Question about Toshiba 50H72 50" Rear Projection Television

2 Answers

Accessing convergence in menu

I noticed on the left side of screen you can see double letters when writing is on that side of screen. Tried going to the menu and then convergence and it shows to access that function to press left or right arrow,I do that and nothing happens, I have left the tv on for about 45min prior to trying to converge it. Need to know if it is the ic or resistors and one more thing where is a good place to get a service manual for this tv, toshiba 50h72. Thanks in advance.

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  • ellite Feb 03, 2008

    Thank for you help, but i have not tried to repair it yet just got the tv from a friend who did not need it no more and was playing games on it and noticed the writing on the left side looked doubled, so I started looking on the net to find a problem and I think it has to do with the convergence but not sure. So I tried to do a convergence through the menu and when i goto convergence in the menu and try to activate with the left or right arrows nothing happens, need to know how to access it or is there another way to reset convergence, also no remote with tv. Thanks

  • ellite Feb 03, 2008

    so you are saying that the tv is in some type of protection the reason it will not go into the convergence menu?

  • ellite Feb 03, 2008

    so all of these possibilities would not allow me to access the convergence in the main menu? Ill try to get a pic of it! Thanks again for all of you guys help.

  • sacrane Feb 16, 2008

    I just had my Hyper board repaired on my Toshiba 50H72, now the convergence seems to have gone out (I get double picture based on colors....esp green). How do I fix or is there someone in the Naperville area that can fix?

  • Greg H Mar 01, 2008

    Toshiba 50H72 Flickering - Initial start up is unwatchable - I sent a AVI to a local repair shop and they said its a hyperboard - can anyone confirm this?



    Greg

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2 Answers

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  • Master
  • 934 Answers

Ellite,
That is a TA0262 chassis and from what you're describing it could be a one of two things. A picture would speak volumes if you can send one...
If it's convergence you should be able to replace the amps, check and/or replace a couple of pico fuses and resistors and you're good to go. But from what you're explaining and what djnick was understanding the problem to be it sounds a bit like what techs call piecrusting - affecing only the outer edge(s) of the picture. If so, it's likely the hyper module Toshiba p/n# 23148024 and more specifically the grouping of caps on that module that have failed. More specifically 11 caps all 10mf/16v at the following pos#'s:
Cx261
Cx230
Cx270
Cz52
Cx178
Cx221
C514
Cx250
Cx670
Cx241
Cx541

They're an smd cap and most of us simply replace them with miniatures and just clip the leads to fit.. Or you could just pull the board and send it ti a reputable shop and have it done, not an expensive job...
Either way if you have a pic it would be most helpful...
Bill

Posted on Feb 03, 2008

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Protection mode means there is excessive current being drawn from some section of the tv. Power supply and deflection amps and convergence system are the biggest culprits but there are other causes, as well.

The foldover indication is a clear sign of a vertical deflection problem. The burn marks may mean there is a power supply meltdown caused by excessive current drawn. There could also be a horizontal meltdown going on. Temporarily lift the B+ line feeding the HOT/HV section and see if that prevents it from going into protection.

Check your soldering and other connections to make sure you did not execute a short when doing the work. If it did not go into protection before the vertical IC was changed it should not after - unless something was introduced that caused the excessive current.

Here are some general ideas that may help:
http://www.repairfaq.org/sam/tvfaq.htm

Posted on Feb 03, 2008

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1 Answer

Where is the auto convergence button


Hello
From it menu option, suf through and come to automatic convergence display option and press Ok button on the remote control.

The List & Labels part of the setup lets you edit your channel list and choose or create a

personal six-character label for each channel.

Note: Changing List and Labels can be time consuming. You can change these at a later time by accessing the

Setup menu.

1. Press the left or right arrow to scroll through the available channels and choose the

channel you want to edit.

2. Press the down arrow to highlight the In channel list option. Press the left or right arrow

button to add (the box is checked) or remove (the box is unchecked) the channel from the

list.

3. Press the down arrow to highlight the Channel label option. Press the left or right arrow

button to scroll through the available list of 25 most common labels. The last option in

the list allows you to create your own six-character label for the channel (the first letter of

the label is highlighted).

4. Press the 1 or 2 number button to change the first letter of the label.

5. Press the right arrow to highlight the second letter, then press the 1 or 2 number button

to change the second letter, etc...

6. When you are finished creating your label, press OK. For model D34W20, your TV tunes to

the last channel available in your channel list. For models D40W20 and D52W20 only, the
Auto Convergence menu appears next.

Auto Convergence (for models D40W20 and D52W20 only)

Your TV's picture tubes might have been disturbed during delivery or after you moved the TV,

causing the color in your TV to be out of alignment. The colors adjust by starting auto

convergence.

1. Press OK to begin auto convergence.

2. When the auto convergence is complete, the Red center convergence menu appears. The

cross in the middle of the screen should be yellow. If it is not, use the arrow buttons to

move the red cross to overlap the green cross. Press OK when adjustments are complete.

3. The Blue center convergence menu appears with a cyan cross in the middle of the screen. If

it is not, use the arrow buttons to move the blue cross to overlap the green cross. Press OK
(the TV tunes to the last available channel in the channel list).
Ok

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The left side of the picture is distorted with a double image. The right side is fine. As things such as the stock symbols on CNBC scroll across from right to left on the screen, they start out looking...


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It's a convergence issue. Go into the main TV menu under video settings and look for convergence. If it has an auto convergence select that and wait a minute the TV will adjust itself and give you a clear picture.
If the TV does not have an auto convergence and just regular convergence than select this. It will give you a grid pattern on your TV and you have to move the cursor (using TV remote) and adjust each "point" so that each line is perfectly white. If you notice red or blue anywhere on that "line" then you have to adjust using the up, down, left and right arrow keys to "line up the red and blue lines with the nearest white line. It takes time and patience to do, but when completed, all lines on the grid pattern should be pure white and you will have a great looking picture.
You have to do this will all TV inputs (Video1, Video2 and so on) the reason Zoom looks good, is because you never used that screen as much and so the lenses didn't have a chance to get out of synch.
RPTV's are made of the three lenses (red, Blue and Green) and as you watch TV, these lenses slowly get out of alignment. So you should do a convergence about twice a year to make sure nothing is out of whack.

You can pay somebody to do it, but may cost you like 100.00 or do it yourself, it is very easy just tedious and time consuming. If you have the auto convergence than your golden because this is the easiest way to "reset" the TV.

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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
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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
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Shadow


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If this needs to be done manually, it is a chore. Contact me for directions how to do this. It is best left to a pro but this can get costly and wouldn't hurt if you tried yourself as if someone comes in, the cost would be the same whether it is out slightly or severely.

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I am having a shadow/double image problem only on the left side of the screen


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Red convergence is out of alignment


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