Question about Sony FD Trinitron WEGA KV-32FS100 32" TV
There are two causes for this problem. One is related with green output transistor, and the other is to chroma Ic. The most common cause is with the transistor said above. You just check the video output voltage points at picture tube base board. There are three cathodes may be marked as R,Gand B. In trinitron picture tubes, these pins are pin number [8 Blue KB], pin number [9 Green KG] and pin number [10 Red KR]; and the voltages must come approximately equal to KR=154, KB=155, and KG=163, and the main video output voltage goes to these transistors will come around 225VDC. These are not accurate voltages tor refer. It may vary by 2% to set by set. All the three transistors used will be identical in number, and usually found 2SC3271N. In your TVs case, green cathode voltage may be very low from the fault stated above I thinks. When cathode voltages goes low, emission of that cathode will increases, and colour of that cathode will be predominent. You just check these voltages, and check the main video input voltage said above too. There are three resistors of 2W fitted to the the main video voltage and collector of each transistor said above; and if any one,say the resistor fitted to green output transistor collector is faulty, or open or loose sodered, the voltage at the green cathode [pin-9] will be low causing this problem. If the transistor said above gor a leak with collector to emitter will also may the cause.
Just check it. Normally this base card of Sony TVs are marked C board. If all the transisors are found okl, and still the problem perisits, the fault must be in the Chroma Ic. It may need replacement.
In practice,I found this fault to be due to bad solderings in the base card. You just check it first and go forward.
If any doubts, contact me through Fixya. OK.
Posted on Nov 10, 2010
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Posted on Jan 02, 2017
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