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CHAPTER 3 CHANGHONG PDP TELEVISON PT4206
entire signal flow analyse
3.1
Each part signal
Disposal Flow general
3.1.1
Analog signal Disposal Flow
3.1.1 .1RF
Disposal
TDQ-6F7-FMW2
disposal the RF signal
Pin Function Descriptions
Pin(s) Name
Function
1
VT
Analog tune voltage not use
2 BTL
+32Vpower
3 BM
+5V
power
4 ADD
Ground
5
S0
Color system Switch control
6
S1
Color system Switch control
7 SCL
I
2
C bus clock
8 SDA
I
2
C bus data
9
SIF
Second sound IF signal output
10
VIDEO OUT
video signal output
11 VIF
Power
supply
12
AUDIO OUT
Sound LF signal output(not use)
First the antenna signal enters the Unify RF TUNER N901, enlarge the RF signal , choose the
back track of frequent and mix frequent circuit ,and outputs the IF signal. The video signal from
the 9 pin through the video check wave, differs to clap at the same time the Second sound IF
signal output.
The frequency synthesizing and tuning needs two power supplies when work no 32
V tune voltage and + 5 V PLL power supply.
Moreover 5 and 6 pin of N901 switch the Color system , sending out from 44 and 50 pin of
PW113.10 pin of N901 outputs video signal ,follows to Q905 ,through the video switch circuit
switching with the AV/ S- VIDEO
Input signal ,after them disposal in VPC3230.
3.1.1 .2 SOUND Disposal
the 9 pin of N901 outputs the second sound IF signal, enlarged by the Q910,following to
Q602 and passing C611 to the 67 pin of MSP3410G to carry on SIF demodulation and the
NICAM identify the decoding The sound of PC, DVI, AV, YCbCr, and YPbPr are transited to
MSP3440, and then input to the speakers after transits to TA2024 and to the speakers.
.
3.1.1.3 digital signal disposal
In response to input signal of PW113 ,it must convert the input analog video signal, VGA
analog signal and DVI signal into digital or video decode output include three parts one, VGA or
YpbPr (analog signal)is converted the signal into A/D by MST9885
it is 24bit digital tricolor
signal
second various video signals
include TV signal
are disposalled by VPC3230
then
output the signal format ITU-R656 YUV signal
The third part decode DVI1.0 standard digital
signal then output 24bitRGB signal