Description Of Block Diagram - LG flatron M1740A Service Manual

1. Format Converter (MST9883C)(U702)
This IC contain A/D converter, Pre-amp and PLL circuit that converting.
Analog video signal(0.7p-p RGB) to digital signal.(656 Format)
2. Power Supply Block (LIPS)
This Block Generates DC Voltage (5V,15V) to Main Control system from AC Power (100-240V, 50/60Hz, 1.0A)
The Minimum of Power efficiency is about 80%.
3. DC/DC Converter block
DC/DC Converter convert the input 5V,15V to proper 3.3V,5V,12V for Main control system.
For shooting heat trouble, we use the DC/DC converting IC
4. Audio Amplifier (TPA3004D2)(U201)
This block is composed of TPA3004D2 and peripheral device
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. Also, headphone amplifier (TPA6110) is
controlled through line-out.
5. Audio / Video / IF Decoder(U601)
This block is composed of VCT49xy and peripheral devices.
Micom controls this IC through IIC Line.
1) Video Decoder
This Block Selects input Video signals (like CVBS, Y/C, SCART RGB) and output RGB signal.
On decoding, We can control signal like Contrast, Brightness, Sharpness, Color, tint signals including Adaptive Comb
Filter.
2) Audio Decoder
This block analyzes audio input signal through A/V Jack and PC audio and Tuner IF.
The analyzed signals transmitted to audio amplifier (TPA3004D2)
On decoding, We can control signal like Bass, treble.
3) IF Decoder
This block can change IF signal to audio and video signal that transmitted to Video/audio decoder.
6.Video signal processor (Scaler IC) (U401)
It is composed of GM1501
Micom control this IC through IIC Line.
This IC include A/D converter for PC input and LVDS Transmitter.
This IC is directly inputted Analog and Digital Signal and transmits to LCD Module.
7. Micom (4M Flash Memory) (U403)
It is composed of AT49BV040A.
This IC controls peripheral devices through IIC line.
8. TUNER(TU802)
Micom controls this IC through IIC Line.
TUNER makes IF and transmits IF signal to VCT49xy.

DESCRIPTION OF BLOCK DIAGRAM

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