Description Of Block Diagram - LG Flatron M3200C Service Manual

1. INPUT SELECTION CIRCUIT
1) D-SUB RGB INPUT SELECT : This section is
composed of Signal selector IC(BA7657F_U121)
and peripheral devices.
The BA7657F(U121) IC select RGB1 signal or
RGB2 signal and the signal is sent to gm1501H
(U402).
2) VIDEO INPUT SELECT : This section is composed
of Video switching IC (CXA2040AQ_U201) and
peripheral devices.
Video switching IC(CXA2040AQ_U201) select
CVBS video or S-video and the signal is sent to
Video decoder (UPD64012)
3) DVI signal input is directly fed to SCALER,
DTV(Component1) signal input is given to Scaler
IC(U402) via MST9883C(U303) DVD(Component2)
signal input is given to Scaler IC via Video Decoder
IC(UPD64012_U801).
2. DDC COTROLLER
This section is composed gm1501H(U402),EEPROM
IC (U404, U115, U120) and peripheral devices.
gm1501H(U402) is controlling peripheral devices
through IIC Line.
Major functions of this block are :
(1) Controlling of u-COM and Flash memory through
DDC-SCLA, DDC-SDAA of D-sub connector.
(2) Storage of EDID DATA in the EEPROM(U115,
U120).
3. ANALOG DIGITAL CONVERTER
This section is composed of MST9883C(U303) and
peripheral devices.
gm1501H(U402) is controlling MST9883C through IIC
Line.
This IC is converting DTV(YPbPr) signal in to 16 bit
Interlace signal and the signal is sent to De-interlace
IC(MDIN150L_U901)
This output signal have CONTRAST, BRIHTNESS,
SHARPNESS, COLOR, TINT information.
3. VIDEO DECODER
This section is composed of UPD64012(U801) and
peripheral devices.
gm1501H(U402) is controlling UPD64012 through
IIC Line.
This IC is controlling CVBS input signal ,S-VIDEO(Y/C)
input signal and DVD(YCbCr) input signal and
converting input signals in to 16 bit interlace signal and
the signal is sent to De-interlace IC(U901).
This output signal have CONTRAST, BRIHTNESS,
SHARPNESS, COLOR, TINT information.
4. DE-INTERLACER
This section is composed of MDIN150L(U901) and
peripheral devices.
gm1501H(U402) is controlling MDIN150L through IIC
Line.

DESCRIPTION OF BLOCK DIAGRAM

This IC is converting 16bit interlace input signal in to
16bit De-interlace signal and the signal is sent to
Video Signal Processor IC(gm1501H_U402).Ä
5. AUDIO DECODER
This section is composed of MSP3420G(U501) and
peripheral devices.
gm1501H(U402) is controlling MSP3420G through IIC
Line.
This IC is processing audio signal output of A/V Jack,
PC Audio Jack.
This IC's output signal is sent to Audio Amplifier
IC(TPA3004_U502).
6. AUDIO AMPLIFIER
This section is composed of TPA3004(U502) OR
TPA3001(U507) and peripheral devices.
Audio Amplifier's function is amplification of sound
signal received from Audio Decoder.
Input Audio signal is amplified according to the DC
Volume control curve.
7. VIDEO SIGNAL PROCESSOR (FORMAT CONVERTER)
This section is composed of gm1501H(U402) and
peripheral devices.
gm1501H(SCALER_U402) have in built u-COM in IC.
(1) This IC include A/D Converter, Pre-Amp, PLL
Circuit.
(2) This IC include TMDS Receiver and LVDS
Transmitter.
TMDS Receiver is decoding input DVI Signal and
LVDS Transmitter is encoding the output Signal .
also, gm1501H have Format Converter (Scaling)
function.
This IC convert Various sized Digital signal to LCD
Module's resolution (WXGA).
8. DC/DC COVERTER
DC/DC Converters change Power output voltage (DC
5V, 12V, 24V) to 1.5V, 2.5V, 3.3V, 5V, 8V, 9V.
(To be used by different IC on the main board.)
9. TEMPERATURE SENSING AND FAN CONTROL
This section is composed of LM35DT(U523),
KIA358F(U524) and peripheral devices.
The temperature at surface of LM35DT(U523) is
sensed and converted to HEX code by KIA358(U524).
gm1501H(U402) receives sensing HEX values from
KIA358F(U524)and control FAN(42INCH ONLY).
10. POWER SUPPLY BLOCK
Power supply receives AC voltage (100-240 V, 50/60
Hz,) and converts to System voltage that are 5V, 12V,
18V and 24V DC voltage.
These voltages supports main board, inverter board
and module;s T-con board.
This Circuit contains PFC(Power Factor Correction)
circuit.
The Minimum Power efficiency is about 75%.
- 10 -