Question about Sony KP-51HW40 51" Rear Projection Television

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Screen shakes / jumps vertically on my Sony KP-51HW40

When I turn on the TV, the screen shakes vertically for several hours before settling down. The TV is a 51" Sony rear projection TV model # KP-51HW40. Any help is greatly appreciated.
Thanks,
Marc.

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  • mgtedeschi Feb 13, 2009

    Thank you for your help.

  • Anonymous Apr 01, 2014

    The illustration of the circle Alpaor for this Model

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The jitter is called a vertical sync problem. The problem is on the "A" board. It can be replaced or rebuilt but will be quite expensive to service.

michtech

Posted on Feb 13, 2009

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My Sony big screen rear projection TV model KP=51HW40 produced 2002 screen flashes red then shuts off. We can turn it back on and it will run for 30-60 minutes and then it repeats red flash. Is this


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Hi,
KP-51HW40 shuts off due to incorrect white balance and blue arch lines is an evidence of that incorrect white balance. I hope tv standby red light would flashing 5 times then 3 seconds pause and again 5 times when tv shuts down.
This is rear projection tv that has three picture tubes (red-green-blue) inside to generate picture that projected at front screen. These three picture tubes must be drive with correct drive voltage to produce good picture of each color.
Solution for your tv problem is Screen Voltage adjustment that can be done easily if you are handy with electronics stuff repair.
Let me know your expertise level to guide you more and if you feel unconformable by tv repair then local tv repairman will help you to adjust white balance in tv.
Hope these info will help you.
Let me know if you have additional questions.
Thanks.

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1 Answer

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sounds like you have a bad tube you can attepmt a temporary fix for this problem but is kinda hazardous and does'nt always do any good . but you can remove the front of the tv where the speakers areand tap on the base of the tubes lightly to see if you can get some of the carbon build up loose from inside the tube. also try adjusting the screen voltage for what ever color you see the lines for sometimes turning down the screen voltage can help

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probably contamination in the picture tubes is a lengthy job to change the fluid in all three tubes is also costly. probably as well off to purchase new set.

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or a new lamp. you could first replace the lamp.
the screen might work fine for a couple of seconds, but then it fades away or deteriorates. This means the lamp is going bad.

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hello,,,,,
Picture mute is activated ,it can be vertical amp faulty or one of the c.r.t drive faulty,therefore the mute circuit is active.Increase G2 voltage for the any of the three c.r.t and notice screen .Vertical amp is faultry than you will see horizontal line across the screen and if you see full screen with flyback lines ,means c.r.t drive is having fault.isolate one by one c.r.t drive.
Gopali

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