Question about Hitachi 51GWX20B 51" Rear Projection Television

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Red and Green have separated in double image and there is a dip at the top. Please Help.

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  • venugopal durairajan May 11, 2010

    is the television you own is a lcd version or a crt tube version?

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You have a defective CONVERGENCE IC. Most TV use 2 identical STK IC & both has to be replaced at the same time. If you are not a technician I don't recommend doing it yourself. There is a lot of desoldering to remove the chips with 16 or more pins- and soldering the new ones.
Good luck! Astrotech

Posted on May 28, 2009

  • Frank Largo May 28, 2009

    You have a defective CONVERGENCE IC. Most TV use 2 identical STK IC & both has to be replaced at the same time. If you are not a technician I don't recommend doing it yourself. There is a lot of desoldering to remove the chips with 16 or more pins- and soldering the new ones.

    Good luck! Astrotech

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Yes everything is repairable.....
The problem is in the Croma section of the TV
some times it ma happen due to 99% of moisture.........
Try Hot air Blow drying for 1 HR in side the TV i.e on the circute and blow clean if any dust partical are there
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1 Answer

I am getting a double image on my 48 inch television how can i get rid of it? it is showing colors green and red on double image


Assuming that your TV is a rear-projection TV, then it sounds like the separate red, green & blue tubes aren't set correctly.

Each tube needs to be alligned exactly to produce the image on the screen. If any of the 3 are mis-alligned then the effect you describe is caused.

Somewhere in the menu settings, will be an option to set the Convergence. This option will allow you to set the allignment of all three tubes.

Older sets do not have this option, and need to be adjusted via controls on the main PCB.

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1 Answer

Red and green have separated. is this fixable?


yes this can be fixed
it is the convergence IC's that controls each color image alignment ,also other components(resistors , diodes , capacitors , ect..) in circuit with these convergence IC's(STK's) also need testing to see what other component has also failed or needs replacing.

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2 Answers

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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.
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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.


2c07611.pngSolution


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 email and they will put one together for you. Their kits includes photo instruction guides, original Sanyo STK chips, convergence resistors, pico fuses, etc.

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1 Answer

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Problem seems in convergence out section.

TV needs Convergence Out ICs replacement.

If you have TV repair experience and know good soldering work then you can give it try OR get help of qualified TV tech to fix it.

If you need further help, let me know.

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1 Answer

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