Question about Hitachi 57SWX20B 57" Rear Projection Television

2 Answers

Convergence of Picture

I am being offered a 53" Hitachi TV but the picture is not aligned in that it has several (3 I think) overlapping pictures. I believe the problem is something called a "convergence circuit". What am I looking at as far as repair cost/level of effort...I could do the repair myself if the parts were available possibly.

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  • Mark Egan May 11, 2010

    Most TV's like this have a built in convergence capability that you access from a menu of some sort.

    Do you know how to access a menu that displays dots on the screen?

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Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem

  • 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.
Convergence of Picture - 701cb04.jpg
77ea520.jpg
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.Convergence of Picture - 2c07611.png/>2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set thaConvergence of Picture - 578ba6c.jpg fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Posted on May 07, 2009

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Convergence problems are very common with projection type televisions.As a shop owner/operator I fix convergence problems on a daily baisis and depending on your electronics skill it is a pretty involved desoldering and soldering job.You could end up with a nice set that can last you a few years problem free for any where between $185.00 and $275.00.(If it is done right)You can try it yourself and spend about $75.00 in parts.Call around ant let the shop know that you need Stk392-120 and resistors installed into your set.Find out what it would cost to do just that and go from there.If you were to ask me that question the answer would be $225.00 parts and labor in shop, and $275.00 in home.Hope this information helps and please rate my information.

Posted on Jan 30, 2009

  • Albert Vasquez
    Albert Vasquez Jan 30, 2009

    If you cannot adjust in customer menu the service menu is not going to work either.No need to go there

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These sets have several common problems which are listed below.

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 - makes a chirping sound.
Problem #2

Another common problem is dull or washed out video.
Your TV 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 the fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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