Question about Zenith 12vDC 800mA 20W AC Adaptor A41208 (1500850) Power Supply

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Zenith TV power goes off

My tv seems to go blank when it gets warmed up.Sometimes it won't even come on. If I unplug it for a few minutes and then replug it in, it might come on for a short time, but then back it goes. Can you tell me how I can repair this myself? Thank you

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Re: Zenith TV power goes off

Hi, From what you have posted 2 possible things: 1. Cold solder - this proble is common in the power supply, vertical and horizantal circuitry. Look for any dull colored solder joints special in power components like high wattage resistor, regulator or output ICs or transistors; this problem also becomes apparent when the unit is jarred; and/or 2. Component heating up and failing - more often than not it is an active component like a power transistor or power IC that starts to fail when running after sometime (due to heat buildup) again anywhere the power, vertical, horizontal section. You would need an aeresol spray of contact cleaner to spray on the suspected component to lower its temperature when the TV starts to fail. You need to be familiar with soldering, use of a VOM, circuit analysis and component level repair to properly fix the problem. Further there are dangerous high voltages inside a TV unit even with the power off. Likewise, the unit has to be diagnosed, run, repaired and tested with the back cover off. With these in mind, you might be better off seeking the services of a qualified TV technician. Hope this gives you an idea of the problem. Pls post again how things work up your end. Good luck and kind regards.

Posted on Aug 06, 2007

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