Question about Samsung HCN4226W 42" Rear Projection HDTV-Ready Television

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Marks on Screen

I picked up this unit second hand unit. There are some bright magenta marks that are vertically aligned in the centre of the screen. They look like drops of liquid but this is only visible when the unit is on. Is this likely something that needs to be cleaned inside the unit?

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Re: Marks on Screen

These are burn marks on one of the picture tube, probably the green one from the looks of your picture (the absence of green will leave red and blue)This happens as the result of some kind of previous failure, hopefully that has been repaired now. However the marks will always remain unless you replace the green picture tube which is costly and which is why they sold the tv. Sorry about the bad news, if you decide to have somebody replace the tube for you make sure they look for what burn't it in the first place it could be intermittant and waiting to happen again to your nice new tube. Although seeing what model this is this tv did like to do this when the convergence failed in which case it looks like that has been repaired already. Good Luck, hope you didn't pay too much for the TV.

Posted on Apr 25, 2007

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The entire screen will not align with the reference marks and the red / blue convergence lines don't line-up across the screen

This tv 100% have a convergence problems,it dead.The tv convergence board,must require changing 2 STK convergence ICS and some or all it resistors.U have tools like a soldering iron,desoldering pump and solders?Know basic electronic,can u do soldering?Tries website like, to buy a convergence kit to do the repair ur self.Or the shop,will cost u $300-350 for parts and labors.

Sep 06, 2010 | Panasonic PT-47WX53 47" Rear Projection...

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LINES THROUGHOUT SCREEN AND COLOR NOT SO CLEAR AND BRIGHT. Vertical lines on screen and the color is very dull. It's not bright. Is it somehting simple to fix or forget it...? Thanks

It sounds like you are at the end of the useful life of your unit. It is a CRT projection unit and when the colors get dull, picture gets dim and especially when you have lines on the screen indicating retrace problems the CRTs are shot. Cost to replace would be more than new. I would recommend a DLP. Of all the schemes out there I think they are the best looking, least prone to breakdowns and most cost effective. Let me know if you need more help. Thanks for using FixYa and for the generous rating.


Mar 19, 2010 | Samsung HCM4216W 42" Rear Projection...

1 Answer

My big screen panasonic tv has a double fuzzy picture what am I supposse to doto fix it

Adjust the convergence or reset it to factory default. Use only the remote when adjusting convergence. The front controls have no effect.
  1. Press action button to enter MENU.
  2. Navigate to SETUP.
  3. Scroll down to CONVERGE.
  4. Press VOL > to select.
  5. Press CH buttons to navigate up or down.
  7. Press VOL > to select.
  8. If CONVERGENCE ADJ is selected the align Green to Center screen will be displayed.
  9. Use the navigation buttons on the remote control to align the horizontal and vertical green lines on screen, with the cabinet reference marks on top center and left
    center of cabinet.
  10. Press ACTION button to display red center correction screen.
  11. Use the navigation buttons on the remote control to align the red cross with the white cross pattern at the center of the screen. To prevent picture tube damage do not leave test pattern on for an extended period of time.
  12. Press “0” on the remote control keypad to display the BLUE center correction screen, repeat procedure for adjusting blue. If needed press “0” again to return to RED correction screen. An adjusted cross pattern appears white with a minimum of color protrusion.
Remote Control must be in TV mode.
  1. Press ACTION button to display red correction screen.
  2. Press the 1 through 9 keypad buttons on the remote control to select the desired convergence position.
  3. Use the navigation buttons to align the RED cross with the white cross pattern.
  4. Press “0” on the remote control keypad to display the BLUE correction screen, then repeat procedure.
  5. To exit press ACTION button repeatedly, then press CH up.

Nov 07, 2009 | Panasonic PT-47WX53 47" Rear Projection...

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Scratch in sreen

By the looks of that picture, it's hard for me to believe that the scratch is not on the outside of the protective plexiglass screen. However, you can remove the protective screen w/o negative effect of the picture. In fact, it will probably reduce the glare from light on the screen. If, in fact, the scratch is still seen w/o the protective screen installed, then it is the lenticular screen that is scratched.
The lenticular screen is the one with the vertical grooves from top to bottom in it. The fresnal is the back screen that appears to have been lathed in a circular pattern.

Jan 07, 2009 | Toshiba 61HX70 61" Rear Projection...

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Green convergence on Panasonic PT-53WX42 is not ligning up...

Does not sound like the chips are bad.
What you need to adjust is "SKEW". You need to enter "service Mode" then go into "Coarse Convergence". Skew can be adjusted for all 3 colors. Unless you have the service manual, these corrections should not be attempted.

To clean the INSIDE of the screen, you really have to disassemble the TV. Remove all the screws that hold the "back" ( the piece with the mirror) to the front (screen) assembly.
The screen can be cleaned with a solution of diluted isopropyl alcohol, no more than a 50% solution. Drugstores will carry it, but it might be 70%-90%. Just dilute with distilled water (not tap water as it contains minerals). Personally I have used 70% with no ill side effects but 50% is recommended.

Dec 08, 2008 | Panasonic PT-53WX42 53" Rear Projection...

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Intermitten snowy picture

well the vertical deflection IC is good but you need to get the conversion chip for it , it controls the vertical , horizontal, color, color alignment ,
it would be wise to get it done soon before anymore dammage is done

Oct 15, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

4 Answers

Smudge marks???

If they are grease marks you can use a warm water a soft cloth like a t-shirt and little dish washing liquid. Gentley wipe the area only stroking down or up--- NEVER SIDE TO SIDE---. Have a dry cloth ready if you drip water down the screen. Now if those are scuff marks, your done, they cannot be removed. They are like the old record albums with the grooves, once the grooves get distorted that's it. Good luck.

May 07, 2008 | Toshiba 46H84 46" Rear Projection...

1 Answer

Red screen on 50" toshiba rear projection

red tub bad, you can adjust the red tub when you take the lower part of the front panel off and the plastic cover under the front screen
there will be 6 controls on the right hand side the three top are the brightness look for the one mark "R" and see if turning it down helps.

Dec 02, 2007 | Toshiba 50HX81 50" Rear Projection...

2 Answers

Sprayed Screen

Take a look at this relevant post:,p211196/RCA-P61927-61-in-Rear-Projection-Television.aspx It's possible that the cleaning agent in the spray has dissolved the screen. If it is the lenticular lens(the vertical lines) there will always be permanent marks from the spray until it is replaced. You can try a toothbrush, dry and carefully scrape the material out of the grooves. there's also the Endust Product made just for this type of thing, It's called Endust for Electronics, and I heard it works like a champ. Another option is a dry-cleaning solvent, trichloro-ethane, which you can find at many hardware stores. This will wipe crayon marks right off of glass without any scrubbing at all. Plus, it's harmless to most plastics. Also heard of a product called Tough and Tender, that should be ok with a screen. you better consult JVC on any material you plan to use though. Major problem is in case the spray dissolved the screen. Don't be hard on the kid, encourage him and he might be a great graffiti artist ;]

Jun 09, 2006 | JVC AV-65WP55 65" Rear Projection...

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