Question about Zenith SY2568S TV
This is problem is in the CRT neck board. CRT Picture tube has 3 color gun (Red, Blue, and Green) and drives by 3 color amplifier transistors(identical in the neck board).It has also a resistors. Each gun has an identical circuitry (means you have 3 identical circuitry in the neck board.
Since you are missing the red color, it is an indication of dead red circuitry. Most common problem there is a bad solder joints, shorted/open driver transistor. You can fix it yourself because you have a guide through a working parts(green and blue). You must have a multimeter to compare the reading of the parts. You may also swap the identical parts, once swap the faulty one the symptom will reverse (if swap to blue, you will have no blue color now).
Worst case cenario is faulty picture tube....
Let me know if you need further assistance.
Hope I helped you.
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Posted on Mar 27, 2011
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Posted on Jan 02, 2017
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