Question about Zenith IQB50M90W 50" Rear Projection Television

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Zenith 50 In Rear Projection Hour Glass

I have a Zenith Rear Projection tv. The Picture is good but there is a sideways hourglass on the screen. Can you tell me what causes this and how I can fix it.

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

Posted on Nov 14, 2007


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1 Answer

Zenith 50 in RPTV Hourglass

tried to re seat the connectors in the convergence circuit, if can not get get with reset check if their is a burnt resistor near the convergence ic.

May 23, 2013 | Televison & Video

1 Answer

Just recently my GE 46GW 948 46 in. Rear Projection Television when turned on goes from a good picture to an hour glass shape and an almost 3d like picture.When I turn it off then on I get a good picture...

Sounds like a loose solder connection on the Convergence board or the convergence power board. If you are savvy and electrically safe, tap on the boards with an insulated screwdriver to see which has the loose connection, and you can resolder to fix. Repair from a service center = $150-300

Jul 26, 2010 | GE 46GW 948 46" Rear Projection Television

1 Answer

Hourglass Shape

If there is a hour glass shape to the image but convergence is normal, there are 2 possibilities. You either have a pincushion correction problem or if the hour glass seems to be moving, it will be an open filter capacitor in the power supply.

Unless you are electronically inclined troubleshooting this issue will require a factory trained service technician. You can expect to spend $300-$400 to fix this.

Feb 17, 2009 | Philips 60PP9202 60" Rear Projection...

1 Answer

Magnavox 51mp392h

replace the convergence ICs STK392-120 you will need both of them also check the 6.8 ohm resistors right next to the ICs as often 1 or 2 of them burn open. You should be able to notice the discoloration in the center of the resistors.

Mar 11, 2008 | Philips 60PP9202 60" Rear Projection...

1 Answer


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

Nov 14, 2007 | Zenith IQB50M90W 50" Rear Projection...

1 Answer

Tv picture shaped like hour glass

The link you posted has been deleted, so I cannot see the picture you posted. If the sides bow in like an hourglass and the red, green and blue colors are still aligned then there is a horizontal width or pincussion problem, but if the sides bow in and the 3 colors have separated and are no longer anywhere near aligned then you have a convergence problem, both of which should be serviced by someone with experience in servicing projection TV's.

Jul 03, 2007 | Akai PT4298HD Rear Projection Television

1 Answer

Rear projection has sound no picture

impossible to tell with just this information,have seen bulb cause no picture with these,usually if you remove it is easy to check as will have broken glass as the lamp pops.

May 13, 2007 | Zenith IQC50H95W 50" Rear Projection...

2 Answers

Zenith 46" with a "hour-glass" picture.

If the hour glass figure is a seperation of colors that appear to be convegence mis aligned, then, the convergence ICs would be the problem. If the picture is clear and you have a bending on the sides then the pincusion circuit in the horizontal circuit is where to look. Be careful of this circuit, it does control the high voltage. The only way to have a board checked is to have an Authorized Service Center look at it. It does, however, sound like there is a cold solder joint in the power supply that has gradually opened up and now is permanantly open. Call Zenith (LG) to see who they recommend.

Mar 25, 2007 | Zenith Z46Z83D 46" Rear Projection...

1 Answer

Bowing in the middle like an hour glass

OUCH!!!! Don't kick me...would be my response if I were your TV
Convergence amps problem.

If it works after a kick I'd say poor solder joints on the convergence amp leads

Dec 17, 2006 | Zenith IQB50M90W 50" Rear Projection...

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