Question about Zenith R40W46 40" Rear Projection HDTV-Ready Television

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Loud electrical sound in rear of set(tv)

When pressing the on/off switch, the tv makes a loud welding noise ans is also spark producing and the unit has no picture of sound.the tv is only 2 years and 7 month old.

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Sounds like the High voltage is leaking out and arching somewhere. Have a look in the back and see where it is BUT be CAREFULL!! This is enough voltage to cause serioud harm to you. If you have no TV repair experience, this is not the repair to start experiementing with. Play it safe and call out a pro to assist you. Good Luck.

Posted on Mar 31, 2007

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Posted on Jan 02, 2017

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Your description sounds like one or both of the rear drum supports (rollers) is bad. A quiet thumping is almost always present as the weld in the drum comes in contact with the drum supports. A binding support will squeal, and the thumping could be worse at that time. After running the dryer until the noises are present, once disassembled, you can tell if a support is bunding or rolling normally by spinning it by hand. The same goes for the idler pulley. Make sure power is disconnected from the unit befor attempting any repairs.

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The 23" CRT set may have a high voltage breakdown in the flyback transformer or focus divider. Take the back off and operate the set in a dark room. Look for anything that has a blue glow around it or sparks flying when the pop occurs. I won't guarantee this will find your problem, but it is definitive if you see these!

I once had a set with these symptoms. I stopped the blue glow and arcing by covering the focus divider with epoxy. It worked for a couple of months before the divider literally broke apart.

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To sum up, the loud humming is caused by out of spec components or for that matter dried up used up components, the fact it runs for hours at a time is most likely weather dependant and if not its likely to be a dry joint somewhere on the board. These are also unfortunately largely dependant upon environmental conditions. Best of luck. :o)

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