Question about Sony KP-43HT20 43" Rear Projection HDTV-Ready Television

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Sony KP-43HT20 convergence problem

My Sony KP-43HT20 projection TV was very good. I accidentally pushed Flash Focus button and it lose the convergence. I pushed Flash Focus button again many times. It could almost convergent the red and green colors, but couldn’t move the blue color as shown in the figures. The blue tube couldn’t project the parallel lines and the pictures are blurred, Could someone advise me how to fix the convergence problem? Thanks.

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Re: Sony KP-43HT20 convergence problem

Replace STK-392-110s or 150s upgrade with 180s replace both ics.

Posted on Jan 09, 2008

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Where is the magic focus button?

Most Sony Rear Projection TV have a small door under the screen with some manual controls. Push on spring loaded door to open. Magic Focus is near the bottom and labeled.

If Magic Focus does not restore for correct operation, check the Convergence Gallery to confirm if you have a convergence fault that needs repair. #8 is the Sony menu.

Feb 11, 2011 | Sony KP-57WS500 57" Rear Projection...

1 Answer

The picture on our Sony TV Model KP-43HT20 recently became distorted, concaving at top and bottom. If I use reset the Flash Focus, the picture will return to full screen side for awhile but the colors do...

The tv have a problems known as a convergence problems,it dead.Tv have colors lines R,G,B mis alignments,have colors shadows pictures or 3D pictures look alike?The tv convergene board have dead 2 STK convergence ICS and some or all of it resistors are dead too.These parts on the tv convergence board,must be replaced to solved the tv convergence picture problems.The shop,will cost u like $300-350 for parts and labors.

Jan 15, 2011 | Sony KP-43HT20 43" Rear Projection...

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Wavy lines green and orange hue.While watching a fooball game the status bar is wavy and in two separate lines-Green and Orange-Tried flash focus and convergence and powered unit off for several minutes...

Flash focus button push,didn't solved pictures convergence problems.The tv convergence board is dead.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 $300-350 for parts and labors.

Sep 18, 2010 | Sony KP-46WT510 46" Rear Projection HDTV

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How easy is sony kp-43ht20 converge ic chip replacement?

Easy is not a good description... due to the cabinet size of this model, there is not much room to work. You will need to disconnect a lot and unfasten a lot of wires so that you can pull the chassis out of the lower cabinet. Then you will need to remove the D board screws and the Convergence amplifier screws (the amp will be right in your face, you can;t miss them... 2 large heat sinks right in a row. After you do that, you will probably need to change 1 of the 2 fuse links on the G board (the board the power cord plugs into). These are the supply Vcc for the convergence amps. They are 5A fuse links located on the upper/mid, right side on the PCB. Use caution, you need to discharge the circuit before you place the fuse in or you may pop the new (or remaining old) fuse. it's best to use a 100 ohm resistor to bleed the circuit on the input side of the fuse. You can do this by touching a legs of the resistor to the fuses legs. To be sure, just do it on both sides of the fuses. (resistor touch to fuse 1, side 1... and also to fuse 2, side 1. Repeat on other side of fuses.) Bleed for at least 5 seconds. After that, change the fuse(s), put it back together, power it up... press the Flash Focus button on the front of the TV. It you need to do further convergence, you can find information all over the place... or post it here.

Mar 13, 2010 | Sony KP-43HT20 43" Rear Projection...

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Sony rear projection tv will no longer focus. tried flash focus & manual focus

Convergence issue. The sony type 1 convergence kit from should repair that issue. The kit contains the parts and CD with instructions.

Dec 31, 2009 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Kp-43ht20 sony projection convergence issue with RGB

There should be a setting in your menu to adjust the convergence. if you have no luck correcting it this way you will need to have a repair center look at it.

Oct 04, 2009 | Sony KP-43HT20 43" Rear Projection...

1 Answer

Flash Focus does not focus the TV colors are seperated

if that doesn't work it will need new convergence IC's put in as well as a resistor or two


Oct 29, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer

Blue and red color are off, picture is not clear

convergence amp ic bad
Sony Convergence

Jan 29, 2008 | Sony KP-43HT20 43" Rear Projection...

1 Answer

Sony KP-53S75 blue convergence problem...

Good Day, Martin Ping;

Picture won't merge? It sounds like your TV has had a failure in the CONVERGENCE CIRCUIT by replacing those IC's should correct your TV's problem.

Good Night and Luck, big IRISH.

Oct 25, 2007 | Sony KP-53S75 53" Rear Projection...

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