LC-42SD1E (serv.man5). Major IC Informations - Sharp TV Service Manual (repair manual). Page 2

     LC-42SD1E/RU

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KD604FM (AV UNIT)
IC301
IC302

Sound Amp

VHiTDA8931T-1Y

The TDA8931 is a switching power stage for high efficiency class-D audio power amplifier 
systems.
With this amplifier a compact 1x 20 W closed loop self-oscillating digital amplifier system can 
be built.
In this model, Audio amplifier is 10watt.

CA193WJ (POWER UNIT)
IC705

Switching 
Regulator

VHiMR4020++-1

This IC is a power supply for the switching regulator on the primary side. 
Overvoltage/overcurrent protection circuit, other protection circuits and control circuits are 
built in this IC.   

IC704

Switching 
Regulator

VHiMR4030++-1

This IC is a power supply for the switching regulator on the primary side.
Overvoltage/overcurrent protection circuit, other protection circuits and control circuits are 
built in this IC.   

KD628FM (DIDGITAL UNIT)
IC4001

DTV-PROCES-
SOR

RH-iXB680WJZZQ

This is a video/audio signal processing IC (Digital Processor) (STi5516) for digital tuner, 
which has been manufactured by STMicroelectronics, and incorporates a CPU. In this equip-
ment, it implements GUI processing and video/audio processing for digital tuner, negotiation 
processing with CI-CARD, etc.

IC4201

64M-SDRAM

RH-iXB742WJZZQ

This IC is 64Mb SDRAM (static dynamic random-access memory) IC.
In this equipment, it is used for SMI memory (for image processing), and data is used for 
operation of the digital processor.   

IC4202

64M-SDRAM

RH-iXB742WJZZQ

This IC is 64Mb SDRAM (static dynamic random-access memory) IC.
In this equipment, it is used for EMI memory (generally for CPU), and data is used for opera-
tion of the digital processor.

IC4203

16Mbit-FLASH

RH-iXB681WJZZQ

This IC is a high performance CMOS super technology 16Mbit Flash Memory.
Start software (loader) for the CPU with a built-in digital processor and application software 
have been written on this Flash Memory.
The digital processor reads these softwares on start-up and implements them.

IC4402/05

RATCH-3 
STATE

VHiLVC573AP-1Y

This is a RATCH-3 STATE output IC. In this equipment, it is used to establish negotiation 
communication with CI-CARD.

IC4401

BALANCE 
TRANCEIVER

VHiTCLCX245-2Y

This IC is a low voltage (3.3V) CMOS 8bit bidirectional transceiver. When setting the trans-
mission direction change input DIR to “H”, the A bus is switched to input and the B bus is 
changed to output; if the DIR is set to “L”, the B bus is switched to input and the A bus is 
changed to output. When setting the enable input OE to “H”, both A and B buses enter the 
high impedance state. In this equipment, it used to switch bus of the data from CICARD. 

IC4404

Buffer/Line 
Driver

VHiLCX244MT-1Y

This lC is fabricated with an advanced CMOS technology to achieve high speed operation 
while maintaining CMOS low power dissipation. 
In this equipment, it is used to control negotiation communication with CI-CARD.

IC4604

3-OP-AMP

VHiTSH73CPT

This IC is a Triple operational amplifiers featuring high video performances with large band-
width, low distortion and excellent supply voltage rejection. In this equipment, it is used to 
convert audio output signal of the digital processor to normal analog signal level and to 
buffer it.

KD609FM (D-TUNER UNIT)
IC201

IF-
Demodurator/
PLL

VHiTDA9886+-1Y

The TDA9886 is an alignment-free multistandard (PAL, SECAM and NTSC) vision and 
sound IF signal PLL demodulator for positive and negative modulation in cluding sound AM 
and FM processing.

IC202

COFDM Demod 
IC

RH-iXB682WJZZQ

This is a COFDM (Coded Orthogonal Frequency Division Multiplex) Demodulator IC. In this 
equipment, IF signal from the digital tuner is decoded to MPEG-2 signal, and it is digitally 
output. Output signal is fed to the digital processor to implement video/audio decode pro-
cessing. This IC is used for digital signal is fed to the digital processor to implement video/
audio decode processing. This IC is used for digital tuner only.