Question about Zenith IQC50H94W 50" Rear Projection Television

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I have a Zenith Projection 50" TV IQC50H94W that has a blue arc

Our TV has a Blue arc on the bottom of the screen that you can see when its in video mode. On regular channels you see blue also. I tried to align the lines up but it won't move. It seems if we leave the TV on for a few days it will work for awhile but then will go away again. My son tried hitting it a few times and it worked for awhile but then the blue came back again.

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  • Anonymous Feb 28, 2009

    I also have a blue arc...very annoying. Tried taking apart the tv, which did sharpen the picture once I cleaned off the projection lamps and screen, but could not find the problem of the blue arc - I have no idea what a stk 392-iso is, so that is a little out of my league. Also, our menu button for the tv no longer works and we cannot find a code that works for the universal remote to access it that way!

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You need to replace your STK392-150 I.C.'s, Also, check all of the large nearby resistors, make sure none are burned, and remember, you have to check the resistance out of circuit with a meter.

once the resistors are checked, and the convergence I.C.'s replaced, you should be able to converge the picture through the user menu.

Posted on Dec 18, 2008

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I am unable to adjust the red color in the convergence adjustment on my IQC50H94W 2000 Zenith 50". From everything I read I believe I need to replace my Convergence IC Chips, however I am not 100%...


Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from www.TvRepairKits.com and do the repair yourself. Its a fairly easy DIY fix.

Jul 24, 2011 | Zenith IQC50H94W 50" Rear Projection...

1 Answer

The picture is all meessed up. blury and really most of the time green other times its really red . some of the stuff looks like it is doubled.


projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.

Common Problem #1) Convergence has gone out

Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.


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Common Problem #2) CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

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TV set after fluid change

65af323.jpg

69189a5.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Jan 12, 2011 | Zenith IQC50H94W 50" Rear Projection...

1 Answer

My IQC50H94W Zenith projection TV has double vision...


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,Akai,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
*Colors wont align
*Screen may look distorted or warped
*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
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Feb 02, 2009 | Zenith IQC60H95W 60" Rear Projection...

1 Answer

Toshiba 50H81 projection television


Projection sets have two very common problems.

The first common problem is convergence


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,Akai,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...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*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
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Oct 22, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

Toshiba 50H82 blue arcing?


color shadows on numbers or letters indicate a possible convergence problem.. might be a crt deflection problem.

Dec 18, 2007 | Toshiba 50H82 50" Rear Projection...

1 Answer

Zenith IQC50H94W Color Loss


check the 180 volts that is the supply of the CRT Grid.

Oct 03, 2007 | Zenith IQC50H94W 50" Rear Projection...

1 Answer

Zenith blue corners


CALL ZENITH AND PROVIDE SERIAL NUMBER AND PROOF OF PURCHASE. THEY WILL SEND TECH OUT TO FIX OR REPLACE TV. THIS IS A PROBLEM WITH MANY PROJECTION TV'S BECAUSE OF A FAULTY PART.

Sep 02, 2007 | Zenith D60WLCD 60" Rear Projection...

1 Answer

Zenith IQC50H94W will not power up


First off, check Q655,EP98,and D756. If they all check good it may take a service manual to troubleshoot this set which is based on the Hitachi DP-05 chassis and is similar to their model 53FDX01B.

Jan 24, 2007 | Zenith IQC50H94W 50" Rear Projection...

2 Answers

IQC50H94W Zenith Projection tv


check the flyback/hv-spliter sounds like it could be your problem also check horizontal ic

Jan 23, 2007 | Zenith IQC50H95W 50" Rear Projection...

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