Panasonic M17W machine heart wide-screen TV typical machine with TC - 24 wg12g, TC - 28 wg12g, TC - 32 wg15g etc., this paper takes the TC - 28 wg12g as an example, introduces the machine heart color TV Y/C separation circuit working principle and troubleshooting methods. b9Fservice manual download site
 b9Fservice manual download site
A, work principle b9Fservice manual download site
 b9Fservice manual download site
TC - 28 wg12g Y/C separation of signal process circuit diagram is shown in figure 1. Can be seen from the figure 1, SECAM system with NTSC4.43 luminance and chrominance separation system of color video signal is done by conventional band-pass filter, and its system of PAL and NTSC3.58 color video signal is through digital comb filter IC5501 (MN8236) as the core of the comb filter Y/C separation circuit to realize the Y/C separation function. PAL/NTSC3.58 Y/C separation system comb filtering circuit schematic diagram and working diagram as shown in figure 2 and figure 3, respectively. b9Fservice manual download site
 b9Fservice manual download site
T35. GIF (14797 bytes) b9Fservice manual download site
 b9Fservice manual download site
1. b9Fservice manual download site
 b9Fservice manual download site
T36-1. GIF (15301 bytes) b9Fservice manual download site
 b9Fservice manual download site
2. b9Fservice manual download site
 b9Fservice manual download site
T36-2. GIF (15313 bytes) b9Fservice manual download site
 b9Fservice manual download site
3. b9Fservice manual download site
 b9Fservice manual download site
By the AV controller IC3001ts35-1. GIF (128 bytes) feet of composite video output signal by the strip H1 (A11) ts15-6. GIF (129 bytes) feet and room A41 (Y2) end feet to Y1 luminance and chrominance separation printing circuit board. b9Fservice manual download site
1. Y/C separation strip Y2 NTSC4.43 system end feet input video signal after Q5511 shot with the output, all the way through a band-pass filter out LC5501 4.43 MHz NTSC chroma, to switch IC5503 7 feet, a path DL5501 internal delay circuit delay, LC5502 low-pass filtering and Q5510 ~ Q5508 buffer enlarged luminance signal to the video switch IC5502 5 feet. b9Fservice manual download site
2. SECAM system Q5511 shot with the output signal Y/C separation within the video signal by DL5501 band-pass filter circuit excellent degree of signal separation to IC5503 attending his feet, and the brightness of the isolated signal processing with NTSC4.43 system, namely to IC5502 5 feet.

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