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My toshiba 50h72 tv is having a problem with convergence. My husband moved the TV to a different location and when we turned it on a red line appeared around the pictures on the screen and the red will not converge when we do the basic convergence in TV Setup. TV repair in our area (Milledgeville, GA) wants $200 just to pick up TV and then extra for whatever repairs are done. Is this something I might do myself (no experience with meters or soldering but could I learn?)

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  • maxineblackw Dec 21, 2008

    Thank you so much for your very prompt response and your suggestions. I will do exactly as you suggest. Bless you and your family this Christmas season. Maxine

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I do not know repair rates in your area but I do this repair in the home for around $350 + service call rate. You can save money if you pull the board and take to a repair shop to have them replace the IC's. These are large STK392-110 (stamped on them) IC's mounted to large heat sinks. I use upgraded IC's STK392-560 as there are too may knock off 110's out there that don't last or in some cases - don't work at all.

Unplug the TV, remove the speaker grill and cover behind it. There will be a small 5" x 8" board near the front of the TV with large heat sinks. This is the board that needs to be removed. There will be several plugs that need to be unplugged from the board and one that runs back through the wireing harness that plugs in deeper in the set (remember where it came from for reinstallation).

BE VERY CAREFUL NOT TO MOVE ANYTHING ON THE PICTURE TUBES OR CAUSE DAMAGE TO THEM.

Posted on Dec 21, 2008

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1 Answer

Toshiba 50H72 have blue and yellow ghosts


Sounds like your convergence circuit went out. It lines up the red,green and blue picture tubes so the colors are lined up. Usually these TVs all use the same type of IC chips called "STKs" both usually get replaced along with any resistors etc.. around these chips that may have burned up. Depending on who fixes it could be around $300-400 parts and labor.

Rustym62

http://www.the-tv-dude.typepad.com

Apr 26, 2009 | Toshiba 50H72 50" Rear Projection...

1 Answer

TOSHIBA 50H72 50IN. REAR PROJECTION TV BLUE COVERGANCE PROBLEM


you have a convergence ampliphier ic failing that will need to be changed and then adjusted
average repair cost for this are 280.00 to 320.00

Jan 20, 2009 | Toshiba 50H72 50" Rear Projection...

1 Answer

The red seems to be out of place on my toshiba 50h72 projection t


Replace both convergence ICs they are stk392-110 you will also need at least the six 1.8 ohm 1watt resistors. You can get replacement ICs and resistors at the following link and they provide free installation instructions so you can do the repair yourself.
heres the link.
http://servicemanuals.vstore.ca/

Jan 18, 2009 | Toshiba 50H72 50" Rear Projection...

1 Answer

I have a toshiba model 50h72 double vishion


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 12, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Red & Blue lines on screen


stk392-110 i think mine was made in 2002 and i also had to replace mine

Oct 26, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Toshiba 50h72 picture and sounds takes 20 min to warm up


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 projeciton 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

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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 will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from TvRepairKits.com or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

Sep 09, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Picture gone.


You have bad conv. ic's.On these sets when the ic's go bad it will usually pop a fuse or burn up a few safety resistors,causing ith video to go away.

Mar 03, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Toshiba Rear Projection 42 "


http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Nov 23, 2007 | Toshiba 50H72 50" Rear Projection...

1 Answer

Red convergence will only move up or down


Stk392-110 red convergence IC is bad...normal procedure===

1) pull chassis   2) replace both Stk's for reliable repair

3)re-assemble  4) re-align convergence

 

If you hire a technician, 400.00 is ave. price.

Oct 16, 2007 | Toshiba 50H72 50" Rear Projection...

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