How
does an LCD TV works. Given description
is with reference to Dynex 42 inch LCD TV
The analog and digital RF signal received by antenna will be sent to integrative tuner TUNER2(DA58GT-13-E, contains HF and IF amplifier circuits), which selects appropriate channel and sends the selected IF signal to the next level by the control of SDA, SCL. The analog RF signal sent to tuner, via high amplify and mixed frequency to get IF signal VIF, then it will be divided into two ways, one way will be sent to acoustic surface-wave ZF3 to IF filter and get better IF characteristics, then it will be sent to NF1(M61111FP) through pin20, 21 to do intermediate amplification, phase-locked loop VCO and synchronous wave detection and output VIDEO-TV(ATV) from pin1; another way will be sent to acoustic surface-wave ZF4 to IF filter and gent better IF characteristics, then it will be sent to NF1(M61111FP) to do intermediate amplification and wave detection and output SIF from pin10.
The digital RF via high amplify and mixed frequency in the tuner, output deferential digital IF signal from pin10、 11, the signal will be sent to the main IC S01(MSD319EL) to do intermediate amplification and demodulation, then demodulate the transform stream TS which contains video/audio and other information.
ATV, SIF, TS, audio/video signal of AV, S-VIDEO, VGA and HDMI. Component video signal selected by switch NB09(PI5V330W) from Component 1 and Component 2, Then one of video signal selected by switch NB10(PI5V330W) from Component and VGA . AV, S-VIDEO ,Component audio signal selected by switch NB11 HEF4052BT), HDMI audio/video signal selected by internal switch from HDMI1, HDMI2, HDMI3; all of the signals will be sent to the main IC NS01(MSD319EL) switch select, video decode and process.
In MSD319EL,TS of DTV via TS demultiplex, distinguish the different programs and pick-up the corresponding audio/video stream and data stream, after MPEG-2 uncompress, video coder and audio D/A transform, recover the analog video signal YCbCr and audio signal L/R.
ATV output from M61111FP will be sent to MSD319EL video switch, A/D convert and digital decode. The video selected by switch embed in MSD319EL will be sent out in two ways: one is sent to decode and process; the other is Video OUT. All of the video data (include DTV video) via switch select, video decode and process will be sent to MSD319EL to do D/A transition, image scale, OSD superposition, then LVDS conversion to signal acceptable for LCD panel, namely four pairs of low differential signal and one pair of clock signal, then it will be sent to LCD panel for picture display.
All of the audio signals will be sent to MSD319EL to do audio switch selection and sound effect processing, then output L/R to sound amplifier NV03 (R2S15112FP) amplifying to speaker. The audio L/R also sends to Audio OUT.
The analog and digital RF signal received by antenna will be sent to integrative tuner TUNER2(DA58GT-13-E, contains HF and IF amplifier circuits), which selects appropriate channel and sends the selected IF signal to the next level by the control of SDA, SCL. The analog RF signal sent to tuner, via high amplify and mixed frequency to get IF signal VIF, then it will be divided into two ways, one way will be sent to acoustic surface-wave ZF3 to IF filter and get better IF characteristics, then it will be sent to NF1(M61111FP) through pin20, 21 to do intermediate amplification, phase-locked loop VCO and synchronous wave detection and output VIDEO-TV(ATV) from pin1; another way will be sent to acoustic surface-wave ZF4 to IF filter and gent better IF characteristics, then it will be sent to NF1(M61111FP) to do intermediate amplification and wave detection and output SIF from pin10.
The digital RF via high amplify and mixed frequency in the tuner, output deferential digital IF signal from pin10、 11, the signal will be sent to the main IC S01(MSD319EL) to do intermediate amplification and demodulation, then demodulate the transform stream TS which contains video/audio and other information.
ATV, SIF, TS, audio/video signal of AV, S-VIDEO, VGA and HDMI. Component video signal selected by switch NB09(PI5V330W) from Component 1 and Component 2, Then one of video signal selected by switch NB10(PI5V330W) from Component and VGA . AV, S-VIDEO ,Component audio signal selected by switch NB11 HEF4052BT), HDMI audio/video signal selected by internal switch from HDMI1, HDMI2, HDMI3; all of the signals will be sent to the main IC NS01(MSD319EL) switch select, video decode and process.
In MSD319EL,TS of DTV via TS demultiplex, distinguish the different programs and pick-up the corresponding audio/video stream and data stream, after MPEG-2 uncompress, video coder and audio D/A transform, recover the analog video signal YCbCr and audio signal L/R.
ATV output from M61111FP will be sent to MSD319EL video switch, A/D convert and digital decode. The video selected by switch embed in MSD319EL will be sent out in two ways: one is sent to decode and process; the other is Video OUT. All of the video data (include DTV video) via switch select, video decode and process will be sent to MSD319EL to do D/A transition, image scale, OSD superposition, then LVDS conversion to signal acceptable for LCD panel, namely four pairs of low differential signal and one pair of clock signal, then it will be sent to LCD panel for picture display.
All of the audio signals will be sent to MSD319EL to do audio switch selection and sound effect processing, then output L/R to sound amplifier NV03 (R2S15112FP) amplifying to speaker. The audio L/R also sends to Audio OUT.
The unit is control by the MCU built in MSD319EL, it connects TUNER and E2PROM through IIC bus line and controls the whole unit working.
