Question about Sony KP-46WT500 46" Rear Projection HDTV-Ready Television

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Replacing convergence (stk392-560)

Any idea on how to properly remove the old convergence aside from the two small screws. i notice the convergence is glued or welded to the metal plates. plus is there a need of heat compound in able to install a new convergence if so please advised. thank you again

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They are solderd in. the heat sink compound will harden making it a little difficult to pry them from the heat sinks but they will come loose. be sure to apply new heat sink compound available at radio shack. You can get new ICs STK392-560 here.
http://servicemanuals.vstore.ca/

Posted on Apr 25, 2008

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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,
Skyassoc

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

Tip

PANASONIC CONVERGENCE DO IT YOURSELF REPAIR


So many people ask me about this here are my Instructions if convergence will not adjust and or is skewed:



Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} PANASONIC CONVERGENCE IC REPLACEMENT:
What you will need;
Two new STK-392-110 convergence Ic’s
Solder
Liquid solder flux
Desoldering braid or wick
A good soldering Iron
Some denatured alcohol
A small toothbrush
A Philips screwdriver or screw gun to REMOVE SCREWS
A PAIR OF GLOVES
  1. UNPLUG TV SET.
  2. Remove back cover of TV set.
  3. Remove entire front speaker grill on set(it pulls off and may resist being removed)
  4. Locate and unplug speaker wires (they are plugged into the main circuit board).
  5. Locate three cables with wires that come from the Front keyboard—two of them have to be unplugged from the main board(all plugs are different sizes but note where they go)
  6. Remove 2 long philips silver machine bolts from the front of the set (behind the grill).
  7. Remove 4 more in the back of the set; two are located at the extreme back edge of the plastic frame and hold the chassis down; two more are located on either side and also go straight down; note which are which and set them aside.
  8. Using gloves pull the entire metal box (it is called a light box) out of the set; there are hand holds on either side—careful as the metal has sharp edges.
  9. Remove the box from the set and locate the two Convergence IC chips; they are located on identical metal heat sinks with fins and they should have the STK-392-110 number clearly printed on them in white (they are black)
  10. Turn the light box over on its side and UNSOLDER ALL 18 PINS ON EACH IC. It is a good idea to apply liquid solder flux to the pins on both chips now. I recommend using a de-soldering braid for this—get all the pins completely de-soldered.
  11. Inspect the dozen or so light blue resistors in front of them; most are marked 2.2 ohms—if any are white in the middle you will need to replace them at the same time; best way is to check all of them like checking a fuse----they protect the set if one of the STK’s shorts in any way.
  12. With the STK’s completely unsoldered turn the box upright and remove the two screws on each IC. If the chips have never been replaced you will need to tap them loose with a putty knife or flat bladed screwdriver.
  13. Remove both IC’s.
  14. Apply heat sink grease to the two new IC’s and install them one at a time; this part can take some time and it is important the pins on the new IC’s are perfectly straight---once you get them in, Hand tighten both the screws on each IC---do not use a screw gun—you can strip the screw holes out. Clean the bottom of the circuit board where the chips were soldered with some denatured alcohol and apply liquid solder flux to all the pins.
  15. Presuming you have already found/replaced any bad resistors turn the box back over and solder carefully both of the two new IC’s in, --do not short any of the pins to each other when you do this and when you are done it is a good idea to take a close look at both to make sure all pins are soldered and not touching each other with soldering you have just done. I suggest you do clean the pins on the bottom of the circuit board again with denatured alcohol.
  16. Slide entire light box back into the cabinet.
  17. Reconnect the plugs you removed when you removed the box. At this point take a lens cloth or a paper towel with glass cleaner sprayed on it and clean the three large black lens-if they are dusty the picture will be darker and not as clear as is should.
  18. Position the box so it is all the way in place and none of the wires or plugs are pinched.
  19. I usually at this point turn the set on before I replace the Six bolts that hold it in—2 from the front and the four in back----this way if you have a problem you can remove the box faster.
  20. If the set comes on and now has normal Convergence go into the customer menu and adjust the convergence in the multi-point mode----CAREFUL! THE FIRST OPTION this set usually offers is a green cross in the middle of the screen—do not adjust Green!
  21. Once you have the Red and Blue in the center adjusted find the second convergence mode---it will give you 8 or nine points on the screen with instructions on how to change from blue to red---use the original remote with the thumb wheel or cursor buttons to adjust.
  22. NOTE: SOME of these sets need to have the Convergence adjusted in first: full/4:3 and second in the other two zoom/wide zoom and third on the HD input with a HD signal coming in. There is also an option at this point to go into the Technical menu and fine adjust the convergence all over the screen—if you need this I can give you instructions based on the model you have—most of the time adjusting the set in the customer mode will produce a good result.
  23. I know all this may seem complicated to you, but this repair should take about an hour or so and just take your time when you get to adjusting the set.
  24. If all looks good turn the set off and Unplug it; install all 6 of the chassis bolts back; replace the back cover and the Speaker grill and plug the set back in.
  25. You may find it useful to go over the convergence Adjust again—to get all the points as good as you can. There is a hidden Tech menu that will allow a finer adjustment of the entire screen----it is somewhat difficult to access and there are a lot of buttons on the remote that then do different things.
  26. Most of the time adjusting in the customer menu will give you a very acceptable picture.

SD TECH

on Dec 01, 2009 | Projection Televisions

1 Answer

Please post instuctions for convergence chips for ws-55809


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Mitsubishi convergence IC replacement: this applies to sets that use (2) STK-392-570

The Idea here is to get the Middle Circuit board out so you can replace the Convergence Ic’s.


HERE is what you will need: (most of this you can buy on the internet or at local electronics stores)

Two new: STK-392-570 CONVERGENCE IC’S
One good soldering iron
Solder
De soldering braid or wick
Liquid flux
Heat sink compound (grease)
Denatured alcohol
One short Philips screwdriver
One small clean toothbrush
One electric screw gun to REMOVE screws

Turn the set on and examine the picture for how the Convergence looks bad---when you are done examine it again---once in a great while you will get and install a new IC that is bad. Remember this when you have finished—if the convergence is still bad but different from what you started with you may have installed a new I.C. that was bad. Turn the Set off.


  1. Unplug set.
  2. Remove back cover.
  3. Remove front speaker grill and inspection plate behind it.
  4. Remove the 2 or 3 black screws that go thru the back edge of the plastic frame that hold the chassis down.
  5. Where all the video and audio jacks are on the right edge of them you will see a diagonal plastic (Black) remove the two brass screws from the outside edge, remove another to the right bottom and a third smaller screw forward and to the left; remove plastic piece and all four screws and set them aside.
  6. Look carefully at main board in center of the set.
  7. You will find a number of screws hold it into the plastic frame.
  8. Towards the left back edge of this (to the right of the plastic you removed) you will find a metal cover with a small screw on either end. It has a lot of round holes punched in it.
  9. Remove both screws and pull the shield up and off---remove the board beneath it by releasing the two tabs on the bottom right side and pulling the board out—handle it with care as it is the digital convergence board that stores the set’s memory of adjustments. Set it aside
  10. At this point you need to pull the entire Chassis back at least a few inches---If it does not slide back look for a plastic latch on either side near the front of it. Some sets have the latches on the left or right side—black plastic tabs that lift up.

Nov 18, 2009 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

I have a 52 inch RCA projection TV about 15 yr old today the colours are not lining up causing a shadow of red behind white lettering and looking like a 3 D show withought wearing the proper glasses?


you need to replace the convergence supply board, if it's one of the earlier models, you change the chip stk730-130 that will fix it. the board is small and up off the chassis to the right slightle, 4, 1/4'' screws holds it in place.
you might be able to get a whole new board, which would require no soldering to fix.

Sep 15, 2009 | RCA P52926 52" Rear Projection Television

2 Answers

HD image has lost sharpness


You will need to replace the convergance IC's if the colors are no longer lined up and they won't line up using the tv's controls. Also, if the crt lenses have a lot of dust on them removing that will help the sharpness and brightness of the picture. Don't use canned air. Get a crt lens cloth.

Jul 07, 2008 | Akai PT5598HD 55" Rear Projection...

1 Answer

Ive replaced the entire convergence board and now...


Check the connections on the small OSD board where the convergence board wire clip plugs into it that small board may not be seated properly.

Jun 05, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

JVC AP48WP34 No Menu


Check the wire clip that runs from the convergence board up to the small vertical board that stands up on the large signal board. That clip plugs into the top of that small board the small board that stands up is what controls your menu.

May 27, 2008 | Hitachi 60SX12B/13K 60" Rear Projection...

1 Answer

5 year old tv


Mine is Toshiba 55 TZ, have it since 98', shutdown and red light blinking problem, search the net and found out, generally a Convergence IC (stk392-110) problem. bought 2 for $15 at suburban-elect.com (ebay). replaced following direction from http://www.casiasfamily.com/repairlog/tp50h15.html

Open back cover, 9 screws and wirings (pls mark), removed(soldered) a electronic board infront of convergence ic. removed IC (stk392-110) (screwed and soldered).

Replaced everything and voila...! it is now working again..
no more shutsdown and red blinking light. Saves mo $400 for a repariman. of course just be careful with static and stuff.

I don't know how to solder, so I ask friend to do it for me. But I did the rest. Just to give you an idea that it can be done even if you don't know much about electronics. This in no way a recommendation but just stating my experience. Follow at own risk.

Feb 16, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

Toshiba 50h81


it happens to my toshiba.. once in a while and gradually shutsdown every minute during the last 2 mos..

Mine is Toshiba 55 TZ, have it since 98', shutdown and red light blinking problem, search the net and found out, generally a Convergence IC (stk392-110) problem. bought 2 for $15 at suburban-elect.com (ebay). replaced following direction from http://www.casiasfamily.com/repairlog/tp50h15.html

Open back cover, 9 screws and wirings (pls mark), removed(soldered) a electronic board infront of convergence ic. removed IC (stk392-110) (screwed and soldered).

Replaced everything and voila...! it is now working again..
no more shutsdown and red blinking light. Saves mo $400 for a repariman. of course just be careful with static and stuff.

I don't know how to solder, so I ask friend to do it for me. But I did the rest. Just to give you an idea that it can be done even if you don't know much about electronics. This in no way a recommendation but just stating my experience. Follow at own risk.

Feb 05, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

Convergence problem


This is by far the easiest TV to replace the convergence ic's - you don't even have to take the back off! Remove the front panel by removing the screws on the back edges secured to the front to the cabinet,also remove the small screw behind the front control door - the front comes off - remove access panel,there you will see the convergence board right in front - unplug the connectors to the board - pull it out and replace the ic's (2)part# STK392-110. Also check for any burnt or discolored resistors near the ic's - they may need replacing

Aug 20, 2007 | JVC AV-48WP74 48" Rear Projection...

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