Color is overly green. Will intermittently correct itself back to a normal color temporarily, then revert to excess green condition. Color will cycle back and forth between normal color and greenish color, but remains overly green most of the time.
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Re: Zenith 25" Color TV - Model A25A23W
Your problem is a bad connection on the CRT socket on the CRT driver board, a bad connection in the RGB driver supply from the video jungle IC or maybe even an intermittant Picture tube. the only way to tell would be to tap on the crt board while the sets playing with a non conductive insterment, and see if it changes. Now there is alot of HIGH VOLTAGE at this spot, so if you have no TV repoair experience Please stay safe and call in a pro to assist you. Good Luck
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If this TV is a 25"...then this is an older set. Is the picture dim and the colors dim, will the tint not correct the color scheme? Zenith picture tubes, as a rule, for this model go bad...sorry but this is true!
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.
Turn the set on without an antenna, so there is only snow on the screen. Measure the 3 cathode voltages at the CRT, red green and blue. If the 3 voltages are about the same, around 175 volts, then the CRT is bad (purple picture means bad green gun). If the red and blue are around 175 and the green is over 200 volts, then there is a chassis problem, usually the video output transistor itself has gone bad or come loose.