Question about Mitsubishi VS-60621 60" Rear Projection Television

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I replaced all 3 convergence chips, check every

I replaced all 3 convergence chips, checked every resistor on the board, and the TV still won't power up, what else could I check? This was after it died briefly showing 3 thin color lines, straight with a sawtooth peak in the center, then went black. Several people recommended I change those chips, all solder joints look good, all resistors, caps, diodes, transistors show no signs of heat. The board number is 935C747 with 20 048 (or last digit could be a B) stamped and 012 with mark through 0 and 1234567890 with mark through 7.

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  • zeek865 Sep 30, 2009

    There were 3 thin horizontal lines, one for each color, spaced a few inches apart, each with the same sawtooth peak in the center, like single pulse as seen on an oscilloscope waveform. That held for about 30 seconds, then the picture went black. On what board would I find the parts you've listed, not on the convergence board, I presume? Also, I have no way to test an IC, but I can check caps & resistors for value and an open circuit... Thanks!



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If it had line stright acoss screen thats Vertical IC and Capacitors 100uf 35v ,1uf 50v, 2.2uf 50v Check by hori output Blue capacitor c556 561pf 2kv

Posted on Sep 30, 2009

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  • ladywinn
    ladywinn Oct 01, 2009

    Some sets will shut down if they have a Defective vertical IC,you have 3 tubes so that explains the 3 color lines Vertical failure Also your FBT flyback transfomer can cause vertical to collaspe and then shut down you need to CK your hori out put Transistor see if it is shorted, Thinking you have Bad FBT! Call Mats Electronics for a catolog for Parts 1-800-628-1118 CK on price of hori out put and FBT.


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Sounds like you lost power to the vertical deflection IC. Power is developed off the flyback transformer. There is most likely a fuse resistor, a diode and a capacitor off one of the pins of the flyback. The cap probably failed and took out the fuse resistor and/or diode. Locate these and it will probably fix your problem. Good luck.

Posted on Mar 25, 2010


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First of all, thank you for contacting regarding on your TV problem.

I've suspected a convergence chips failure not the power supply board issue in this kind of symptoms. To confirm it, locate the convergence board inside the set, it has a Sanyo convergence chip STK392-110 that are mounted on the large heat sink. This board has a LED (light emitting diode) that will light up once the board gone to malfunction. Turn on the unit and then check if the LED will lit after the shuts down. If yes, then I would advice you to replaced both convergence Chips and check the resistance of the resistors in line with the +25V and -20V supply of the chips.
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Have a nice day!

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there are fuses on each driver (6 in all) under the heatsinks usually.. make sure these are good. there are also 2 5amp fuses on the g board that supply power to the chips + and - 24volts.. check both of these.. i've seen some check good in circuit and still are bad, check voltage to see for sure. In a rare case, i knocked off a small surface mount resistor when unsoldering the chip, and then the convergence was muted.. make sure no small surface mount parts were moved on the bottom of the board when you soldered. good luck, let me know wif you need futher assistance.

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I have a convergence problem. My Sony KP-65WS510 has a picture that looks like 3-D and bows at the bottom and top of the screen. I already replaced both the IC's STK 392-560 (2 qty.) and check all six 3.5a...

You have a convergence problem. Here are some of the most common symptoms. 
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One or more colors can't be adjusted when using the convergence menu. 
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

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You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. 


You need to replace the convergence chips and convergence resistors. 

Check the site They have put together a kit for your exact model. The kit includes a photo instruction guide, original Sanyo STK chips, convergence resistors, etc. Everything you need to fix it yourself. 

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