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

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Convergence amps After the TV has been on for 10-15 minutes all the other heat sinks in the back are warm or hot except the heat sinks attached to the amplifiers. Does this mean that both are bad or is there a relay or fuse that has tripped. I have ordered two new Sony convergence amps but do not know if this is the solution. Please advise. Thank you

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  • brulia Nov 02, 2007

    The amps have been replaced but they are still not getting power. Any other advice?



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Well if the colors are off and give a 3-D affect it is the amps

Posted on Oct 31, 2007


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I have multiple colors on the screen of my 530hd pioneer elite TV when it warms up. When I try to adjust the convergence I am unable to move the red line far enough to converge on the blue or green line.

The convergence of your tv is defective try to replace it. You will find the convergence chip inside your tv, try to open the back cover of your tv but be sure to unplug the tv first. Try to look the large aluminum plate it is the heat sink, your convergence chip is attached to that heat sink it has a marking of stk-*** followed by a number you should remove it from the pcb using a soldering iron, and soldering pump but be very careful you might damage the pcb and may caused another fault to your unit. Or you can contact a service technician to save you from stress. Good day and best regards.

Jul 19, 2011 | Pioneer PRO-530HD 53" Rear Projection...

1 Answer

Power tv on and then it clicks and turns off

Most of the time there are one or more 5 amp pico fuses open on the power supply. The cause of them opening is the +/- 30 volt line shorting from the convergence circuit. If you take this repair on yourself and are familiar with a ohm meter, you can check the small green pico fuses in the power supply. Remove the power from the set, take the back off. The board in the center is the power supply and convergence circuit. In the center of the you will a transformer. Just to the left of the transformer you will small green fuses that look like resisters. They are marked on the board but are sometimes hard to see. If one is open for the 30 volt line, the convergence IC's need to be replaced. They are mounted on the back of the large heat sink and the board must be removed to replace them. When you remove the board, be sure to remove all the screws not only around the edges of the board but also in the center too. There are also screws on each end of the heat sink and on the blind side center foot securing a ground wire. On each side of the board there are plug clips that must be lifted. At the front of the board there are plug connectors that need to be unplugged. Once the board is removed the IC's are easy to replace. Remove them from the heat sink, Unsolder them from the board using solderwik. The Convergence IC's should be STK392-570. If there is only one, it is a STK393-110. When replacing them, I recommend using heat sink compound on the back of the IC's where they contact the heat sink. solder in the new IC's then attach the heat sink to them.
Replace the small pico fuse or fuses, they should be rated at 5 amps. Once all the parts are replaced, remount the board making sure the heat sink holes align with the board holes. Reconnect the plug connectors, Plug clips, and reinstall all the board screws.

I hope this helps,

Dec 12, 2010 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

Toshiba 51HX93, rear projection T.V. Green convergence problem

You will need to change both of the Convergence IC's----if you go to the trouble to just change one the other will fail in a short time---what happens most of the time is the white heat sink grease that was applied to the back of the two chips has dried out and one gets too hot and fails.

Most of these sets use 2 STK-392-110; WITH THE BACK OFF use a flashlight and you should be able to see the number on them; they are located on identical metal heat sinks with fins.

If this has been helpful I would appreciate a vote from you here. If you require more assistance respond to this post and I will help.

Aug 17, 2009 | Televison & Video

1 Answer

Where is the convergence IC located on a Toshiba 42PH95?

Unplug the TV and wait a few minutes then remove the back panel. There is a circuit board with a large heat sink almost centered in the opening. The heat sink will have large black IC's attached to it. You can see STK###-### printed on them and they have 18 or more pins (depending on specific STK#) coming out of the bottom.

Jun 19, 2009 | Toshiba 42HP95 Television

1 Answer

Hitachi 42" TV

This is a problem with the convergence circuit. If you can solder, try resoldering the pins on the convergence ICs. If that fails to resolve the problem, replace the ICs. These ICs are large and black, attached to a heat sink and are marked STKxxx.

Keep us posted on your progress.

Jun 19, 2008 | Hitachi 43FDX01B TV

1 Answer

Toshiba 61H70 Weird Convergence Issue?

They may have gotten some cheap convergence ICs, thats a real possibility. I would recommend switching the two origional STK392-110 with some STK392-150 they will run alot cooler and last alot longer. Just use a good coating of heat sink compound on the back of the ICs. I will post a link where you can get top quality Convergence ICs and they provide free instalation instructions with pictures so you can do the job yourself in under an hour and save quite a bit of money. Heres the link.

May 22, 2008 | Toshiba 61H70 61" Rear Projection...

1 Answer


Chances are it's the STK392-110 convergence IC's....check for blown resistors in the area of the STK's also. It's a really simple solder job. I'd suggest buying a desoldering tool (about $30 off ebay for a good iron style with spring loaded "******") and I'd also suggest replacing BOTH stk's and not just the one. NORMALLY if it's only one STK that's gone south - if the TV is on you can see the STK's with the back cover removed, they are attached to large heat sinks, and look like black blocks....ONE of the heat sinks after operating for a half hour or more would be noticeably hotter if it's burned out. Touch CAREFULLY to check for heat with power on (duhhh) and beware that if the STK is failed - the heat sink may be VERY hot. Heat would be the indicator that something has failed miserably.

STK392-150 is an upgrade part# to replace STK392-110, and they will last longer due to higher heat tolerance. If you're going to replace the STK's - get the 150's, and MAKE CERTAIN they are authentic sanyo IC's. The generic **** won't last long.

May 17, 2008 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

Convergence problems

you need to see whats in your tv first and how many most had 2 some have three
you will see a very large heat sink and the IC attached to it.

Feb 19, 2008 | Panasonic PT-53TW53 53" Rear Projection...

1 Answer

Replacing Convergence Amplifiers

you might be lucky with just the amps ck for pico fuse's around the heatsink they are usually yellow, look like resistors one might be open

Oct 14, 2007 | Sony KP-57WS500 57" Rear Projection...

2 Answers

Convergence IC,s overheat

the ic is getting too much voltage check a diode that feed into the ic it has a short.if you dont locate that defected component it will cost you much more than the set lol.good luck

Apr 23, 2007 | JVC AV-56WP74 56" Rear Projection...

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