Question about Zenith 12vDC 800mA 20W AC Adaptor A41208 (1500850) Power Supply
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
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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This is an indication of out-of-regulation in the power supply section. The very common caused of this fault is the leaky electrolytic capacitor in that section. It will drop the supply from normal voltage and will disable the unit.It needs a little warm-up to make itself stable but the symptom will get worst. Sometimes it has a bulged/dome at the top but not all, it is better that you have a capacitor checker/tester to determine its condition. Your unit will back to normal again if the leaky capacitor is isolated. Yes fixing the power supply is quite technical but in this case a little backround in electronics will be fine because electrolytic capacitor is the only parts that are going to be replace. If you don
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