Question about Zenith IQC50H94W 50" Rear Projection Television

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Zenith IQC50H94W Color Loss

Experiencing color issues. Took the back off to find the blue tube not working. Is it worth replacing and if so, where do I find a tube? The TV was free, so because of this so I have no problem tossing it.

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Re: Zenith IQC50H94W Color Loss

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

Posted on Oct 03, 2007

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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 and do the repair yourself. Its a fairly easy DIY fix.

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My projection tv lost its blue tint


Thanks for using FixYa. Usually this happens when the Light Engine has gone bad, and I should say this is a common issue with Projection TVs. There are three tubes/mini LCDs inside your TV- green/yellow, blue and red. When the set heats up over time of usage the screens tend to break resulting in leaking color everywhere. The cost to get this fixed by a professional should be around $300 depending on the parts that needs to be replaced. Please do accept the solution if the issue is resolved or else revert for further assistance.


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1 Answer

Blue escreen

Call LG they bought zenith and there is a class action suit so you can get a replacement or repair refund from LG

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My 51 inch Magnavox rear projection has red and green overlapping

the coolant is bad inside the blue and green pix tubes-to verrify this you can remove the front edge of the screen(it pulls off-one edge at a time-take out screws to remove screen-after screen is off look down at blue/green tubes pix is bad or not there

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1 Answer

Green color out

loss of green color indications of failure of green crt. or green crt board. replaceing the tube ussaly cost 250 for part. however tube replacement in these set are very labor intensive. involveing removing and complex setup issues. at our shop it around 500 to replace one tube. rhese set ussaly not cost effective to repair unless under warrenty

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1 Answer

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

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.

Dec 18, 2008 | Zenith IQC50H94W 50" Rear Projection...

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BAD STK ics can cayse this problem.Stk 392-120.

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The huge yellow circle is either your blue filter is burnt out (very common in Zenith DLP) or you LCD cube is bad. I would bet it is the blue filter. Zeniths DLPs have 3 color filters one blue (a pinkish color), one green (a grayish brown)and one red (it is red). For the bulb indicator I would check and make sure your lamp is seated to the ballast correctly. Just take it out and put it back in.

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1 Answer

Bottom of projection tube is another color

Yes, worth fixing, sounds like convergence is out on the tip ends. Check papers for Convergence controls. See if have auto fix.

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2 Answers


The convergence IC's should be the first suspect in any convergence issue. Hopefully you can place the magnets back where they were or you will have that alignment to deal with first.

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