Question about Hitachi 53UDX10B 53" Rear Projection Television

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Red and Green colors do no line up

The red and green on the screen are not lined up with the other colors. They bow toward the center on the top and bottom. I had this problem 2 years ago and the repair technician (the tv was under extended warranty) replaced a part. Does anyone know which part I need to replace?

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  • chrisbet Dec 02, 2007

    I replaced both of the STK392-110's. Reconnected everything and when I pushed the power button the red LED blinks and there is no picture or sound. One other posting about this problem suggested changing C603 & S901. Do you think that will help?



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It was most likely the convergence amplifiers. If you look up "convergence amplifier" on this site or google you will find lots of information. The part number(s) will be something like STK392-110.

I recently helped a friend repair this problem. If you are comfortable soldering it won't be too bad.

Posted on Nov 28, 2007

  • ohiotom Dec 04, 2007

    The set we repaired did not have problems with any other components, but like you said, other people have seen additional components destroyed with the STK's fail.

    When we repaired the set here, I used a magnifying glass and looked at all the components in the area of the STK's carefully.

    I also found this advice regarding your set and the same problem on another website: "check the pico fuses in the primary supply leading from the main bridge rectifier over to the STRM regulator IC."

    Good luck.



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Re: Toshiba 65 in Cinema Series - 12 years old. Color Separation. Green bow at top center of screen, red and blue double images tilting upwards toward sides. Sometimes clears unassisted after set has...

projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.

Common Problem #1) Convergence has gone out

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.
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Here are some pics of convergence problems.



Common 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 that needs the fluid changed.

TV set after fluid change



You can see some more examples and find a fix using this link on Fixya

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Bowing of picture at top and bottom towards center.

Projection sets have two very common problems outlined below.

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. The TV can also shut down when the convergence starts to fail.

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, RCA and others.

You can more info and a DIY convergenece repair kit with instructions from TV Repair Kits using the link at the end of this article.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
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*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....

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