Question about Zenith A27A11D 27" TV
Wondering if this is worth fixing. TV has a good picture but there is no red, just Blue and Green. Every once in a while the red comes back but then goes out. TV was no dropped. Problem just started and TV is almost 10 years old. Is it worth it to fix?
A short answer, YES. I suspect a cold solder on the red drive transistor. That transistor is one of 3 identical components (one for each of the blue & green). They are normally found in a small squarish PCB that is connected to the rearend of the picture tube. In some instances, they are also heatsinked. More often you need to remove the shield/screen protecting the foil side of the PCB. This has to be done gently since it can easily crack the glass holding the pins.
Cold Solders are corrected by applying heat from a soldering iron and probably a dab of solder lead. Solder joints should be shiny (not dull gray) with no air bubbles.
If your concern has not been corrected after completion of the above procedures, you may need to replace the red drive transistor. it might also be worth your while to check for any other component that may suffer from cold solder and/or any loose connection(s).
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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Posted on Feb 15, 2008
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Posted on Jan 02, 2017
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