Question about Apex Digital PF3230 32" TV

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Clicking Noise, Jumpy Sound, No Picture

I left my TV on when I went to run some errands and when I came home about three hours later, there was no picture and just jumpy sound and a clicking noise emitting from the unit. The sound basically is like someone is precisely muting and un-muting the TV every second and the clicking is in sync with the muting. I unplugged the TV, let it sit for about an hour and tried to turn it back on. After pressing the power button, I hear the usual "bahmb" telling me that the tube is firing up, but after about 30 seconds the picture is not there and the muting/clicking begins. I turned it off, removed all the cable inputs, etc. and the same thing happened again. There have been no warning signs of it going out, and it is fairly new - about 1 to 1.5 years old. I just don't know what else to do! Thanks for your help!

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The SMPS (switch mode power supply) is a bit tricky in this unit. Failures in the SMPS can give false impressions of what's actually happening with regard to the symptoms. You'll need to ESR the caps in the SMPS first. C525 250v/10uf is a good place to start. It sounds like the B+ voltages are present by the noise you're describing and that would indicate that the regulator circuit is probably okay. Next I'd check things like the HOT (horizontal output transistor) for short. NOTE: If you don't have an ESR meter the job is nearly impossible. Electrolytic caps don't always show any outward signs of damage. Only by checking their equivelent series resistance are you able to determine if a lytic is the culprit.

Posted on Jun 01, 2007


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