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Convergence IC question...

How do I remove the white bridge things that connect the two boards together?

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  • OmarH Mar 08, 2008

    Great, I got those out.  Also I took out all of the screws and unplugged all wires.  BUt there still seems like something is holding it down... and I dont want to force it too much to get the board out.  

    I think that it may be the perpendicular board all the way in the front which attaches to the TV inputs and outputs.  Do I need to remove this and if so how?



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Those are the wire connectors between the A board and the power board. They just lift out on the power side. Take a small screw driver and just slide it under the bridge close to the end nearest the power board and gently pry they will pop off and stay attached to the A Board (conversion) There should be 4 of them

Posted on Mar 08, 2008

  • Sonny Berry
    Sonny Berry Mar 08, 2008

    There are some tabe that need to be pushed down and also the wire tie conectors have to be turned slightly as the have a liitlr edge that helps hold the PC board down. Then you have to slide it up and to the left to remove it.



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Convergence problem

Usually what happens is that the convergence IC goes bad or the fuse going to the convergence ic goes bad. Pico fuses they are called sometimes open up. You may want to open it up and pull the board out and check the solder connections on the convergence IC. Sometimes these get fractured or cold soldered and aren't making connection to the PC board.
Let me know if you feel comfortable with pulling TV chassis out or pulling the board that has the convergence IC on it out. Then you can resolder convergence IC OR replace it.First thing i would do is check to make sure there is between 22vdc and 25vdc on the fuse or the convergence IC. Let me know if this helps out any.... Sincerely HDTV GURU JAY

Mar 17, 2011 | Sony KP-57WS510 57" Rear Projection HDTV

1 Answer

The TV was unpluged for one hour. Once pluge in the blinking green light started. Now it doesn't turn on.

For starters..Your convergence board is my first concern. If you can pull the board out, do so with great care. There are many, many bad grounds here by now. I can not say this enough. The convergence IC has been separated from the board. Examine the pins and resolder as necessary. Do not over solder, you do not want to solder the pins together or you will create a short. This goes for any IC with pins you resolder. Check the diode connections, resistor connections, jumper pin connections,connections where cables jump together between boards, capacitor grounds. If you can, check all electrolytic capacitors with an ESR meter, and replace capacitors as needed. Heat sinks will need resoldered tightly to the boards. Start with this and see what happens. There is much to do, with the one board. The next board will be the power supply, and you will have to repeat the effort just mentioned. But, try the first plan and see what happens.

Feb 18, 2011 | Mitsubishi WS-55819 55" Rear Projection...

1 Answer

How do you replace ic chips on Panasonic 52 inch hdtv projection?

Most IC's on circuit boards these days are of the surface mount variety. You will need special Desoldering Equipment to remove these chips, especially the one wth 100 or more pins, the type of equipment used in this process heats all sides of the chip at once while a small suction that grabs the chip for removal. Now the SIP chips (Single inline package). chips which usually consists of less then 20pins can be removed with a desoldering gun such as the HAko 880 desoldering gun. Or you can use a standard soldering iron and solder Wick, that can be found at Radio Shack under Soldering Braide).. These procedures are common for all IC replacement. I am asuming you are trying to remove the Convergence IC on this model, The two large Black one labeled STK-392-110, the correct and easy way to remove these is to remove the entire board from the unit and remove the two screws holdinf each one in place, Unsolder the pins of each one and remove the IC, reverse this process to reinstall them. Good soldering technique is critical here as you don't want to bridge pins together causing yourself more problems. Double check your soldering and Double check it again.

Thanks :

Sep 28, 2009 | Panasonic PT-53WX53 53" Rear Projection...

1 Answer

Convergence with green color.

Your symptoms sound like an intermittent connection on the convergence IC’s.

There are two and sometimes three very large IC’s that control the convergence in a big screen set. They are secured to a very large aluminum heat sink.

There are two ways to repair intermittent connections on the convergence IC’s. I usually remove the board with the convergence IC’s on them and then and solder the connections. The other method is to tilt the circuit board and solder them while still installed in the chassis.

If you remove the board and repair the connections, be careful to remember which connections need to be made when you replace the board. Mitsubishi uses a lettering system, so it should be easy.

If the problem remains after you have made the repair, it is possible that the pins on the IC’s have become loose. In this case the IC’s need to be replaced. I have seen this on several occasions.

If you choose to repair the set yourself, be very careful of the high voltage that can be stored in the capacitors, and CRT’s. This voltage can be as high as 30,000 volts.

I hope this information allows you to resolve this issue.
If I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up) If you cant rate this post with the highest rating, then please comment to this post and I will try to help you further.

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2 Answers

Trying to pull out the board that mounts the STK392-110 convergence parts and resistors but having problems disconnecting the 4 white connection that bridge the two boards together. Also problems with...

I suffered the same challenges. The bridge clips simply snap into place on the board with the convergence parts . To separate the bridge, I simply put a small screwdriver under the clip and gently pryed up close to the base. The spark plug type wire can be removed by wrapping the wire with electrical tape (with the boot moved back ) grasping the wire with needlenose pliers and striking it quickly. They are pretty stubborn,but this worked for me. Hope this helps

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3 Answers

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those are bridge connectors they stay attached to the A board and release from the D board. Just slide a small screw driver under the bridge on the D board side and gently lift up they will pop right off.

Sep 11, 2008 | Televison & Video

1 Answer

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That chassis will usually burn 4 of the 6.8 ohm resistors two will usually be discolored and two wont be. Did you check all the resistors that are 6.8ohm by lifting one side of the resistor out of circuit. Also did you double check the IC pins to insure none are accidently bridged with solder?

May 23, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

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there should be a soldered in fuse in the convergence IC input chain, usually fairly close, if there is an inductor coil in the chain, look for the fuse just upstream of that. Each IC will have a fuse, they look like resistors, but are usually solid color, white, light blue, or light green. Check those for opens.

If you find an open, you can bridge it with a fuse of similar load capability, just to see if the set will power up. If the fuse blows again, look for solder bridges in the IC joints. I know you were careful, but it's really easy to get a bridge, or perhaps overflow the solder to another trace on the board.

In lots of cases, when the IC goes, it takes the fuse with it, and you don't find out until you try to power it up.

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Hello Renee, You have a convergence problem, but you are adjusting the wrong system. You need to adjust the convergence rings first ok You need a dot and crosshatch generator to properly set convergence for this set. Connect the generator set the TV to channel 3 and turn on the generator set it to dots adjusting the convergence try to get the center dot RGB all together and then adjust for the outer edges using the convergence board. the use the crosshatch to adjust convergence along the lines of the crosshatch pattern. Remember use the rings first and the the convergence board adjustments.

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A convergence IC has burned out. If I remember correctly, those Pioneer sets have one huge convergence IC, but that IC only has 5 channels in it so they use another smaller dual STK IC and one half of it is used for the 6th channel and the other half is the vertical output. Look on the convergence board, find the blue convergence jack, identify the blue horizontal channel, follow the traces and replace the IC handling the blue horizontal channel.

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