Question about Panasonic PT-47WX42 47" Rear Projection Television

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47wx42 - wavy red and green "bars" on top and bottom of screen

Turned on the tube and am now seeing red and green bar areas at the top and bottom, along with seeing these red and green areas offset (like a convergence problem). Is this the evil STK392-180 chips gone bad??!! Thanks

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Re: 47wx42 - wavy red and green "bars" on top and bottom...

Replacing the two STK392-110 ICs didn't do it for me. But you can try. I am experiencing the same problem, and it appears that is not possible to correct the problem with the ajustments in Service Mode. Please let me know if you find a solution to this problem. TIA.

Posted on Dec 30, 2006

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The Blue color is double imaged and when i do the magic focus, red and green do fine but blue the "bars" at the top are smudged and there are no bottom bars showing.

Projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both. Repair kits with instructions are also avail from

Common Problem #1) Convergence has gone out

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 projection 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 pics of convergence problems.


69189a5.pngSOLUTION #1

For more more examples and find a fix using this link on Fixya

Common Problem #2) CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

TV set after fluid change



You can see some more examples and find a fix using this link on Fixya

Feb 27, 2011 | Hitachi 53UDX10B 53" Rear Projection...

2 Answers

Projection HDTV Pansonic 47" Curving blue and green colors on top and bottom of screen.

You will need to replace your two convergence I.C.s.They are two large IC mounted on a large aluminum heat sink.Replace both,look for any burned resistors near them,replace those if needed,and readjust your convergence. Good Luck

Let me know if you need any further help

Mar 29, 2008 | Panasonic PT-47WX42 47" Rear Projection...

1 Answer

I own a Panasonic HDTV projection monitor PT-47WX42C I am having convergence/warping issues; There is a large green/red curve in the bottom rear of screen about 4 inches tall, and stretching over more...

Replace the convergence ICs they will be big black ICs and will have Part number on them example STK392-110
Mats Electronics has them for 9.95 each you will need 2 .

Sep 10, 2010 | Panasonic PT-47WX42 47" Rear Projection...

1 Answer

Red wavy lines at top of screen.

Rear projection t.v.s work differently than most. They have threw lights that throw the picture onto the screen, instead of having a color tube that is in a traditional television. It would be my suggestion to bring it to a Qaulified T.V. professional to have watever bulb is bad replaced. odds are it will either the blue or the green(hard to remember exactly but i think its a green one lol) and not the red.

Jul 29, 2009 | Hitachi 51F500 51" Rear Projection...

1 Answer

Convergance problem

replace the two STK392-110 convergence ICs. You can get replacements at the following link with free installation instructions.

Sep 14, 2008 | Panasonic PT-47WX42 47" Rear Projection...

1 Answer

Wavy Red lines

hi there,
if you are familiar with electronics you can do this :adjust voltage at hight voltage block it has screen and focus written on it and comes from flyback transformer,but be careful cause it can be to dangerous if you touch something else,ah,ah adjust only the one that says screen and has a R on top,that means red,ok,thanks.

Jun 19, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer


You have a convergence problem. Components are shorted out and must be replaced. Unless you're a technician, there's really nothing you can do at this point.


Feb 03, 2008 | JVC AV-56WP74 56" Rear Projection...

2 Answers

I am told my Hitachi 61SDX01B (UltraVision/Ultrascan) has "Green Geometry"

Sounds like a convergence promblem.

Here are some of the most common symptoms of a convergence problem.

Screen looks 3D
One or more colors can't be adjusted when using the convergence menu.
Screen is bowed in or warped.

Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence or magic focus section.

Try to adjust the convergence.

You should be able to move them up, down, left, and right.

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

Its a fairly easy fix on the Hitachi sets.

You can get a repair kit that includes all the parts from The kit includes a photo instruction guide, original Sanyo STK chips, convergence resistors, etc.
Everything you need to fix it yourself.

Oct 15, 2007 | Hitachi 61SDX01B 61" Rear Projection...

1 Answer

Hitachi 61SDX01B

The problem is called green geometry.There is nothing wrong w/the green pix tube.It is critical to get the green geometry

accurate because the red and blue convergence overlays on

the green.If you have more than an alignment issue,that will need

repair before adjustments are attempted.

Oct 15, 2007 | Hitachi 61SDX01B 61" Rear Projection...

1 Answer

What is the life of a big screen tv?

Sounds like the veritical circuit has a bad capacitor. The cost is dependent on the servicers in your area. It can also be dependent on whether you take it to the shop or have a servicer come to your home. Look on a Mitsubishi website to find a servicer in your area.

Feb 07, 2007 | Mitsubishi VS-50607 50" Rear Projection...

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