Question about Mitsubishi WS-65411 65" Rear Projection Television

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Red Green Blue horizontal line at top of screen

I have replaced the convergence and vertical output ICs in this set because it was powering off. The set now works fine and looks pretty good with the exception of having 1 each of a red green and blue horizontal line in the topmost portion of the screen. I'm guessing that there is something in the vertical output circuits causing this, but am pretty clueless as to where to look now. Note that all the electrolytic caps associated with the vertical output IC were also replaced.

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  • Mopela Feb 07, 2008

    Mr Bob,

    Thanks for responding.

    Well, actually the convergence ICs have been replaced again since then and the problem remains. Also, I have tried vertical height and the lines remain (they do move with the height adjustment).

    I have also tried the vertical sawtooth adjustments to no avail.

    Mike

  • Mopela Feb 07, 2008

    The lines are separate, and bowed (this leads me not to suspect the convergence ICs themselves since I would think the lines would not be separate and not with a pronounced bow to them). The picture looks fine (very linear and convergence is fine)except for these three lines.

    The reason I replaced the output IC was because after originally replacing the convergence ICs I continued to have a problem with the set shutting off (vertical height would vary until the set ended up turning off). Unfortunately, I replaced the convergence and output ICs this time.

    Neither of the 24v fuses ever blew.

    I have no idea what might affect this in the sm. I have tried VHGT, VCNT, VSTR and VOFS to no avail. Any suggestions as to what else to try in the sm?

  • Mopela Feb 07, 2008

    Bob,

    I'd hate to use up anymore of your time right now. I am going to replace the output IC again and see if this helps first. (I do have good reasons for trying this, which would take too much to detail here). I'll contact you off list though to detail it a bit more.

    Thanks again - Mike

  • Mopela Feb 15, 2008

    I finally got around to replacing the vertical output IC again and this fixed the problem. I must have gotten a bad one originally!

    Thanks to Mr Bob for his help also!


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Since both were replaced at one time, you now can't limit the problem properly. Should have been done one at a time.

Your vert height may be too short, causing you to be seeing things that should be off screen.

This can be remedied in the service mode.


Mr Bob

Posted on Feb 07, 2008

  • Robert Jones
    Robert Jones Feb 07, 2008

    Are the lines separate? Or do they form 1 white line?



    If separate, more work in the sm may be needed.



    Is the pic squinched up at all? If so the vert IC may need to be replaced again -



    I never see this kind of thing when I just replace the conv ICs. The vertical IC on these HDreadys rarely need attention, I would not have replaced it, esp. if I had found either of the 5A conv rail fuses blown - plus and minus 24v.

  • Robert Jones
    Robert Jones Feb 07, 2008

    This is turning into a more complex question. I am available for phone consulation if you wish, and we'll wrestle this to the ground together. Contact me directly.





    Mr Bob

    www.imageperfection.com

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Convergence is bad on left side...good on right.....where convergence is good the picture is great


Hi,
Re-solder convergence output ICs pins and nearby big resistors that might solve your tv picture problem and if that does not help then replace both convergence output ICs to fix the problem.
Convergence output ICs would be available in local repair parts shop or google it.
Thanks.

Feb 25, 2011 | Sony KP-65WV700 65" Rear Projection HDTV

Tip

Convergence - diagnosing a convergence problem - bowed picture/rainbow...


Convergence = the joining together of the 3 colors making up the picture cd3c9b5.jpg
Here is a picture of a Convergence mis-alignment

Typical repair:
Replace both convergence ICs + any burnt up resistors + any blown fuses = repair cost $250-350 or repair it yourself for about $30 and a few hours of time. Repairing requires tools, soldering and disassembly skills.

Overview:
All CRT rear projections have 3 picture tubes - red, green, and blue.
Each picture tube has an electromagnet (yoke) that pulls the beams horizontally or vertically. Therefore, there are 6 convergence amplifiers. One for each color, vertical and horizontal. Any one of these amps can fail independently, or whole sections can fail. Depending on the design of the TV, almost all use an IC (integrated circuit or "chip"). These have a part number beginning with STK (ie stk392-110 most common *see pic below) and run very hot, and fail regularly (5-8 years). Most STK designs have 3 amps per IC, giving you 2 ICs to run the convergence. Many manufacturers will have all 3 vertical amps on one, horizontal on the other. Others will have both the red amps on one, the blue on the other, and the green will be split between the two ICs.

Diagnosing:
The best way to diagnose is to enter the convergence alignment for your TV. Some TV's will have an auto alignment, others will let you adjust the colors yourself. The auto align is hard to troubleshoot because you cannot tell which will not move. If auto align does not work, you have some sort of failure or malfunction. In a manual alignment, you can see which colors will move and in which directions (vertical or horizontal). Using this deduction, you can see which amps have failed and replace accordingly. Red and Blue are typically adjustable, while green is left to factory alignment and not user adjustable. Try looking at the picture with something familiar on the screen. Try to have words or letters around the edges. You can usually see which colors are straight and where they belong, and which colors are out of place. If every color is off in both directions, this is a good indication that there is no power at all. The amps run off + and - 24 volts, and usually have 2 fuses for each power supply line. If everything is off, these fuses probably blew when one or both of the ICs shorted out. *RCA customers see below* Each convergence amp has some resistors that set up the amplifiers gain. Typically and input resistor (small like 1.5 ohm 1 watt) and a feedback resistor (larger like 150 ohm). Its quite common for the smaller value input resistors to blow out, so check them before you replace everything. They are typically right by the ICs (largest heatsinks in the tv) and most of them you can see if they're burnt up. Unhook the yokes (mark them if unmarked) and then you can OHM out the resistors to see if they are opened up. Replace any possibly bad resistors, sometimes they check good but look damaged = replace them! Some TVs will just be dead or go into shutdown. If the + or - 24volt fuses are blown, suspect the ICs and replace them both.

Repairing:
This is kind of tricky, as these ICs usually have 18 pins on each of them. Find all your bad parts, remove them and replace with good ones. The fuses and resistors are pretty straight forward. The ICs are harder. They are mounted to the heatsinks and depending on the make and model, they can be hard to get out. They are thermally bonded to the heatsink with heat sink compound or paste. If it is dry, replace the paste with new stuff. Make sure to get a nice, even, and thin layer on there to give a good heat transfer. The trick to the ICs is to make sure all your pins are straight before you install them. Start at one end and slowly work the IC and get each pin to pop into the hole. Once you solder in all the bad parts, the TV should be able to kick back on and run. At this point, its good to center the colors up in the customer mode. If you want to take it further, get the service manual for that TV and go into service mode and do the full re-alignment. This can backfire so get the manual or make sure you know what your doing as you might accidentally erase all the data.

cb47ab9.jpg
*stk392-110 = the most common IC. Almost all look just like this

Convergence is a very common failure and can be repaired by someone with a little soldering know how and some time to dedicate. Its quite complex, and every make and model are different. Let me know if you have any specific questions for your product and I can help you get the job done. Remember to have patience, good luck!

*RCA typically uses no ICs, and the convergence power board blows out (older models - wood cabinet) OR a small fuse blows out because of solder connections on the flyback transformer (newer models - plastic cabinet) and just needs resoldering and a new fuse.

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1 Answer

Everything looks like its in 3D vision. Im pretty sure somthing isnt alined right so i was wondering what i can do to fix it.


Replace convergence output ICs in your tv to fix this 3D look picture, it happens due to convergence output chips failure.
Local tv repairman will fix it for you if you have no prior experience of part replacement in tv circuit board with proper tools.

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