Question about Projection Televisions

1 Answer

Mitsubishi ws-65809 concave picture

You wrote a solution as follows:
The soldering comes loose on the STK ICs in Mits's, sometimes actually coming loose INSIDE the IC, where it solders in there! Heat/cold over and over translates into expand/contract over and over.

Just resoldering the legs usually does the trick, but if you have continued to use your set while hurt, the ICs will eventually go out completely and need replacement. Resoldering them in before that time usually saves the ICs and never needs to be done again.

My questions is where are these STK ICs? What do they look like? What tis the soldering process?

Thanks,
Edog

Posted by on

  • Edog2008 Jun 11, 2008

    Left Board



    Center & Right Board



    Right Board

  • Edog2008 Jun 12, 2008

    Mr. Bob,



    I'm not sure if the text went through with the pictures. I was trying to do as you instructed, but couldn't find the ICs. I took three pictures in hopes of sending them to you for identification of the location of these STK ICs.



    Thanks,

    Edog

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 90 Answers

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

Posted on May 26, 2008

  • Robert Jones
    Robert Jones Jun 13, 2008

    They are/it is mounted to the biggest sink on the center board.



    I believe the xxx09 series uses the STK 393-110, which is the all in one chip, with all 6 channels on it.



    Soldering is touching the soldering iron to the legs of the IC and adding solder or using a solder ****** on it for removal of the solder. You can gtet one cheap at Radio Shack. Many times the guys behind the counter are aspiring DIYers, and can let you in on hints about how to do it right. If you want a full course on it, you can always sign up for a coaching session with me.



    Use a wet sponge to be sure and get the tip of the soldering iron clean and to cool it to the proper temp for each soldering op.



    Be sure and be generous with the heat sink compound when replacing ICs mounted to heat sinks, getting all old, dried out compound outa there before installing the new. If it's still supple and basically wet, you can use what's already there. If there's any question in your mind, just scrape it off with a putty knife and replace it with new compound.





    Mr Bob

    www.imageperfection.com

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

SCREEN HAS VARIES RED -BLUE-WHITE- LINE SHOWING, I TRIED USE THE


It needs to be repaired by having the convergence ICs replaced or resoldered (if intermittent).

Parts are STK 392-570. Be sure to use thermal paste on the ICs.

Jul 02, 2010 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Vertical picture comes on then shrinks up at center of screen, both top and bottom, after a minute or so. Sometimes will lock in and work till I shut it back off. What does it need & is it worth...


You need to resolder Power supply board and convergence ICs these sets are well known for Poor Solder connections resolder vertical IC also.
Solder all pinns on the FBT flyback Transfomer.

Apr 08, 2010 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Mits WS-65857 no HD after repair


WELL YOUR LIQUID SPILL MAY HAVE BURNT FOIL PATHS OR EATEN UP SOME OTHER SOLDER JOINTS. A CLOSER INSPECTION ON THE AREA INVOLVED SHOULD SOLVE YOUR PROBLEMS.

Dec 27, 2009 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Picture appears concave and shrunken and pulses in size


Replace Both of your STK convergence ICs STK392-570 If this is not number on your s use what it has on them. you can call MATs 1-800-628-1118 o Main STK is what is going bad when IC goes out all together TV will shut down and will not come on. So replace BOTH STKs ASAP! you will also need Heat sink compound to put on back of New ICs.

Aug 19, 2009 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

Mitsubishi Rear Projection 65" tv picture becomes blurred bouncing right to left and color is red & green. TV is 8 years old approx. Any suggestions. Have not had any problems prevoiusly. First it woudl...


Sounds like possible solder connections on the convergence ICs. If so, you will see the red, green, and blue not lining up on ever input and even the mits menu. If you can bump it to correct, its just a solder connection, but if its out all the time then the ICs need replaced. This is a difficult repair only recommended for skilled technicians (40 solder connections + possible re-alignment needed)

Dec 03, 2008 | Mitsubishi WS-65809 65" Rear Projection...

2 Answers

STK IC info


the convergance amplifiers are STK392-570 there are two of them they both must be replaced they are located on the power board. they are on the lagest heat sink on that board. yes, they need to be soldered to the board. they look like this:
70a4bc9.jpgthere also may be some resistors and fuses that failed. if you are not a tech do not attempt this repair if you do you may end up with further issues or dammage to you or the set.

May 25, 2008 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Mitsubishi TV problem ws-65809 Concave Screen Fix


No, but I do paid phone coaching for such things. Contact me directly and I'll steer you past the dangers and in all the right directions.


Mr Bob
www.imageperfection.com

May 20, 2008 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

WS-65809-Picture caves in at times


if it caves in INTERMITTENTLY and you have a 3d effect you may have problem with convergence. you would need to resolder or replace convergence ics. STK392-570.
you would need to have some king od skill soldering and unsoldering parts.let me know if you need more info.
hdtvman.

Apr 11, 2008 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Mitsubishi WS-65809 65 in. Rear Projector


Bad solder connects on pins of STK convergence IC's.Replace IC's for reliability,then re-align if necessary.

Oct 04, 2007 | Mitsubishi WS-65809 65" Rear Projection...

Not finding what you are looking for?

Open Questions:

Projection Televisions Logo

Related Topics:

1,092 people viewed this question

Ask a Question

Usually answered in minutes!

Top Projection Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers

matt martin
matt martin

Level 3 Expert

1191 Answers

yadayada
yadayada

Level 3 Expert

60867 Answers

Are you a Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...