Question about Zenith IQB50M90W 50" Rear Projection Television

5 Answers

Zenith IQC50H95W displays in monochrome

Hi
Just noticed a new problem with this set - when connecting any non-component-video source to any input, it displays in black and white. I hadn't noticed because normally the only devices connected are the HD cable box and progressive scan DVD player and those both display nice color via YPbPr, but now I've found that when connecting anything to the two antenna-in jacks, the rear video inputs via composite or S-Video, or to the front video input, it all displays in black and white. Any thoughts? Thanks! -paul

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  • pdieten Nov 19, 2008

    Tried that. It didn't work.

  • pdieten Nov 19, 2008

    Tried leaving it unplugged for 30 minutes then plugged it back in. Everything is still black and white except component video.

  • pdieten Nov 19, 2008

    Okay, I see the new offered solution. What does that mean and will it be expensive to fix?

  • pdieten Nov 20, 2008

    Not a PAL problem, this happens with everything I plug in via RF or composite. I tried a Zenith DTT900 converter box. It displays black and white. So does my basic cable connection. Everything is B&W except video input via component. I don't see anyplace to set PAL on the TV anyway.

  • pdieten Nov 20, 2008

    OK. I don't work on electronics made after the tube era, so I'll have to call the shop. I just don't know what such a repair might cost. Thanks much

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5 Answers

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Hi,

Since your general location is in the United States and Zenith being predominantly designed/marketed in the US makes this unit purely an NTSC color system. Having said this, then color system selection (choices of PAL, SECAM and others) need not be considered.

That would leave us with the one of the boards which is responsible for deciphering and embedding the necessary color to any video signal that passes through RF, composite Video and/or S-video. Component level wise repair would involve check of the ICs, the 3.58MHz crystal and other components. To verify, voltage checks should be performed on a live set with the back open. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 20, 2008

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Sir,

It's possible that there is difference between the NTSC and PAL encoding on the DVD and your TV playback. If your TV/DVD is set to PAL, NTSC DVDs will be played black and white.

thanks
goodluck

Posted on Nov 20, 2008

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It suffers from the same progressive video bug as the Hitachi where the RPTV video shuts down during sudden screen intensity transitions like the inputs were being overloaded. The Pitch Black trailer on the U-571 DVD is a prime example of this bug. No VGA connector for use with the RCA DTC-100.

Posted on Nov 19, 2008

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Either the 2nd input color system is not properly selected or a fault arose in the chroma section of 2nd input.

Posted on Nov 19, 2008

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Have you try to hard reset the system?
1. turn off
2. remove/unplug the power cable including from the main switch
3. leave it for 30 minutes
4. plug in the power cable
5. turn it back on

Posted on Nov 19, 2008

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Posted on Jan 02, 2017

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