Question about Projection Televisions

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We have a 25 year old zenith console, pretty old.. but still functional.. we noticed that the tv turns blank to a green screen... no picture just green color shown on the screen, then it will go back to the picture sometimes.  Do you know what kind of problem is...

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  • jessluvu Jan 20, 2009

    is this something anyone car repair, if so how would you do it?  And when you say cold solder do you mean affected by temperature, as it seems when the room gets warmer the tv is ok and the screen does not turn green... funny as it seems... 

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Hi and welcome to FixYa,

Initially, your described problem indicates that one of 3 color drive transistors (for the green) has developed either a cold solder (most likely) or an intermittent internal fault (leak). These transistors (or in some cases a single power pack module/IC) are normally found on a small squarish PCB (printed circuit board) at the very rear of the picture tube (CRT). At times, the green blank screen would also have diagonal fine lines or would appear to be overly bright.

In some rare instances, it could be the chroma section (least likely) or in worst case scenario the CRT (cathode ray tube) itself that is faulty (hope not).

Check and perform preliminary visual or necessary inspection. Pls post back result(s). Good luck and Thank you for using FixYa.

Posted on Jan 18, 2009

  • Louie  Role
    Louie Role Jan 20, 2009

    Cold Solder would refer to a solder joint that was not "cooked enough", thew solder did not melt completely to join the transistor's leg and the board.

    This of course would require opening the unit, perform voltage measurements, determine faulty component and subsequent part(s) replacement. Further, a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron would be required. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

    If the cost of repairs and downtime would be factored in, then you may have to re-evaluate your options and consider a replacement.



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