Question about Mitsubishi WS-55809 55" Rear Projection Television

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Mitsubishi WS-55809 installing STK392-570

I have a Mitsubishi WS-55809 and I have convergence issues. I found the part I need is an IC chip STK392-570 but I don't know how to install it. I have zero experience with doing this but I am a pretty technical guy so a quick how-to would be awesome. I don't have to money to pay somebody to replace it and I am getting headaches from watching the tv. Please help!!

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  • cbolitho Dec 10, 2008

    Ok, I have soldered a few things before and it doesn't really seem all that difficult. To unsolder I need a solder braid to head up the old solder and so it attaches itself to the copper of the braid, remove the IC's and replace with new ones and re-solder back on. You mentioned to check the low ohm resisters in same circuit, how would I go about doing that? I don't have a voltometer or anything like that.

  • executivebui Jan 10, 2009

    Hello, I have Mitsubishi WS-55809 installing STK392-570 problem. I can do the solder no problem. However when removing the circut board, how do I know when it is safe ( no electricity in capacitors or transformers) to proceed.? I do not have a degauss tool. I have a cheap multimeter, but where do I test? Or how long after unplug would be absolutely safe? Thanks

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Un solder ics replace both of them resolder make sure you do not solder any of the circuits together or it will short something out,also ck low ohm resistors in same circuit.I will try to help you the best that i can. Main key you must know how to Solder.

Posted on Dec 10, 2008

  • ladywinn
    ladywinn Dec 10, 2008

    you will need to get some heat sink silicon to put onto back of new ics, also just look to see if any of the resistors seem burted. volt/ohm meter do you know anyone that has one/or you can buy one for less then 25.00 they really do come in need for alot of things .resistor values 1.8 ohms 1watt look up color code for resistor values print it .Radio shack use to have a free resistor chart at thier store.If i can be of anymore help just let me know.

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1 Answer

Mitsubishi WS-55809


Most shops will have that chip which is not used in many mitsubishi models----try suburban electronics on the internet----they have all the chips etc and you are looking at 2-3 days for average delivery to California----I know.

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So you are still haveing the convergence issue with your tv, the convergence ic chips need to be replaced to correct this problem you can't adjust it as the components are failing.

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Just changed the convergence chips and now the TV turns right back off


There is a short. Be sure none of the leads on the ic are shorted together.

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I need to replace the convergence chips in my Mitsubishi WS-55809. Could someone send me the instructions to do so, as well as any other need info for this task? Thanks, Jason utilitypigeons@aol.com


There should be a diagram somewehre in the tv set itself. If not, do a diagram search on your model number on your television, and it should show where those chips are.

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You will need to replace the convergence amplifer chips and any related blown resistors, and perhaps two fuses.
Search this site for convergence fixes.

Sep 08, 2009 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

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This issue is almost always caused by a faulty Convergence IC inside your TV. These chips heat up and can become damaged over time. The most common cause I have seen for the picture distortion is the heat of the Convergence IC weakening the solder connection to the TV circuit board. If you look on various messages board you will see people rigging wooden dowels and other items to apply pressure to the chips in order to correct their picture issue. This works because when the solder joint is weakened the chip becomes loose and vibrations or pressure will cause it to work or not work correctly. Aside from all that information the correct fix is to have the IC chips replaces on your TV.

The solutions for this issue are as follows:

1. located a tv repair shop that will replace the parts for you. I had the same issue with my 65" Tv and the quote was $350 for the labor and parts.


2. You can ordered the IC replacements yourself online by going to google and looking up a reseller of the STK392-110 Convergence IC that is inside your model TV. You will need 2 of them and they cost around $6 each. If you have the soldering skills to remove the old chips and install the new ones this is by far the most cost effective route. It is a fairly simple process and guides can be found online.

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REPLACE THE CONVERGENCE I.C.'S AND CHECK THE RESISTORS/FUSES AROUND THE STK'S

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If you know how to solider you can fix this yourself with no new parts.

The convergence chip is becoming desoldered from the board. If you check hometheaterspot.com's Mits forum they have very detailed info on how to fix this.

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1 Answer

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Hi! Truman001;
Check all the peco fuses on the deflection /power pcb.
Please let me know what you find.

Thanks!!

Toprol

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1 Answer

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Proper description is convergence IC ...part # STK392-570...
there are two in model # WS 55809...replace both.......T.

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