Power went off a moment now back on TV sound and words on but no picture at all black screen?

Check and replace the back-light inverter baord.

Good news - don't worry about this TV anymore and just trash it out the moment you buy a new one!

It seems to be a PSU (Power Supply Unit) problem. When you unplug it and replug, the screen comes on for a moment. That means that the capacitor does not hold charge for long. Open the back and look for bulged or burst capacitors on the module where the power cord meets inside. Replace the whole module if you can not replace the capacitor with exactly the same specs.

Hi, you need to get your TV kit replaced... Please reply with the model number of your TV if you repairing it by your own.

I will forward a link to a page where you can get more information and troubleshooting steps for this issue.

http://www.kb.sony.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=C399467

Could be the power supply gone bad.
No easy solution I'm afraid.

I found your site confusing. If you had read my post, you would have noticed that my problem referred to a 15" flat screen 'CELLO' .TV/DVD combo. I had sound but no picture. When switched on, the screen lit up and the word CELLO appeared then the sreen went black

Sounds like something is imposing Picture in picture on your scrren with no source attached to the other picture. Could be cable or Sat or some other device, or TV PIP.