Question about Toshiba 55H70 55" Rear Projection Television

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Double imaging my tv shows double color images. do I need to replace the RPTV lamp?

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Re: double imaging

The Toshiba 55H70 is a standard rear projection set. It does not have a "lamp", it has 3 picture tubes. When the colors suddenly do not line up on the screen, it means that one of your convergence output IC's has burned out and needs to be replaced. This is very common on those sets. If your set is using the STK392-110 IC's, it is probably a good idea to go ahead and replace both IC's with the newer upgraded STK392-150 IC's. The IC's should be replaced and the convergence circuits realigned by a qualified tech familiar with Toshiba projection sets.

Posted on Sep 11, 2007

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The old projector TV's are using 3 lamps for Red Green your case the Green lamp stopped working....either the Green lamp burned or the lamp board is defective.

Mar 31, 2016 | Toshiba Projection Televisions

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My jvc has picture but it is double and reversed

Double Image JVC - AVS Forum ' Home Theater Discussions And Reviews

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Have a JVC 52 , only a few months old. ... That looks like my CRT RPTV if I mess with the convergence. ..... I hope your repair isn't that drastic, but you won't know until after the service tech gets there. .... Started out with a double image, then mirror image, then finally the blue and red went out totally leaving ...

Jan 01, 2016 | JVC Projection Televisions

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Lamp light blinking red

From your description it sounds like the lamp bulbs needs to be replaced.
You need one of these:
NOTE: DO NOT TOUCH THE GLASS PART OF THIS BULB. The smudges from your fingers can show up on the image projected onto your screen and make things look blurry.
Once you have the new bulb then turn off the TV and unplug it. On the back panel there is a rectangle on the left with a screw holding it on. Use a philips head screwdriver to loosen the screw then slide the rectangular panel to the left and pull it off. Inside will be the old lamp bulb. Use the screw driver again to remove the screw holding the lamp bulb in and pull the lamp bulb out (it may be hot). Insert the new bulb and then screw it back in. Place the panel back on and screw it back in as well. Make sure the screws are tight or the TV may not turn on. You can now plug the TV back in and turn it on. If done correctly this should resolve the issue.

May 07, 2013 | Hitachi 50VS69 50" Projection HDTV

1 Answer

The picture is showing a double image and is distored.

The problem you are refering to is more than likely a convergence problem. The convergence circuit in your tv is controlled by an IC (integrated circuit) stk392-110 and it makes the 3 colors (red, blue, green) line up/converge together to create a clear picture. You'll know when this part needs to be replaced because the picture you see is 3d looking and possibly bowed on the top or bottom or on the sides in any or all 3 colors.

Jan 24, 2010 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

JVC AV-56WP74 Colors quit working or went out of balance.

Guns or CRT are probably ok. Your TV needs a convergence IC STK392-120 replacement. Lamp are used on LCD and DLP rear projection TV's. Color wheel are for DLP's. :)

Dec 26, 2009 | JVC Projection Televisions

2 Answers

Color is separating (red and Green double images

Yes everything is repairable.....
The problem is in the Croma section of the TV
some times it ma happen due to 99% of moisture.........
Try Hot air Blow drying for 1 HR in side the TV i.e on the circute and blow clean if any dust partical are there
and then re check
if the problem the TV repai expert or the service centre....
May the Croma chip needs replacement....

Sep 20, 2009 | Mitsubishi WD-52525 52" Rear Projection...

1 Answer

My picture won't show after replacing the lamp

Actually that humming sound was not the lamp, the humming sounds come from color wheels when they're going out, and since the color wheel is part of the light engine system and it's not working, that's why you don't have an image, you'll probably ask your self why, since it's not the lamp.. the thing is that the light engine system is componed by lamp, ballast, color wheel and dmd board, so when one of these doesn't work, there will be no image reflected, because they work together

Jul 21, 2009 | Samsung HL-P5063W 50" Rear Projection HDTV

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Samsung HCN4727W Rear Projection TV, green screen, audio works

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai2_bing.gif,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya

Jul 10, 2009 | Samsung HL-R4667W Rear Projection...

1 Answer

Double screen image

Double image shows that TV got problem of Convergence Out ICs failure and will be replaced two ICs mounted at D Board of TV.

ICs, STK392-360 are available in Part Store, click to see an image and price info.

Apr 27, 2009 | Sony KP-65WS500 65" Rear Projection...

2 Answers

Double Image Red and Green

Here are some of the most common symptoms and example photos of a convergence problem

  • 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.

Here is a quick test....

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

Try to adjust the red and then the blue 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.


You need to replace the convergence chips and convergence resistors. Check the site They have put together a kits for most models. If you don't see a kit for your set send them a quick email and they will put one together for you. Their kits includes photo instruction guides, original Sanyo STK chips, convergence resistors, pico fuses, etc.

Feb 08, 2009 | Sony KP-46WT510 46" Rear Projection HDTV

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