dial your second friend's number.
5. Press talk again.
6. Wait for them to answer.
7. When they have answered, press talk again to bring the first friend back on the line.
8. You made a three way call!

Option 2

1. You can press the button that says 'flash' on the phone.
2. Then dial the number.
3. Press flash again.

Option 3

1. While on the phone dial a number and press call/talk.
2. When the dialed number answers press the options button.
3. Select merge/join/combine calls or press call/talk again

Hope This Helps!!!  Please Don't Forget to Rate my Response!!! Thanks!!!
PREM

Warranty time. The TV most likely went into protection mode because a part went bad inside.
I would take it back to the store and exchange it for a new one. 90 day warranty policy.
Have them test the new one to make sure it works so you don't have to waste another trip.
Good Luck

you may need to check you display setting on your flat screen to see if it set to 480p. You may be sending to low of a resolution from the phone to the TV

most likely the power board has a faulure, check the fuses for start.

my panasonic vieta will not connect to hdmi.what can i do