Question about Sony KP-57WS500 57" Rear Projection Television

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Colors not aligned and picture arched.

I found the STK packs on the heat sinks, but cannot see how it is mounted into the circuit board. Once the screws are removed, can it be unplugged... or do I have to remove the entire board and solder it in to place?

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  • zhaovalley Jun 21, 2008

    I changed the two STK oacks, but the focus is still off. Is there an ajustment I can do to realign to get rid of shadows or double images.

  • tabucklew Jun 23, 2008

    tv fine when turned off last night. turned on this morning, picture arched and colors not alligned. what is the problem?

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I have had the same problem with my tv.I have replaced the 2 stk packs and have had the same result.So I called a tv repair man to the house and gave me a $400 estimate.I have come to far to give up fixing the TV myself!! So I started to check voltages on the power board and found on the 9 pin connector (right when you pull the back of TV panel off its right there)there all printed on the board.Check all those voltages,especially -22 and +22.Put your meter ground on the wire in between those 2 wires and check both.If either are not there,remove board and you will find about 1" in from that connector 2 orange resistor looking components,they are solid state fuses.Use an ohm meter to see if either are blown.there desigination on the board is5001 and 5002.I replaced one with an automotive 5 amp mini fuse soldered to two 1" pieces of wire.plug back in check for powers and if all good do following,press in order on remote display button then 5 button then volume + then power button all within 5 sec,you will see bunches of #s and letters.Then press 8 then enter,the tv should shut off.this is master reset for TV and starts whole tv like you just took it out of box.TV should be fixed

Posted on Jun 29, 2008

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2 Answers

The tv looks like it is in 3d. when i try to adjust the convergiance the plus signs on the left are bent


do not play with this tv replace the stk ic chips and the resistors around the stk chips ,cant miss em about 2 inches big with heat sinks on them.

Sep 11, 2010 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Hitachi convergence problem


You need to re-solder the circuit board that contains the STK convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall, about dead center in the circuit board. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. Take the appropriate cautions working around the high voltage of the set & use a non-conduting piece of wood to push the heat sink when we doing tests.
Best of luck, hope ya fix it.

Jan 22, 2008 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Colors won't align


The convergence amps have failed. This is pretty common on rear progection TVs. The standard fix is to replace the 2 big heat sink mounted modules (they should be part number STK _ _ _ ) and also look for any small low ohm resistors in the surrounding circuitry that may be burned. Then you have to perform the convergence procedure (get the service manual). You can do it yourself, but probably going to want a local TV guy to do it.

Dec 31, 2007 | Projection Televisions

2 Answers

Tv turned itself off. turn power back on, picture


Your TV is experiencing a convergence issue as indicated by the 3 blinks. The only way to fix this is replacing the convergence ICs. It is not a hard task to replace these ICs. You just need to know how to solder and work on printed circuit boards.

The convergence ICs are mounted on a large heat sink and are marked with codes starting with the letters STK and there are two of them. You need to replace both.

Look for the heat sink with two ICs mounted on it and check the markings.

Once found, cut the IC legs with a small side cutter and unscrew it from the heat sink. Remove the legs left soldered on the board.

Take note of the IC markings for ordering the right part and how it was installed. Don't forget to buy along with the IC a thermal compound.

Check the pico fuses on the same board. Most likely you will find a blown one. These fuses look very much like a resistor, not like the usual transparent fuse, and usually yellow.

Once you have the replacement ICs, put it on the board in the same way as it was installed before. Make sure the screw holes are aligned before soldering the legs into the board.

Put a reasonable amount of thermal grease/compound between the ICs and the heat sink and fix them with the screws.

Double check the board for any splash of solders that might cause a short circuit and damage the board.


Dec 07, 2009 | Panasonic PT-47WX53 47" Rear Projection...

1 Answer

Hi. i have a 54 inch samsung rear projection tv. 2 years ago something happend within the tv and the picture was doubled. and there were red lines going through the tv. i had sears come out today and look...


Hi,
This sounds like the most common thing that fails on projection TV's, regardless of the brand. The convergence circuit has two, or sometimes three STK IC chips mounted on heat sinks to drive the convergence yokes. They typically last anywhere from 5-10 years, then they fail.

It sounds like in your case, the solder joints on the bottom of one of these chips may be failing and some fresh solder will make it go for a while. I would recommend you to replace both the STK chips.
These ICs are used to align and keep aligned the three colors on the screen...

INSTRUCTION TO REPLACE CONVERGENCE ICs:

The parts you will need are two ic's that are referred to as STK ic's. This is in reference to the first three letters of the part number. You will also need some pico fuses. The pico fuses are little yellow fuses that look like resistors. When they blow, they will show no physical sign of failure. The amperage rating will be printed on the fuse. For example a 5 amp fuse will have the number 5000 on it. A 3.15 amp fuse will have the number 3150 on it. You will need to use an ohm meter to test these fuses

The stk ic's are on the "D" board, attached to large heat sinks, When looking from the back you can see the heat sinks but the part's themselves will be pointing away from you and hard to see without removing the board, or using a mirror to look at the part numbers. The fuses are generally located under the fins of the heat sinks. There are several of them and vary by model. On the "G" board there will be two yellow pico fuses near the connector going to "D" board. These fuses provide power to the stk ic's you must check these as well.

When replacing the STKs make sure you use heat sink compound on the back of the ic's before installing them. Also as a rule of thumb, screw or clamp the ic's down to their heat sinks before you solder the pins. Replace any blown pico fuses and re- install your boards. When you turn your set on it may still be out of convergence due to many factors. Try pressing the auto focus button on front of your set.

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Rnj VINODKUMAR

Nov 11, 2009 | Samsung Projection Televisions

2 Answers

The 3 colors are off, i have shadows and arches in the screen


It is failure of convergence ICs and these two ICs will be replaced on D board.
If you are comfortable with TV repair and know good soldering skills then can do the job easily.
Convergence ICs are mounted with sliver heat-sink on D Board of TV and part number will start with letter STK...
Get back to me if you need further info.

Jan 17, 2009 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Sony 57 inch


Hello

there is two STK packs in your TV, this is what controls your convergence,it should be two big IC on big heatsink and number should start with STK- ______,just replace these STK packs and you can order these from matelectronics.com. Parts should be somewhere around $30 and also make sure that resistors around stk packs don't look like they been hot if they look like they been hot just replace them too, and your TV will be working fine.

Thankyou

May 11, 2008 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Colours not mixig together


You have a problem with the STK convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. The "factory" job was good enough for 3-4 years but the heat (and these modules do create a lot of heat) and stress created from repeated use eventually takes it's toll, weakens the pin connections and our problem occurs. take the appropriate cautions working around the high voltage of the set & use a non-conducting piece of wood to push the heat sink when doing tests.
If soldering doesn't help, then the modules have died and need replacing. Don't buy the $10 cheap ones. Most of them have an upgraded version that is stronger. Also look for any burned resistors in the vicinity of the modules.
Best of luck, hope ya fix it.

Mar 06, 2008 | Samsung HCN436W 43" Rear Projection...

1 Answer

Problem With Colors


You need to re-solder the circuit board that contains the STK convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall, about dead center in the circuit board. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. This is a caused by a minimum effort (a.k.a. minimum cost) solder job, probably done in some 3rd world sweat shop. The "factory" job was good enough for 3-4 years but the heat (and these modules do create a lot of heat) and stress created from repeated use eventually takes it's toll, weakens the pin connections and our problem occurs. take the appropriate cautions working around the high voltage of the set & use a non-conduting piece of wood to push the heat sink when we doing tests.
If this doesn't work, the modules need replacing.
Best of luck, hope ya fix it.

Feb 01, 2008 | RCA P52926 52" Rear Projection Television

1 Answer

Sony Rear Projection Screen


replace the stk ics. they are located inside the tv with lage heat sinks. i do believe sony runs stk392-510. youll have to look at the ics to know which ones for sure.

Sep 16, 2007 | Projection Televisions

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