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Sparks came from the back and screen went blank

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Power board shorted, unplug and seek professional assistance. Sparks are rare these days due to a miriad of safety shunts and fuses.

Posted on Jul 19, 2008

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I have Samsung 46" rear projector TV the TV just went blank


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Sony KP-57WV700


Hi. It seems that the g2 voltage of the picture tube is too high, resulting in a white screen, often with white horizontal lines. The g2 (= second grid) voltage is derived from the flyback high voltage. The voltage divider is mostly integrated in the flyback trafo housing.(including the adjustment knobs). A failure in this divider may lead to this defect. The static you hear may come from sparking in the divider. The flyback trafo is soldered onto the main printed cirrcuit board. Sometimes, one of the pins sits loose in the soldering pads.
Turn on the set and observe for any sparking around the entire flyback circuitry, and, or the flyback trafo itself
The screen turns black after a while, as a too high beamcurrent is detected. The set disables the flyback. Stand-by blinks meaning that there is a fault condition.
Be carefull with the high voltages. The flyback voltage is very high (20-30 Kilovolts !) and may be lethal !!

Jul 02, 2012 | Sony KP-57WV600 57" Rear Projection...

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BELL HOWELL 17462 PROJECTION SET TV SCREEN WENT BLANK


Do you still have sound? Can you see light at the back of the set when the screen is blank -if so the bulb is ok and you've just lost video.

Oct 14, 2009 | Televison & Video

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Screen went almost completely blank. could barely see the picture.


THERE IS NOT MODEL BRAND AND TECHNOLOGY DESCRIPTION.

If this tv is and LCD the black screen is now the answer of a problem in the back light. the problem can be resolved. the worst case scenario is to replace the lamps. is an average repair an estimate could be a good idea.

May 02, 2009 | Televison & Video

1 Answer

I have an old but big (50" i think) SONY TV which was working fine until the day when i heard a little spark coming from the back and the screen went blank! the TV was still on but the screen was...


Please respond to this same post with your model number and I will post a link along with the part number where you can get a new replacement Transformer for a very reasonable price and they will give free tech support so you can Change it yourself.

Jul 13, 2008 | Televison & Video

1 Answer

Tv went blank


Does the timer/stand-by light blink at all? If so, count how many times it does. It will usually be in intervals. If it isn't blinking, and you have nothing on the screen, you might have a problem with the "G" Board, part # A1316499A.


C-Dog

Dec 16, 2007 | Sony KP-61V90 61" Rear Projection...

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Sound stays on & picture goes to blank screen


I do not see any reference on this problem and I even checked with Sony. If you are on a cable box, I suspect that is the problem.

Oct 25, 2007 | Sony KP-43T70 43" Rear Projection...

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