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Lost red - Samsung PCL5415R TV

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Hello
Your Tvs red output has gone out. It may be due to a driver transistor probelm or an Ic problem. If your tv circuit uses transistors to drive red, green and blue; red drive transistor has opened. If it uses Ic in video output stage, Ic is damaged.
Just check the voltages of the cathodes of other two, that is , take the voltage of green and blue cathode. Voltage at the red cathode must be very near to the same as the other two. In your case, voltage at the red cathode may be high, due to the trouble of the above said transistor.
You haven't stated about the picture condition. The above said will be correct, if the picture is correct, eventhough it has no proper colour balance. If picture is not there, the falult may be in the chroma section of your tv.

Posted on Oct 16, 2010

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