Philips 3122 785 14580, Руководство по обслуживанию

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Circuit Descriptions, Abbreviation List, and IC Data Sheets EN 107 FTP2.4E AA 9.
9. Circuit Descriptions, Abbreviation List, and IC Data Sheets
Index of this chapter:
9.1 Introduction
9.2 Abbreviation List
Note:
Only new (not recently published) circuits are described here.
As this chassis does not contain any really new circuits, use the
FTP2.2x manual for the circuit descriptions.
9.1 Introduction
This chassis contains, compared to its predecessor, the
following
new/changed features/components:
• Small Signal Board (SSB). Small layout changes and new
software to support the 720p feature.
• Dual Ambient Light inverter panels : To reduce the heat
dissipation and improve the efficiency, two separate CCFL
inverter panels are introduced in some models.
The chassis consists of a full sized SSB, a Power Supply, and
some smaller PWBs for Audio, I/O, and Control functions. The
main functionalities are:
•
Power Supply :
– For FHP displays, this is an LLC power supply, based
on the one used in the earlier plasma monitors (FMxx
chassis). This supply (single sided) is built up very
conventional, with hardly any surface mounted
components on the copper side.
– For SDI displays, this is a "black box" for Service
(board/module swap).
• SSB : Core TV functionalities, being TXT/control, video and
audio decoding, feature box, video featuring, and sync/
geometry control. The SSB is a high tech module (four
layer, 2 sides reflow technology, full SMC) with very high
component density and full shielding for EMC-reasons.
Despite this, it is designed in such a way, that repair on
component level is possible. To achieve this, attention was
paid to:
–
Clearance around surface mounted ICs (for replacing).
– Detailed diagnostics and fault finding is possible via
ComPair.
– Software upgrading (only for main software) is possible
via ComPair.
9.2 Abbreviation List
1080i 1080 visible lines, interlaced
1080p 1080 visible lines, progressive scan
2DNR Spatial (2D) Noise Reduction
3DNR Temporal (3D) Noise Reduction
AARA Automatic Aspect Ratio Adaptation:
algorithm that adapts aspect ratio to
remove horizontal black bars; keeping
up the original aspect ratio
ACI Automatic Channel Installation:
algorithm that installs TV sets directly
from 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
ANR Automatic Noise Reduction: one of the
algorithms of Auto TV
AR Aspect Ratio: 4 by 3 or 16 by 9
Artistic See OTC 2.5: main processor
ASF Auto Screen Fit: algorithm that adapts
aspect ratio to remove horizontal black
bars but without throwing away video
information
ATV See Auto TV
AUDIO_C Audio Centre
AUDIO_L Audio Left
AUDIO_R Audio Right
AUDIO_SL Audio Surround Left
AUDIO-SR Audio surround right
AUDIO_SW Audio Sub woofer
Auto TV A hardware and software control
system that measures picture content,
and adapts image parameters in a
dynamic way
B/G Monochrome TV system. Sound
carrier distance is 5.5 MHz. B= VHF-
band, G= UHF-band
B-SC1-IN Blue SCART1 in
B-SC2-IN Blue SCART2 in
B-TXT Blue teletext
CL Constant Level: audio output to
connect with an external amplifier
ComPair Computer aided rePair
CSM Customer Service Mode
CTI Colour Transient Improvement:
manipulates steepness of chroma
transients
CVBS Composite Video Blanking and
Synchronisation
CVBS-TER CVBS terrestrial
COLUMBUS COLour LUMinance Baseband
Universal Subsystem. IC performing
noise reduction and 2D/3D comb
filtering
DAC Digital to Analogue Converter
DBE Dynamic Bass Enhancement: extra
low frequency amplification
DDC Display Data Channel; is a part of the
"Plug and Play" feature
DFU Direction For Use: description for the
end user
D/K Monochrome TV system. Sound
carrier distance is 6.5 MHz. D= VHF-
band, K= UHF-band