Panasonic M17W movement widescreen TV Y / C separation circuit schematics and repair |
| Time£º2014-06-10 09:53:15 Source£ºNetwork Author£ºUnknown Clicks£º1582 |
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4. Receive only the NTSC color video signal without color, but black and white image system of the normal fault is obviously NTSC4.43 Y/C separation chromaticity band-pass filter circuit in the circuit damage caused chroma signal loss caused by. When inspection, measuring IC5503 7 feet first presence of chrominance signal input, if have, explain IC5503 7), bad foot analog electronic switch circuit; If not, should check whether LC5501 bandpass filter leakage damage and R5557 C5529 whether, damage, etc. j6Eservice manual download site
Color video signal, the image is 5. Everything is normal, black and white television reception, screen image by figure 1. It is not hard to see, the source of trouble largely in Q5511 emitter to shoot with the buffer between IC5502 7 feet and filtering circuits. Maintenance measure IC5502 7 feet first input video signal, if any, should be check whether IC5502 and (4) feet external circuit component damage; If not, then respectively detect Q5534, Q5535 base and the emitter voltage is normal (Q5534 in normal working conditions of the base and emitter voltage 4.1 V, 4.8, the Q5535 base and emitter voltage of 4.1, 3.5 V). If normal, should check whether C5538 and its surrounding the printing line fault or open circuit damage; If the measured voltage is abnormal, should check the pin external circuit component is damaged, or Q5534, whether Q5535 damage, etc. j6Eservice manual download site
Comb filter IC5501 of integrated circuits (MN5236) the pin function and its normal working voltage parameters as shown in table 2. For panasonic M18W machine heart wide-screen TV main picture Y/C separation circuit and the machine have the same heart, so this article contents stated also applies to panasonic M18W heart series color TV.j6Eservice manual download site
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