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Tv screen is normal, then green then off. Please help

Hi I have a Sylvania Model # 6427TF . When I turn the TV on the picture is normal for a few minutes and then it turns really bright green with no picture. After a short time it will shut off. The sound continues to work and is recieving the station still.
Would this be an IC or something like it that I can replace?
Or is this the tube?
If its an IC or something like this that I can purchase and then replace could anyone tell me an exact location and part # ? Or if someone has a repair manual would it be possible to get a copy?
I have a 19 inch sylvania which is around the same year for parts but this is a 27". Would IC's and such possibly be swappable?
Thank You's Again
And thank you's again for when you helped with the 60" philips (Its still going strong).
A.J.

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  • Alvin Moats Sr.
    Alvin Moats Sr. Jan 11, 2009

    Thanks Again Slinteriors. Do You possibly know where the green output transistor would be located or which board. The TV hadnt been moved up until this happened, but also if you could direct me to the cathode. Can you give me discriptions of these parts in these sets too please.

    I really appriciate this. Thank You Again.

    ETRONIC

  • Alvin Moats Sr.
    Alvin Moats Sr. Jan 11, 2009

    Hi Again Slinteriors. Can you tell me the approximate locations of these parts and descriptions of them on these sets.

    Thanks Again

    ETRONIC

  • Alvin Moats Sr.
    Alvin Moats Sr. Jan 11, 2009

    Thank You Slinteriors, I will check this out in a while. So if the cathode, basically it will become a curb item right? Could probably just purchase another depeng on the price of one.

    I'll let you know how things go.

    Thanks Again,

    ETRONIC

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  • Sylvania Master
  • 8,617 Answers

It can be one of two items. The green output transistor or the green cathode has developed a short.

Posted on Jan 11, 2009

  • Sonny Berry
    Sonny Berry Jan 11, 2009

    I dont have the schematics to your set available. But there will be three transistors on the CRT drive board which is plugged into the back of the CRT one of those will be for green, It should have either a G or indicate green on the board near the transistor. The Cathode is inside the CRT if thats defective the CRT will need replacement.

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