Rainbow colours An aged neighbour has a bush TV (not LCD or Plasma)and the colour has suddenly become 'rainbow like' particularly around the corners.Do you know how old this TV is? If it is ancient maybe she should consider a new one although she is a widow and has no money to spare so it would be nice if I could help her fix it.

If this is an old Plasma TV that you picked up somewhere, it may just be too old. Plasma screens degrade over time.

New plasma TV's are not common anymore, so I am assuming this one has been around for awile.

If it is new, take it back to where you bought it.

Degaussing thermistor failed. Replace it. Check and replace the CRT base socket. This could be cause this fault too. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.

Every single colour is in the rainbow except black and white because they exist of every colour themselves,

When you say 'rainbow look', do you mean vertical coloured lines on the screen? If so, then you will have a faulty Tcon. Could you get a snapshot of the fault and post it on here please then we can identify the problem more easily.

It sounds like your TV may need degausing.
Is your TV situated near to any loudspeakers or other devices with large magnets inside them? Or has anyone been near your TV screen with a magnet???
You need to try to get the screen demagnetised (degaussed). Many TV engineers have a degausing coil that could do this. It only takes around 20 seconds at most.
Some TV's like Mitsubishi have a DG button on the remote, that does this function without the need to call out an engineer! It only needs one press of the button every few years!

you should change the display for your phone

This is know as a diffusion issue. Most times this can be corrected with some minor alignment on the pots on the YSUS pwb. Sometimes the YSUS pwb has failed and will need to be replaced.

It could be convergence problem.

If the Photo is OK then it would appear to be a LCD fault. Checkout Nikon Customer support. At a guess if this more than 2 years old a new camera would be a more economic option.