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

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Picture Quality I have green lines running across my SONY KP-51HW40 screen. How can I fix it?

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Re: Picture Quality

Without seeing a picture I can guess that you may have a shorted green crt or the drive going to it has changed and you may need to turn down the g2 control for the green. If the tube is shorted or bad see what type of warrantee you have on the crts as some sets have two to 5 years. Good Luck

Posted on Apr 22, 2006

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My Sony KP-51HW40 is flashing a green screen and then going back to the image, then it gets more frequent, and eventually cuts off, i'm guessing it's a heat issue... but where?

Your Green picture tube is arching / Failing. The only way to fix is to remove the tube and ship it to a company that rebuilds tubes, but this would not be cost effective.

Apr 19, 2011 | Sony KP-51HW40 51" Rear Projection...

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What should I do if my tv screen has green lines going across and after a short amount of time will often turn completely green?

These are symptom of defective green picture tube in tv that will be replaced to solve the issue.
It is not user level repair and experienced tech can do that job

Oct 14, 2010 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Sony KP-51HW40 51 in. Rear Projection Horizontal lines

Don't waste your time - go out and get another TV. Chaulk it up to that we have all been scamed by SONY. They knew about the problem, did not choose to make things right. They have become the Fat Cat with the attitude that no one can hurt them. We need to show them that they are wrong and boycot their products. That is the only recourse we have.

Nov 01, 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...

1 Answer


Sounds to me like its your green tube. Kind of expensive replacement, but easy.

Jul 24, 2008 | Sony KP-51HW40 51" Rear Projection...

2 Answers

Kines on Screen and Fading

Open up the front of the set by removing the speaker screen and the black piece of particle board. on the bottom right you will see 4 knobs. Turn those knobs slowly till the arcs go away. The 3 knobs on the bottom are for color. the 3 on top are for the focus.

Jun 30, 2008 | Sony KP-51HW40 51" Rear Projection...

1 Answer


This sounds like you may have bad picture tubes. Most likely the green and red tubes. You would have to have them replaced and realigned. I would call a Sony ASC and get an estimate to verify this. An onsite service call could verify if this is what's causing your problem.

Jan 22, 2008 | Sony KP-51HW40 51" Rear Projection...

1 Answer

No picture..

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.

Dec 12, 2007 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Red and green lines across the screen

classy cuban,
Probable convergence issue....replace convergence IC's

In front of set behind access panel,locate RGB focus and screen
adjust block.....turn red screen control ccw a bit........

m888, Your monitor has a bad CRT.........................T.

Nov 09, 2007 | Sony KP-51HW40 51" Rear Projection...

3 Answers

Sony kp-51hw40

Yes you have bad green and red crt but with an adjustment you can still use it. remove the front panel and you'll see the focus pack (it;s a black piece with 6 rotating knobs on it. Adjust clock otherwise the red and green screen (the bottom line knobs) till the lines has gone. The better way to check it is to adujt in video input with no signal, just black screen.

Nov 06, 2007 | Sony KP-51HW40 51" Rear Projection...

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