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

2 Answers

Sony KP-51HW40 I have started experiencing red lines coming across the screen only when turning on the unit and shutting down. As soon as the picture comes on, the red streak from left to right goes away and then reappears as I turn the unit off. It does not appear to have any problems with the picture while on. I see 4 blinking red lights when turning on. I have performed the auto alignment from the front of the set.

Posted by on

2 Answers

Re: Sony KP-51HW40

It could be retrace lines or according to the service manual, 4 blinks is that the vertical deflection has stopped. A how-to guide on the retrace lines as well as a link to the service manual is here:

Posted on Jul 02, 2007

Re: Sony KP-51HW40

I had the same problem with mine 2 years ago (TV was 1.5 years old at that time) I had extended warranty on TV and it was fixed by Sony at no cost to me. Now yesterday I have another problem with it. All of a sudden screen went BLUE. No Sound either. It could be the CRT (That's what I read here) Out of luck this time. Will call local Repair shop (70 miles away) and see how much it will cost to fix it. Good luck.

Posted on Jun 03, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

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

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

I have a KP-51HW40. Everything works fine but the screen stays blue. What could the problem be?

if blue picture tube is blooming with retrace lines? it's because it developed internal short. you might try to turn down screen on blue picture tube. always mark with fingernail polish so you can return to starting position. J.D.W.

Jun 24, 2010 | 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


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

Kp-51hw40 problem

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

Nov 07, 2007 | Sony KP-51HW40 51" Rear Projection...

5 Answers

Red lines on Sony KP51HW40 Rear projection TV

cold solder on yhe red crt drive.u can find it at the back of red crt try to solder cold joint..or much better if u can refresh all the solder joint. also ,a corrosive terminal of red yoke might also be the culprit. hope this help u...

May 10, 2007 | Sony KP-51HW40 51" Rear Projection...

1 Answer

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

Apr 22, 2006 | Sony KP-51HW40 51" Rear Projection...

Not finding what you are looking for?
Sony KP-51HW40 51" Rear Projection Television Logo

Related Topics:

84 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sony Projection Televisions Experts

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1128 Answers


Level 2 Expert

103 Answers

Jason Harris
Jason Harris

Level 2 Expert

256 Answers

Are you a Sony Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides