Question about Toshiba 42H81 42" Rear Projection Television

1 Answer

All Dots, no clear picture

I have had this TV from Sept 2002. But this problem has got me stumped. When I turn on the TV, I have all the colors (red, blue, green, etc) in dots, but no clear picture. Sounds and all the effects are there (color shading, etc) It seems that the picture is scramble? Any thoughts???

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 150 Answers
Re: All Dots, no clear picture

Might be the Flex Converter Module, They have issues at about this age. I think there are some bad caps in the module, dont know for sure always sent in for rebuild. If you dont know alot about these, these toshibas are a pain to pull apart and back together working, you might want a professional to do the work.

Posted on Jul 06, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

2 Answers

There is a humming in back of tv.the sound always good but picture doesnt come thru and i get a green screen someetimes blurry with distortion.color wheel or dmd chip or lamp starting to go out

as my experience, the most possible reason should be the color wheel or its photo sensor board.

firstly try to clean its photo sensor board, or have to replace a new wheel.

i just have this wheel, when you need to replace it, contact me freely

May 02, 2016 | Projection Televisions

2 Answers

Magnavox Rear Projection 51MP392H/17 has ghosting issue double hallow. TV is six (6) years old. any idea what's wrong?

If this happened suddenly and the red and green images are bowed in at the center of the top, bottom and both sides, one of the convergence amplifier IC's has failed. The part number is STK392-120. Make sure it is a genuine Sanyo brand replacement; there are a number of cheap imitations out there that do not last. Generally they cost less than $30 each.

Note: there are two of these in each TV. They are notorious for having a high failure rate, so I usually replace both. (FYI: each chip has three amplifiers. Each color gets two amplifiers, so one color uses an amplifier on each chip. That's why we usually see at least two colors go out of whack when this problem happens.)

I assume you have already tried a different video source (DVD, VCR, etc.) to rule out input signal defects. If the problem arose right after the set was moved, either the optical alignment was disturbed or (less likely) there is a stray magnetic field near the set that is causing problems (magnetron from a microwave oven?). There is a procedure (sometimes provided in the owner's manual) for adjusting convergence using the remote control that can fix minor alignment problems. If you want to gamble it is not a hardware failure, try it first along one edge of the picture.

If you cannot shift the red or green dots in the convergence pattern, stop immediately, and make a note of where and in what direction you tried to move the dots. Inability to converge the dots is a strong indication the convergence amplifiers are bad (that is their job - to keep the colors lined up with each other). You will need to undo any adjustment attempts after you replace the convergence chips and any fuses or resistors that got burned when they went out, so don't make too much extra work for yourself or your service tech.

Oct 27, 2010 | Philips Magnavox 51MP392H Rear Projection...

2 Answers

Can i realine the lens myself it has a yellow tint and yhe lettering is out of focus

If you have yellow coloring on everything, this is not a lens alignment problem. Either you have a color balance problem (weak blue) or the coolant fluid in one or more CRTs is going bad. The coolant liquid is supposed be clear, but with age it breaks down and turns yellow.

First, unplug the set and remove the back. Use a mirror if you have to, but look down at the top of each CRT using a bright light. They should be colored red, green or blue, with no yellow to muddy the color. That's a quick check on the coolant condition.

You can replace the coolant, but be very careful not to spill any inside the set. Broken-down coolant can short out electronics and cause a lot of damage to the circuitry, especially in the high-voltage sections. Some people prefer to remove the CRTs from the set for this process, but that is a considerable amount of work. Others use kits with pumps to remove the coolant, and work inside the set with reasonable precautions - if there is enough room. There are a number of good tutorials on-line, or at least there were when I last looked two years ago.

I recommend getting the color right before attempting the focus. Bad coolant may scatter the light and fuzz up the picture, so check that out first and post back what you find.

If you have yellow fringes on otherwise normal colored objects, the blue convergence is off. This will also make lettering appear out of focus. Most RPTVs have a procedure for bringing up a convergence pattern (a grid of dots) using the remote control. The dots should all be white or have very little color fringing. Follow the directions, and make small adjustments, then check the effects all around the picture. Correcting one section may cause a change elsewhere. Use a ruler to make sure the dots stay in the right place; otherwise you may end up with a distorted picture.

Caution to other readers: do not try to adjust convergence if you have a "bow-tie" shaped picture in one or more colors. This indicates a convergence amplifier failure, which must be fixed first.

Oct 12, 2010 | Samsung HCN5527W 55" Rear Projection...

1 Answer

My five year old Toshiba 57H84 rear projection TV has a pink tinted screen when you first turn it on, then after it warms up, the colors are all fine but then the picture has evenly spaced blue tinted...

Hi,Yes your problem sounds like the DMD board.This is how it works: Basically the light of the lamp goes through a tunnel that carries a color wheel(rotating disc with a gamma of colors that creates the colors on your tv)then the light of the lamp goes through the DMD board which is a chip composed of around 2 million pixels that creates the images and colors.When it starts to fail it will create black bars,pixelation,color distortion or white dots on screens. Here's a video that will help you find where the DMd chip is located : Have a blessed one!

Apr 30, 2010 | Toshiba 57H84 57" Rear Projection...

1 Answer

We purchase a Hitachi TV #42V515 Sept 2005. We

Go to the place you bought it from and ask them, to me it sounds like your color wheel is going.

Nov 20, 2009 | Hitachi Projection Televisions

1 Answer

Converge off a little and screen has green tint

If you have the remote, go to the setup screen and move the picture. Converge has nothing to do with where the picture sits but, where the red, blue & green dots land. All you should see are pure white dots. There should be absolutely NO color ghost anywhere on the screen. If so, you need a bar / dot generator to set the convergence to center the dots.

Jan 12, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Hitachi 55FX20B 55 in. Rear Projection - no picture or sound

TV always has high voltage shock risk while repair. As you said you are not familiar with TV repair so better to handle repair person this issue.

Oct 01, 2008 | Hitachi 55FX20B 55" Rear Projection...

1 Answer

Three color dots

check out self test first, look at threads here or

Dec 31, 2007 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

Tilted tv screen

The complete convergence for the Philips projection sets usually requires a clear plastic overlay which fits over the screen and has many precisely spaced black dots. The remote is then used to enter the service mode and converge all 3 colors onto the dots, and then the settings are stored in an EPROM IC. This should only be done by someone with experience with the Philips sets.

Jun 25, 2007 | Philips 55PP9363 55" Rear Projection...

Not finding what you are looking for?
Toshiba 42H81 42" Rear Projection Television Logo

Related Topics:

54 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toshiba Projection Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers

Dave Naylor
Dave Naylor

Level 3 Expert

834 Answers

The Knight
The Knight

Level 3 Expert

66587 Answers

Are you a Toshiba Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides