Question about Hitachi 43FDX01B TV

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Red CRT is going out

The red crt for the set is going out, there are horizontal lines flickering back and forth through the screen near the bottom of the picture and it is getting progressively worse. Is this problem worth fixing? Or should I replace the tv?

Posted by Chris George on

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  • 398 Answers

One of the convergence IC's is going bad and needs to be replaced.

Posted on Jun 26, 2007

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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
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I will assume from you description that this is a rear projection crt(picture tube) tv. if this is true I have good news/bad news.
faint red horizontal bowed lines in the picture indicate the screen(G2) voltage for the red tube is too high.Slight lowering of the G2 adjustment will eliminate these lines. I stress SLIGHT because too much adjustment will mess up the gray scale .
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Sounds like you have an intermitant overdrive situation on the red CRT. This could be caused by a bad component on the Red CRT board, an intermittantly shorting CRT or the circuitry in the main board. You should not run it until the problem is resolved as you could damage the CRT if it is not already bad. This is something that unless you are a qualified tech you are not going to have any success resolving. It should not be very hard for a good tech to diagnose the problem. Costs will depend on the part which is bad. If it is the red CRT it probably is not worth fixing, but it could be a 50 cent capacitor. Certainly worth the cost of a service call. Good luck.
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it sounds like a b+ cap going bad and is intermittant that feeds the the video drivers on the crt pcb or the crt is shorting. I have seen intermittant shorts in crt before.
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