Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.
9.7.1
Inputs
PC (VGA) input specifications
•
RGB Video: 0.7 V_pp, positive polarity (negative pin via
136 Ohm resistor to ground).
•
Separate Sync (H, V): TTL level, positive or negative
polarity. One loop goes via two inverters to the Scaler IC
(JagASM); the other loop goes directly to the Painter
microprocessor on the TV board for VGA detection. If no H
or V sync is detected after 3 s, the set will go to standby.
•
DDC NVM: This chip provides the PC with identification
info (e.g. type, support PC mode, LCD panel timing, etc.),
when the TV is used as a PC monitor. It is directly
connected to the VGA port.
•
Reset circuit: When the power is switched “on”, the
RESET line will go “high” for 240 ms, and then turn to “low”
for normal operation. To reset the Scaler IC, this signal is
inverted (RESET#).
HD (YPbPr) input specifications
Input via Scaler Board. Supports:
•
576p, 720p and 1080i for PAL
•
480p, 720p, and 1080i for NTSC.
•
Sync Detection: SOG/SOY and YUV/RGB supported.
9.7.2
Video Converter: Fli2300
This 208-pins BGA-IC creates a picture signal with double the
scan lines of a conventional interlaced picture, to create a
noticeably sharper and smoother image. It offers higher picture
resolution and eliminates virtually all motion artefacts. Even on
large screens, the progressive scan lines are barely noticeable
and it reduces picture flickering significant.
Below listed processing is done in the Fli2300:
•
HD/SDTV brightness, saturation, hue, and sharpness
control.
•
Noise reduction and de-interlacing (only for SDTV).
•
Scaling
•
DAC RGB output for fault finding (on connector 1352)
9.7.3
Scaler: JagASM
This IC is a highly integrated display processor with advanced
analogue and digital signal processing.
The JagASM is a 388-ball PBGA device. It has 352 balls for
signals, power and ground and a centre
matrix of 36 balls. These centre matrix balls are used as
thermal connections for better heat dissipation.
Below listed processing is done in the JagASM:
•
Colour temperature and White-D control.
•
SD/HD/PC contrast control.
•
PC input ADC.
•
PC related processing.
•
Scaling and Frame Rate Conversion for PC.
•
Picture In Graphic (PIG) processing.
•
OSD for HD and PC mode.
9.8
Audio Processing
Figure 9-5 Block diagram audio processing
CL 36532023_094.eps
160403
TUNER
VIF
VSIF
IF
AGC
7301 BOCMA
SAW
HP
MUTE
1
16
11
2
8
7
9
7602 MSP 3451G
50
21
20
MONO-IN
SIF
47
SC1-L-IN
44
SC1-R-IN
45
SC2-L-IN
41
SC2-R-IN
42
FRONT-IN-L
38
FRONT-IN-R
SC1-R-OUT
SC1-L-OUT
39
L
R
SAW
SOUND
TRAPS
QSS DEMOD.
+ AM DETECTION
3326
3327
7305
+8V
CVBS
3301
3302
7307
+8V
A/D
DEMOD.
INDENT
DSP
D/A
D/A
D/A
A/D
A/D
29
28
INPUT SWITCH
7731
8
6
L
R
10
9
2
23
12
4
EXT.
SUBW.
