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Tvs I want to know where the convergence amplifiers go

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Standard rear projection set has extra coils on the red and blue tubes.

Posted on Nov 04, 2007


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Good morning, I am in the moving business and have a customer that wants me to move their large TV Mitsubishi medallion tv. She thinks is comes apart in two peices for easy moving and I need instructions...

If the model is a WS-65809 that sey doesnt come apart. Actually very few rear projection TVs can be seperated Some RCA TVs can be disassembled to several pieces. Also I would let customer know that because a CRT TV has three CRTs that are aligned to each other , Moving the TV will cause the convergence to be adjusted. Based on model it can be just pressing the auto convergence option with the remote, But older rear projection TVs (2003 and older) have been known to blow ICs after a move when trying to reset the convergence. The ICs weaken over age and they can blow anytime the convergence adjustment feature is used, so its always a good thing to let someone know that even if very careful when being moved there set may develop convergence issues after a move because its a 3 CRT rear projection TV

Sep 15, 2011 | Mitsubishi WS-65809 65" Rear Projection...

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I was looking at a RCA D52W20 52 in. Rear Projection HDTV-Ready Television but they said that the colors went out of you know what could cause that on this tv or what a possible fix could...

If one or more of the colors is displayed in a bow-tie rather than a full-screen rectangle, the STK392-nnn convergence amplifiers have probably gone bad (nnn is a three-digit type variant number). This is a common failure in CRT-type rear-projection TVs. There are two of these amplifier modules mounted on a metal plate or finned radiator. I recommend replacing both (one of the colors is shared between the two modules, or each color uses one amplifier from each module so both amplifiers could be damaged).

The STK392 has three power amplifiers inside. Each color needs two amplifiers for its convergence correction coils, so two modules are used. There are at least two different connection configurations among the different variants. Some variant numbers are merely higher-power versions of others, so they can be substituted (never sub a lower-power version for what is in your set - it will die rapidly and possibly with destructive fireworks). If you don't understand the datasheet for the part, don't try to substitute a different variant unless the dealer guarantees it is a suitable replacement.

The photos below show two typical package types close to actual size (the pin-to-pin spacing is 0.100 inches). It is best to get name-brand parts (e. g., Sanyo, Hitachi or Toshiba); some of the Chinese off-brand replacements don't last very long. When I had a string of these jobs several years ago, I paid about $23-$35 each, but I saw some overpriced as high as $75 and some off-brand or no-name units as low as $12.
(Photo from MCM Electronics)
(photo from

Often when the amplifier fails, some of the resistors connected to it are burned out. If all three colors are in the bow-tie shape, look for a small green fuse near the amplifiers and check whether is also needs replacing (don't change a blown fuse without also replacing the amplifiers or you'll waste a fuse).

It is essential to clean off the old heat-transfer grease from the heat sink surface and replace it. Apply a very thin, even layer of new heat-transfer grease to the metal plate on the back of the new amplifier so the entire surface is covered. Do not use too much; this will actually reduce the effectiveness of the thermal transfer. You want just enough to wet the contact between the module and its heat sink so any microscopic irregularities in the surfaces are filled in. Replacement should be performed by someone reasonably skilled at replacing soldered parts on a printed circuit board.

If nobody tried to adjust the convergence (see next paragraph) before the failed amplifiers were changed, very little if any adjustment should be needed unless there were burned-out resistors. If you still have a major misalignment, check the resistors around the module again to see if you missed a bad one.

STK392 failure is the most common electrical cause of mis-convergence. The most common mechanical cause is a shift in the optics due to a mechanical shock or twisting force on the TV. A stray magnetic field could also affect convergence. Minor convergence problems can be corrected by using the remote control to go into Service mode, selecting the Convergence function to bring up a pattern of dots on a square grid, and tweaking the offending colors back into place a little bit at a time all over the screen (there is some interaction; moving the convergence pattern dots in one place causes them to shift elsewhere). Be careful to keep the dots square in the grid or the picture proportions will be distorted, and be patient - it can take a while to get it right. Complete instructions are available in a downloadable service manual located at a number of places on the Internet (sorry, it's probably not free, but it's still a lot cheaper than calling in a tech who may have little more experience at RPTV convergence than you do).

Sep 10, 2011 | RCA D52W20 52" Rear Projection HDTV-Ready...

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I think i have a convergence problem with my tv

What is the model number? Can you describe the problem more completely?

A common problem with CRT-based rear-projection TVs is convergence amplifier failure. At least one of the colors will be projected as a bow-tie pattern (goes out to the corners, but not all the way to the top or bottom or sides). If this is your probelm, DO NOT try to adjust the convergence using the service routines. If you do, you will not only accomplish nothing, but you will make a lot of extra work for yourself or your technician after the amplifier is replaced. The convergence amplifier is probably a member of the STK392-xxx series. The xxx is a three -digit number for your particular version. Don't use a different number unless you know it is an upgrade substitute. Buy parts made by name-brand semiconductor manufacturers (e. g., Sanyo) - some of the no-name Chinese copies don't last very long.

On the other hand, if you just have a small amount of color fringing, perhaps because you moved the set, you can tweak the settings using your remote control. The procedure is given in the manual for the set. Be patient and use small adjustments, and keep an eye on the convergence grid pattern as you adjust to make sure it stays rectilinear as you move the color dots together. Adjustments on one part of the picture can change results elsewhere, so expect to spend some time to get the best compromise.

Feb 22, 2010 | Hitachi 51F500 51" Rear Projection...

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RCA Convergence problem TV model

Thats an easy repair. The flyback develops solder carcks which cause the FL231 fuse to blow and weakens DL231 so the set will lose the convergence options under the on screen menu. You can get the ITC222 and ITC222A convergence option missing repair kit from which contains the components and the CD with repair instructions. Its very inexspensive and includes shipping.

Jan 03, 2010 | RCA HD52W59 HDTV Projection Television

2 Answers

My philips tv won't turn on.

Very unlikely to be the switch. With the power supply shutting down, the problem is probably in one of the circuits that is supplied by it. Unless you know what you are doing, leave it to a technican.

Dec 30, 2008 | Philips Televison & Video

2 Answers

Bad convergance, blurry

you are having a convergence fail. would need to replace the STK convergence ICs. they are probably going to be STK392-040 and there are 2 of them. you would also need to check all the pico fuses around the area.

Feb 20, 2008 | Samsung PCL5415RB 54" Rear Projection...

3 Answers

Convergence chips

The convergence IC or in a sense ,amplifiers and the resistor are output resistors... if they are burning up the current going through them is spiking too high... TO me this is an indication that the "convegence yokes" are shorted. These are coils around the tubes that control convergence. I would suspect maybe that these are shorted to ground somehow. This is my first guess for this problem

Feb 11, 2008 | JVC AV-48WP30 48" Rear Projection...

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That is because the color guns aren't converged. A very common problem. 1st run the convergence utility in the on screen menu. If that doesn't help, the convergence amplifier modules are either coming unsoldered or actually failing. All shops that do projection TVs are well versed in this. $250 - $500. If you are good at soldering, I can go on with the details.
Hope Ya Fix It.

Jan 31, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

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