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We have several Zenith Presentation TVs in our classroooms that were recently placed there from a building that was closed in our district. Many of the tvs now will not power on. Whenever you hit the power button (either on the tv or with the remote) it will click on/off almost instantly. Any idea how to resolve this issue?

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100uf,35volt capacitor is bad in the power supply. Take the back off. Follow the power cord to the main board. Straight in front of where the power cord goes into the board you will see a heat sink (tall metal) that has a transistor attached to it. Right next to the transistor will be a small capacitor about the diameter of a #2 pencil and about a 1\2 inch tall. There are only a couple of capacitors in this spot on the board, just make sure you replace the one that is marked 100uf, 50volt. Replace this capacitor and the sets will work. Let me know if this works, please. If it doesn't work, let me know the sets' model # and I'm sure I can assist you further. Have a great day!!!

barneyluc

Posted on Oct 03, 2008

  • Barney Lucas Oct 03, 2008

    Hello again! I listed the bad capacitor as being rated at 35 volts and then I say 50 volts later on. You need to replace it with a 50 volt capacitor. It's capacitance value is 100 micro farads or 100uf.

    Bye, barneyluc



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There are two types Zenith TVs. One type will have "Menu" button on its front panel and other will not. If your Zenith is the first type, you can programme it without a remote control. If it is the second type, you must have a remote control hanset to programme it.
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Does anyone know were to get instruction manual IQ3557CC


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http://www.retrevo.com/support/Zenith-IQA36M46W-TVs-manual/id/277ci277/t/2/

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Zenith Presentation Capacitor


Hello again! Sorry, I was not more exact... capacitors are not all alike...too long to go into...100uf 50volt Electrolytic Capacitors are what you need.
I always use the phone to order what I need and when you tell the parts person you need a 100uf 50 volt cap it's already understood that you want Electrolytic capacitors. It' s pretty rare to have to order the other types of capacitors as they are extremely long lived and are not in "high stress" circuits anyway.
Can you please tell me the model # of these sets. I will obtain (if I don't already have it) the service manual and make sure I am telling you 100% correctly what your problem is. Zenith tv's have always been notorius for this problem all through the '80s \ '90s \ early 2000s though. That's why I am telling you it is this same capacitor in all these sets
It makes me happy to help a school too! I am the single Dad of two elementary school age girls.
Is your school system in the USA? Just curious... Hope you have nice day!
barneyluc

Oct 06, 2008 | Televison & Video

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