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I replaced the Convergence ICs (STK392-120) in my Magnavox 51MP3964H/17, but when we soldered the new ones in, there was a solder bridge. We fixed that problem but the red is still out of whack. (Still bowed on both sides of the tv). Tried doing manual convergence and auto convergence to no avail. Help!

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  • b1tchy0ne121 Sep 10, 2009

    I checked them out. They dont seem to have any white around the middle. I thought maybe the ICs were damaged due to the solder bridge. But then again Im not the expert lol

  • b1tchy0ne121 Sep 11, 2009

    I went into the tech menu and there was an error code 9, which in the 2000 page service manual says "Bocma IC TDA888xx 8V failure (SUP bit)" then under that it says in bold letters "Significance changed to" HCS-GDE communication failure" I have no idea what that means. It is an HD set. Everything on the screen looks pink too. Im not sure what I did there.

  • SD Tech
    SD Tech May 11, 2010

    If you shorted pins when you soldered the chips in you could have damaged one of the chips--the resistors can be checked with a ohm meter(like checking a fuse---no reading across any means open) DID YOU TRY TO ADJUST THE SET IN THE CUSTOMER MENU OR THE TECH MENU---SOME OF THESE SETS NEED A LOT OF ADJUSTMENT AFTER THE CHIPS ARE REPLACED---to enter convergence tech menu: use the philips remote---0 6 2 5 9 7 and hit status button----instructions will appear on the screen--see if it will adjust in this mode---takes some real time with these sets to adjust and the HD if it is a set with HD has to be adjusted separate. Adjust red first and then blue. SD TECH

  • SD Tech
    SD Tech May 11, 2010

    check all the 6.8 ohm green resistors near the chips---any that are white in the middle are gone. If not, you may have got one of the new chips.

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Check the resistors around the amps. Many times one or more resistors are blown, but they may visually look fine.
Check all of the pico fuses.
Also,

Posted on Sep 11, 2009

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My magnavox HDTV model #51MP392H/17 the year on the back of the tv is 2004 the picture on the screen looks like its in 3D how can i fix it myself. I tried a new cable box it only worked for a few minutes...


The convergence ICs and resistors have failed. You will need to install a convergence repair kit. The Phillips DPTV305 chassis convergence repair kit is the correct one for your magnavox. Its available at www.tvrepairworld.com and the kit contains the 2 ICs and resistors and the CD with repair instructions.

Jun 16, 2011 | Philips Magnavox 51MP392H Rear Projection...

Tip

How to change projection TV convergence ICs.


NOTE: THIS PROCEDURE DOES NOT APPLY TO RCA CHASSIS MODEL ITC222. FOR THAT MODEL CLICK HERE.


When the picture on your projection TV looks like 3D, the image bows in on all sides and red/green/blue are separated you have bad convergence ICs. They are located on the mainboard attached to a large aluminum heat sink. The heat sink could be shiny or black depending on the manufacturer. They are generally located near the rear of the High Voltage/Power supply board. The ICs are shaped like a trapezoid. I have a picture of one at the end of this tip. It is for identification purposes only, your actual part number may be different. Make sure you get the correct units.

Once you have located the ICs and heat sink look at the numbers printed on the ICs. The numbers on them should be of the form STK392-XXX. Note the number and go to http://www.encompass.com and order two. One is for horizontal and one is for vertical. You should also go to http://www.mcmelectronics.com and if you do not already own one order a good solder iron (40 watts with conical tip, temp control would be helpful), solder wick, heat sink compound, solder puller and solder.
You will need good soldering equipment and skills. Do not apply too much heat to the connections on the underside of the board or the lands will come off causing bigger problems. The secret to soldering/desoldering is to have a hot iron and concentrate on one part at a time. Keep good contact with the piece being soldered/unsoldered.

In addition you must have a clean tip to do a good job and get the soldering done in the shortest period of time. Use a good tip cleaner (looks like a kitchen scrubber) which can be purchased at the site I mentioned or a substitute you may have, steel wool or a damp cloth. All work about the same, the important part is that the tip is kept clean.

Sometimes you need to remove the heat sink to install the IC's leads due to the number, and difficulty, of getting them in the proper holes. This usually requires removing several screws from the bottom of the board or unsoldering the hold down tabs and possibly straigtening them to get them through the holes in the circuit board depending on your particular model. The ICs can be removed from the heat sinks by removing two hold down screws and prying them loose from the heat sink. This can sometimes take quite a bit of pressure.

Another problem to watch out for is bridging of the leads when resoldering the IC into the board. Before powering up the unit make absolutely certain that no leads have been soldered together or "bridged". Correct any issues. You do not need a large amount of solder on the leads. A nice round smooth connection is best. Look at some of the other solder joints to see what a good solder joint should look like.

If your eyes are like mine it would pay to purchase a pair of magnifying binoculars from the same site you can get the equipment from, http://www.mcmelectronics.com .

After replacing the ICs check all the resistors and microfuses in the area of the convergence ICs for opens. The fuses will look like resistors but no color code.

Remove the old ICs from the board and install the new ones. Be careful not to get the units too hot when installing the new ones. The heat sink compound goes on the back of the ICs in a thin coat to aid heat disapation. Don't over do it! Also clean all the old heat sink compound off the heat sink.

Once the ICs have been replaced and the unit is up and running you will need to set the convergence to align the beams. You should be familiar with this, if not the procedure should be outlined in your operations manual. If you lost your manual go to http://www.retrevo.com to get a new one for free.

If this was the only problem your unit should now look fine. While you have it apart you should clean the lenses and the mirror with a soft lint free cloth and window cleaner (no ammonia). Always spray the cloth, never spray inside the TV.

If the lines still will not converge you have a bad digital control box. Detailed intructions for removal and replacement of the digital box are located at my tip http://www.fixya.com/support/r4273935-replace_digital_convergence_box .

8520202.jpg

Example of a convergence IC. Your part # may be different.

Thanks for using FixYa.

hardrocko

on Feb 27, 2010 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

How to replace convergence ICs in samsung


You will need:
  1. Convergence ICs.
  2. Heat sink grease or thermal compound.
  3. Soldering iron.
  4. Solder lead.
  5. Digital multimeter.
  6. Solder pump.
  7. Small side cutter.
Steps:
  1. Unplug the unit from the AC outlet.
  2. Remove the screws and take the back panel off the TV. The convergence ICs are located behind a large heat sink.
  3. Remove the board that the ICs are on.
  4. Check all the big resistors on the board using the digital multimeter. Some resistors are connected in parallel so they read half of their nominal resistance.
  5. Check the board for cracked solders and tracks.
  6. Cut all the legs of the ICs and unscrew them from the heat sink to take them out.
  7. Remove all the legs by applying soldering iron on one side and pulling on the other side.
  8. Clean the holes for the new ICs with the soldering iron and solder pump.
  9. Clean the heat sink from the old thermal compound or grease and apply the new one to the ICs.
  10. Fit the new ICs legs on the holes and screw them to the heat sink. Wipe excessive grease. Make sure they are making good contact with the heat sink.
  11. Cut excessive length of legs. Leave about 2mm and solder it in.
  12. Clean solder points with lacquer thinner or even alcohol.
  13. Make sure no solder is going to two legs at the same time.
  14. Put all back together.
  15. You may need to readjust the convergence on the menu.

Oct 24, 2009 | Samsung HCN653W 65" Rear Projection...

1 Answer

Black Bars and Power Issues


Sounds like a solder bridge bewtween the IC pins double check the solder for any pins accidentally bridged with solder.

Sep 06, 2009 | Televison & Video

1 Answer

Magnavox 51mp3964H/17


You need to replace Both of your STK convergence ICs they are big black ICs will have part number on them STK392-110 ,ect if you can solder you can fix it your self ,TV repair shop m/b 300.00 also you will need Service Code to be able to enter into TECH alinement mode .Call Mats Electronics for parts 1-800-628-1118

Aug 18, 2009 | Philips Televison & Video

1 Answer

Phillips projection tv will not converge


Replace Both convergence ICs STK392-120s use 180s better ICs they are big black ICs will have STK on them Mat Electronics for parts 1-800-628-1118.Also CK 6.8 ohm resistors around STKs.

Dec 30, 2008 | Philips Magnavox 51MP392H Rear Projection...

3 Answers

Magnavox MDL 51mp3964h distorted and waved picutre


Hello pkrocks

It looks like your convergence amplifiers have gone bad, this is a common problem. If your set uses the STK329-110 or STK329-xxx series of amplifier both of them will have to be replaced. There is a lot of information on fixya about how to do this yourself, but you have to be careful in removing and replacing the amplifiers and the associated bias resistors.

I hope this helps

Thank you,

Shuttle83

Sep 15, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Rain bows


Hello keriro74,

Your convergence amplifiers ICs have become defective, They will have to be changed out. They are usually marked with a STK392-110. You will have to also change out the fusable links connected to the STK392-110. Desolder the pins and unscrew the ICs and remove both of them. Then desolder the fusable liks and replace them with the new ones, then insert the new ICs and solder them in (being careful not to create solder bridges). Then you will have to perform the convergence on your TV, Try to use Auto-Convergence to do this.

I hope this helps

Thank you

Shuttle83

Sep 09, 2008 | Philips Magnavox 51MP392H Rear Projection...

2 Answers

How do you replace the convergence part on a Mitsubishi big screen tv Model WS55511? The new part has prongs on the bottom and I don't know how to attach them.


they have to be soldered in place after you de-solder the old ones. Radio shack has a de-soldering iron with a rubber bulb that makes this easy. Then solder your new ones in use a pencil iron 30 watt also available from radio shack. Use heat sink compound on the back of the ICs where they contact the heat sink. This compound is also a Radio shack item. Just be careful not to bridge any of the pins together with solder. Check your solder with magnifying glass before powering it up

Jan 31, 2008 | Televison & Video

1 Answer

Akai pth 5498


Your Convergence amp ICs are bad. Heres how you fix It.
they are located on a huge heat sink inside your set. Just look for the largest aluminum heat sink inside your set. You will notice them they are large black ICs with about 16 pins on them. Just unsolder the old ones and solder in the replacements. just be sure to put some heat sink compound on the back of the new ICs where they contact the heat sink. You can get a de-soldering iron at radio shack with a rubber bulb to make the de-soldering alot easier and you will also need a low wattage soldering Iron to solder in the new ones. Just mark any wires you remove to get the convergence module out. That way you will know where the wires plug in when your finished. It will need a convergence adjustment when your finihed. Be careful not to bridge any of the pins with excess solder. Inspect the pins with a magnifying glass when your finished to make sure the solder from any adjacent pins arent touching each other.

Jan 06, 2008 | Akai PTH5498 54" Rear Projection...

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