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Re: no picture will talk, picture dark
If you mean you have nothing on the screen, either the backlight or its associated power supply has faiiled.
Look at the screen at several different angles; if you can see some sign of motion, then the LCD panel itself is still ok.
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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.
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.
Three guns Red Blue and Green in the picture tube of an old CRT set. If one of the guns goes out it effects that color. Sounds like one of the guns inside of the tube is going out, To costly to replace for such an old antilog set that will have to have a convertor box next month anyway.
This sounds like a high voltage discharge is occurring! Ask your repair guy to check the PTC and all the chassis return circuit black leads and the integrity of the connections to the discharge "spring" across the back of the picture tube. It could also be caused by poorly connected or incorrectly seated wires from the EHT transformer to picture tube pcb. These are dangerous voltages ( 20000 + volts)we are talking about, under no circumstances should an unqualified person attempt this kind of repair, also as after checking all connections, the final test must be with the set open in darkness for observation purposes.
Apparently you have a possible component failure with your Panasonic PVQ-2510.
This would involve the circuitry at the back/neck of the picture tube. Diagnosis would require familiarity with discreet components, use of a VOM, soldering and general component knowledge. In as much as it is possible that your red drive transistor (or an IC) would require replacement or resoldering, your best bet is to seek the services of a qualified professional.
Should you venture to do a do-it-yourself, pls post back.
Good luck and kind regards.
You might've done this already, but first I would try the "Magic Focus" The button can be found all the way to the left of the buttons panel on the tv itself. If that has no effect, try playing around with the settings within the tv. Click menu on the remote and see what happens when you try settings like color, balance, and contrast.
By description it seems your set lost what is known as luminance and is processing only the color information,there is really no easy way to repair this problem without being involved in measuring some voltages and checking some components with a volt meter,there is a video processing IC and some of its functions are to process the video from all sources,an squematic is needed to check and follow the video signal,you can get the service manual at www.servicemanuals.net and the cost should be around 20.00 dollars if you downloaded it.If you are familiar with tv service you now have a place to check but if you are not too familiar and because the nature of the problem you should seek the assistance from a servicer.Let Us know how it goes and if you need more information.