Question about Projection Televisions

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Tv screen looks like an hourglass!! i need set up code for a is-tvhd30

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  • Robert Johnson May 11, 2010

    what is the make and model of this unit?

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This can happen when the power supply is not there, 1 cause is a blown convergence chip or maybe the fuse is just blown, the first is the probible cause.

Posted on May 27, 2010

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If your tv pic looks like & there no black space on the sides your prob will be in the convergence circuits, 99% the IC'S they are mounted on large metal 'het sinks'. The #'s on the IC'S normally start with STK392-110, eg. If black on sides loo into pi cushion or damper circuits. Good luck.

Posted on Apr 02, 2008

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There is malfunction in the horizontal circuit for sure

Posted on Apr 01, 2008

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Your problem is not an adjustment. You will need to change the convergence IC's. What brand and model number is this TV?

Posted on Mar 31, 2008

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1 Answer

Av48wp30 picture is not working. crazy lines all through it with no picture or bowing in an hourglass shape. Could turn off and turn back on after a few minutes but now will not come back.


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. Repair kits with instructions are also avail from www.TvRepairKits.com

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.


7859b01.jpg

e87380c.jpg
69189a5.pngSOLUTION #1

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

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.

578ba6c.jpg
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

Apr 21, 2011 | JVC AV-48WP30 48" Rear Projection...

2 Answers

Sony 53 inch projection screen with hourglass picture


If you are familiar with TV repair, have electronics basic knowledge, good soldering skills and tools then check dry (cold) soldering joints at D board of this TV. Resold all lose connections there and check picture.
Still no joy then you need to replace D board.

Feb 25, 2009 | Philips 60PP9202 60" Rear Projection...

1 Answer

Insignia TVHD30 has picture that pulls in at the sides


HELLO it sound's like you need to set the convergence. on the set.!!! or need to replace the ic chip's on the convergence board. to fix your problum. "good luck"

Nov 25, 2008 | Mitsubishi WS-55859 55" Rear Projection...

2 Answers

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.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
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 www.TvRepairKits.com. 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.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


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

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

1 Answer

Screen looks like hourglass


You have a convergence problem. Most likely the convergence IC's will need to be replaced.

Mar 30, 2008 | Projection Televisions

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

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...

1 Answer

Hourglass screen


Did you check for fuseable resistors open when you changed the chips? This usually happens on a pioneer set . Did you get a manual?? You shount try to fix a set without a service manual. i'll see if I can get the way to do it BUT your still going to need to find those fuseable resistors thats bad. A manual makes it alot easyer. Good Luck

Aug 06, 2006 | Pioneer PRO-200 60" Rear Projection...

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