PRINTED CIRCUIT BOARDS AND FUNCTIONS.
A-BOARD [XS/WF/WE].
This board consists of the following 4 functional blocks.
- VIDEO: Sub RF Tuner, Audio/Video 5/6 Input terminals, Video switches and Sub YC separation circuit.
- AUDIO: Audio switch, Audio Processor, Dolby Prologic (Dolby Prologic is only for XS), and Woofer Filter
- SYSTEM: SIRCS, Control-S Selector and Control-S IN/OUT terminals
- POWER: DC-DC converters for 3.3V and 2.5V and a regulator for 1.8V.
B-BOARD [XS/WF/WE]
This board handles virtual all of the video signal
processing.
- Y/C separation of composite signal (from Tuners or Video Inputs)
- Luminance and chrominance processing
- HV-Sync signal process
- Noise reduction by CCP-X
- DRC processing for 480i inputs
- Scaling and multi-picture processing of MID circuit.
The B-board is a combination of DIC2 and C2 boards found in
the LA-2/2A without 3D-gamma IC, which is located on the C-board in the
optical-block on the LA-3 chassis.
Any input video signal is converted to the component signal
and sent to IC3502 (DCP), where the component signal is converted to RGB
signal.
The Menu/Service OSD signals from Q-Box is mixed in the
IC3502 (DCP) prior to the sending the signal to the C-board via Low Voltage
Differential Signal (LVDS).
The Wega-Engine (WE) Microprocessor controls all the previously
mentioned digital picture process functions, and the data is stored in the 128K
NVM IC3803 also located on the B-board.
Common functions such as AV switching and Sub YC
separation are controlled by the TV micro. The TV micro is powered by STBY3.3V
and STBY2.5V (on the B-board) converted from STBY5V from the F-board.
C-BOARD [XS/WF/WE]
- Gamma and uniformity correction of 3D-gamma IC are performed on this board.
- The board consists of the new 3D-gamma IC, 3 LCD Drivers, and a IC thermometer to measure LCD panel temperature.
For XS model, the chroma-process IC (Jepico) for better color
reproduction is also mounted.
- Picture quality settings, gamma/uniformity correction, and White Balance data is stored at the NVM on the C-board, together with the Display-Engine (DE) microprocessor data.
F-BOARD [XS/WF/WE]
- This board includes the AC fi lter, Main Fuse (F1900), Main Relay (RY1901), Inrush Current Relay (RY1900), and STBY Power Supply (STBY) circuit. The STBY circuit is always active when the AC power cord is plugged.
- During the STBY mode, only TV micro is powered to respond to user control (front panel and remote controls).
G-1 BOARD [XS/WF/WE]
This board includes the Main Power Supply and DC-DC Converter
for the Q-box module.
This board has the following 3 power status modes.
- OFF or STBY: In either case the “POWER-CTL” and “MAIN-CTL” are inactive.
- Cable Card STBY: Q-Box converter is activated to power the Qbox when CableCard is inserted. The “POWER-CTL” signal is active in this case to make the main relay.
- POWER-ON: Both of the “POWER-CTL” and “MAIN-CTL” signals are active.
G-2 BOARD [XS/WF/WE]
This board can be consisted the motherboard for the LA-3
chassis, to which almost all other boards and blocks are directly
connected. It consists of the following
2 function blocks.
- SYSTEM: Display-Engine (DE) Microprocessor, FAN Drivers and FAN controllers and WAKE-UP circuit.
- POWER: STBY 3.3V regulator for H boards (LED/IR Receiver) and WAKE-UP circuit.
DIGITAL BLOCK OR Q-BOX MODULE [XS/WF/WE]
This block handles ATSC tuner, NTSC Main tuner, and Memory
Stick interfaces and decode them into component video and analog audio signals.
The internal ATI microprocessor is the Main Microprocessor of
the LA-3 chassis.
The module houses the following 2 boards.
- QT: ATSC and Main NTSC RF Tuner (ATSC Tuner output is a component signal, Main Tuner output is a composite signal)
- QM: ATI microprocessor, MPEG2 Audio/Video decode, TS
Demultiplexer, Graphics (Xilleon226), CableCard PCMCIA and
Memory Stick interfaces
There are two types of AV outputs.
- Main Tuner composite video
- ATSC Tuner or Memory Stick component video.
KD BOARD [XS/WF/WE]
- S-master (digital audio) Processors and Digital Power ICs for speakers and woofer are located on this board. The audio mute and volume control functions are performed on the KD-board.
KM BOARD [XS/WF/WE]
- This board houses the Memory Stick slot and interface circuitry for the USB connection to the QM board in the Q-Box module. For the WF model the POWER switch is located on this board. For the WE model the IR receiver is located on this board.
P BOARD [XS/WF/WE]
- The High-Defi nition Multimedia Interface (HDMI) interface supplies digital component video and audio signals over a single connection. The digital signals are then decoded into analog component video and audio signals, which are sent to the A board for further processing. There are two HDMI inputs for XS model. The analog L/R inputs are for DVI signal source. The DVI connection only supplies video. Therefore, separate analog inputs are necessary.
U BOARD [XS/WF/WE]
- On this board is the audio and video 1/3/4 input terminals for the rear panel.
T BOARD [XS/WF/WE]
- The Lamp Cover Detection switch is mounted on this board.
H1 BOARD [XS/WF/WE]
- Channel UP/DOWN, Volume UP/DOWN and Input selection switches are located on this board.
H2 BOARD [XS/WF/WE]
- The Lamp, Timer, and Power LEDs are mounted on this board, along with the IR receiver for XS/WF models, and the POWER switch for XS/WE models.
H3 BOARD [XS/WF/WE]
- The Front panel connectors for Audio/Video 2 INPUT are mounted on this board.
- The IC thermometer, which measures ambient temperature is mounted on this board for the WE model.
H4 BOARD [XS/WF]
- The IC thermometer, which measures ambient temperature is mounted on this board for the XS and WF models.
