Question about Samsung Televison & Video
Samsung flatscreen tv model LN46C600F3FXZX will turn on, has sound but no picture, picture went out while watching it, unplugged set for 5 minutes and still nothing, unplugged for 24 hrs. and still nothing, please help.
Video section has become compromised and no longer functional. Audio being separate from the Video may work perfectly, but the Video portion sustained damage to the circuit board or the inline safety diode blew. If any parts of the Circuit Board fail, you need to replace the mainboard. The cost to generally fix a circuit board is usually more than the replacement cost for a new unit. Check all fuses or circuit limiters inside the TV and if there are no shorts, burned parts, or obvious smells on the mainboard, transient current may have trickled in and damaged sensitive electronics. Have a professional Technician do tests to locate the source of the problem.
Posted on Dec 25, 2013
There probably has been an internal power supply failure.
Posted on Dec 25, 2013
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Posted on Jan 02, 2017
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.
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:
Weak signal or defect in tuner/IF causing loss of signal strength.
Coler killer set too high (internal control) if it has one.
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.
Posted on Jun 14, 2010
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