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Colored lines in my projection tv

Hi, I took the front panel off my projection tv and when I put it back on the picture has lines (horizontal and swirling across and downward) going across the picture. I thought wires were on the lenses but the lenses are clean and so is the screen. These lines do change color according to adjusting the color but I cannot figure out where they are coming from.

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Re: colored lines in my projection tv

My cousin had the same problem. He had to call a repair man. Apparently there are some adjustments to fix this problem. He said it only took the guy about 15 minutes and done.

Posted on Jan 12, 2008

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Samsung HDTV model HCL4715w1 has horizontal wavy lines in the middle of the screen. Is it worth Fixing? Any solutions to this problem?

Yes,tv screen have R,G,B colors lines mis alingnments,have colors shaded pictures or 3D pictures look aike?Tv have a problems known as convergence pictures problems.The tv convergence board it is dead.This convergence board must require replacement of 2 STK convergence ICS and some or all of it resistors too.Fixed the tv convergence board to solved the tv convergence pictures problems.U have some mechanical skills like take things aparts and putting it back together again?Yes,try website like to buy a whole refurbish tv convergence board for the replacement.The DLP tvs brands names Samsung and Akai used the same tv convergence board.Or tries those tvs shops will cost u like $300-$350 for parts and labors.

Jun 28, 2011 | Samsung HCL4715W 47" Rear Projection...

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I have a sony rear projection tv that went on then off rite a way the red lite blinked 7 times i took the front panel off and adjusted the 6 color tuners and the tv stays on but there is a blue 3d look ...

7 blinks means High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.

Mar 08, 2011 | Sony KP-51WS500 51" Rear Projection...

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One horizontal line center on the screen

The vertical deflection circuit has failed, or has been shut down by a service code entered from the remote control*. Usually you can get out of service mode by turning the set off and on again.

*Normally, you have to enter a special combination of front panel and remote control codes to get into service mode, then enter another code on the remote control to get the horizontal line. The horizontal line is used for adjusting the screen controls for each color so you get proper color in the dark areas of the picture.

Oct 27, 2010 | Sony KP-46WT510 46" Rear Projection HDTV

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The brightness is very dark. Any nightime scene

Your CRT's getting old. Plus dust on lenses don't help much. You have to open front frill (below screen) and back of the TV. Clean up lenses using dry paper towels, do not wet.
In front of the TV after grill remove center cover and locate "black box" that have 6 potentiometers on it that looks like plastic adjustment screws for philips #2 screwdriver slots. 3 of them should read "Focus" These you don't touch. Another 3 reads "Screen". Put some still image on your screen (like paused DVD movie frame). Carefully add brightness in all 3 colors trying to avoid horizontal lines appearance. If lines show up, just turn it back a little. Try to keep color balance looking at the picture.
This procedure will brighten up image but further reduce CRT's life.

In case that you posted wrong model here and you have DLP Projection TV - just replace the lamp.

Mar 09, 2010 | Pioneer SD-643HD5 64" Rear Projection...

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Green horizontal lines on screen no picture

The green CRT's (color picutre tube or color wheel, or ballast) will need to be tested for replacement.
It is quite common with these tv's

You will need an ohmmeter and or voltmeter and test each component for currency and accuracy

May 06, 2009 | Mitsubishi WD-52525 52" Rear Projection...

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Red & green lamps shutting off leaving a blue screen

Could you show a picture of the distended cover you mentioned?


Were the light blue lines you were referring to, diagonal, or truly horizontal?

Oct 15, 2007 | Sony KP-57WS500 57" Rear Projection...

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Black horizontal lines appear after tv is on for 30 minutes


I had the same problem with our VS-55705 Mitsubishi. It seemed to me that this was a problem of heat.

I unplugged the TV and then took the cover off of the back of the it. I then used canned air to blow off the collection of dust from the components. Then I vacuumed as close to everything as I could without touching any of the components. I then used glass cleaner to clean up the surface of the three bulbs.

I plugged in the TV and it has worked perfect ever since. I haven't put the rear cover back on it yet. That could have been all that I needed to do to fix it. I'm too busy enjoying a nice picture to try putting it back on. Cleaning the bulbs really helped the quality of the picture.

Good Luck!

Oct 11, 2007 | Mitsubishi VS-55705 55" Rear Projection...

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Very fine red lines across srceen

It is an adjustment, but it's an adjustment you may not want to do. It's the red screen control. It's located behind the front panel so the entire front panel has to be removed in order to access it-which will expose you to hazardous voltages. if you like, I can post detailed instructions on how to get that front panel off, it's kinda tricky.

Jun 13, 2007 | Sony KP-51WS500 51" Rear Projection...

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