Question about Hitachi 53UDX10B 53" Rear Projection Television

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Convergence problem My TV has convergence problem, When the problem showed up at first time, I replace the ICs STK and all related risitors My TV has convergence problem, When the problem showed up at first time, I replace the ICs STK (two) and all related resistors following the service manual. It was working TV back to normal. But after a few months, the convergence problem showed up again, I find out that same resistors burned, I assume that STK went to bed. So I did fix as late time. Again, after a few months, the problem came back. At this time, replacing IC and resistors do not take care of the problem anymore! After replace all the parts, I can use remote control to move those lines but only limited affect on the curve. Question, If replace STKs do not take care of the problem, what should I replace? And where should I looking into the problem. I am computer engineer with very good solder skills. Thanks

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  • ping Lee Jun 01, 2007

    Hi, Bill:
    Thanks for the help.

    I did replace STK392-150 and it does not fix the problem. Only thing I find out is, If I put 1w resistors, it will be burned out soon. So I put 1.5w resistors that hold much longer.

    What is the phenomenon that shows the digital convergence unit may be bed? I also read some article about if the electromagnetic deflection coil went to bed, it can also cause the problem of convergence.


  • ping Lee Jun 03, 2007

    Hi, Bill:
    Thanks, I order my parts from The STK392-110 cost about $6 and $10 for STK392-150. I will get the part from B&D, it cost $15.
    I will give a try and let you know the result.


  • ping Lee Jun 08, 2007

    Hi, Bill:
    I am in bed luck! The problem is getting worse.
    I replace ICs ( STK392-150) and also double check all the resisters as you said. After I make sure there is no error, I turn on the power. I see the problem of convergence still there! I knew that right way because if the problem is solved, all the lines on the screen should all go straight.That happened to me before. What getting worse is that the TV is off (no high voltage) by its self after a few minutes I turn on. The power is still on, but you can hear the relay click sounds. It looks like that the power blocks shut down by detecting something is wrong.
    Where should I look into?

  • Danomak Dec 23, 2007

    My 53' Hitachi rear projection tv had a severe convergence problem. I purchased the convergence repair kit mentioned in solution 1. The kit came with a diagram of the board showing each piece that need to be replaced. I have not worked with a solding iron for some time, so desoldering and soldering was slow and a bit nerve racking. I put the board back in and worked with the magic focus for a while. The picture looks good but could not get the right side blue to line up exactly. Also picture is a bit grainy or foggy looking. Is there anything I should adjust?

    Thanks for your help.

  • Bob May 11, 2010

    Have 53UWX10B from 2002. Had convergence kit installed 16 months ago. Now it will go in and out of color alignment and picture is curved @ top and bottom toward center of screen. Problem is only intermittent at this point.Picture is fine and then sometimes it starts acting up. I suspect the possibility of a loose connection since when prob starts if you tap side of cabinet usually will go back to normal. Service centers say they just want to come and replace convergence kit for $500.00 or so. Don't think this TV is worth that kind of investment, especially if repair will only last a year or so. Any suggestions???



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That unit has a convergence repair kit that should fix most problems. Order it directly from Hitachi p/n# X480295. It contains: Rk42 3.3 Ohm 1w Rk46 1.8 Ohm 1w Rk50 3.3 Ohm 1w Rk54 1.8 Ohm 1w Rk58 3.9 Ohm 1w Rk62 2.2 Ohm 1w Ik04 Stk392-150 Ik05 Stk392-150 And I would strongly recommend testing all the resistors in that circuit for change in value. Are you using a good heat sink compound on the STK's when you installed them? That and ordering the japanese knock-offs for STK's are the two most common critical mistakes made. Originally that unit had two STK392-110's for conv. amps. Even Hitachi recommends subbing to a STK392-150 or 180 for greater reliability. You do realize that for the cost you have after two failed attempts you probably could have taken this to a reputable shop and watching the ball games now. :) (no disrespect intended) Good Luck! Bill

Posted on Jun 01, 2007

  • William Rayburn
    William Rayburn Jun 03, 2007

    When the STK's short they will usually take-out their corresponding resistors. Don't know where you purchased your amps from but one of the most critical problems in our industry today is knock-offs being sold as genuine parts. The STK is made by Sanyo - try B&D Electronics BDENT.COM on the net..
    Make really sure you have checked all the resistors in the convergence circuit for a change in value. Set your DMM for ohms read and replace any resistor not within 85% of its rated value.
    Good Luck


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Posted on Feb 12, 2009 convergence problem - 0%20stars_w.png
19a7683.gif Ecollier2012
Rank: Guru
Rating: 91%, 106 votes
Your TV most likely has one of two 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 boweconvergence problem - 701cb04.jpg.

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 problem - 2c07611.png chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site 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, etcconvergence problem - 578ba6c.jpgven see halos around images.

Picture of a set that needs the fluid chanconvergence problem - 65af323.jpgbr />578convergence problem - 2c07611.pnglass=
TV set after fluid change


2c07611.pngSolution #2

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

Posted on Mar 09, 2009

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My Magic Focus Does not work on my hatachi tv and my colors r not lined up does any body know how to line up the colors on the tv.

Posted on Jan 27, 2008

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My Hitachi 43 UWX10B had severe convergence problem making it unwatchable. repaired by technician for $285 made this 5 yr old set work like new!
I lack equipment, tools and skills to diagnose and repair these rear proj HD monitor I bit the bullet. hope it will last some 5 yrs or so.

Posted on Nov 24, 2007

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