Question about Zenith IQB50M90W 50" Rear Projection Television

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Three colors line up on some spots but not others

The left side to the center seems to have the red green and blue lined up, but the right half of the screen has all three colors misaligned. If I use the projector set up to fix the problem, the right side lines up, but then the left side goes out of alignment.

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Re: three colors line up on some spots but not others


Posted on Jan 15, 2008

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The color was off on the tv i took the bottom back off and there was a box with three screws on top and three screws on bottom that adjusted the colors when i turned the top left screw a little the three...

turn the center dial ( for green) down slightly then turn the other two the red and the blue up slightly to get the best screen without a dominate color screen.

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Samsung HCN4727W Rear Projection TV, green screen, audio works

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai2_bing.gif,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
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*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
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bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya

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Color lines out of focus

Best Solution posted on Apr 12, 2008 Asker's Rating 3%20stars_w.png
dc2eb76.jpg MikeNJ1964
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You have a completely different problem. The screen voltage for the blue picture tube is slightly too high on your set. This will put fine lines in the background of the picture, called retrace lines. This is very common and easy to correct. Remove the front speaker cover and the access panel behind it. Look inside and you will see a black box with six controls, each control having a little white glue on it. This is the Focus/Screen block. Three controls are labeled Focus and three are labeled Screen. The screen control in the center is for green but I am not sure if the screen control on the left or right is for blue for your model. With the TV on, set it to VIDEO 1 but do not connect anything to the VIDEO 1 jacks. This will produce a pure dark picture, showing any faint lines in the background. Choose one of the screen controls and increase (turn clockwise) it slightly. If the blue lines do not get brighter it means you are turning the red screen control, so put it back where it was and choose the other screen control. When you find the blue screen control, decrease (turn counter-clockwise) it until just when the blue lines are gone. If you want you can check that the red and green screen controls are set to just below the point where their faint lines are visible. When done, replace the panels and your picture will be back to perfect.
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MikeNJ1964 was exactly right! I have a Sony KP-65WV600 that had horizontal green lines that showed when the picture was darker. I had to remove 3 screws on the right and left side of the tv holding in the speakers...carefully pop out the middle panel from the clips holding it in....remove 4 screws from the cardboard in the middle and remove the cardboard. I then saw the six screws. The adjustment screws were the three below. I turned the middle screw until the lines dissapeared. I tried the left screw and blue lines appeared which I then adjusted away.
THANKS a bunch. SAVED me money!!!

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1 Answer

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Your alignment is off. Go to the set up menu then convergence. hit right and you will be in the convergence menu. select the color that is not in alignment. The green line does not move. if blue and green are lined up the line will be cyan. if red and green are lined up the line will be yellow. when all three are lined up the color will be light. Best of luck!

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Red, bule, green lines do not line up together.

why is my projection tv screwed up on the left side with the color red only i tried to center it and it won't go any further.

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Toshiba TP50H15

You can adjust the lines and make them straight. You can also in the same process, make them line up.
1. With the TV on, press the mute button the remote control so that you have picture but no sound.
2. With remote in one hand (holding it as far from the TV as you can but still be able to reach the TV with your other hand), press and hold the mute button again, with the other hand, using the control panel underneath the screen, press the menu button on the TV set.
You will notice an "S" on the screen on the right hand side about 2/3 from the left, halfway up the screen (If you did this right).
This means you are in service mode.
With the remote, curse right only once and you will have some information displayed in the upper left. The top line is Item, the one underneath is Data.
Press "7." This will display the built in cross hatch pattern. You can move the line around with the directional circle located at the center of the remote. Using the "3" button, you can decide which color to move. To move the curser to a new location, The number pad doubles as a direction key pad. (2-up), (4-left), (6-right), (8-down). To simplify the process, you can eliminate the red or blue or green lines and only focus on one color at a time. "0" will shut on/off the green line. "100 button" will shut on/off the red line. "CH RTN or Enter will shut on/off the blue line.
"7" will exit the process as well as get you there.
Power off when you are done and turn back on.
Repeat as needed.

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3 Answers

Sony kp-65wv700

I followed GuestUser/ Slinteriors advice and I fixed it. Open the front of the TV and there are 6 little nobs in the front. The botton 3 are what you need to adjust. from left to right the color controls are BLUE, RED GREEN. For the blue lines, slightly (I really mean very slightly) turn the botton left nob clockwise (right).

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1 Answer

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I'm trying to fix the issue on my 43FDX20B. So far, I'm able to move the lines up and down, but can't get the left/right motion to fix it. The attached link has the dynamic mode instructions, so you can correct this issue yourself.

The only thing I didn't have was the screen overlay jig the manual talks about. I decided to create one myself and use the screen as a beginning template. I went to our local hardware store and picked up some home window weather covering. The roll cost about $15, is a clear strong plastic and the template was very easy to create. I used a straight edge after I put dots on the plastic and measured the lines for being square and equal after I took it off my tv. Good thing is that if you don't like what you make the first time, you have a 25' roll to use to try again (ha).

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1 Answer

Convergence not lining up

Sounds like the green is out of focus. If the focus control for the green does not control it enough to make the width the same as the red, then, the lens on top of the green can be adjusted to focus that tube. On the lens, there is a wing nut on a screw to loosen it and move the lens left or right a bit to help with the focus. Hope this helps.

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If the CRT Projection television has several colors or one that arent lining up, if due to an impact - you may have a broken mirror, if just happened all by itsself it may be a convergence issue, either issue is repairable, probably for around $400-$500. I dont recommend taking a set like that into the shop as sometimes transport can break/crack a mirror or throw convergence off.

Sep 30, 2006 | Panasonic PT-47WX42 47" Rear Projection...

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