Question about Toshiba 57H81 57" Rear Projection Television

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57H81Toshiba Blue Line not straight

This morning the color on the TV was showing lots of blue. After attempting several times to press the touch focus button, the same results appeared.

The horizontal blue line (the last check) did not produce a straight line, it was curved on the top and bottom line. Then an error message appeared,
"Touch Focus Error."

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You have a bad convergence output IC in the blue vertical circuit. On the bottom side of the chassis you will see a " V " printed by the heat sink. You will need to unsolder the heat sink and the 20 pins on the IC to remove it. Replace with STK 392-180 (sanyo) if possible or STK 392-150. Looking from the rear the heat sinks are big aluminum finned rectangles. There are 2 heat sinks one marked H and one Marked V. Even though you have a horizontal line your problem is in the vertical IC. Be sure to use a liberal dose of heat sink compound.

Posted on Aug 03, 2008

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I turn on my sony TV and it goes straight to blues screen. model number is kp-51hw40


These sets have a history of bad picture tubes, the blue is most common, there is a way to without replacement of any parts to attempt to correct this.

you have to remove the entire grill on the front below the screen; it is usually held in either by two screws at the front (under little plastic caps) and or screws on the back on either side.

The grill will pull out and is engaged with large plastic tabs at the top; with it out since the front keyboard is mounted into it you lift and tilt it to the left. Remove the inspection plate behind it: look for the screen/focus block (see attached photo) and note the six controls: three are screen and three are focus----do not touch the focus ones.

They are usually marked (may be hard to see: r,g,blue) You want to locate the BLUE SCREEN CONTROL and with the set on on a unused video input turn the screen control SLOWLY (usually to the left) until you see no blue in the background; if you do it correctly all you should see is the Video 1 etc.


The idea here is to lower the blue screen setting just slightly-if it works you may only be buying some time as these sets are prone to problems like this.

I have done this several times and many see a few more years of use before they have to be replaced.

Let me know before you attempt this if any questions.


SD TECH





sd_tech_29.jpg

Dec 30, 2010 | Sony KP-51HW40 51" Rear Projection...

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"touch focus error" appears when the test is completed. There is a double effect showing on the pictures and the words. What can be done to fix this?


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.

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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 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

Aug 14, 2010 | Toshiba 65HDX82 65" Rear Projection...

2 Answers

Toshiba 50hdx82 tv touch focus error blue is bowed.


Convergence is dead.Know how to solders.Must replaced the 2 Convergence ICS,and all it resitors.To do it ur self repair buy a convergence kit at Tv repair World.com,Repeairkits.com.The shop will cost u $300 for parts and labors.

Feb 04, 2010 | Toshiba 50HDX82 50" Rear Projection...

1 Answer

My Toshiba 42H83 has developed a color problem. The color blue is about an inch off the other colors, the picture looks like a 3d movie without the glasses. I have used the touch focus button on the...


Alot of rear projection t.v.'s have a convergence option in the menu on the t.v. There you can set the try to set the colors back how their supposed to. Mine has a cross in the middle of the screen and you just have to try to get all 3 colors to line up. Unfortunately, the actual lens inside mine has to be aligned so it doesnt work. Just something to try though, hope it helps.

Jan 05, 2010 | Toshiba 42H83 42" Rear Projection...

1 Answer

Hi, my tv shows a double image with red outline I pressed the Touch Focus and the red did not have a verticle was straight line, but the horizontal line was not straight, but came back with touch focus...


you have a convergence problem
it will require a couple new ics its best to replace as a pair stk392-110 although i recommed using the stk392-150 as a replacement and also there are some jumpers that should be resolderd on those boards to assure continued operation hope this helps you

Sep 11, 2009 | Toshiba 42H83 42" Rear Projection...

1 Answer

Vertical blue line not in vocus


It sounds like you lost a convergence amplifier. There is also the possibility that a resistor on the main circuit board that goes to the horizontal control circuit for the blue CRT/deflection yoke may have a cold solder joint. These circuits generate a considerable amount of heat and can weaken solder joints over time. Try bumping the side of the television and see if the blue line changes or if the blue color returns. If so, then it may very well be a cold solder joint that needs to be touched up. This is one of the first things that an electronic tech tests for - sounds crazy but I've fixed literally thousands of televisions this way. Good luck.

Jan 05, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

Double Picture


Convergence amp ic bad
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
http://www.hdtvoice.com/voice/showthread.php?t=28929
Or send to ptscorp.com
http://www.hdtvoice.com/voice/index.php?s

Jan 05, 2008 | Toshiba 42H83 42" Rear Projection...

1 Answer

Out of Focus


· Samsung parts for convergance problem
· http://www.partstore.com/Part/Samsung/Samsung/BP9500142E/New.aspx

Nov 24, 2007 | Samsung HCN4226W 42" Rear Projection...

1 Answer

TOUCH FOCUS ERROR


The convergence IC`s need to be replaced and the related low ohm resistors need to be checked for proper value.

Oct 15, 2007 | Toshiba 57H81 57" Rear Projection...

1 Answer

Blue ghost


If you have the ability to work on solid state electronics and know how these circuits work, you will need to replace the convergence IC's in this TV set. If you do not, call in a pro to assist you in this repair. Good Luck

Jun 20, 2007 | Toshiba 43H71 43" Rear Projection...

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