Philips 42PF9945 Service Manual page 38

Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.2
Block Diagram
CVBS 1
STATUS
R1
G1
B1
FBL 1
TUN_CVBS
OUT
read_status2
STATUS 2
Y/CVBS2
R2 C IN
G2
B2 C OUT
FBL 2
Y/CVBS 2 OUT
From OTC
P50
cv bs ext 3
CVBS 3
CIN
STATUS 3
The main tuner is a PLL tuner and delivers the IF-signal, via
audio and video SAW-filters, to the main HIP (High-end Input
Processor). This HIP has the following functions:
•
IF modulation.
•
Video source select and record select (for 1fH inputs).
•
Colour decoder.
•
Synchronisation.
The following video input/output connections (with audio
connections) are available for Europe:
•
Side: interfaces CVBS and Y/C.
•
EXT1: interfaces CVBS, RGB-, and YUV-input (1fH)
•
EXT2: interfaces CVBS and Y/C (meant for VCR or DVDR
connection).
•
EXT3: interfaces CVBS.
•
AV5: interfaces YPbPr (2fH/3fH).
•
AV6: interfaces VGA (2fH/3fH).
The HIP delivers YUV and H/V-sync signals to the PICNIC (in
the Feature Box). This IC takes care of:
•
Analogue to Digital conversion and vice versa.
•
100 Hz processing
•
Interlaced to progressive scan conversion.
•
Panorama mode.
•
Noise reduction.
•
Dynamic contrast.
After the PICNIC, the YUV-signals are fed to the FALCONIC for
"Natural Motion", followed by the Eagle for picture
enhancement. The processed YUV signals (from Eagle or
PICNIC) are, together with the sync-signals from the PICNIC,
then fed to the EBILD (Eagle Based Intelligent LCD Driver).
This programmed IC handles the video control. The RGB-
signals for TXT/CC/OSD (from the uP) are also inserted via this
IC. The video part delivers the RGB signals to the PDP-panel.
VIF OUT
IF
SCART2
OUT
PIP
MAIN
Y C
G
OUT
OUT
CVBS pip
Y C Y C
D
cvbs
ter
cvbs int
Y/Cvbs ext 1/4 main
cvbs 1
read_status 1
rgb ext 1
YUV1fH
fbl ext 1
TUN_CVBS OUT
Y/CVBSrecordOut
yuv 1fh
cvbs 2
y-cvbs 3
c3
y-cvbs 4
c4
FBL 1 in
FBL 2 in
rgb1
rgb2
Figure 9-3 Block diagram FTP11
HIP
MAIN
out
CVBS PIP
OUTmain
2FH/3FH
INPUTS
YUV MAIN
FBX
PR
OC
Y
COMB
C
VD
Comb control
CVBS txt out main
CVBS TXT
set_rgb_main
The sound part is built around an MSP (Multi-channel Sound
Processor) for IF sound detection, sound control and source
selection. Amplification is done via a "class D" integrated power
amplifier IC, the TDA7490.
The microprocessor, called OTC (OSD, TXT/CC and Control)
takes care of the analogue TXT input processing and output
processing. The OTC, ROM, and RAM are supplied with 3.3 V.
The NVM (Non Volatile Memory) is used to store the settings;
the Flash-RAM contains the set software.
9.3
Power Supply
For Service this supply-panel is a black box.
When defect (this can be traced via error-codes in the error
buffer, or by strange phenomena), a new panel must be
ordered, and after receipt, the defective panel must be send for
repair.
In that case before sending it, check if the supply-output lines
match with the values on the PDP-sticker.
FTP1.1E
LVDS
EBILD
transmitter
A/D
HD3
RGB OTC
I2C
OTC blanking
OTC
Keyboard input
P50
to scart 2
9. EN 97
PDP
CL 36532075_046.eps
201103