Question about Toshiba 55H70 55" Rear Projection Television

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Toshiba 46H83 convergence problem

After moving my tv, it looked ok, but I thought I'd hit the "touchfocus" button on the front to sharpen the convergence. I had never used that button before. It threw the guns way out of whack. Now the blue is tilted uphill, and adjusting the convergence via the remote doesn't fix this. Any idea what happened and how to fix?

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  • jmsiegel Jan 20, 2009

    thanks. is this something I can install myself, or is it a tricky electronics job with soldering, etc?

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There is no simple answer to this question.As a technician I know the inner workings or this unit.A couple of ideas pop into my head and the first thing that comes to mind is that the yoke of the blue picture tube was never properly aligned.Has this unit been worked on before?When you hit that perfect focus button the memory of that unit defaulted back to its factory settings.Did you recive a message that read "Factory Data Error?"

Posted on Jan 19, 2009

  • Albert Vasquez
    Albert Vasquez Jan 20, 2009

    If the blue looks tilted and not wavy I feel you may just need adjustments.The deflection yoke on the blue picture tube may have been loose and turned during the move.Changing the amps on this unit is no easy task.I do in home service but on this chassis it`s mandatory shop repair only due to dificulty level.Find a channel that has words scrolling at the bottom and take notice as to wheter they are curved or distorted in any way other than being tilted.Bad convergenge amps cause the individual color to be bowed or curved in some way.If you see no bowing or curves in the blue you may just need yoke alignment.

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Since this occurred during a move, I would first suspect bad connections. If you can solder, you can fix this yourself. First locate the convergence ICs. These are large black ICs attached to a heatsink that will be marked STK392-xxx. Try resoldering the pins on these ICs first. If that fails to resolve the problem, replace the ICs.

Let us know the results.

Dan

Posted on Jan 19, 2009

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Its the problem of convergence ic on the main board just will have to rep[lace that ic on the main board.number is 392 and there r 2 such ic just get it replaced,

Posted on Jan 19, 2009

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1 Answer

Toshiba projection tv model 57H82 color convergence is off. tried the TouchFocus and get and error. tried manually but the red will only move up and down. i need it to move left and right.


OK, the problem is one of the STK392-110 convergence amps has died. It is rare that both die at the same time, so either vertical or horizontal will go out, but not both. Also look for an open fusable resistor near said IC.

May 28, 2010 | Toshiba 57H82 57" Rear Projection...

1 Answer

I have red and green lines with a 3d effect on my screen at the bottom


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 photos of convergence problems.

42d3683.jpg

7859b01.jpg

e87380c.jpg
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 can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Jan 21, 2010 | Toshiba 46H83 46" Rear Projection...

1 Answer

Turned on tv have sound but no picture. toshiba 46h83


Most likely your convergence IC's are bad along with the two 5 amp pico fuses on the board to the left up front.

Oct 03, 2009 | Toshiba 46H83 46" Rear Projection...

1 Answer

Hey can any one help me with my Toshiba 46H83 rear projection hdtv? My screen is off center by about 3/4 of an inch to the right. The picture is prefect except for this. I've asked this question two times...


OK, need to go to service menu of TV and adjust HPOS data, you can move entire picture left to right or right to left to adjust it on TV screen.
Be careful NOT to initialize service data memory otherwise all convergence will be a mess.
How to go into Service Mode is written in service manual of TV.
Thanks.

Sep 05, 2009 | Toshiba 46H83 46" Rear Projection...

2 Answers

Toshiba 57H82 convergence problems. TouchFocus


See my solution <http://www.fixya.com/support/t2795690-convergence_off_blue_line_only_vertical>.
You need to get to the service menu--it's been 4 years so go to AVSforum.com to turn off the different guns and get the better pattern.
At your risk: To get into Service mode:
1. Turn your TV on. 2. For X81 or earlier series: Press MUTE on your remote and release. 2. For H80/H81/HX81 series: Press MUTE on your remote and release two times ("Mute" on-screen) 3. Press down MUTE on your remote again and hold. While holding, press the MENU button on your TV set's front panel. 4. Release both buttons. 5. An "S" should appear on your screen. Press MENU again on your TV. 6. Now you're in service mode. Channel Up/Dn - Scrolls through Parameters and Volume Up/Dn - Changes Parameter Value
To get into convergence mode:
Get into Service mode, then Hit '7' to bring up the convergence grid. Buttons 100, 0, and ENT control which gun you want to turn off (if you want to align the red to the green without seeing the blue gun and other variations). 2=up, 8=down, 4=left, 6=right, 3=change gun to converge, 5=converge that point. To exit convergence mode you press 7 once and your screen should look like it's imploding then return to normal and then you press 7 to get back into regular service mode.
I have more info found on the board. -Ken

Jul 31, 2009 | Toshiba 57H82 57" Rear Projection...

1 Answer

Toshiba 46H83 HD Projection TV with distored picture


if you are using an areal for your tv move your areal and see if it works or do the tuning for it .

Apr 19, 2009 | Toshiba 46H83 46" Rear Projection...

1 Answer

Toshiba 46H83 won't turn on...replace bulb???


this sounds like a power supply, or a fault convergence board.

did you notice any problems before it stopped working?

Nov 14, 2008 | Toshiba 46H83 46" Rear Projection...

1 Answer

65H81 remote and green screen


Yes you can get the service manual at the following link for 10.99 and they will contact you to see if you would like the manual emailed to you. Here is the link.
http://servicemanuals.vstore.ca/

Feb 02, 2008 | Toshiba 65H81 65" Rear Projection...

1 Answer

Green Convergence problem


O.K. This is a CRT Projection TV see http://www.tacp.toshiba.com/televisions/product.asp?model=50H82 The Manual is available from http://www.tacp.toshiba.com/tacpassets-images/models/50H82/docs/50H82_om_e.pdf , and this describes the Manual Convergence process, I doubt this will help, but it's step #1. The problem you are describing sound to me like a deflection problem. The electron beam in the green projection 'tube' (a super bright CRT) is probably not being controlled correctly. This can be caused by several things, from least likely to most :) I do not recommend that someone untrained in electronics attempt to service a CRT based television due to the potential for extreme shock or electrocution. That caveat said, here are the possibilities. #1 Physical Trauma: The TV has been shifted moved or bumped hard, and one or more of the fixed permanent magnets used to help convergence has come loose, or the CRT projection tube was damaged. I don't think these TVs use convergence magnets anymore, but it's possible. The green CRT tube failing would be more likely if all four corners were affected, but I've seen a failing CRT affect a single corner/edge before. I believe that this model has projection tubes that are separate from the colored filters, so swapping the tubes around may be possible. I do not have a service manual for this set, and this may be a hazardous operation due to high voltages. #2 Stray magnetic field: Someone dropped a magnet into the TV, and it landed close enough to the green tube to effect it only, or perhaps some other piece of equipment is effecting JUST the Green CRT (clock radio, speaker, badly designed wall wart, etc.). Removing the offending magnetic field may cure the problem. Perhaps the offending magnetic field has been removed, but it's presence is still felt. Try using the degauss function built into the TV set (I can't find one in the manual, but it may be present). You may want to try using a degaussing coil, and see if that helps the problem. Just be careful not to get the coil too close to the base of the projector tubes. #3 Deflection drive electronics: A CRT works by using an electron beam to excite fluorescent compounds on the face of the CRT. To move the electron beam about, a process called deflection is employed. Magnetic coils (the choke) are used to steer the electron beam up, down, left or right. These coils are driven by transistors, and as one fails, you will get an image that starts collapsing in the affected section. On a standard CRT TV, that would mean the entire image is affected, but a CRT projection display uses separate red, green, and blue CRT projection tubes to build the image, so you have three times the deflection, three times the possible transistor failures, and in your case, the odd result of just the green part of the image displaying incorrectly. This problem will probably require a service call, and a electronic board swap, but the problem could be the choke (the magnetic coils) on the green CRT projection tube. Swapping the green tube for another tube could prove if it's the tube or if the deflection electronics that are going out. Again, my feeling is that this is a deflection issue requiring a board swap (I doubt anyone actually does component level repair anymore) Sorry, I don't have a better answer, peace. Paul.

Jan 13, 2007 | Toshiba 50H82 50" Rear Projection...

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