We have a Zenith model B25A24Z made in April 1999 but has spent most of it's life in storage. We just hooked it up and the picture is fine, but no sound. I've tried unplugging it while on and replugging it 5 minutes later, as suggested as a reset. No luck. I have some experience in electronic repair, but do not have a circuit diagram for this unit. Any suggestions greatly appreciated.
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If you actually have the Zenith model TV (B25A24Z), the trouble is not in your set. This model has only an analog tuner, and what it sounds like you are describing is digital pixellation. This is what happens with a digital-to-analog converter box when it gets a weak signal, with rain fade or heavy snow on a satellite dish antenna, or when a digital cable system has some signal problems. The converter equipment locks the last complete frame (or breaks up into blocks and freezes) and the sound is muted.
You'll need to look for the cause of your trouble in whatever is feeding the TV. If you have a digital converter box for off-the-air broadcasts, make sure you have a good antenna and all the connections are tight. If you have satellite TV service or digital cable service, you might need to contact your service provider for help in troubleshooting and fixing the trouble.
First of all, you certainly have three bad capacitors in this TV. CX3416 is a 25 volt 100mf cap that is bad. Cx 3218 is a 160 volt 2.2 mf cap that is bad and finally C3460 is a 25 volt 220 mf cap. The C3460 is the culprit that is stopping the feed to the audio out put IC. This cap is near the audio IC. It is attached to a large heat sink. Resolder the pins on this IC as well. And after replacing the capacitors, be sure to inspect all solder grounds and resolder as necessary. Hope this helps. Thanks for asking and show a few hands of support.
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!
We lost the chat communication.
check this LINK to download your schematic diagram. Make sure you get all the 7 parts before you can open it.
You will need winrar and acrobat reading 6.0 or newer to view the schematic.
You have a picture when you're watching a DVD, but none when you're watching regular cable? Does the audio appear to be okay?? Are you sure you've switched the inputs on the TV back to main???
Let me know..