Power Supply - Philips LC03E Service Manual

EN 104 9.
The PLL tuner UR1316 (with FM radio) delivers the IF-signal,
via audio & video SAW-filters, to the multi-system TV processor
TDA888x (item 7301, also called BOCMA). This IC has the
following functions:
•
Multi-system decoder.
•
Video source- and record select.
•
Colour decoder.
•
RGB output.
•
Sound demodulator.
•
Geometry control.
•
Picture improvement.
•
Synchronisation.
The BOCMA has one input for the internal CVBS signal and
two inputs for external CVBS or Y signals. It has only one
chroma input so that it is not possible to apply two separate Y/
C inputs. The selection is made via the I2C-bus.
It has two independently switchable CVBS outputs for e.g.
TXT, Comb-filter, CVBS-monitor, or PIP (optional).
Two SCART-connectors are used: SCART1 is fully equipped
and SCART2 is meant for VCR. Pin 10 of SCART2 is used for
Easylink (P50) and there is a possibility for Y/C in. The CVBS-
out on pin 19 can be used for WYSIWYR (What You See Is
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
signals to the Scaler panel.
The Scaler board can receive three video input signals: SDTV
(from BOCMA), HD (from external HD source like DVD), or PC
(from external computer).
The SDTV and HD signal are first digitalised, after which they
enter the Fli2300. This component does de-interlacing, scaling,
and video processing. The PC signals are processed in the
JagASM scaler chip. This chip does noise reduction, de-
interlacing, motion adaptation, and Frame Rate Conversion on
the PC signals.
After the video processing, the digital data is send via a Low
Voltage Differential Signalling bus to the LCD panel. LVDS is
used to improve data speed and to reduce EMI significantly.
There are two I2C lines and one parallel addressing line (MCA)
for the Scaler control. SCL-1 and SDA-1 are the
communication lines between the TV-board (=Painter) and the
Scaler board. Herewith is the Scaler microprocessor the
master. The TV-IRQ signal is normally "high". Whenever the
Painter needs to communicate with the Scaler microprocessor,
it will pull the TV-IRQ line "low".
The JagASM is not an I2C device. The Scaler microprocessor
controls directly this chip via a dedicated parallel bus (MCA).
The microprocessor, called Painter (SAA55XX, IC7064), takes
care of the set control, error generation and analogue TXT/
OSD input- and output processing.
The Painter, ROM, and RAM are supplied with 3.3 V, which is
also present during STANDBY.
The NVM (Non Volatile Memory) is used to store the settings,
the flash-RAM contains the set software and the DRAM
(located inside the microprocessor) is capable for storing 10
Teletext pages.
The sound part is built up 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 an integrated power amplifier IC
(AN7522 for 15" and 17" models, AN5277 for 23" models).
Power supply input is a DC voltage coming from an external
power adapter.
LC03E Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.3

Power Supply

Inverter
12V 12V
Adapter
5V
12V +5
7001
lm2596
SX-5.0
SW1
Controlled
by Standby
From A10
Figure 9-2 Block diagram power distribution.
9.3.1
External Power Adapter
The power source for the LC03 is an external AC/DC adapter
(not repairable). The type and power of this adapter depends
on the screen size of the LCD panel and the rated audio output
power. For the 15" and 17" versions, the same 12 V_dc adapter
is used. However, the 23" model uses an adapter with 24 V_dc
output.
Specifications for 15" and 17" models:
Power
Type number
Supplier
Ordering code
Specifications for 23" models:
Power
Type number
Supplier
Ordering code
9.3.2
Internal Power Distribution
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.
7005
SW2
Controlled
by JagASM
Panel Power
7753 CPU
7754 Flash
7752 Main NVM
7202 DDC NVM
7201 DDC/Alignment
7206 Reset IC
7118 Digital
+3V3 AD9883 Digital
7009
SDRAM x3
LD1086
S2300 DAC/IO
V33
7751 Add Latch
7755 Line Decoder
7203 Sync Buffer
7501 LVDS
7402 JagASM I/O
+1V8
S2300 Digital
7006
Core, PLL
LM317S
3V3
7301
7118 Analog
LM1117MP
X-3.3
+3V3
7251 AD9883 PLL PVD
LM1117MP AD9883 Analog
X-3.3
2V5
JagASM
7008
Digital
LM317S
2V5I/II
JagASM
7007
Analog
117-2.5
CL 36532023_079.eps
140403
: 12V / 5 A
: SA165A-1250V-3
: Sino American
: 3139 128 76811
: 24V / 5 A
: CD3591
: PI Electronic
: 3139 128 76771