10
The unit working principle analysis
For the PAL system, when the RF signal is input to the tuner, the turner generates IF signal. Then the IF
signal goes through the pre-amplifying circuit and 38M SAW, the VIF signal and 1ST_SIF signal will be
generated. When these signals are input into the M52760E IC, the VIDEO_OUT and SIF signal will be
generated. Then these two-way signals are sent to HEF4052BT, trapper and filter, which selective output
signal according to different sound systems (PAL D/K, PAL B/G, PAL I). The audio signal returns
toM52760E IC via filter to be decoded and then is sent to R2S15900, while the video signal is transferred
to multi-system signal CVBS_TV via trapper and then is sent to FLI8125 directly.
For the NTSC system, when the RF signal is input to the NTSC tuner, the turner generates IF signal.
Then the IF signals goes through the pre-amplifying circuit and 45.75M SAW, the VIF signal and
1ST_SIF signal will be generated. When these signals are input into the M52760E IC, the VIDEO_OUT
and SIF signal will be generated. Then the SIF signal is sent to MTS decoder to perform BTSC stereo
decoding, at last, the signal is input to R2S15900SP. The video signal is transferred to multi-system
signal CVBS_TV via trapper and then is sent to FLI8125 directly.
The AV, YPbPr/YCbCr, S-VHS and VGA signals from the input terminals, with the CVBS_TV signal, are
sent to the main IC FLI8125, after decoding, filtering, De-Interlace, Adc and Scaler, and according to
different panel, the main IC generates a 24-bit TTL signal or LVDS signal to send to the panel to recur
the picture.
10
THE UNIT WORKING PRINCIPLE ANALYSIS
LCD-20XR1AU.indd Sec1:10
LCD-20XR1AU.indd Sec1:10
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2006/07/13 11:59:20
Summary of Contents for LCD-20XR1/AU
Page 13: ...11 BLOCK DIAGRAM ...
Page 16: ...14 4 Inner block diagram of TPA1517 6W stereo audio amplifier 14 IC BLOCK DIAGRAM ...
Page 23: ...21 SCHEMATIC DIAGRAM 1 INTERFACE ...
Page 24: ...22 SCHEMATIC DIAGRAM 2 TUNER AUDIO ...
Page 25: ...23 TO INFRARED BORAD SCHEMATIC DIAGRAM 3 SCALER FLI8125 ...
Page 26: ...24 SCHEMATIC DIAGRAM 4 FLASH ...
Page 27: ...25 SCHEMATIC DIAGRAM 5 OUTPUT POWER KEY BOARD ...
Page 28: ...26 SCHEMATIC DIAGRAM 6 POWER BOARD INFRARED BOARD ...
Page 29: ...27 EXPLODED VIEW 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 ...