Description Of Block Diagram - LG FLATRON L172WT Service Manual

1. Input Signal Part
It is composed of four parts.
-PC signal input part:24pin DVI-I and PC Audio input
jack.
-AV Video input part: RCA Jack (CVBS signal), S-Video
Jack
-HDTV input part : YPbPr Jack and RL Stereo Audio
input jack
-TV signal input part: TV Tuner input Connector (TV
signal)
2. Video Signal Processor
It is composed of GM1501(U402)
GM1501 includes A/D Converter and LVDS Transmitter
GM1501 is directly Inputted Analog and Digital Signal
or Video Signal from Video Decoder
This Signal is converted into compatible Signal by
MICOM's control and then GM1501 transmit it to LCD
Module.
3. Analog Switch
It is composed of BA7657F
BA7657F Switch DVI-A to HDTV
4. Micom Controller
It is composed of 29LV040B(U403) its functions is
controlling each IC, display mode and frequency
through EEPROM and IIC communication.
5. Video decoder.
This block is composed of VPC3230D (U203) and
peripheral devices.
This IC analyzes input signal of CVBS, Y/C and output
analyzed signal (8bit interlace signal) to Video Signal
Processor block.
Analyzed signal has video control signals like Contrast,
Brightness, Sharpness, Color, tint signals Including
Adaptive Comb Filter.

DESCRIPTION OF BLOCK DIAGRAM

6. Audio decoder part.
This block is composed of MSP3420G (U503) and
peripheral devices.
This IC analyzes Audio input signal through A/V Jack
and PC audio.
And output the analyzed signals to Audio Amplifier
(TPA3004).
7. Audio Amplifier
This block is composed of TPA3004 (U505) and
peripheral devices.
It amplifies audio signal input from Audio Decoder and
output amplified audio signal to Speaker, Audio Output
Jack.
8. Control
It receives outer key input, transmits the input to
Micom(U403).
There is key input part and remote controller receiver.
9. LIPS Part
It is composed of two parts
- Power Part functions that Input power converts to
33V,12V,5V power for operating circuits.
- Inverter Part functions that Input Power converts to
compatible "Vrms" value for operate LCD lamp.
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