Philips 26HF5473/10 Service Manual page 27

Circuit Descriptions, Abbreviation List, and IC Data Sheets
LED Light Emitting Diode; A semiconductor
diode that emits light when a current is
passed through it
L/L' Monochrome TV system. Sound
carrier distance is 6.5 MHz. L' is
Band I, L is all bands except for Band I
LS LoudSpeaker
LVDS Low Voltage Differential Signalling,
data transmission system for high
speed and low EMI communication.
M/N Monochrome TV system. Sound
carrier distance is 4.5 MHz.
M= 525 lines @ 60 Hz,
N= 625 lines @ 50 Hz
MOSFET Metal Oxide Semiconductor Field
Effect Transistor
MPEG Motion Pictures Experts Group. An
ISO/IEC body that has given its name
to an image compressing scheme for
moving video
MSP Multi-standard Sound Processor: ITT
sound decoder
MTV Mainstream TV
MUTE MUTE Line
NC Not Connected
NICAM Near Instantaneously Companded
Audio Multiplexing; This is a digital
sound system, mainly used in Europe
NTSC National Television Standard
Committee. Colour system used
mainly in North America and Japan.
Colour carrier
NTSC M/N = 3.579545 MHz,
NTSC 4.43 = 4.433619 MHz (this is a
VCR norm, it is not transmitted off-air)
NVM Non Volatile Memory; IC containing
data such as alignment values, preset
stations
O/C Open Circuit
ON/OFF LED On/Off control signal for the LED
OSD On Screen Display
OTC On screen display Teletext and
Control
PAL Phase Alternating Line. Colour system
used mainly in Western Europe
(colour carrier = 4.433619 MHz) and
South America (colour carrier PAL
M = 3.575612 MHz and PAL
N = 3.582056 MHz)
PC Personal Computer
PCB Printed Circuit Board (or PWB)
PIP Picture In Picture
PLL Phase Locked Loop. Used, for
example, in FST tuning systems. The
customer can directly provide the
desired frequency
Progressive Scan Scan mode where all scan lines are
displayed in one frame at the same
time, creating a double vertical
resolution.
PSU Power Supply Unit
PWB Printed Wiring Board (also called PCB
or CBA)
RAM Random Access Memory
RC Remote Control transmitter
RC5 or 6 Remote Control system 5 or 6, the
signal from the remote control receiver
RGB Red, Green, and Blue colour space;
The primary colour signals for TV. By
mixing levels of R, G, and B, all colours
(Y/C) are reproduced
RGBHV Red, Green, Blue, Horizontal sync,
and Vertical sync
ROM Read Only Memory
SAM Service Alignment Mode
LC4.3HE AA
S/C Short Circuit
SCART Syndicat des Constructeurs
d'Appareils Radiorécepteurs et
Téléviseurs; This is a 21-pin connector
used in EU, that carries various audio,
video, and control signals (it is also
called Péritel connector)
SCL Serial CLock Signal on I
SDM Service Default Mode
SD Standard Definition
SDA Serial DAta Signal on I
SDRAM Synchronous DRAM
SECAM SÉquence Couleur Avec Mémoire;
Colour system mainly used in France
and East Europe. The chroma is FM
modulated and the R-Y and B-Y
signals are transmitted line
sequentially. Colour carriers =
4.406250 MHz and 4.250000 MHz
SIF Sound Intermediate Frequency
STB Set Top Box: separate tuner/decoder
combined with e.g. a monitor, a TV set
or an audio/hifi system
SMPS Switched Mode Power Supply
SND SouND
SOPS Self Oscillating Power Supply
SRAM Static RAM
SSB Small Signal Board
STBY STandBY
SVHS Super Video Home System
SW Software or Sub woofer or Switch
THD Total Harmonic Distortion
TXT Teletext; TXT is a digital addition to
analogue TV signals that contain
textual and graphical information (25
rows x 40 columns). The information is
transmitted within the first 25 lines
during the Vertical Blank Interval (VBI)
uP Microprocessor
VA Vertical Acquisition
VL Variable Level out: processed audio
output towards external amplifier
VCR Video Cassette Recorder
VGA Video Graphics Array; 640x480 (4:3)
WD Watch Dog
WYSIWYR What You See Is What You Record:
record selection that follows main
picture and sound
XTAL Quartz crystal
Y Luminance signal
Y/C Y consists of luminance signal,
blanking level and sync; C consists of
chroma (colour) signal
YPbPr This is a scaled version of the YUV
colour space. Y= Luminance,
Pb/Pr= Colour difference signals B-Y
and R-Y, other amplitudes w.r.t. to
YUV
YUV Colour space used by the NTSC and
PAL video systems. Y is the luminance
and U/V are the colour difference
signals.
9. EN 27
2
C bus
2
C bus