Question about Mitsubishi WS-55513 55" Rear Projection HDTV

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Mitsubishi WS55513 480i Signal no Color

Hi,

I have an issue where only my 480i signals look horrible. There is virtually no color, looks almost black and white and there are light bands running vertically all across the screen. My 1080i signals look great! The TV is about 5 years old and I never had it re-calibrated, so I am wondering if that's all it needs? I had the blinking green light of death about 6 months ago and I repaired that by replacing the Caps, but I don't think this is related? Any ideas???

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  • Anonymous Feb 05, 2009

    I am connected to a Comcast HD Cable box through a Component Connection

  • Jim Williams Feb 05, 2009

    I am connected to a Comcast HD Cable box through a Component Connection


  • Jim Williams Feb 06, 2009

    That fixed it! Although pressing Menu on the box didn't work, I had to press menu on the remote and changed the setting to 480p and SD channels now look good again. I had this problem for 4 or 5 months now, I wish I would have posted something sooner.....Thank you very much for your input!!!

  • What are your signals coming from and how are they connected to the TV?

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  • 139 Answers

That may be a TV problem but can also be a Cable box problem.Do you have any other 480i signals hooked to the TV?
Also most Comcast HD boxes can be set to output SD signals at 480p which may solve the problem. Usually get to the setting by turning the cable box off and pressing menu on the box, not remote.
It should display a different menu on the tv screen, arrow down to 4X3 overide then arrow right and try 480p.

Posted on Feb 06, 2009

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Posted on Jan 02, 2017

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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 transmission.

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.

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Weak signal or defect in tuner/IF causing loss of signal strength.

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 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.
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  3. Defective part around the chroma chip/circuit. Faulty color oscillator.
  4. Bad connections in area of chroma chip/circuit.
  5. Defective chroma chip (don't suspect this first just because it is probably very expensive).
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.
I had one set where a $.02 resistor decided to open up causing just this problem - perfect BW picture, no color. Another had a coil with a broken wire.  


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