Question about JVC AV-56WP74 56" Rear Projection HDTV-Ready Television

2 Answers

Removing ic's from heat sink

I'm having a hard time taking the ic's out. the legs are bent and there is hardly any room to put a soldering iron. Whats the best way to go about taking the ic's off of the heatsink? So that I can extend those legs and get an iron on them..

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  • thehumanlynx Apr 15, 2008

    I'm having a terrible time taking those things off the heat sink. I'm nervous that I'll crack something in the board.

    grr

  • thehumanlynx Apr 15, 2008

    got em out. moving on to the new ones....

  • thehumanlynx Apr 15, 2008

    I switched the ics and I'm in the same position. The red convergence will not move left to right?!?

    Any ideas?

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  • Master
  • 2,267 Answers

I would suggest to check all the resistors R842 to R854 but specially the 1.5 ohms. One of those resistors might be open. Double check all the solder joints again with a continuity tester.
Good Luck.

Posted on Apr 15, 2008

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  • JVC Master
  • 8,617 Answers

Remove the board completely then heat the pins from the bottom side of the board and use solder wick to soak up the old solder then the ICs will need to be pried off the heat sink as the compound makes a tight bond.

Posted on Apr 14, 2008

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1 Answer

How can chang sony tv stk ic


if it is a sony check to see if any of those little green resistors are blown first. most sonys have the stk chips on the main deflection board.they will be next to each other with a big heat sink on each.have a soldering and desoldering iron ready as well as tape and marker for the wires.. remove the wires from the board you dont have to take the board all the way out. start desoldering each pin. if some pins are stuck just touch the pin with the iron. clean the heat sinks.apply themal paste to the new ics. put the new ics through the holes and start soldering. this part can be tricky. put the tip on the pin the solder will flow just quickly remove the solder then the iron 36 times and your done.

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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

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

I have a Mitsubishi 65819 and the image is beginning to distort, The image is warping so that the leading and trailing edges of the image are smaller than in the middle. There is also misalignment of the...


I am new to this fixya thing, but I have been working on televisions for over 20 years. So please let me know if you have any questions about the advice that I give.
If you can solder, solder the convergence IC's they are the big black IC's that are bolted to large heat sinks. I have found small ring cracks on the legs of the IC's. In some cases the legs of the IC's can separate from the IC's. But, overall I would say that this is an intermediate repair, and can be done by someone with a good soldering iron ~45 watts and some patience.

Apr 29, 2009 | Projection Televisions

1 Answer

How hard to replace ICs?


Remove the 4 screws going through the IC's, unsolder the 18 pins each IC, take a small flat head screw drive place it between the heat sink and IC and pound gently until the IC breaks free, wiggle the IC's to make sure all pins are free and remove them.

Take rubbing alcohol and a Q-tip and clean where you need to resolder. "So you can see the pads better." Put heat sink compound on the heat sink, slide the IC's back in, secure them with the screws, solder the pin's making sure you don't blob pin to pin.

Jul 18, 2008 | Philips 60PP9202 60" Rear Projection...

1 Answer

Mitsubishi ws-65809 concave picture


There will be either one or two of them, and they will be heavily heat sunk - as in mounted on a big heat sink, with vertical fins. That's all I can say without seeing the unit in front of me, open. They usually face towards the front, are in the middle of the middle board, and the name of the ICs is covered by a screw-on plate, which has to be removed for replacement.
Be generous with the heat sink compound when replacing the ICs, get the old stuff offa the heat sink with a putty knife if it has dried out.

To check whether you need to replace the ICs or not, with the unit on if you tap on the heat sink with something long and not conductive, like a stick, and it affects your conv - be VERY careful, this has to be done while the unit is on - you can probably get by with just resoldering the legs. If not and it just won't converge, IC replacement will be necessary. I recommend replacing both if you replace one, because next week the other one may go out and you may have to get in and out of the unit all over again.

Best way is usually to remove the entire light box, tho sometimes it's best to remove just the board, other times you can prop the whole board up and do the resoldering on your back.


Mr Bob
www.imageperfection.com

May 25, 2008 | Projection Televisions

1 Answer

Convergence issue


Its an easy repair if you can solder. just label any wires that you remove so you can put them back properly. Its just unsolder the old and solder in the new. Use the radio shack de-soldering iron with the rubber bulb it will make the job easier, and also purchase some heat sink compound to apply to the back of the ics where they contact the heatsink. They are located on the signal board which is on the left side of the chassis. change both then just do a convergence adjustment. If you need more help let me know. you will also needa pencil type soldering Iron from radio shack to resolder the ICs a 15 watt iron works best.

Mar 20, 2008 | Panasonic PT-47WX42 47" Rear Projection...

1 Answer

Samsung sp42w4hb rear projection screen fault on picture looks three like 3d can still see whats on but green and red thought is it lamps or ??


Hi.

The 2 convergence ICs will need replacing.
Providing you have got soldering iron with no bigger than 1,2mm tip desoldering braid & heat sink compound you can do it your self.
The convergence ICs are mounted on 2 x large aluminium heat sinks with fins on, The ICs will have STK 392 **** stamped on them.

http://dysonmanuals.llc.nu/

Mar 17, 2008 | Projection Televisions

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...

1 Answer

Replacing The IC's


Use a digital camera to take pictures of the chassis. Review the pictures to see if they can be used to reassemble the wiring plugs or restore the wire tie up positions. Remove the three screws that are located on the front edge of the chassis. After removing wires from their tie up positions or disconecting plugs the goal is to move the chassis into a position to expose the bottom side. Find a place to tie up the chassis using a piece of wire to one of the back screws to anchor this position. Use fresh solder wick and a 60Watt iron to remove the heat sink solder tabs switch to a 25 to 30 watt iron to remove the solder on the STK392-560 ic's. Remove the ic's from the heat sink and apply fresh heat sink grease before mounting the new ic's to the heat sink. Line the pins uniformly on the ic's if needed to install the ic/heat sink assembly. Use a flashlight or lamp to make it easier to see if the pins line up. Twist the solder tabs on the heat sink to secure it's position. Make shure all pins are present to solder in place on the bottom side.

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