Question about Panasonic PT-47WX49 47" Rear Projection Television

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What is a convergence amplifier - Panasonic PT-47WX49 47" Rear Projection Television

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The convergence amplifier is a three channel Integrated circuit which controls the convergence alignment of the three picture tubes in a rear projection TV. Your convergence amps are STK392-110 there are two of them also check the six 2.2 ohm 2watt resistors

Posted on Aug 08, 2010

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Convergance chip


devices: Any Projection TV with a Convergence Amp board

If I knew which Mitsubishi Projection TV you're looking at, I could help quite a bit more. In general, the "convergence chips" on a typical Convergence Amplifier board are actually two STK's mounted to large heat sinks. "STK" is electrical engineering slang for "Convergence Amplifier Integrated Circuit".

Here's a helpful Solution archived at FixYa:
http://www.fixya.com/support/t4337218-image_bowed_line

You'll see in the photo that the STK on the PC board actually have part numbers on them that begin with "STK".

Dec 09, 2011 | Mitsubishi Televison & Video

1 Answer

Color is off with double image?


Is the image bow-tie shaped, with red, green or blue fringing effects? If so, one of your convergence amplifiers has gone bad. (Bow-tie: at least one of the three primary colors in the picture goes out to the corners, but the top, bottom and sides are bowed in at the center.)

If it is simple color fringing, with no color grossly misplaced, something has messed up the convergence. This may be caused by a strong magnet near the set (for example, a poorly shielded audio speaker), moving the set so its orientation in the geomagnetic field is altered or its components mechanically shifted (rough handling).

If a convergence amplifier is bad, replace it before doing anything else. If you just have minor fringing, see your owner's manual for instructions on using the remote control to adjust convergence. If it isn't in the owner's manual, you'll need the service manual. Caution: if you try to adjust convergence with a failed convergence amplifier, not only will it not help, but you will have a lot of extra work trying to get it back to normal after you replace the amplifier. Try a small adjustment along one edge of the picture. If one or more of the selected color dots in the convergence pattern won't move, and you are sure you are following adjustment directions, stop immediately and proceed with hardware repair.

Convergence amplifiers are usually marked STK392-nnn where nnn is a specific variant number. Two are used; I usually change both because quite a few people have changed one and had the other die not long afterwards. Sometimes there is a fuse in the power feed to these modules that is also blown. If you change the fuse without replacing the amplifiers, you'll probably waste a new fuse.

Oct 06, 2010 | Panasonic PT-53WX53 53" Rear Projection...

1 Answer

Rcs hdtv multiple images


The problem you're having is due to the failure of the convergence amplifier circuit. In that circuit are some components which amplify or control the signals to the dynamic convergence yokes, which line up the red green and blue images to superimpose them over each other to create a proper colour picture. When you get a failure in that circuit, it no longer aligns the images properly, and generally you get what appears to be badly set geometry in multiple colours. In some cases you will also get a problem with the part of the power supply that supplies the convergence amplifiers, or the digicon, which is the digital convergence control module.

Jun 12, 2009 | Hitachi 43FDX01B TV

1 Answer

Hitachi 53UWX10BA HDTV with convergence problem for blue


No there are no quick fix options for this fault. The convergence amplifiers operate similar to a high power audio amplifier, so if there is an impairment anywhere in the system, it will result in distorted audio, or in the case of television convergence amplifiers, a color won't align. The convergence power pacs need to be replaced and the out of tolerance precision resistors located near the power pacs need to be carefully checked and replaced as necessary.

It is also possible that there are root faults that cause the amplifiers to go bad which include bad connections or a bad digital control module. This repair is possible for anyone having basic electronics knowledge and soldering skills.

Apr 28, 2009 | Hitachi 53UDX10B 53" Rear Projection...

2 Answers

Need of a Convergence Board for an RCA PROSCAN Model 80690WW1


You can order a replacement Convergence Board or Convergence Amplifier Board for this model (PS8069) from a major RCA parts distributor at the link below:

RCA PS80690 Replacement Part Convergence Board

RCA PS80690 Replacement Part Convergence Amplifier Board (2F27039-502)


Please note, these boards are no longer available from the original manufacturer (RCA) and only appear to be available from PTS.

Apr 08, 2009 | RCA Televison & Video

1 Answer

Convergence


Hello,
This is a sign that the amplifiers are on the verge of going out since it is able to exert partial control over the CRTs. I would suggest that you try manual convergence, follow the direction in the schematic diagram on how to do this. If this does not work then I would suggest either changing out the convergence amplifiers and all of  their biasing resistors, or having a qualified TV repair shop do the job for you.
I hope this helps,
Thank you,
Shuttle83

Jul 08, 2008 | RCA HD52W59 HDTV Projection Television

1 Answer

Convergence problem.


This denotes that the convergence amps are going bad or the biasing resistors are failing. Check the bias voltages on the amplifiers to determine if this is indeed the problem. If it is try to replace the biasing resistors first, then if this does not clear up the problem, replace the convergence amplifiers. Also check the convergence coils for problems.

I hope this helps,
Thank you,
Shuttle83

Jan 22, 2008 | Mitsubishi VS-60805 60" Rear Projection...

1 Answer

50 " mitsubishi projection tv


This website:

http://www.techlore.com/forum/thread/18547/Mitsubishi-convergence-IC-s-used-in-the-differant-models/

says your model uses the STK393-110 convergence chip. Another site I looked at said that was a 6 channel amplifier so I'm guessing you only need one to repair your TV.

If you do some google searches on "stk392-110 convergence problem" you'll find some good sites that discuss how to repair the tv. The STK392-110 is a convergence amplifier that is used any many other sets.

Good luck.

Nov 19, 2007 | Mitsubishi VS-45609 TV

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