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

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Kp-51hw40 problem hi there tv flashes a couple of times red lines then red screen then shuts off ...led flashes 8 times ...i turn it back on and it lasts for about 15 seconds and repeats problem....thanks alot MIKE

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  • Scott Campbell Nov 09, 2007

    on my projection i get a oscilating surge in the green color on occasian i get a arc snap and a solid green flash then it settles down for awhile and then repeats itself, the red will flash any where from 5-8 times but this flashing will stop if i turn it off and back on.

    what i mean a oscilating is the screen flickers no color bleeding or loss of color strength

  • rescue26 Nov 13, 2007

    i heard silly enough that OUR crt's are going bad (shorting) and if we bang the tv around a little it may go away for awile i was told by our friends at sony "to bad so sad" and my repair guy said sony part only...half a days labor...=500.00 approx...does anyone know the part # for the red crt.....thanks rescu26

  • Txfisherman Nov 14, 2007

    I have the same problem and got in contact with sony and haven't done crap about it... I am seriously thinking about filming myself breaking this piece of crap and putting up on YOUTUBE for comsumers to be ware...

  • toc9498 Nov 16, 2007

    have a Sony KP-51HW40 television. Here is the problem the TV will not come on and then flicker blue then the TV will turn itself off. The red standby light blinks 8 times , then off, then repeats the pattern.
    Can you help me with this? Is it worth fixing? I spent $350 about a year ago having it tuned up and it's been working great.

    Please reply I noticed a few people with the same problem and I couldn't find your reply.





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Your blue tube is shorted unplug blue crt board see if set comes on and stays on!

Posted on Nov 19, 2007


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1 Answer

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

The Problem you are having is a Cathode to Grid Short in the Red CRT,When it Shorts the screen will Go all Bright Red and shut Down,The Best fix Would Be to Replace the Defective CRT (GUN)

Dec 30, 2011 | Sony Televison & Video

1 Answer

My KP-51HW40 clicks off after running for a period. The red power light blinks when it goes off but screen stays dark. When TV is shut off for a while it restarts and runs fine. The "On"...

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.

Nov 05, 2010 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Turn tv on,picture good for 4 seconds,then green curved line like a rainbow all green,then 4 green sequence flashes,picture goes out theN volume continues for 2 seconds then out front red power light then...

This is a set with bad picture tubes-not available except on rebuild basis.

Are you seeing bright green screen and then set shuts off?

Let me know so I can help--8 blinks is AKB error.


Sep 15, 2010 | Sony KP-51HW40 51" Rear Projection...

1 Answer

5 flashing light code,unplug CR board,now 8 flashing light code

If you put the "CR" board back on, the error code will once again be 5 blinks. Your problem is likely the TV's IK blanking circuit. The Kine driver ICs on the CRT sockets boards CR, CB, and CG need replacement along with a few components in the 200 volt supply to the circuit.

Feb 12, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Fix my line problem but red LED flashes five times

Hi Guys, Looks like your advise took care of the problem. I adjusted the power knobs for each of the RGB guns on my Sony 51 inch projection TV. The color looks great and I don't seem to have the blinking indicator light bugging me any more. I will be sure to suggest you folks to anyone with these type of technical questions.


Jan 27, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Turns red then shuts off

the red CRT is shorted . You should be able to get a replacement CRT at the following link.

Sep 27, 2008 | Sony KP-51HW40 51" Rear Projection...

3 Answers

KP-51HW40 Sony 51" Fades to blue screen

The service manual on page 8 shows how to adjust the Red/Blue/Green screen voltages. To get to the adjustment board, take the front speaker grill off (two screws at the bottom left and right) and set it aside. No need to disconnect any wires. Then remove the plywood board with 4 screws that exposes the screen/focus adjustments. The top 3 adjustments are for focus, and you need not mess with these. The bottom 3 adjustments are for Red/Blue/Green screen voltage rough adjustments. My screen showed red lines, so I had to turn the bottom right adjustment with a philips head screwdriver just slightly until the red gun retrace lines where no longer visible.

Aug 26, 2008 | Sony KP-51HW40 51" Rear Projection...

4 Answers

Green flashes then tv turns off

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.

Aug 23, 2008 | Sony KP-51HW40 51" Rear Projection...

1 Answer

KP-51HW40 - Auto shut down problem

I had the same problem. i was told by one of these so-called experts @ fixya that my flyback transformer needed to be replaced (the 8 blinks on the standby was the indicator). but i recently replaced it and im having the same problem. sorry. no advice. good luck.

Jun 18, 2008 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Screen Turns Red and then TV shuts off

you red crt is shorting out.tap the neck of the red crt lightly to try to remove the short.if no go also inspect the neck board.

Oct 22, 2007 | Sony KP-51HW40 51" Rear Projection...

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