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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).

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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.


  • 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


  • 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,




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  • 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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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?
Possibly; I'm not familiar with either of your sets but there are several places ths could happen and in one of them, it would use a fairly large IC with 26 pins. Common older part numbers are:
- M51387 - LM1205 - LM1207
All of these vary somewhat from each other but are all the same pin count and all handle RGB signals. If the two sets both have one of those numbers and are the same, these can be swapped. The latter two differ in their bandwidth; LM1205 - 130 MHz, LM1207 - 85 MHz. The 1205 can replace the 1207 in most circuits.
The above would be the 'nicest' problem, others are more difficult to diagnose: 
- Failed green final drive - this would be on the CRT base board and a transistor that is intermittantly shorted   - A capacitor working with that transistor is shorting  The two problems above could also be in an area that is using much the same components in both sets. - A short internal to the CRT between the green grid and its cathode. This one can also be intermittant. The cathodes have a coating that can peel away from the metal tube and produce a high resistance short between cathode and green control grid, bleeding off the negative bias of the control grid.  This is a tough one to verify as one should have a thorough background in this area of electronics and preferably a bit of test equipment not found in most garages.
The more I think about it, the more convinced I am that this probably isn't in the range of DIY enthusiasts.
If you can find any TV repair left in your area, I would even recommend that you have this repaired instead of racing out to buy a new flat screen of ANY brand name. Do some research here at Fixya and look for 'flat screen TV problems' or LCD, plasma or projection TV. All of these are crapping out awful early in life and there are millions of unhappy consumers out there who have spent billions of dollars to upgrade for the coming HDTV changeover and their sets are already broke before it happens. Hopefully, you got at least one of the taxpayer funded "coupon eligible" converters.
We have ours for our two older sets to use when our pretty big screen TVs take a dump.          

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