Philips LC4.6E AA, Руководство по обслуживанию, Страница: 80 / 93

Circuit Descriptions, Abbreviation List, and IC Data Sheets EN 80 LC4.6E AA 9.
• LED. This signal is used as an indication for the Stand-by,
Remote and Error Indicator. Region diversity:
–
During protection mode, the LED blinks and the set is
in stand-by mode.
– During error conditions it blinks at a predefined rate.
– After receiving a valid RC-5 or local keyboard
command it flashes once.
– For sets with error message indication, the LED blinks
when message is active and the set is in stand-by
mode.
• SCL. This is the clock wire of the two-wire single master bi-
directional I
2
C bus.
• SDA. This is the data wire of the two-wire single master bi-
directional I
2
C bus.
• STANDBY. The Hercules generates this signal. This can
enable the power supply in normal operation and disable it
during Stand-by. It is of logic “high” (3.3 V) under normal
operation and “low” (0 V) during Stand-by.
• IR. This input pin is connected to an RC5 remote control
receiver.
• SEL-IF. This is an output pin to switch the Video SAW filter
between M system and other systems.
–
0: NTSC M (default)
– 1: PAL B/G, DK, I, L
• NVM_WP. The global protection line is used to enable and
disable write protection to the NVM. When write to the NVM
is required, pin 7 of the NVM must be pulled to logic ‘0’ first
(via Write_Protect of the micro-controller pin) before a write
is performed. Otherwise pin 7 of NVM must always be at
logic “1”
–
0: Disabled
– 1: Enabled (default)
• SOUND_ENABLE. This pin is use to MUTE the audio
amplifier. It is configured as push pull.
• STATUS_1. This signal is used to read the status of the
SCART 1 input.
• STATUS_2. This signal is used to read the status of the
SCART 2 input.
• HERC_RESET. This pin is use to switch the +1.8V supply.
• POWER_DOWN. The power supply generates this signal.
Logic “high” (3.3 V) under normal operation of the TV and
goes “low” (0 V) when the Mains input voltage supply goes
below 70 V
AC
.
• Keyboard. Following are the Keyboard functions and the
step values (8 bit) for it.
Table 9-2 Local keyboard values
• TV_IRQ. This signal is the interrupt from the Scaler IC.
• TV_SC_COM. This signal is used for the communication
with the Scaler IC.
• EXT_MUTE. This signal is used to reduce the Switch-off
plop.
9.10 Abbreviation list
0/6/12 SCART switch control signal on A/V
board. 0 = loop through (AUX to TV), 6
= play 16:9 format, 12 = play 4:3
format
1080i 1080 visible lines, interlaced
1080p 1080 visible lines, progressive scan
2CS 2 Carrier Stereo
480i 480 visible lines, interlaced
480p 480 visible lines, progressive scan
ACI Automatic Channel Installation:
algorithm that installs TV channels
directly from a cable network by
means of a predefined TXT page
ADC Analogue to Digital Converter
AFC Automatic Frequency Control: control
signal used to tune to the correct
frequency
AGC Automatic Gain Control: algorithm that
controls the video input of the feature
box
AM Amplitude Modulation
AP Asia Pacific
AR Aspect Ratio: 4 by 3 or 16 by 9
ASD Automatic Standard Detection
AV Audio Video
B-SC1-IN Blue SCART1 in
B-SC2-IN Blue SCART2 in
B-TXT Blue teletext
B/G Monochrome TV system. Sound
carrier distance is 5.5 MHz
BOCMA Bimos one Chip Mid-end Architecture:
video and chroma decoder
C-FRONT Chrominance front input
CBA Circuit Board Assembly (or PWB)
CL Constant Level: audio output to
connect with an external amplifier
CLUT Colour Look Up Table
ComPair Computer aided rePair
CSM Customer Service Mode
CVBS Composite Video Blanking and
Synchronisation
CVBS-EXT CVBS signal from external source
(VCR, VCD, etc.)
CVBS-INT CVBS signal from Tuner
CVBS-MON CVBS monitor signal
CVBS-TER-OUT CVBS terrestrial out
DAC Digital to Analogue Converter
DBE Dynamic Bass Enhancement: extra
low frequency amplification
DFU Directions For Use: owner's manual
DNR Dynamic Noise Reduction
DRAM Dynamic RAM
DSP Digital Signal Processing
DST Dealer Service Tool: special
(European) remote control designed
for service technicians
DTS Digital Theatre Sound
DVD Digital Video Disc
EEPROM Electrically Erasable and
Programmable Read Only Memory
EPG Electronic Program Guide: system
used by broadcasters to transmit TV
guide information (= NexTView)
EU EUrope
EXT EXTernal (source), entering the set by
SCART or by cinches (jacks)
FBL Fast Blanking: DC signal
accompanying RGB signals
FBL-SC1-IN Fast blanking signal for SCART1 in
FBL-SC2-IN Fast blanking signal for SCART2 in
FBL-TXT Fast Blanking Teletext
FLASH FLASH memory
Function
Voltage
(V
DC
)
Step values
(8 bit)
NAFTA Stand-by 0 0 - 6
Ch + 0.43 7 - 33
Exit Factory (Ch- and Vol-) 0.69 34 - 53
Ch - 0.93 54 - 73
Menu (Vol - and Vol +) 1.19 74 - 96
Vol - 1.49 97 - 121
DVD Eject 1.8 122 - 147
Vol + 2.12 148 - 169