Question about Toshiba 43H70 43" Rear Projection Television

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Yellow arch on bottom left of screen

I have a Toshiba Projection TV Model# TP50H50 that has a yellow arch on lower left corner. I tried to align the colors and all will align but the bottom left cross hairs - these move and try to align but don't go far enough. The TV works great other than that.

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The most likely cause is shorted convergence chips and possibly a few pico fuses.

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,PioneerYellow arch on bottom left of screen - 2_bing.gif Hitachi,Mitsubishi,Zenith and others.
You can get a convergenece repair kit with instructions from the links 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

You can see some more examples and find a fix herebb0cf99.png http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Posted on Apr 18, 2010

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OK, HERE are the instructions:
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With the set on press MUTE on the remote.

Then press and HOLD mute for several seconds and while still holding it on the remote press Menu on the front of the set.

A (S) should appear in the upper right corner of the screen. (It means you are in the Service mode)

Press menu again on the front of the set

7 on the remote will call up the convergence grid

3 on the remote will change the color to adjust from red to green to blue(do not adjust GREEN)


You navigate the grid with 2, 4, 6, and 8 buttons.

To stop the cursor from blinking so you can adjust at any point use the 5 button—to move again use the 5 button.


When you finish you exit by hitting 7 on the remote again.


Sometimes you have to try a few times to get into the menu—I have had my problems but once in it is easy.


if adjusting does not cure the problem one of the convergence chips this set uses and or a resistor are bad.

Let me know what happens and if you need more help let me know
SD TECH



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Try this link, leave them an email but you will need to measure your screen size top to bottom and side to side just the visible screen area then leave them a email at the site they will get back to you soon.
http://servicemanuals.vstore.ca/

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Hi There!

I am not familiar with this model,however if there are no screws or clips on the inside or side panels, the front would be the place to start. usually right at the bottom front are screws to remove the bottom front panel first. Then the rest will be exposed. Work your way from the bottom up. The screen itself will be last and normally hooks over the top frame. Good Luck, JUS004

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Now Degaussing and convergence are two different things, if you say its degaussing then you should have just a color differential in a certain area, meaning the color should not be arched, everything that passes through should pass throu only with the changing of color. Now if its a convergence the the color may lift upward in an arch, likely separated from the other colors, Red, Blue,or Green. So now which do you think you have? Deguassing usually give you a highish green color or yellow

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