Question about Zenith B32A34Z 32" TV

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Power on off switch not working

I just replaced the main module on my set, and now as soon as I plug it in, it comes on I cannot crontrol the system from the power on switch, every other option seems to work. I can control the sound up and down, I can change channels, this is from remote or from front key pad. any suggestions as to what would cause this? thanks in advance Ron

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Re: power on off switch not working

Do not operate the set anymore, before taking the following steps, or damage to the HOT, electrolytics or zener diodes may occur. - see if there are 2 small electrolytic capacitors in the primary part of the power supply, could be C909, C910, C911 or something. The values are usually 47u 25V and 10u 50V. Especially the 47u which is in the base drive of the switching transistor causes over-voltage conditions. They both should be replaced. - there should be a 2SC2335, BUV46, BUT56 or BUT11A in the +105V line on the secundary side of the power supply. This is probably shorted thus causing no power-off. Replace it along with the transistor driving it (2SA1013 probably). If the above does not apply to your TV, you're on your own for now, and you may actually be having a microcontroller faillure...

Posted on Oct 06, 2005

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SD TECH

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