XOCECO LC-27U16, Руководство по обслуживанию

Страница: 10 / 45

8
control so as to enable the liquid crystal TV set to
recheck the signal and then to display correct picture
signal
Working principle analysis
RF signal from the antenna to tuner, via high frequency amplifier and mix frequency to obtain IF
signal, and then via pre-IF amplifier in V104, then it send to processed IF filter of SAW (Z103),
obtain more idea IF speciality, it processed to IF amplifier, phase locked logic VCO and sync
detection of N101 (M52760E) in the TV board to obtain VIDEO; IF via pre IF amplifier to send to
processed filter of SAW (Z102), again send to processed IF amplifier of N101, decode second SIF.
From M52760E output VIDEO, AV1 and AV2/S signal all send to video decoder N601
(TVP5147PFP), via video select, clamping, A/D transfer, comb filter and color decode, one way
output AV OUT, another way output 8bit for CIR656 format signal and CLK signal, send to
N101(MST6151) of CPU board, Also YPbPr, VGA and HDMI send to N101. N101(MST6151) is
many function big dimension integrate circuit, it processed HDMI, A/D to DA switch, interlaced and
non-interlaced processing, model switch and low voltage difference output functions and so on, it
send to four ways difference signal and one way clock signal to LCD display.
From HDMI input to MST6151contain sound signal, via processed MST6151, send to processed
D/A switch for NA01(CS4340), output L/R of HDMI.
Output SIF from M52760F and send to processed stereo demodulation for N201(LA72700), output
L/R of TV.
L/R of HDMI and Ypbpr from CS4340 output, L/R of VGA/DVI signal via sound switch
NA02(HEF4052) to select, then send to sound processing N301(R2S15900SP); demodulate L/R
signal of LA72700 send to N301, and L/R signal for AV1A and V2/S input send to N301. Via
selected switch and processing sound, one way sound output for AV OUT, other way send to
N401(TPA3008D2) of sound amplifier, via amplify for sound signal to speaker and earphone.
The unit working is controlled N801(MTV412) of CPU, connect tuner, TVP5147, LA72700 and
R2S15900SP to IIC bus; connect MST6151 to parallel BUS.