Question about Toshiba 50HX81 50" Rear Projection Television

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CONVERGENCE? I have the dreaded convergence problem. I noticed that the blue line is curved at the bottom and seems to be lower on the left side of the screen. When trying to use the manual adjustment I have noticed that the Red can be moved up,down, left and right. When trying to adjust the blue I can make it move left and right but will not move up and down. I just replaced both of the STK392-110 IC's last night. The condition is exactly the same as before. I did not seen any burnt resistors,cracks or other hot spots. This TV is 6yrs old and has been working great until this. Could there be a problem with the CRT? Is there a good way of checking them to confirm? Any and all help is very much appreciated

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You can not tell anything about those resistors by sight get an ohm meter and test them. Disconnect the three plugs going up to the Yokes first though or you will not get an accurate reading. Check the resistors around the blue yoke plug closely this is where you will find your problem.

Posted on May 17, 2007

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The blue lines on the left lower side of the tv will not converge. The tv has never given me a problem. I woke up one morning and powered it on and noticed the blue is misaligned. I tried converging and...

This problems can happen to the DLP tv any times of it tv life.Tv is 100% have a convergence problems.The 2 STK convergence ICS and some or all it resistors are dead.These parts on the tv convergence board,must be replaced to solved the tv picture convergence problems.The shop,will cost u like $300-350 for parts and labors.

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Projection HDTV Pansonic 47" Curving blue and green colors on top and bottom of screen.

You will need to replace your two convergence I.C.s.They are two large IC mounted on a large aluminum heat sink.Replace both,look for any burned resistors near them,replace those if needed,and readjust your convergence. Good Luck

Let me know if you need any further help

Mar 29, 2008 | Panasonic PT-47WX42 47" Rear Projection...

1 Answer

Convergence issue... I tried to manually fix it through the menu option without any luck. The convergence does curve at the top and bottom of the screen.

It seems the solder is broken in Vertical Convergence Amplifiers or it is damage internally. This model has 2 Conv. Amps: 1 for Horizontal (Red, Green and Blue) and 1 for Vertical Convergence output (Red, Green and Blue), if the convergence does curve at the top and bottom, it is because Vertical Converegence output is no good. The Conv. Amp. costs around 20 dlls. Thats why you can not fix it with the Menu option. Good luck!

Nov 13, 2009 | Philips 60PP9202 60" Rear Projection...

1 Answer

Screen has curves

Bad convergence IC's and possibly yoke return resistors located right by the convergence IC's

May 08, 2009 | Projection Televisions

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Convergence issue

try fixing the convergence 2 after your've aligned the convergence 1 - the second (accessed via the set up control) let's you adjust on 9 different axis to align the red and blue tubes to the green. you select which + sign you want to adust by pressing the corresponding number for the + ie 1 for the top left, and 9 for the lower right corner.

good luck (note - you cant change the green only the red and blue, if the whole edge is a mess try moving the image (you need to be in zoom mode, and then access the position adjustment via the pitcure set up screen.

Nov 05, 2008 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

Hitachi 46f500 convergence?

a common problem wich i also have with convergence with blue and red convergence.
the image converge amplifiers are burnet out wich in turn blow out resisters that control individual color convergence.

Jun 19, 2008 | Hitachi 46F500 46" Rear Projection...

1 Answer

Blue Convergence Problem

This is a pain and you have to be carful in doing this fix. Its basically the bulb thats shot, its got that liquid in it so DO NOT BUST IT OR YOU WILL SCREW THE BOARD UP! THen you have to get a new TV

Oct 26, 2007 | Philips 46PP9302 46" Rear Projection...

1 Answer


Replace both convergence IC's part# STK392-040. Also check for burnt/discolored resistors nearby.

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