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9.
EM5.2E AA
9. Circuit Descriptions, Abbreviation List, and IC Data Sheets
Index of this chapter:
9.1 Introduction
9.2 Block Diagram
9.3 Feature Box
9.4 PICNIC
9.5 FEM (Falconic Embedded Memory)
9.6 Eagle
9.7 Abbreviation list
9.8 IC Data Sheets
Note:
•
Only new circuits, compared to its predecessor the
EM5.1E, are described here. For the other circuit
descriptions (e.g. the large signal part), see the EM5.1E
manual (available under order code 3122 785 13420).
•
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 chapter 6 and 7.
Where necessary, you will find a separate drawing for
clarification.
9.1
Introduction
This chassis contains, compared to its predecessor, the
following new feature/component:
•
FEM (Falconic Embedded Memories): is a new Falconic
with internal Field memories and jagged line removal.
The chassis consists of a full sized LSP/SSP combination and
a smaller double sided four layer SSB, which is mounted on the
SSP using a 80-fold SIMM connector. The main functionalities
are:
•
LSP: supply, deflection, and sound amplification.
•
SSP: tuner input, SIMM interface, I/O, and interface
provisions for extended functions such as PIP.
•
SSB: core TV functionalities, being TXT/control, video and
audio decoding, feature box, video featuring, and sync/
geometry control.
The LSP (single sided) is built up very conventional, with hardly
any surface mounted components on the copper side. Similar
with the EM3 (but different as with the MG-chassis), the EM5
LSP has a very large 'hot' part, including both deflection coils.
The SSB is a high tech module (four layer, 2 sides reflow
technology, full SMC) with very high component density and
complete 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:
•
The position of service test lands: most of them are at the
Tuner side.
•
Accessibility (Tuner side). If there are still problems with
the accessibility, one can order an extension board (see
parts list).
•
Clearance around surface mounted ICs (for replacing).
•
Detailed diagnostics and fault finding is possible via
ComPair.
The availability of Double Window (DW) or Picture In Picture
(PIP) depends on the model range. There are two different
executions, depending on the number of tuners:
•
One Tuner: The TV has only one tuner (on the LSP), so the
PIP-picture can be either from this tuner or from an external
AV-source.
•
Two Tuners: In this case there are two separate tuners, so
the main picture and the DW picture are independently
selectable. The IF signal from the main tuner is processed
on the SSB, while the IF signal from the second tuner is
processed by a second BOCMA video processor on the
Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.2
DW-panel. The source selection is done via an I/O
expander.
Block Diagram
For the block diagram see chapter 6 "Wiring Diagram, Block
Diagrams, and Overviews".
The Tuner (item 1200) is a PLL tuner and delivers the IF-signal,
via audio & video SAW-filters, to the HIP (High-end Input
Processor). The HIP has the following functions:
•
IF modulation.
•
Video source- and record select.
•
Colour decoder.
•
Synchronisation.
Attached to the HIP is the 2D Comb filter is used to separate
chroma and luminance components out of a CVBS signal.
Three SCART-connectors are available:
•
SCART1 is fully equipped,
•
SCART2 is meant for VCR. Pin 10 is used for Easylink
(P50) and there is a possibility for Y/C in. The CVBS-out on
pin 19 is meant for WYSIWYR (What You See Is What You
Record).
•
SCART3 (if available) is a RGB/CVBS and audio L/R input.
It can be used as second tuner input, in case of a 1-Tuner
DW/PIP set.
After the HIP, we come to the part that is called the Feature box
(diagram B3x):
•
For Digital Scan, the PICNIC is required.
•
For Natural Motion, the FALCONIC (or FEM) is required.
•
For Pixel Plus, the EAGLE is required.
The HIP delivers YUV and sync signals to the PICNIC. This IC
takes care of:
•
Analogue to Digital conversion and vice versa.
•
50 to 100 Hz conversion.
•
Panorama mode.
•
Noise reduction.
•
Dynamic contrast.
After the PICNIC, the (now 2fH) YUV-signals are fed to the
FALCONIC (or FEM) for "Natural Motion" followed by the Eagle
for "Pixel Plus" enhancement. The processed YUV signals
(from Eagle or PICNIC) are, together with the sync-signals from
the PICNIC, then fed to the HOP (High-end Output Processor).
This IC handles the video control and geometry part. The RGB-
signals for TXT/OSD (from the microprocessor) are also
inserted via the HOP. The video part delivers the RGB signals
to the CRT-panel and the geometry part delivers the H-drive, V-
drive, and a drive-signal for rotation.
Both deflection circuits are "hot" and located on the LSP. They
are driven by the HOP. To make a galvanic separation, the Line
Drive is driven via transformer 5410 and the Frame Drive via
transformer 5621.The horizontal output stage generates some
supply voltages and the EHT-, focus- and Vg2-voltages.
The RGB amplifiers on the CRT-panel are supplied with 200 V
from the LOT.
The Scavem circuit modulates transitions of the Luminance (Y)
signal on the horizontal deflection current, giving a sharper
picture.
The sound part is built around the MSP34xx (Multi-channel
Sound Processor) for IF sound detection, sound control and
source selection. Dolby decoding is also done by the MSP.
Amplification is done via a "class D" integrated power amplifier
IC, the TDA7490.
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