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Hello, My panasonic WJ AVE7 has green tint output on one cannel and red on the other. There are some capacitors that are in the chroma circuits which cause the problem, but witch ones? Help much appreciated, Thanks

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Posted on Jan 02, 2017

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SOURCE: panasonic viera

Does it happen with all inputs?

The most common problem I have found with this type of problem is a component cable coming loose from the television or cable or satelite box. If this is the case you can check by turning on the DVD and see if it has the same problem.
If only one input has this problem and the input devices work well with the other inputs, then, the problem would be in the main board.
Check the tint, is it centered? It should be.
With the color turned down is there a good black and white picture (Does the set have a good gray scale)?
These are the questions that my shop use to identify the source of the problem before we schedule a service call.

Posted on Dec 02, 2007


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Our tv keeps changing colours to blue red and green

Your television have color problem.That symptom is cause of loose connection or cold solder in chroma section and color output driver transistor of CRT board of your television.You can fix that problem by resoldering the chroma section and crt socket section of your TV.first thing to do is open or remove the back cover of your TV,then you can see the crt board connected to picture tube.Resolder that parts,specially the color output transistor the red,green and blue driver.Resolder also the chroma section.You can see the jungle ic,thats the color ic.Make sure that there's no short circuit when soldering the PCB board.After the resoldering turn on the TV and check if color is normal.Thanks..

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Have you measured the voltages at the collectors of the three video output transistors?. There must be a voltage over 124 to140VDC at least. All voltages at the base of that transistors should be between 2.5 to 3.75VDC according to the level of chroma signal from the chroma Ic.
You must check these voltages with a good quality digital or analogue multimeters, otherwise you will get only false values instead of the real. You just check the main voltage that goes to the video output stage, that is the high voltage comes to the crt base, from the main board. It should be more than 260VDC. Normally in all tvs this voltage is derived from the LOT. After rectifying it and filtered with a 10Mfd 350V capacitor, and given to the baseboard as the main supply to video output stage. If the smoothing capacitor [10Mfd] gets value changed, that is if it gets a low value due to age, otherwise whether it has an internal short, you won't get the above said 260VDC at the CRT base boad. At first locate this capacitor and replace it with a new one with same capacity and voltage ratings. and check all video output [ 3 of them] transitors too. Check the transistors for collector to emitter leak, not on circuit, but after take it out desoldered. Then only you will get the proper measurement of leak. Set the multimeter in MegOhms rage, and don't held the transistor by hand too. If you do so you will see some deflection in the meter due to your body resistance.
Check the capacitor first. Replace it. It is best. Check the rectifying diode that rectifies this voltage from the LOT winding. If it has a leak, you will get a low voltage at this rail.
Remember, LOT works at high frequecy. So the diode used there as retifier is a special type, fast recovery diode, and should be repaced with the same number. Never use ordinary diodes that we uses for line rectification purpose.
Remember, colector voltages at the video output transistors must be above 140VDC. Again recomends to use a good quality multimeter, as cheaper one cannot measure this voltage accurately.
Ok. Wish you all sucess.

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1 Answer

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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.
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when tv is on. if the color changes by tapping u can get the loose contact..have a nice day

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Good day.
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