Question about Sony KP-48S35 48" Rear Projection Television

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Sony KP-48S35 Picture

Picture is "bowed in" on all 4 sides.

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  • gast9406 Jul 13, 2008

    The picture on my Sony KP-48S35 rear projection TV is ''bowed on all 4 sides when I first turn it on and then corrects after about 10 minutes of playing. Is something about to go bad on it?

  • gast9406 Jul 20, 2008

    Thank you for your answer. I'm pretty sure you're right about the failing solder joint because when I pulled the unit away from the wall, it corrected itself. I then was able to bump it on the side and it would correct. Now, however, that doesn't work any longer. Would you please give some advice as to where this circuit is and as you said, thhe most likely capasitors? Any assistance you can give will be greatly appreciated. Thanks again.

    gast9406

  • gast9406 Jul 26, 2008

    Well, I looked where you told me to look and found exactly what you predicted I would find...a bad solder joint on a resistor. I reflowed the solder and the picture has never been better. You guys are either genius or psychic. Thank you very much. I'm sure you saved me hundreds of dollars on a repair or a new TV. You are truly a guru.



    Gary

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I repaired a bad solder joint on a resistor near one of the IC STK392-XXX. It was exactly as you suggested it would be. Thank you very much. You are truly a guru.

Posted on Jul 26, 2008

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Dear customer

It MIGHT be something you can adjust, but probably NOT. If you own a Sony there is a small hole on the back panel, with a tiny push-button switch within, then your set has a remote service mode.

If you press and hold the button, then turn on the set, it will come up in service mode. " ...
... Did you try UNplugging the set for 2-3 minutes? That might de-magnitize the tube. Make sure there are NO motors or electrical stuff around the set.
The 'expert' site says: "...The pincushion effect you saw worries me, too. But it is too unlikely the convergence board is gone as well. You can get a pincushion effect when the high voltage dies down, but you should also have seen the image on the screen become dim due to lack of accelerating voltage. So, I am going to stick with my prediction that the problem is in the main power supply section that is feeding the deflection amplifiers. Further, I am going to predict it to be an electrolytic filter capacitor that has shorted down the B+ line..." etc


U have to change the convergence board.
thank u

Posted on Jul 14, 2008

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I would suggest to try to locate the ICs STK392-XXX and inspect the solder joints for crystallized conditions using a 2X or 4X magnification aid. Also you should check the resistors nearby the ICs for the same condition.
Let me know if you need further assistance.

Posted on Jul 14, 2008

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Since this recovers on its own, there are a few possibilities:

1) There are bad connections on the board that self-correct as the unit heats up a bit.

2) There are capacitors in the convergence and pincushion circuits that are starting to fail.

If you can solder, you can repair this yourself. First look for poor solder connections that appear to be grainy or have rings and resolder them. If that fails to resolve the problem, we next have to look for failing capacitors. I will look up the most probable caps in both circuits and post the circuit designations here.

Keep up posted on your progress.

Dan

Posted on Jul 14, 2008

  • ABRsvcs Jul 21, 2008

    I don't know hte layout of the board inside your model, so I can;t direct you to the specific point to resolder. But... Look at all of the solder joints on the board and resolder any of them that appear to be grainy or have rings. Usually when a joint goes bad, it develops a ring that looks like a circular crack.



    Keep us posted.

    Dan

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