15LS1R (CHASSIS:LP68A) - LG TV Service Manual (repair manual). Page 19

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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.

Voltage regulator convert the input 5V,15V to proper  1.8V, 3.3V, 5V, 12V for
Main control system.
For shooting heat trouble, we use the voltage regulator IC.

This block is composed of YDA138-EZ 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.

This block is composed of LGE9655 and peripheral devices.

1) Video Decoder

This Block Selects input Video signals (like CVBS, Y/C, SCART RGB) and output LVDS/ TTL signal through
Scaler.
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 SIF.
The analyzed signals transmitted to audio amplifier.
On decoding, We can control signal like Bass, treble.

3) Scaler

This IC includes A/D Converter and LVDS Transmitter 
This IC is directly Inputted Analog Signal and transmits it to LCD Module

4) Micom 

This block controls each IC through IIC communication line.

It is composed of CS4352.
The CS4352 is a complete stereo digital-to-analog system including digital interpolation, fifth-order multi-bit
delta-sigma digital-to-analog conversion, digital de-emphasis, analog filtering, and on-chip 2 Vrms line-level
driver.

TUNER
Micom controls this through IIC Line.
TUNER makes CVBS/SIF and transmits CVBS/SIF signal to LGE9655.