Question about Samsung BN5900696A Remote Control

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My TV is a Samsung 40" flatscreen. The sound is working fine, but the picture is now nothing but multi-colored diagonal lines, and is confined to the top left quadrant of the screen (the rest of the screen is black). Did I press a button and not realize what I did?

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No, there's a defect on it. And the only defect that looks like that is a bad synchronisation circuit in CRT projection tv's on an activated PIP screen. Knowing the exact model of your tv will help.
First of all you should try to exit the PIP - there's a button on the remote for that. If the broken image doesn't spread to the entire screen then the defect is probably in the control processor.
Next you should check that the tv behaves the same whatever the source of the signal. If it does then the defect is in the mainboard, and to fix that a repairman is mandatory, there's nothing more you can do.

Posted on Aug 25, 2010

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This means absolutely no color - equivalent to a black and white picture. Not even a hint of color.

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 transmission.

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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:

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

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Defective part around the chroma chip/circuit. Faulty color oscillator.

Bad connections in area of chroma chip/circuit.

Defective chroma chip (don't suspect this first just because it is probably very expensive).

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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