Question about RCA P56940 56" Rear Projection Television

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Bad focus I have a p56940 by rca and the focus is off. Is there a way to adjust it?

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Yes after removing the back you will see tree transformers on the main board. it has three adjustment controlls on it ... the top one is focus. most of the time if you clean the lenses and mirror that will clear up fuzzy picture problem but some times the coolant is low or contaminated in the projection lenses

Posted on Nov 28, 2008

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Will not turn on makes thumping noise for a few seconds and than nothing happens


Short either in the audio circuit or the part of the power supply that sends power to the audio circuit.

Dec 09, 2012 | RCA P56940 56" Rear Projection Television

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Showed shadows a few times, so I turned off and back on . Now it will not come back on.


Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projeciton sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.

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Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix

69189a5.pngCONVERGENCE SOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from TvRepairKits.com or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

Jan 11, 2010 | RCA P56940 56" Rear Projection Television

1 Answer

RCA P46921. Just changed flyback.


First, this assumes nothing else is going on to cause it. Here's what I did. Go to the 'green grid' via the v76 menu and go through the alignment there. Notice that there are red letters, blue letters, and a green grid. While you are in this screen, adjust the red, green, and blue focus watching the individual color's item until they are in focus. If they won't focus here, they won't focus and you have something else wrong (what I do not know). Then, return to normal programming, then select menu on the remote, then screen, then adjust projection tv convergence both horizontal and vertical crosshare. That ought to get it.

Mar 16, 2008 | RCA P46921 46" Rear Projection Television

2 Answers

No power


The P56940 uses the PTK195 series chassis. The most common reason for that chassis not running is a shorted flyback (high voltage) tansformer. Sometimes a shorted flyback transformer will also cause the horizontal output transistor to short, and then the power supply will "chirp" when plugged in. The set should be serviced by a qualified tech familiar with the 195 series chassis.

Aug 27, 2007 | RCA P56940 56" Rear Projection Television

1 Answer

RCD 52W20 with no green...


Re-check hook up on focus/screen adjust assembly.Adjust RGB screen controls.All green/ no control can be bad green CRT==check w/CRT checker.CRT OK/==diagnosis required.Green video drive circuit??

Jul 30, 2007 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

RCA D52W20


Check for smooth,accurate adjust of RGB focus located up front behind speaker grill.If jumpy or inaccurate,replace RGB adust block.If that is not the cure,you may have bad CRT(s).

Jul 19, 2007 | RCA D52W20 52" Rear Projection HDTV-Ready...

2 Answers

*** I have to configure Colors with each power on. ***


The six controls you appear to be adjusting are the screen and focus controls for each of the three picture tubes. These usually only have to be adjusted as each picture tube ages or when replaced. You may either have a defective "focus block" i.e. the black box you have been adjusting, or the CRT's themselves may be going bad at this age. You will probably be money ahead to just replace the TV with a new HDTV set. At 13 years old, it shouldn't have much life left in it anyhow.

Dec 29, 2006 | RCA P46924 46" Rear Projection Television

1 Answer

RCA 46" Rear Projection TV - Picture is Blurry and RED


That sounds like the screen and focus controls you are adjusting. It sounds like you have a bad HV Splitter inside the TV. #205064 or #204809 Depending on your model number. http://www.matelectronics.com/acatalog/Mat_Electronics_Replacement_Parts___TV_134.html sells them for about 20 bucks.

Dec 27, 2006 | RCA P46812BL 46" Rear Projection...

2 Answers

Misconvergence


Convergence on RCA P56940 chassis PTK195 can only be done by service center with RCA Chipper Check computer interface box. Sounds like possibly missing -15 volt or +15 volt supply to digital convergence circuit, bad i.c.'s U19503 or U19504. Supply voltages come from regulator supply transformer T19701 diodes CR19707 (-15 volts) and CR19709 (+15 volt)

Dec 22, 2006 | Panasonic PT-53WX53 53" Rear Projection...

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