Question about Zenith R56W28 56" Rear Projection Television

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NO PICTURE...BUT SOUND

Have a Zenith model #Z56296D8 that recently the picture started to get darker. Now the picture is black, but when I change channels I can hear the channels fine. (3) years ago I replaced the High Voltage Module, is this the culprit again?? The TV is in a heavy smoking environment, does this effect the module?? PLEASE HELP!!!! Thanks, Steve

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  • Glenn Wilkie
    Glenn Wilkie Mar 23, 2014

    My Zenith R56W28 had gotten progressively darker to the point where you could barely watch it.I opened the top (projection) compartment on mine and blew it out with an air pump.Helped a little.Then I took the screws out of the left half of the back on the lower compartment where the electronics and power supplies are located.Stuck my air pump hose in and blew out all the dirt and dust.Checked the picture and it was as good as new!I love these TV's!First problem I've had with it in 15 years!Practically bullet proof!

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Your HV circuit is defective. Most likely horizontal output transistor is shorted and you may need to replace the flyback. You need to call an expert.

Posted on Jun 08, 2006

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The picture does not seem as bright as it was


This rear projection from the model number appears to be a RCA AND not the zenith listed in your question.

If RCA the lens for the tubes may be dusty or dirty--should be cleaned once a year.

Process is simple: unplug set and remove rear cover.

Locate the three large black lens at top of chassis and either with a lens cloth or a paper towel with glass cleaner sprayed on the towel clean them.

If they are dirty/dusty they will make picture look darker and duller than it once was---they are the light source for your picture.

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Zenith sets, like most others now, are adjusted electronically through a service menu. You'll need your original remote control (or a Zenith-brand universal replacement with a MENU key) to access the menu. Press and hold the MENU button until the channel number and time display goes away, then press 9, 8 , 7, 6, ENTER. This puts you into service mode.

In service mode, CHANNEL UP and CHANNEL DOWN move through the different settings, and VOLUME UP and VOLUME DOWN change the values. Make sure you write down the original value of anything before you change it so you can put it back if necessary. One of the reasons the manufacturers hide the service menu is because the set can be damaged by incorrect settings to some of the parameters.

On some models, you can't get to all the parameters unless you change one called F MODE from 00 to 01. You might need to do this on yours.

The list of parameters varies by model and features. I haven't worked on a Zenith in a long time so I don't remember exactly what yours says, but you want to find two settings for V SIZE (vertical size) and V POS (vertical position). Adjust the size first by lowering the value until the top and bottom of the screen are black. Then adjust the position so the picture is centered (black strips close to equal size). Finally, increase the size until the picture fills the screen again. It's normal to adjust for a little overscan, meaning you push the top and bottom a little bit out of view. If you stop too soon, on some channels you might see flashing lines at the top of the picture.

When you're finished adjusting, turn the TV off to exit service mode. If you needed to change the F MODE setting, put it back to 00 first. Your picture should be properly sized after all this.

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2 Answers

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Please take the time (5 min) to file a complaint with www.consumeraffairs.com...you will see that you are not the only one with this exact same issue on this zenith plasma model Z50PX2D:
http://www.consumeraffairs.com/search.html?cx=partner-pub-0200629403145096%3Aqt7mbbqybbg&cof=FORID%3A10&ie=ISO-8859-1&q=zenith+plasma+#1124

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1 Answer

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2nd if you see a black square on the screen of these channels turn off the closed caption, again in the menu

and if all else fails hook up cable or sat box from the video out to the video in on the tv, set the tv to video input viva remote or going to channel 00

hope this is of some help

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