Question about Hitachi 50SBX78B 50" Rear Projection Television

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Hitachi 50SBX78B Horizontal lines and bow

Hi This has a line clear picture on the top 80% of the screen But the bottom has slight red shadow (convergence?) also has a hourglass effect starting ,,now the Lines,,they go across the whole screen about 1/4 way down many lines about 4-5 inch wide distorts picture right there . the rest is a perfect picture ,, this set has this digital Convergence Magic button , does this system clear up Bad STK IC's this well while causing the lines ?

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  • johnmk13 Feb 08, 2009

    I made a slight adjustment to Horizontal lines are gone hit the service button grid appers I see the red looks good ,, green and Blue are way off in top left and bottom left ,, so Looks like Convergence IC's must be the ticket ,, any one know which ones are used in this set ? looks very time consuming to get at them in this set ,, Huge board , heat sink clamped totally around them no #'s visable

  • johnmk13 Feb 12, 2009

    OK I Put the IC's in ,, Resistors didn't show any signs of heat, burn ,, the blue is still messed up,, looks like it's over sized flashing and blurry ,, while in magic focus the text is stretched off the screen ,, only the blue ,, as I wait for it to discharge before I go back and remove the board again for a better look at my work, is there something in general I might have over looked ?




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John, Hitachi site is down at the moment, if you remove the clips on the front of the IC`s you will see the numbers of the convergence ic`s, and yes they are a pain to get out, they are probably stk 392-110`s if they are the originals, you`ll have to un-solder 36 pins total to get them out, check for burnt resistors in the general area of the ic`s and replace any that are burnt before turning the set on,be sure to order a tube of "heat sink compound" to apply to the back of the new IC`s, once on the set will probably still look poor, this is normal, run the set for minimum of 15 minutes then push the " magic focus button " inside the front door panel, after it has finished running magic focus it should look great, video-tek

Posted on Feb 09, 2009

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Your set may have one or more of the following symptoms....

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The first common problem is convergence

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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
*Colors wont align
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*No Audio/Video - TV Shuts down - May also make a constant chirping sound

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http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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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=

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