My philips hdtv's red tube just shot down,, i opened it and it still not totally shot down, but it light so dimmed that it turn look like its busted,, what do you think is the problem? is it have to be replaced?
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The set will need a convergence repair kit. Or to turn the red CRT off you can turn the screens down on the red CRT untill it shuts off, But the set will have a very blue or green picture and will not be very good to watch. A convergence repair kit is the best way. You can get the repair kit with instructions from www.tvrepairworld.com
The adjsutment that you turned down was the G2 voltage to the red tube which is just a temporary fix for a CRT which has a short developing in it. Try turning up the red adjustment again only slightly to see if the red CRT ( tube) will light up
if it does and then the set shuts down its most likely the red CRT which is bad . If it lights up but you get retrace lines but doesnt shut down it possible that its the CR board ( Red CRT Drive Board) which is at the very bottom of the red tube.
It might be the the socket board on this model not the crt tube. Closely look at each tube these tubes end up contaminated. They start looking like lemonade inside. Usually the blue and green, with the tv off see if the green and blue are as clear as the red with a flashlight. You might want to call a service center. Cheaper in the long run over the cost of a tube.
It sound like a bad tube there are three tubes red green and blue.
i suspect the blue tube is bad. tubes cost 160.00 plus labor 450.total . sometimes the tubes
can be fixed or the tv tech can adjust the screen voltage on the tube.
The coolant in the blue tube has no doubt congealed to an oatmeal like consistancy. Did you notice things like blue halos around things for some period of times. change the coolant. that should correct the blue. this is a common thing for that model as well as all TVs. Blue and green has this happen, Red seems to not have the same trait.
From your description it does sound if the blue crt has failed. But it can be the crt board or a high voltage issue. intermittantly like that could be a connection problem. is there any hissing ..cracking or smells?
If decide to do yourself, ya only have to do the green and blue ones, the red light spectrum won't allow fungal growth. Pull whole CRT assembly out to prevent spilled/leaking glycol from onto lower main boards