Question about Toshiba 50H82 50" Rear Projection Television

1 Answer

Green Convergence problem

After just over 4 years of good service, the green color on my Toshiba 50H82 is off and appears to be displaying on an angle. When I try the Touchfocus, I just get Touchfocus error once it goes through the Touchfocus process. During the Touchfocus, the Red and Blue lines look good, the green vertical line looks good except on the right hand side where in angles in at the bottom of the screen. The green horizontal line has a wave in it. The line starts out OK at the bottom right, but then creates a wave near the middle of the screen and then angles back down at the bottom left. Any words displayed in the middle of the screen have the green color displayed about 1/2 inch above the other colors. Also images on the screen look like an image from an old 3D movie. I tried the manual convergence adjustment, but only the Red and Blue can be adjusted. If anyone can help with advice on what the issue is and an estimate on repair cost, that would be helpful. Also any advice on if it is worth having this fixed, I like the TV and anyone visiting always commented on the great picture it had, but I have been looking to upgrade to a 1080P set. This may be incentive to make the switch. As a side comment the extended warenty ran out 80 days ago, isn't that always the case? Thanks in advance for any advice.

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  • nicnac4 Nov 07, 2007

    After just over 10years of good service, the green color on my Toshiba 50H50 is off and appears to be displaying on an angle. When I try the Touchfocus, I just get Touchfocus error once it goes through the Touchfocus process. During the Touchfocus, the Red and Blue lines look good, the green vertical line looks good except on the right hand side where in angles in at the bottom of the screen. The green horizontal line has a wave in it. The line starts out OK at the bottom right, but then creates a wave near the middle of the screen and then angles back down at the bottom left. Any words displayed in the middle of the screen have the green color displayed about 1/2 inch above the other colors. Also images on the screen look like an image from an old 3D movie. I tried the manual convergence adjustment, but only the Red and Blue can be adjusted.

    If anyone can help with advice on what needs to be done?

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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.

Posted on Jan 13, 2007

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1 Answer

How to align,calibrate


I can tell you how to enter the service menu for Convergence:

Mute,

Mute and hold and while holding then press Menu on front of set

A "S" should appear in upper right corner of screen (means Service mode is engaged).

Press menu again for convergence mode

Press 7 and grid of lines will appear

3 will rotate which color can be adjusted (DO NOT ADJUST GREEN!)

You navigate with 4 to go left, 6 to go right, 2 to go up, and 8 to go down.

5 will stop blinking cursor on screen

With cursor not blinking the same 4,6,2, and 8 will adjust at the point on the screen where the cursor is

5 will make cursor blink again so you can navigate

PRESS 7 to save adjustments and exit.


This set can be a little difficult to get into the "S" menu---you have to do it just right.


Regards, SD TECH


0874d68.jpg This is a typical Toshiba remote---almost any one will work.


IF THE PHOTO AND THE INFORMATION TOLD YOU SOMETHING YOU DID NOT KNOW: Rate this solution as very helpful as I do this here for free.

Aug 13, 2010 | Toshiba 50H82 50" Rear Projection...

1 Answer

Blurry picture and purple and green color on top and bottom screen, cable channel indicatoe showing doubled


Tv have a problems known as a convergence problems,it dead.The tv convergence board,require 2 STK convergence ICS and some or all it resistors to be replaced to solved the convergence problems.The shop will,cost u $300-350 for parts and labors.

Aug 08, 2010 | Toshiba 50H82 50" Rear Projection...

1 Answer

Color appears out of alignment. The set has


Replace the STK392-110 Convergence ICs and the 6 1.8 ohm 1watt resistors. You can get the repair kit whcih also contains the instructions from www.tvrepairworld.com

Nov 24, 2009 | Toshiba 50H82 50" Rear Projection...

1 Answer

Hi I have a toshiba 50h82 tv that is 7 years old with a convergence problem with the red and green lines that is going to cost $400 to fix but now that I am thinking about it before the convergence problem...


You are describing 2 different problems. The convergence problem can be fixed by either resoldering the convergence ICs or replacing them. These ICs cost about $25 each and there are 2. I suspect that the $4oo is for replacing the convergence board. This should not be necessary as the board can be fixed. Also, the brightness problem can be dirty CRTs, dirty mirror or faulty coolant fluid on the CRTs. If the picture was good prior to the convergence problem, the set is probably worth the repair if you can get the board fixed. While the board is being repaired, the service shop should be able to tell whether or not the brightness can be adjusted.

Dan

Oct 12, 2009 | Toshiba 50H82 50" Rear Projection...

1 Answer

Double images


Convergence amps bad call a tech make sure he does'nt use generic parts A Toshiba service center should know what to do around 300.00

Apr 12, 2009 | Toshiba 50H82 50" Rear Projection...

1 Answer

Convergence problem


This is out of the service manual

don't forget to write the setting to rom by hitting the pip button twice

Good luck and don't hesitate to ask questions






2.12.5 Convergence point adjustment
Adjustment preparation
(1) Select color to adjust.
“STATUS” - Green
“0” - Red
“ANT” - Blue
(2) Use 4, 6, 2, and 5 to move the cursor position
(dotted lines).
(3) Use thumb stick to move the convergence point.
(4) Three adjustment modes are available:
1. (3x3) Press “STATUS” 5 times (only works
when DCU is in uncorrected state)
2. (7x5) Press “0” 5 times
3. (13x9) Press “ANT” 5 times
For touch-up, only the (13x9) mode is necessary.
This will adjust every cross-hatch intersection point
on the screen.
For complete adjustment, start with (3x3) mode. This
will adjust center point and eight edge points only,
but will greatly reduce adjustment time. Then use
(7x5) mode, and finally (13x9) mode to finish
convergence.
If “S” distortion appears between cross-hatch lines
repeat (7x5) mode to change calculation process
while adjusting to remove distortion, then return to
(13x9) mode to finish touch-up convergence.
Adjustment procedure
(1) Receive any NTSC signal.
(2) Start adjustment at the center of the screen.
(3) Continue adjustment at next closest position.
(4) Adjust center area first, ending with edge sections.
(5) Press INFO button to perform calculation operation.
This process will take about 2 seconds and no
picture will be seen at this time.
(6) After interpolation, check convergence again and
repeat (1)-(5) if necessary.
(7) When convergence is acceptable, press PIP MODE
to write data to ROM memory. ROM WRITE? is
displayed to alarm system that ROM will be
overwritten with new data. Press the PIP MODE
button again to write displayed data to ROM.
(8) DATA WRITE TO ROM will take approximately 4
seconds and no picture will be displayed.
(9) Green dots will be displayed when operation is
completed.
(10) Press MUTE to return to convergence pattern, then
confirm again convergence is acceptable.
(11) Press PIP MODE (ROM WRITE) mode, then press
PIP CH to initialize sensor data positions.
Adjustment procedure
(12) Input any 1080I signal.
(13)Press EXIT key 5 times to exit video mode.
(14) Select an input with 1080i signal.
(15)Access menu and select ASPECT 5 mode.
(16)Press the SERVICE SW. ONLY button to enter to
DCU crosshatch signal.
(17)Repeat steps 2~11 above.
Notes: (1) Display only green for easier adjustment and
match to jig screen. Press “MENU”, THEN
PRESS “STATUS”.
(2) Perform interpolation and data write to ROM
after green adjustment. Once green has been
confirmed to match jig screen, the jig screen can
be removed. Do not readjust the green color
after jig screen has been removed. This is now
your reference color.
(3) Display green and red only and match red to
green.
(4) Display all colors and match blue to green and
red. Touch-up red color if necessary.
(5) Existing DATA in ROM can be read by pressing
the SWAP button 2 times. This data can be used
after replacing a component (CRT, DY, etc.)
Where complete convergence adjustment is not
necessary, be careful not to overwrite this data.
DO NOT write cleared RAM data into ROM or a
complete convergence adjustment will be
necessary. Remember to try MAGIC FOCUS
before starting convergence adjustment to
minimize adjustment time.

Feb 01, 2009 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Convergence for toshiba 50h82


Either mode is fine...just save your session when done!

Projection sets have two very common problems.

The first common problem is convergence

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,Akai,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...

*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 http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Nov 16, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Toshiba 50H82 Wavy Lines - Jittery Picture.


Dont have the manual - sorry - but this is the most likely cause.

Projection TV sets have two very common problems listed below.

Problem #1) Convergence


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,Akai,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...

*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 http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Nov 11, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Convergence problem


my convergence are having a problem the blue color won't moved

Oct 03, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Toshiba 50H82 blue arcing?


color shadows on numbers or letters indicate a possible convergence problem.. might be a crt deflection problem.

Dec 18, 2007 | Toshiba 50H82 50" Rear Projection...

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