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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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1 Answer

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..

Aug 26, 2011 | Televison & Video

1 Answer

While testing vdc at the base board for the cathode wires found that the red and blue were at 4 VDC and green was at 8. Picture has mainly blue and green tints.No loose soldier joints found.


Hello
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.

Oct 23, 2010 | Proscan PS36125 36" TV

1 Answer

Lost red


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.

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3 Answers

Panasonic CT-32SL14J green picture after blown fues replaced


no there may be loose contact or dry solder in circuit board attached to tube..ie video driver section ..resolder
all the solder joints cleanly...&also resolder the long ic ie
chroma ic...u can find where the problem is by gently tapping the main board or video board by a tooth brush
when tv is on. if the color changes by tapping u can get the loose contact..have a nice day

Mar 10, 2010 | Panasonic CT-32SL14 32" TV

1 Answer

Color sudden change


Good day.
Your unit is still worth. It may be a caused of loose contacts along the circuitry. It can be remedied by resoldering the terminals particularly the chroma section and the crt circuit.


chris

Mar 25, 2008 | Toshiba 36A61 36" TV

1 Answer

No power


slight change in capacitor value does not make much differnce so do not worry your just green light indicates that there is a problem in green cathode circuit. check for green output supply check for loose in connector ckt from chroma ic to cathode regards thanks

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2 Answers

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I would check the green signal all the wat to the display screen to determine is this is a signal problem or a system short. I would recommend that you take this set to a qualified electronics technician

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have JVC AV-32F702 TV. It's picture color is very red. unable to adjust colors through menu. Channel numbers are also in red now instead of normal green. any suggestion? please check red color cathode circuit 1 check red output from ic to red cathode ckt 2 check voltage on r output ckt& ic or tr. 3 check loose contact in red cathode ckt 4 check crt base for loose. 5 loose connector 6 chroma ic thanks

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2 Answers

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first try going to the menu on the tv and adjusting the red blue and green tint....if not the u need to remove the front pannel and move the the the top left knob on the setting to lower the tint...

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