Question about Hitachi 50SBX78B 50" Rear Projection Television

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No color My T.V. is no longer color. The Picture in picture has color, but the main tuner is black and white. What could this be?

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  • Gusto666 Sep 14, 2007

    It is hooked up to cable with coaxle.

  • Anonymous Mar 25, 2014

    Color faded looks almost black and white

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  • 56 Answers

Does the tv use Svideo as an input from whatever device you're using on the main screen? if so , try changing out the cable for a new one, svideo carries 2 signals, color and brightness (ie color and black signals) if your cable is bad or broken, you may only be getting one of those signals ( the black one) try a new cable if it's s-video. if it's not, get back to us.

Posted on Sep 13, 2007

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1 Answer

Picture is now black and white


 First, confirm that the source is actually in color - try another channel or input device.
Next, check the settings of the color control - it may have accidentally been turned down. If your TV has some kind of automatic picture mode, try turning if off and adjusting the color control. Try adjusting fine tuning if you have such a control and the problem is with a broadcast or cable
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At this point with a confirmed color signal source, there is a problem with the chroma circuitry.
Note that to the average person, the obvious question becomes: is my color picture tube bad? The answer is a definitive NO. It is virtually impossible for a defective CRT to cause a total loss of color. A defective CRT can cause a lack of a primary color - R, G, or, B or a short between two colors which will mess up the color but is not likely to result in a black and white picture.
Some possibilities in no particular order:

  1. Weak signal or defect in tuner/IF causing loss of signal strength.
  2. Coler killer set too high (internal control) if it has one.
  3. Defective part around the chroma chip/circuit. Faulty color oscillator.
  4. Bad connections in area of chroma chip/circuit.
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A service manual or Sams', DMM, and scope will help greatly in attempting to troubleshoot this unless it is an obvious bad connection. Try prodding the main board around the chroma chip with an insulated tool to see if you can make the color come and go.
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