Sharp LC-22LE240K Service Manual ▷ View online
17
LC-22LE240
0.1 General Block Diagram
0.1
.General Block Diagram
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LC-22LE240
0.2 MB62 Placement of Blocks
0.2
.MB62
Placement of Blocks
Mai
n IC
(U5
)
Tuner(T3
)
Nand Flash (U162)
SPI Flash
DDR2 RAM (U155)
LVDS
Connectors
DVD Connector
External Keyboard Touchboard
Power Connector
Satellite Tuner
Keypad
YPbPr
SAV
HP
USB
HDMI Connectors
VGA
SCART Connec tor
SP
D
IF
Out
Adapter DC Input
Speaker Con.
Led Con
Inv. Con
Sat Demod
CI Connector
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LC-22LE240
CIRCUIT DESCRIPTIONS
1
. TUNER(TU3)
A horizontal mounted and Digital Half-Nim tuner is used in the product, which covers 3
Bands(From 48MHz to 862MHz for COFDM, from 45.25MHz to 863.25MHz for CCIR CH).
The tuning is available through the digitally controlled I2C bus (PLL). Below you will find
info about the tuner.
In active antenna option, the following circuit are used. ANT_CTRL pin is controlled by
microcontroller. If ANT_CTRL is low, ANT_PWR will be low. If ANT_CTRL is high,
ANT_PWR will be high.
OVER_CUR_DETECT pin is a monitor for short circuit in antenna. OVER_CUR_DETECT
is low, ANT_CTRL will be low, so ANT_PWR will be low. Finally, short circuit protection is
done by circuits and microcontroller.
1.1. General description of Sony RE216:
The SUT-RE216 is designed for terrestrial TV (digital & analog) and digital cable
reception. It includes a full band tuner and a channel filtering for digital signals. It provides
a low IF output after channel filtering to drive a channel demodulator. Tuning, band
switching and initialization are made via an I2C bus
interface. The module is built on a low-loss printed
circuit board carrying all the components in a metal
housing frame with top and rear covers. The single
aerial connector is mounted on one frame side and all
other connections are made via pins at the bottom.
Features:
Full frequency range from 47 to 870 Mhz
Digital Platform (DVB-T/T2, DVB-C, ISDB-T & ATSC)
Analog platforms (PAL B/G/I/D/K, NTSC M & SECAM L/L’)
Low IF tuner concept
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LC-22LE240
Programmable channel Filter bandwidth
Fully I2C bus controlled
For Hybrid TV applications
---
Pinning Table
and Application Block Diagram of Tuner---
2. AUDIO AMPLIFIER STAGE WITH AZAD2102(U163, U164)
2.1. General Description
17MB62 uses two 2,5W Class D Mono Audio Amplifers for from 16” to 24” TVs.
AZAD2102B is a 2.9 Watts (max. can offer 3.0 Watts @ Load = 3Ω,THD=10%,
AVdd=DVdd=5.5Volt)with high efficiency filter-free class-D audio power amplifier in a
1613 mm x 1613 mm wafer chip scale package (WCSP). AZAD2102B uses Current-
switch technology to achieve high performance class-d amplifier that features 0.03%
THD, 85% efficiency, –70 dB PSRR, to improve RF-rectification immunity.
AZAD2102B provide a Vibration-Spectrum modulation clock for PWM Output. This
vibration frequency is around 10KHZ shift (+/- 5KHZ of Fpwm).
The advantage of the small size package (WCSP) makes AZAD2102B very suitable for
mobile phone and PDA device application. And the Class-D amplifier structure let
AZAD2102B to have highly efficiency power consumption than Class-AB amplifier.
AZAD2102B can shrink the application board, reduce system cost, and external
components.
ESD level protection I/O embedded in AZAD2102B. For general applications, doesn’t
need to add extra ESD protection device (like Varistors) in application system for
AZAD2102B’s I/O.
Programmable channel Filter bandwidth
Fully I2C bus controlled
For Hybrid TV applications
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