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Zenith 25MC33 Set
Working on a Zenith 25MC33 color roundie chassis and would like some troubleshooting advice. I have gone through and replaced any resistors over 20% which was only 4, weak tubes were swapped with good tested tubes, replaced the electrolytic capacitors, and like others had to replace the horizontal linearity coil as the plastic form had fallen apart.
The set powered up but I can not get full vertical deflection, it appears to be folding over short from the top. I can fill the screen by adjusting the vertical size and vertical linearity but then can not get the vertical hold to lock.
Troubleshooting so far:
Here is what I get: Highlighted parts replaced: |
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