Specifications

Circuit Descriptions, List of Abbreviations, and IC Data Sheets
EN 81L05U AA 9.
9. Circuit Descriptions, List of Abbreviations, and IC Data Sheets
Index of this chapter:
9.1 Introduction
9.2 2fH synchronisation
9.3 Source Select
9.4 Video Processing
9.5 Audio Processing
9.6 Abbreviation list
9.7 IC Data Sheets
Notes:
•Only new circuits compared to the L04U chassis are
described in this chapter. For the other circuit descriptions,
see the manual of the L04U chassis.
• Figures can deviate slightly from the actual situation, due
to different set executions.
• For a good understanding of the following circuit
descriptions, please use the diagrams in sections “Block
Diagrams, ...”, and/or “Electrical Diagrams”. Where
necessary, you will find a separate drawing for clarification.
9.1 Introduction
The "L05" chassis is designed for the model year 2005 and is
used for TV sets with large screen sizes (from 27 to 32 inch), in
Super Flat and Real Flat executions (both in 4:3 and 16:9
variants). This chassis is High Definition ready with a NTSC
tuning system.
There are three types of CRT, namely one with 100 degrees
deflection angle, one with 110 degrees and a Wide Screen
CRT.
In comparison to its predecessor (the L04), this chassis has the
following (new) features:
• High Definition (HD) signal processing: The chassis has
a special HD processing board.
• HDMI input: The chassis has a High-Definition Multimedia
Interface (HDMI) input.
The standard architecture consists of a Main panel (called
"family board"), a Picture Tube panel, a Side I/O panel, a HDMI
panel, a HD panel and a Top Control panel. The Main panel
consists primarily of conventional components with some
surface mounted devices in the audio and video processing
part.
The functions for the basic video and audio processing are
performed by one IC (TDA1200x, item 7200), the so-called
third generation Ultimate One Chip (UOC-III) or “Hercules”.
This chip is mounted on the “solder” side of the main panel, and
has the following tasks:
• Mono/stereo, audio switching and part of the video
switching.
• FM sound demodulation.
The CVBS-signal produced by the Hercules is supplied to the
HD panel. This panel converts the standard framerate (1fH)
NTSC CVBS-signal coming from the tuner and from the AV1
and AV2 inputs into a HD-signal with double framerate (2fH).
The HD panel also handles videosignals from the HDMI and
the CVI input (I/O panel).
All signals entering the TV set, be it NTSC signals from the
tuner or signals already in HD format from the HDMI I/O panel,
are displayed on the CRT in 1080i format. The HD panel
performs the following functions:
• Video processing (mainly by the Trident chip, IC7201).
• OSD processing.
• Closed caption / text processing
• A/D conversion (of analog signals coming directly from the
HDMI I/O panel).
The tuning system features 181 channels with on-screen
display. The main tuning system uses a tuner, a
microcomputer, and a memory IC mounted on the main panel.
The microcomputer communicates via the I
2
C bus with the
memory IC, the customer keyboard, the remote receiver, the
tuner, the signal processor IC, the HD processing section, and
the audio output IC. The memory IC retains the settings for
favorite stations, customer-preferred settings, and service /
factory data.
The on-screen graphics and closed caption decoding are done
within IC 7206 located on the HD panel. They are added to the
main signal in the display processor, IC 7221, also located on
the HD panel.
The chassis uses a Switching Mode Power Supply (SMPS) for
the main voltage source. The chassis has a 'hot' ground
reference on the primary side and a cold ground reference on
the secondary side of the power supply and the rest of the
chassis. For more information on the power supply, see the
L04 manual.
9.2 2fH synchronisation
The 2fH sync generation is done by the DPTV SVP (IC7201).
This IC converts the H and V sync signals (Hs and Vs) coming
from the UOC into 2fH sync signals (HSYNC and VSYNC)
which are outputted to the TDA9332 (HOP).
The HOP again generates the necessary deflection signals like
VD+ and VD- for the Frame deflection; HD for line deflection;
EW_DRIVE.
9.3 Source Select
This chassis has the following inputs in addition to the tuner RF
input:
• AV1: This is a composite video input.
• CVI: This is a Component Video Input, it can accept 480i,
480p, 720p or 1080i.
• AV2: This input can accept CVBS or S-Video.
• Side: This input can accept CVBS or S-Video.
• HDMI: This is a High-Definition Multimedia Interface, it can
accept 480p, 720p or 1080i video and audio in a digital
TMDS (Transition Minimized Differential Signal) format.
The audio/video source selection between the tuner, AV1, AV2
and Side is controlled via the Hercules. The selected signal is
fed to the HD panel which selects between the output of the
UOCIII, CVI, and the HDMI input.
The Audio/Video Source Select is one of the more complex
functions due to its diversity and complex switching. The Audio/
Video Source Select comprises the following components:
• The Hercules for Mono Audio and Video Source Selection.
• The HEF switch for Stereo Audio as well as Video
Selection.
9.3.1 Options
The option settings for the Source Selection can be found in
Option settings of the SAM mode. The Option settings for
Option 5 are as follows:
• Option Byte 5
– Bit 7: AV1
– Bit 6: AV2
– Bit 5: AV3
–Bit 4: CVI
– Bit 3: SVHS2
– Bit 2: SVHS3
– Bit 1: HOTEL MODE
–Bit 0:
L05U_AA_312278515051.book Page 81 Friday, March 4, 2005 10:42 AM