Question about Toshiba TP61H95 61" Rear Projection Television

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I have a TP61H95. ive already replaced the convergence amplifiers. (three times)so i'm sure it not that. one of the amplifiers is getting extremely hot. ithought it was one of the convergence yokesbbut that wasn't it either.i'm thinking the digital convergence module is the culpert. i can take it completely out of circuit and run the unit, the amplifier that was getting hot is no longer. the works fine but not convergence. what could be wrong inside the digital convergence module or what am i doing wrong. 16year tech. just a little puzzling. can anyone help.

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  • Sonny Berry
    Sonny Berry May 11, 2010

    Did you check the low ohm resistors in the convergence out put circuits?

  • hatman1 May 11, 2010

    Well, the first thing I would ask is the convergence good even though the one amp is getting too hot? These amps usually run too hot because they are compensating for glitches in biasing. There are low resistance biasing resistors in the convergence yoke return circuits that can change in value when the original amps fail. If these resistors have changed in value then pretty drastic correction to the convergence alignments to compensate could result in an over heating amp.

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  • Toshiba Master
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Check all the hidden fuses in this set...if not - DCU - seen this a few times also

Posted on Apr 18, 2010

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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 alignment...do 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.
kato_tech_20.jpg
(Photo from MCM Electronics)
kato_tech_19.jpg
(photo from electronic-spare-parts.com)

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...

1 Answer

Color is off and can't adjust the blue convergence on my 55 inch philips rear projection


If the blue component of the picture is bow-tie shaped, you probably have a fried convergence amplifier (CRT type sets only). They are inside two modules in the typical CRT type RPTV. Each one has three amplifiers inside, so you have two for each color. If the blue CRT shares an amplifier from each module, you will need to replace both. I recommend replacing both anyway because they are notorious for having a high failure rate and you won't have to guess which one has the blue amplifiers. Check the resistors connected to the middle pins of the amplifiers - sometimes they get burned out when the amplifier fails.

The part number on the convergence module is STK392-nnn, where nnn is a three digit number indicating the variant specifically used in your set. Some of the variants are rated for a higher current than others, and some have different pin arrangements. Make sure you get a name-brand such as Sanyo or Samsung; there are some unbranded Chinese copies out there with poor reliability. The typical price is $12-$25.

The modules are black plastic slabs about 3" wide by 1 3/4" high, with the bottom corners trimmed off at a 45 degree angle. A row of pins comes out of the bottom edge and go into the circuit board. They are mounted on some sort of metal plate or radiator to dissipate heat (heat sink). When you replace them, apply a very thin even coating of thermal transfer grease to the metal plate on the backside of the module, and clean off the old grease on the heat sink. You want only enough grease to ensure a "wet contact" between the parts; more than that will actually reduce heat transfer. While replacement is straightforward, it does require skill at reworking soldered connections on circuit boards.

The hardest part will be restoring convergence since you tried to adjust it. Be patient, and try to get the convergence points square to each other so the picture isn't distorted. Adjust each one a little bit at a time. There is some interaction between the adjustments, so what you do on one part of the picture affects other areas.

Mar 14, 2011 | Philips Televison & Video

2 Answers

Magnavox Rear Projection 51MP392H/17 has ghosting issue ..red/green double hallow. TV is six (6) years old. any idea what's wrong?


If this happened suddenly and the red and green images are bowed in at the center of the top, bottom and both sides, one of the convergence amplifier IC's has failed. The part number is STK392-120. Make sure it is a genuine Sanyo brand replacement; there are a number of cheap imitations out there that do not last. Generally they cost less than $30 each.

Note: there are two of these in each TV. They are notorious for having a high failure rate, so I usually replace both. (FYI: each chip has three amplifiers. Each color gets two amplifiers, so one color uses an amplifier on each chip. That's why we usually see at least two colors go out of whack when this problem happens.)

I assume you have already tried a different video source (DVD, VCR, etc.) to rule out input signal defects. If the problem arose right after the set was moved, either the optical alignment was disturbed or (less likely) there is a stray magnetic field near the set that is causing problems (magnetron from a microwave oven?). There is a procedure (sometimes provided in the owner's manual) for adjusting convergence using the remote control that can fix minor alignment problems. If you want to gamble it is not a hardware failure, try it first along one edge of the picture.

If you cannot shift the red or green dots in the convergence pattern, stop immediately, and make a note of where and in what direction you tried to move the dots. Inability to converge the dots is a strong indication the convergence amplifiers are bad (that is their job - to keep the colors lined up with each other). You will need to undo any adjustment attempts after you replace the convergence chips and any fuses or resistors that got burned when they went out, so don't make too much extra work for yourself or your service tech.

Oct 27, 2010 | Philips Magnavox 51MP392H Rear Projection...

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...

2 Answers

I have this same problem with the PT51HX41E but in the convergence menu the green and red are allowed to move. but the blue on the right side of the screen is not allowed to move and it looks like its...


My first guess would be a bad convergence amplifier - this is common, although usually all three of the amplifiers in the integrated circuit die at the same time, which throws off at least two colors and creates a "bow-tie" effect. I surmise you have half of a bow-tie in blue only.

If you could look at the blue output waveforms with an oscilloscope, you would see right away if this is the problem (flat-line instead of sawtooth wave). It is possible that both of the blue convergence amplifiers are working, but one output is not getting to the blue deflection yoke.

Don't mess with the convergence anymore until you get this taken care of. Changing the convergence now will only make it harder to get it back to where it should be once the circuit is fixed.

Sep 22, 2010 | Panasonic PT-51HX41 51" Rear Projection...

1 Answer

What is a convergence amplifier


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

Aug 06, 2010 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

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...

1 Answer

IC replacement didn't solve convergence problem for 57HX83


the convergence in any tv is as this analogy:
a pencil, a hand and the brain.
i would say the pencil is the joke and the ic (convergence amplifier) together.
the hand is a copy of a program that always do the same.

and the brain has an original program plus the eeprom to help him.

and what ?(maybe you can say)
  • dont worry about the brain first.
  • repair the conergence (three rectangules in the screen ***maybe not matching*** red blue and green) but perfect rectangule
Pencil:
To make this in your tv maybe you have +/-20 v maybe missed. the IC convergence amplifier damage. all resistors o some burn or different value or need new amplifiers. fixing this you get your rectangule.
Hand:
is easy to know in the copy of the program is corrupted first because the screens are miss matching that make some areas look as colored color Shadows but at least you can adjust up down east west each color in any point with the simple users menu. (you dont save in memory but your tv now looks now good adjusting here. but next day: bye bye adjustment.
the brain.
if your tv need this kind of solution. you need first to know how to navigate inside the manufacure native program. and second this kind of repair is so critical that you need to buy the parts that maybe have not program at all. and you need to download that with manufacture original program and make sure your program corresponds with the version of that particular tv (dont worry most of the time the program it shields perfect so most of the time you dont lost it, (but the don't even thing to start to dig in that area, better take it easy and resolve it in the other steps). good luck!

Apr 18, 2009 | Toshiba 57HX83 57" Rear Projection...

1 Answer

TP61H95 Toshiba Cinema Series 61" The Image rolls


defintly the convergance.if the con is on a small board ,maybe 130 big board 250&up.if u know how to solder 35$ each STK and u need 2. and check each internal fuse with a ohm meter with tv power unplugged

Mar 12, 2009 | Toshiba TP61H95 61" Rear Projection...

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