EN 869.LC13ECircuit Descriptions, Abbreviation List, and IC Data Sheets
The PLL tuner UR1316 (with FM radio) delivers the IF-signal, 9.3Power Supply
via audio & video SAW-filters, to the multi-system TV processor
TDA888x (item 7301, also called BOCMA). This IC has the
following functions:7005
SW2
?Multi-system decoder.InverterControlled
by JagASM
?Video source- and record select.
?Colour decoder.
Panel Power
?RGB output.
?Sound demodulator.
12V12V
?Geometry control.Adapter7752 Main NVM
7206 Reset IC
?Picture improvement.
?Synchronisation.
5V
12V+5
7001
lm2596
The BOCMA has one input for the internal CVBS signal and SX-5.0+3V37118 Digital
7009SDRAM
two inputs for external CVBS or Y signals. It has only one LD1086S2300 DAC/IO
V337501 LVDS
chroma input so that it is not possible to apply two separate Y/
C inputs. The selection is made via the I2C-bus.SW1
Controlled
It has two independently switch able CVBS outputs for e.g. by Standby
From A10
TXT, Comb-filter, CVBS-monitor, or PIP (optional).+1V8
S2300 Digital
Two SCART-connectors are used: SCART1 is fully equipped 7006LM317SCore, PLL
and SCART2 is meant for VCR. Pin 10 of SCART2 is used for
3V3
Easylink (P50) and there is a possibility for Y/C in. The CVBS-7301
7118 Analog
out on pin 19 can be used for WYSIWYR (What You See Is LM1117MP
X-3.3
What You Record).
Internal video processing is done with YUV-signals. It also
handles the video control, geometry part, and the insertion of
the TXT/OSD RGB-signals. The video part delivers the RGB CL 36532073_079.eps
281103
signals to the Scaler panel.
The Scaler board can receive two video input signals: SDTV Figure 9-2 Block diagram power distribution.
(from BOCMA) or HD (from external HD source like DVD).
The SDTV and HD signals are first digitalised, after which they 9.3.1 External Power Adapter
enter the Fli2300. This component does de-interlacing, scaling,
and video processing.
The power source for the LC13 is an external AC/DC adapter
After the video processing, the digital data is send via a Low
(not repairable). The type and power of this adapter depends
Voltage Differential Signalling bus to the LCD panel. LVDS is on the screen size of the LCD panel and the rated audio output
used to improve data speed and to reduce EMI significantly. power. For the 13? and 15? versions, the same 12 V_dc adapter
is used. However, the 20? model uses an adapter with 24 V_dc
The microprocessor, called Painter (SAA55XX, IC7064), takes output.
care of the set control, error generation and analogue TXT/
OSD input- and output processing.
Specifications for 13? and 15? models:
The Painter, ROM, and RAM are supplied with 3.3 V, which is
Power: 12 V / 5 A
also present during STANDBY.
Type number: SA165A-1250V-3
The NVM (Non Volatile Memory) is used to store the settings,
Supplier: Sino American
the flash-RAM contains the set software and the DRAM
Ordering code: 3139 128 76811
(located inside the microprocessor) is capable for storing 10
Teletext pages.
Specifications for 20? models:
Power: 24 V / 5 A
The sound part is built up around the MSP34xx (Multi-channel
Type number: AD3591
Sound Processor) for IF sound detection, sound control and
Supplier: PI Electronic
source selection. Dolby decoding is also done by the MSP.
Ordering code: 3139 128 76771
Amplification is done via an integrated power amplifier IC
(AN7522 for 13? and 15? models, AN5277 for 20? models).
9.3.2 Internal Power Distribution
Power supply input is a DC voltage coming from an external
power adapter.For the internal power distribution, the following regulators are
used:
?Low power supply regulator LM2596T-5: working
frequency 150 kHz, switch current 3 A, max. input voltage
40 V, max. output voltage 5 V.
?Low power supply regulator MC34063A: working
frequency 24 - 42 kHz, switch current 1.5 A, max. input
voltage 40 V.
The supply voltages for the TV board are derived via three
MC34063A voltage regulators.
Standby: The STANDBY line (active ?low?) comes from the
microprocessor and pulls the gate of FET 7900 to ground when
activated. This will block the FET. Directly after this FET, a fuse
(1903) is located.
Power down: When the DC voltage from the external adapter
drops below a certain value, the POWER_DOWN line will
inform this to the microprocessor (active "low"). |
ACEC
