Question about Zenith Z50P3 50 in. Plasma TV

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My Zenith 50" Plasma 50pc3db-ue will turn on, but will then immediatley turn off, what could be causing this?

I have unplugged the tv and even tried turning it off and waiting for a few minutes to turn it back on.

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  • Zenith Master
  • 3,904 Answers

This is usually the power supply. It most likely will need to be replaced.

Posted on Jan 20, 2013

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Posted on Jan 02, 2017

SD Tech
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SOURCE: Very noisy fan on a Zenith 50" Plasma (Model 50PC3DB-UE). Should I replace the power supply or just a fan?

if it has only one fan, replace that but look to see if fan dusty or not.

I have seen ones with two identical fans and one made noise and the other did not, swapped them and then knew for sure which was the bad one, in that case better to replace both fans at same time.

Posted on Dec 19, 2012

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Zenith plasma tv wont stay on model:z50pj240


This could be caused by multiple things. The first problem that comes to mind is a bad power supply in my experience. The second problem that comes to mind is possibly a bad t-con or backlight inverter board. Could you tell me, when the TV powers back off can you see a picture in on the screen if you shine a flashlight up to the display?

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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent.

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Power supply is the big board at the top middle, but a short on any board could do what you are describing, You need a Digital volt meter to trobleshoot further, look for popped or bulged capacitors or shorted components before purchasing more boards. Also look at Y-sus, Y Drivers (big board on the left 2 skinny boards.

Feb 17, 2014 | Zenith Z50P3 50 in. Plasma TV

1 Answer

Very noisy fan on a Zenith 50" Plasma (Model 50PC3DB-UE). Should I replace the power supply or just a fan?


if it has only one fan, replace that but look to see if fan dusty or not.

I have seen ones with two identical fans and one made noise and the other did not, swapped them and then knew for sure which was the bad one, in that case better to replace both fans at same time.

Dec 19, 2012 | Zenith Z50P3 50 in. Plasma TV

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Fixing the Zenith 50" plasma


The problem is probably a shorted Z Sustain board located on the right side of the TV when viewed from the rear. The board sells for about $220.00. The pop sound comes from the speakers because the audio circuit is not properly muted before power down.

Jun 09, 2008 | Zenith Z50PX2D 50 in. Plasma HDTV

1 Answer

Zenith plasma


dont get mad like i did, report this problem to zenith, they seem to be aware of the problem with this particular model.
i gave them the model number and they requested the purchase date, then extended the warranty and gave a number for a local repair shop which came for my set a couple days ago.
so far so good. it may be a while until i know whether the repairs will work, however hats off to zenith, so far, which seems to be providing appropriate customer service and standing by their expensive products.

Jan 14, 2008 | Zenith Z50PX2D 50 in. Plasma HDTV

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