Question about Zenith B25A02Z TV

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Zenith model SM3587BT mostly blue

Picked up a very nice condition, case wise, used Zenith SM3587BT. But the receiver sensitivity seems low, not a major problem, but the picture has a blue tint to it and cannot seem to adjust color any way in menu to get normal color on things. Any ideas, I am a licensed radio tech and know my way around HV radio equipment but TV's are a real pass time for me and I am still a bit of a novice. I do know the HV parts inside the TV and how to take precautions. I am assuming since I can get redish and blue colors that possible the green(?) gun is weak or out, or some control in need of adjust inside?
Let me know please.
genebigham@hotmail.com

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Hi,
I'm not sure of the model but most Zeniths of the 1990's the picture tubes would burn out soon. However there is one that has a transistor short usually from emitter to collector on the main board. Just trace the wire ribbon that go close to the big chip on the main board. There close to the chip are three driver transistors in a row and one of them could be shorted from emitter to collector usually. Use the number on the transistor and put prefix 121 dash and the number to cross it out. I think not sure but it may be a NTE 159 PNP. I have changed many but the picture tube is not like new after changing. If this is not the model then you probably have weak green gun in tube. Hope this helps.

Posted on Dec 30, 2007

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