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Tv Hitachi CMT2588, no color

 
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theno



Joined: 05 Feb 2009
Posts: 4
PostPosted: Thu Feb 05, 2009 1:20 pm    Post subject: Tv Hitachi CMT2588, no color Reply with quote
I want to ask, and help me, what the problem the Tv Hitachi CMT2588 no color. Any one can help me....?
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jts1957



Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away
PostPosted: Thu Feb 05, 2009 2:42 pm    Post subject: Reply with quote
Is Color control working?
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theno



Joined: 05 Feb 2009
Posts: 4
PostPosted: Fri Feb 06, 2009 2:31 pm    Post subject: Reply with quote
jts1957 wrote:
Is Color control working?


before the TV, CRT can't On, no horizonta out, Transistor Horizontal its ok, but no voltage at base transistor Horizontal, after I check, I change x-tal (CSB500F9) on chroma IC, because Ic not working. Now, CRT on but no color come out...
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden
PostPosted: Fri Feb 06, 2009 2:54 pm    Post subject: Reply with quote
CSB500F9 is not a crystal but a ceramic resonator. It is probably used for the horizontal oscillator or any other purpose, not for the color subcarrier oscillator.

Check with a scope that the composite video signal is correct at the input of the chroma IC, if there is an external bandpass filter for the chroma signal then you can check the signal after that filter too.
Try to disable the color killer and see what happens – either you get correct color, or you get just color noise (in this case, there is a fault somewhere in the chroma signal chain, or you get unsynchronized color (which means that the subcarrier oscillator for some reason doesn’t lock).
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theno



Joined: 05 Feb 2009
Posts: 4
PostPosted: Sat Feb 07, 2009 10:05 am    Post subject: Reply with quote
torbjorn wrote:
CSB500F9 is not a crystal but a ceramic resonator. It is probably used for the horizontal oscillator or any other purpose, not for the color subcarrier oscillator.

Check with a scope that the composite video signal is correct at the input of the chroma IC, if there is an external bandpass filter for the chroma signal then you can check the signal after that filter too.
Try to disable the color killer and see what happens – either you get correct color, or you get just color noise (in this case, there is a fault somewhere in the chroma signal chain, or you get unsynchronized color (which means that the subcarrier oscillator for some reason doesn’t lock).


OK, thanks before, I will try..
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