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What are the symptoms of a failing Cathode Ray Tube or parts

 
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vince
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PostPosted: Mon Dec 12, 2005 1:36 pm    Post subject: What are the symptoms of a failing Cathode Ray Tube or parts Reply with quote
I have a 60" Philips rear projection television with problems noted on this site on the 10th of this month. Anyone know what happens when the CRT or any of it's components fail?
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jb38
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PostPosted: Thu Dec 15, 2005 12:09 am    Post subject: Failing CRT symptoms Reply with quote
It can manifest itself in various ways, but the most common is for the picture to have lost its brilliance, this happening over a period of time, maybe about six months or more, and also the contrast to be poor with a washed out looking picture, and any attempt to increase the brilliance level usually results in a still dull, but blurred picture.

The above is caused by low emmision of the tubs drive guns. In the past a booster transformer was fitted to overvolt the filaments (heaters) which overcame the low emmision problem (for a while anyway), but this is not really done so much nowadays.
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Guest
PostPosted: Thu Dec 15, 2005 12:11 am    Post subject: Re: Failing CRT symptoms Reply with quote
jb38 wrote:
It can manifest itself in various ways, but the most common is for the picture to have lost its brilliance, this happening over a period of time, maybe about six months or more, and also the contrast to be poor with a washed out looking picture, and any attempt to increase the brilliance level usually results in a still dull, but blurred picture.

The above is caused by low emmision of the CR tubes drive guns. In the past a booster transformer was fitted to overvolt the filaments (heaters) which overcame the low emmision problem (for a while anyway), but this is not really done so much nowadays.
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