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

5 Answers

Red lines on Sony KP51HW40 Rear projection TV

I have KP51HW40 Sony rear projection tv for over 4 years now. I have started to get red lines going across the screen (horizontally in a curve not straight) and then in a while the TV turns all red. I will have to shut the tv down for a min or so and then turn it back on,its all good for a while. Then once again the same problem will come back in few minuts. I will appreciate if anyone has faced similar problems or have any suggestions of fixing this issue. I definitely would not want to spend over $500 to fix this, when the new TV can be purchased for $1000. Thanks

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  • jillbryce Feb 11, 2008

    i've had sony kp-hw40 51 in. since '04. i' ve had the blue horizontal line problem and was able to fix it. now, probably about once or twice a week, my t.v. will start flashing blue and/or changing color on screen to an extreme blue tint....(a few times, it has done this in red) i know if i have anybody come out to look at/fix my t.v. will cost me almost half of what it would cost to buy a new one. i really can't spend this much...any advice on how to fix and where to purchase necessary parts would be appreciated...

  • Anonymous Jan 28, 2009

    I have the same problems. I tried to adjust bottom red knobs inside TV but after few minutes the same prob continues. Please let me know if you find some solution for this problems. My Email Address is

  • finbow37 Apr 20, 2009

    Same problem. I have a Sony rear projection TV (not HD). I get continuous red, arched lines that won't go away. What can that be and how can I get rid of them? I took a photo of can I post the image for you to see?

    Thank you.




5 Answers

It worked took 15 minutes

Posted on Dec 04, 2007


Worked like a charm.... no more lines!!!!

Posted on Nov 23, 2007


This should be a very simple fix. The lines on your screen are call retrace lines. Basically you need to open the TV and the job is about 15 minutes to solve the issue with arched lines, either blue, greed, or red. There is a great how-to guide here:

Posted on Jul 02, 2007

I have the exact same TV model: KP-51HW40 and I am experiencing the same problems. I have already had if fixed twice in the past. This is something you will need an expert to do. Behind the power button in the bottom center of the t.v are some adjusters that adjust the picture of your T.V. Do Not let them get you into replacing anything. It is unecessary. Have them adjust the picture using those switches. They will charge you a minimum labor fee. Usually no more than 60 bucks. It's worth it.

Posted on Jun 02, 2007

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  • 49 Answers

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...

Posted on May 10, 2007

  • marcial  nasi
    marcial nasi May 10, 2007

    try to find a leaky capacitor on main board..
    4 years is enough for the capacitor to start leaking..or even dried up


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SOURCE: Red lines on Sony KP51HW40 Rear projection TV

Before you break down and have the tube repaired, it could be a faulty or mis-adjusted screen setting. These projection TV's have three individual CRT tubes. Each tube has a FOCUS and SCREEN adjustment on a block inside the TV. I have the 57" model of the same series of TV's and just had to do some work on it. If you remove the front panel and the small wooden panel behind that, you should see a block with 6 screw adjustments. On my TV the set on the right was for the red tube. The top screw adjusts focus and the bottom adjusts screen. Focus (as the name implies) makes the screen go in and out of focus. If your TV isn't blurry then don't touch the top knob. The bottom knob is SCREEN. This knob adjusts the brightness (power) of the tube. If this knob is turned up too high, red lines will start to develop across the screen. At first, they'll only be visible when the screen is black, but if you keep turning it up they'll become very visible. If you turn it up even higher the whole screen will become red. Running it at full power (the whole screen being red) will cause an electronic lockdown and shut off the TV (at least it did with the blue tube, I was playing with the knobs and accidentally made it turn all blue then click off. I waited a few minutes, turned the knob down, then turned the TV back on and all was fine again). What you need to do is simply turn down the bottom right knob until the red lines go away. Put the TV on a blank screen (all black, just having it on an unused video input works great) and then slowly turn down the lower right knob (red screen knob) until the lines go away. Then put the TV on a picture to make sure the red is still visible. Finally, turn off the TV and turn it back on and use it for a while (don't put it back together yet, but make sure the front panel buttons and LED's are connected). I had a problem where the TV gave me an error code 5 (AKB error, shown by the Standby light flashing in sets of 5). After some reading and experimenting I found out that it was giving me this because I had set the red TOO low. I turned it up until the lines showed up and then turned it just slightly until the lines just vanished (but no further down) and then reset the TV by going to the system menu (Display, 5, Channel +, POWER while the TV is off) and then pressing 8 then Enter (Factory Reset). If you simply follow my advice (don't turn the knob down any further than necessary, just to the point that the lines don't show) then you shouldn't get the error at all.

Posted on Jun 02, 2009

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