Page 1 of Clean Screen

Why is is so difficult to get a widescreen television that has a clean screen? What I mean is when you view a white picture (eg a snowy scene), it should be completely white from one side to the other with no darkening or discolouration anywhere across the screen. I am on my third telly now and this one will be going back soon! The first was a JVC AV2825EK which was great on the day a bought it but soon developed darkening in the corners, then further strange colour patches appeared. This was diagnosed as a faulty tube and, due to no availability of the JVC, it was replaced by a Sony 28DX40. The Sony arrived with one darkened corner (top left) plus a sort of purple-tinged patch on the left hand side. This has been replaced by another 28DX40 which has the same darkened corner but now with an orange colouration down the right hand side.

I have had engineers out who did all the usual degaussing etc but to no avail. The telly isn`t sited near anything metallic either.

Does anyone know about this? Am I unlucky or is this just the way it is? Should I continue to have John Lewis send replacements until I find one that is right? Will I ever find one that is right? Any advice or comment are very welcome.

Going for an expensive brand name does not allways guarentee a long working life with no faults.

My own opinion nowadays is not to buy expensive brands and you get a larger telly with a similar guarentee to that of the expensive one.

I checked with `Which` magazine before buying and was looking for reliability first.

I eventually got a 32" for the average price of a 28" widescreen TV, make: Goodmans .

Touch wood no problems, still going strong and none of the effects you are talking about.

My philosophy today is to buy electrical goods that are not too expensive, it works for me, I buy the cheaper microwave ovens, Video & DVD recorders and if they last two years then I have one out, and if they go wrong it is as cheap to buy another than the cost to get a repair done.

It is now a throw away society.

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Why is is so difficult to get a widescreen television that has a clean screen? Is your TV a flat screen ? I ask that because it`s my thinking that a lot of WS "flatties" suffer the same problems as yours. My Thomson occasionally has this orange "splodge" at the top of the screen on which degaussing has no effect. A technician called out under warranty terms told me that the shadow mask becomes distorted sometimes with excessive beam current. In layman`s terms that means that when there are very "contrasty" colours particularly red, the current becomes excessive and distorts the shadow mask which I understand is located right at the front of the CRT and controls the flow of electrons to the different phosphors to make the colours. If it becomes distorted then the colours at different parts of the CRT go awry, hence some colour impurity. Not much comfort I know, but it seems to be one of those things we have to sometimes live with (unless it makes the picture unviewable).

JohnF

GW6UFO is QRT at the moment