Question about Mitsubishi WS-65809 65" Rear Projection Television

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Concave picture. Where in the TV I locate the IC STKs, That I may removed them and resolder them.

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If you remove speaker grill in the front you will see a wood board in the center(six screws) take it off and you will see 3 picture tubes and in the back you will see 3 boards.the center board is the one that you are looking for.You wll see big metal heatsink in the center and underneath the ics you are looking for. you would need to work from the back there is in not much you can do from the front.( make sure tv is unpluge before doing anything.
hdtvman..

Posted on Jul 01, 2008

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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.

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If this Tv is a model year 1996 or 1998, It is quite possible your vertical IC needs resoldered. It is located on the small signal board. This board [quite large anyway] is the board on the left. I don't know the location off hand. The IC has seven pins and located on a heatsink, It is a TDA series. Resolder any and all grounds you see. May as well get the Large Signal board [On the right] resoldered. The other problem would be the P I P board, a small board standing up, that can be removed and replaced. But try the earlier first. This is tedious, but will produce results.

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1 Answer

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Hello bigdog730197,

I posted this in an eariler solution and there are numerous references to this type of problem on fixya.com, however it fits in this case, so here it is:

This denotes a convergence problem. Believe it or not it would be cheaper for you to replace the two convergence amplifiers and the biasing resistors. You would not actually be replacing the convergence board since these devices are usually located on the deflection board in most cases. However in answer to your question, the boards are easily removed, depending on your level of patience (lots of cables to move around), I would also advise you to either mark down all of the connection you will remove, or take pictures of the board and its connectors. If you choose to just replace the Amplifiers and the biasing resistors there is a lot of information on this site on how to do so: This will get you started:

1) Unplug the TV and then get a schematic of the TV I use http://www.servicemanuals.net or http://www.manualsparadise.com
2) On the schematic locate the STK392-xxx series IC packs (usually attached to a large heat sink)
3) determine if the STK392s are 110, 120 or 150.
4) if the STK392-xxx's are 110s replace with 110s (forget that upgrade stuff it is a hit or miss game that I don't believe you want to get into), if they are 120s replace with 120s and so on.
5)Now to replace the STKs: remove the module from the TV and unsolder theold STKs along with the bias resistors, and replace them with the newones (be sure to apply heat sink paste to the STKs when attaching them to the heatsink)
6) make sure there are no short circuits form your soldering job.
7) Reinstall the module and then turn on the TV.
8) do manual adjustment and the auto-convergence test and then things should be back to normal.


I hope this helps

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 08, 2009 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Colours serparated, not converged, screen looks concave


Replace Both fo your STKs convergence ICs STK392-040s. For Parts Call 1-800-223-3205

Dec 30, 2008 | Samsung HC-P4741W 47" Rear Projection...

1 Answer

Should i have this fixed or buy a new tv?


OK LOOK IN YOU STK RESOLD YOU IC STK AND BE FIX

Dec 29, 2008 | Sony KP-46WT520 46" Rear Projection...

2 Answers

51mp392h/17


You need to replace your STKs Big black ICs 392-020 replace both of them also check 2 resistors 2,7 ohms they may be open.this is a common repair iob.

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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

Convengence problem?


the stk ic . the big amp chip has cold solder joints . resolder the ic

Nov 30, 2007 | Mitsubishi WS-55857 55" Rear Projection...

1 Answer

No picture, but red light on front comes on


If one your convergence IC's is bad then you will still see a picture but the colors will not line up, especially around the edges. I have never seen a Toshiba projection set completely lose the picture because of a defective convergence IC. If your vertical output IC has failed or cracked loose then that is exactly what you will see - no picture! The vertical output IC is usually on the same board as the convergence outputs which explains why it worked last time, even if the tech was not 100 percent accurate in knowing exactly what was wrong - he just changed everything. Resolder that vertical output IC and make sure it is getting power. If you still have no picture after that then have a qualified tech look at the set.

Jul 12, 2007 | Toshiba 46H84 46" Rear Projection...

1 Answer

Rear projection tv


This sounds like the solder joints have cracked on one of the convergence IC's or the IC itself has gone bad. First determine which color has shifted inward on the left side (let's say red)and then find which output IC is labeled with that color and an H (RH) and resolder or replace that IC.

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