LG RT-42LZ30, Руководство по обслуживанию

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BLOCK DIAGRAM DESCRIPTION
1. Input Selection Circuit
1) PC Input Selection
This block is composed of GM1501(U402) and peripheral
devices.
2) Video Input Selection
This block is composed of Video S/W IC(CXA2040Q,
U201) and peripheral devices.
There are three inputs in CXA2040Q IC(CVBS video signal
through RF Tuner, Video input CVBS,S-Video signal). One
selected video signal is transmitted a video decoder
IC(UPD64011,U904)
2. DDC controller
This block is composed of GM1501(U402) and peripheral
EEPROM IC(U114,U115).
GM1501(U402) controls peripheral devices through IIC
line.
Major functions are (1) to control Flash memory through
DDC-SCLA, DDC-SDAA of D-sub And (2) to store EDID
data in the EEPROM (U114, U115).
3. Video Decoder
This block is composed of UPD64011(U904) and
peripheral devices.
GM1501 controls this IC through IIC Line.
This IC analyzes input signal of CVBS, Y/C and output
analyzed signal (16bit interlace signal) to De-interlace
block. Analyzed signal has video control signals like
Contrast, Brightness, Sharpness, Color, tint signals
Including Adaptive Comb Filter.
4. Audio Decoder
This block is composed of MSP3410G (U501) and
peripheral devices.
GM1501 controls this IC through IIC Line.
This IC analyzes Audio input signal through A/V Jack and
PC audio.
The analyzed signals transmitted to audio amplifier
(TPA3004,U502).
5. Audio Amplifier
This block is composed of TPA3004(U502) and peripheral
devices.
The function of the audio amplifier is that to amplify audio
L/R signal transmitted from audio decoder.
The audio signal is amplified according to pre-defined DC
volume control curve.
6. De-interlacer
This block is composed of MDIN150(U901) and peripheral
devices.
GM1501(U402) controls this IC through IIC Line.
And this IC convert 16 Bit Interlaced Y/UV signal to De-
interlace signal.
It output converted signal to Format Converter IC
(GM1501,U402).
7. Format Converter
This block is composed of GM1501(U402) and peripheral
devices.
GM1501(Scaler,U402) contains MICOM.
1) This IC contain A/D Converter,Pre-amp and PLL circuit
that converting analog video signal(0.7Vp-p) through D-
sub(J101) Pin to digital signal.
2) This IC decode TMDS signals of 8 lines from DVI-D
Pin(J102) and transmit to LVDS Transmitter.
GM1501 is Format Converter IC that receives Digital signal
and outputs proper frame signal to LCD Module Timing
(1366x768,WXGA).
8. DC/DC Converter block
DC/DC Converters convert the input 12V, 24V to proper
2.5V, 3.3V, 5V, 8V for main control system.
For shooting heat trouble, we use the DC/DC converting
IC.
9. Teletext and Mixer Block
This block is composed of SDA555 (U1001) and the
peripheral devices.
The SDA555 IC receives a CVBS-TTX signal and it
converts it to the output RGB , which is converted to 24 bit
RGB by the ADC (MST9883, U1011) .
The Programmed FPGA IC (U1012) mixes Teletext
information which it receives from the MST9883 (U1011)
and video signal from the UPD64011 (U904) and sends to
De-interlace IC (U901)
10. Power Supply Block
This Block generates DC Voltages(5V, 12V, 18V and 24V)
to Main Control system from
AC Power(100-240 V, 50/60 Hz, 2.4 A).
This Circuit contains PFC(Power Factor correction) circuit.
The Minimum of Power efficiency is about 75%.