Question about Zenith IQB50M90W 50" Rear Projection Television

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Help! My picture is a double image and has a sideways hourglass on the screen. Please help me!

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  • d_sharp_22 May 11, 2010

    when we turn the tv on its ok but after two sec it turns green



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Problem would lie on convergence board, usually two big STK ics and resistors

Posted on Nov 20, 2007


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Red sideways hourglass

Your TV most likely has one of two possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • 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.
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.

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.

TV set after fluid change


2c07611.pngSolution #2

What you will need to do is replace the coolant and clean the crt. You can get a repair kit from that includes replacement coolant, photos. instructions, etc.

Jul 20, 2008 | Philips 60PW9363 60" Rear Projection...

1 Answer

PT-47WXC43G-Red and blue look blured picture. Blue looks like sideways hourglass. Red is double image on the sides.

Convergence ICs you need two of them STK392-110 you can get replacement ICs at the following link with free instalation instructions with pictures so you can do the job yourself. Here's the link.

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1 Answer

Zenith 50 In Rear Projection Hour Glass

My picture is a double image and has a sideways hourglass on the screen. Please help me!

Oct 08, 2007 | Zenith IQB50M90W 50" Rear Projection...

1 Answer

Pincushion Problems

check the cap that couple the horizontal transistor, this could be bad replace the flyback.all caps and transistors in that circuit should be cheked.good luck.

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Problem with picture

Call in the tech your tv needs to be repaired you are having problem the tv video ciruit.if it does not have sound it wiil be in the IF circuit.good luck.

Apr 01, 2007 | RCA P52920BL 52" Rear Projection...

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