I HAVE A PHILIPS 50' plazma and the screen keeps freezing,flickering as it has some kind of interference but we have had an areial engineer to check the signal strengh and said its excellent.what else can you advise

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Most Large Flat Panel Televisions have components on the power supply go bad; if you know how to use a soldering iron, sometime they can be repaired, most common component failures are zener diodes and capacitors. If you can't solder, but can use a multimeter, you might be able to diagnose the issue; if you need a new power supply they can sometime be found on ebay for a reasonable cost... If it is anything more serious then that, it's not worth fixing... hope this helps...

A small amount of buzing is normal for a plazma set, but should not be loud enough to interfere with watching the set. Givin that this set is 1 month old, return it for warranty exchange.

Dan

That can be almost anything. Sounds like something is keeping the TV in shutdown. Contact a local TV shop.

Power supply board is dead.Replaced the power supply board will solved this problems.Tries Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

You are suffering from a poor signal. Digital TVs will display 'blocking' (partial freezing of the picture in square or rectangular blocks) or total freezing of the picture, when the signal is too weak.

You don't say if this is a recent problem on a set that has been working correctly - that info. would be helpful. However, things to check include:

Has the aerial moved (wind?)
Are you using a new extension coax cable? If so try another one, as connections may be faulty.
If this a new TV, and you have not used digital previously, your aerial may not be high enough gain for a digital signal, but that is unlikely unless it's a nery old aerial.

Remove every Electromagnetic interference source in a 50 CM radius: speakers (low cost speakers are unshielded), fan, transformer, UPS.
Make a symple test using an AM radio: if you ear noise when approaching the area (screen Off) remove the source of interference.
Some time a different orientation of devices will fix the problem.
It worked for me

its due to overheating of any component on the main board and needs to checked with a meter to locate the faulty and replace.

flickers..sounds like a problem deeper than the screen..what kind of pc laptop are you using. and please provide the model number?

There is such a thing as a HD areial, but in this case it sounds like you need to point the antenna in the right direction. If your freeview is digital then there is a diredtion the areial needs to piont, and there is a front and a back to it. You need to find where the signal source is located and point the areial in that direction.