LG Flatron M1717A Service Manual page 10

1. Power Supply Block (LIPS)
This Block Generates DC Voltage (5V,15V) to Main Control system from AC Power (100-240 V, 50/60 Hz, 1.0A)
Also it has the inverter function that converts input voltage to AC Rms value for the LCD lamp.
2. DC/DC Converter block
DC/DC Converter convert the input 5V,15V to proper 3.3V, 5V, 8V, 12V for Main control system.
For shooting heat trouble, we use the DC/DC converting IC
3. Audio Amplifier
This block is composed of TPA3005D2 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.
4. Audio / Video / IF Decoder / Scaler
This block is composed of LOC1 and peripheral devices.
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
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.
4) Scaler
This IC includes A/D Converter and LVDS Transmitter
This IC is directly Inputted Analog Signal and transmits it to LCD Module
5) Micom
This block controls each IC through IIC communication line.
5. LVDS Rx (DTC34LF86L) - (Not Include, 20LC1R-ZG Only apply)
It is composed of DTC34LF86L/THC63LVDF84B.
The LVDS Rx converts the LVDS data streams back into 24bits of CMOS/TTL data with
Falling edge or rising edge clock for convenient with variety of LCD panel controllers.
6. Switch IC (PI3V512QE)
It is composed of PI3V512QE.
This IC selects between D-sub RGB signal and LOC1 RGB signal, and it transmits the selected signal to video
signal processor.
7. TUNER
Micom controls this through IIC Line.
TUNER makes IF and transmits IF signal to LOC1.
DESCRIPTION OF BLOCK DIAGRAM
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