CIRCUIT VOLTAGE CHART
1. IC VOLTAGE
2. FAN MOTOR VOLTAGE
3. SMPS CAPACITOR & ZENER DIODE
3-45
3-46
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
NO.
SYMBOL
SPEC
(V, mV)
Rating -20 %
20 %
Measured Voltage
IC function
IC TC TEMPERATURE
SPEC
Voltage (V)
Voltage (V)
Description of operation
1
IC101
IC,Microcontrollers
VDD : -0.5~+6.5V
VDD : 3.1 ~ 3.3V
VDD : 3.29V
IC,Microcontrollers
125 °C
2
IC111
IC,Microcontrollers
VDD : -0.5~+6.5V
VDD : 3.1 ~ 3.3V
VDD : 3.28V
Sub IC,Microcontrollers
125 °C
3
IC201
DC,DC Converter
VIN : 4.5V TO 24V
Vin : 12VA,
Vout : 5.1VA
Vin : 12.01VA,
Vout : 5.15VA
High Ef
fi
ciency 3A, 24V, 500kHz
Synchronous Step Down Converter
125 °C
4
IC202
DC-DC Converter
VIN : 2.7V TO 5.6V
Vin : 3.3VA,
Vout : 3.3V
Vin : 5.15VA
Vout : 3.34VA
Step-Down Converters
125 °C
5
IC203
DC,DC Converter
VIN : 4.5V TO 24V
Vin : 12VA,
Vout : 5.1VA
Vin : 12.01VA,
Vout : 5.11V
High Ef
fi
ciency 3A, 24V, 500kHz
Synchronous Step Down Converter
125 °C
6
IC204
Limit Switch
VIN : 2.5V TO 5.5V
Vin : 5.1VA,
Vout : 5V
Vin : 3.34VA
Vout : 3.29V
ultra-low RDS(ON) switch
with current limiting
125 °C
7
IC205
DC-DC Converter
VIN : 2.7V TO 5.6V
Vin : 5.1VA,
Vout : 1.2VA
Vin : 5.14VA,
Vout : 1.22V
Step-Down Converters
125 °C
8
IC206
Limit Switch
VIN : 2.5V TO 5.5V
Vin : 5.1VA,
Vout : 5.0V
Vin : 5.1VA
Vout : 5.0V
ultra-low RDS(ON) switch
with current limiting
125 °C
9
IC207
Limit Switch
VIN : 2.5V TO 5.5V
Vin : 5.1VA,
Vout : 5V
Vin : 5.15VA
Vout : 5.14V
ultra-low RDS(ON) switch
with current limiting
125 °C
10
IC208
DC-DC Converter
VIN : 4.5V TO 5V
Vin : 5.1V
Vout : 3.3V
Vin : 5.14VA
Vout : 3.3V
Step-Down Converters
125 °C
11
IC209
Limit Switch
VIN : 2.5V TO 5.5V
Vin : 5.1A,
Vout : 5.0V
Vin : 5.1VA
Vout : 5.0V
ultra-low RDS(ON) switch
with current limiting
125 °C
12
IC301
4ch Audio ADC
VIN : -0.3V to 3.9V
AVDD : 3.3V
AVDD : 3.31V
4ch Audio ADCs
with Universal Front End Input Mux
125 °C
13
IC302
TUNER
VDD:3~3.6V
VDD:3.3V
AVDD:3.32V
Tuner ic
150 °C
14
IC304
OPTICAL
VDD:3~3.6V
VDD:3.3V
AVDD:3.32V
Optical
125 °C
15
IC400
Motor Driver
VCC1 : 4.3~13.2V
VCC2 : 4.3~VCC1
VCC1 : 5.0V
VCC2 : 5.0V
VCC1 : 5.11V
VCC2 : 5.11V
5-channel BTL Driver
150 °C
16
IC401
digital servo signal pro-
cessing
VDD1 : 2.7~3.6V (Analog)
VDD_CORE : 1.4~1.65V
VCC : 3.3V
VCC : 3.28V
Servo signal processor
for compact disc player
125 °C
17
IC501
IC,Digital Signal Proces-
sors
Digital Power 3.3V or 1.2V
VDD33 : 3.3VA
VDD12 : 1.2VA
VDD : 3.33VA
VDD : 1.21VA
IC,Digital Signal Processors
150 °C
18
IC502
SDRAM
VDD : 3.0~3.6V
VCC : 3.3V
VCC : 3.33V
4 M x 4 BANKS x 16 BITS SDRAM
150 °C
19
IC503
Serial Flash Memory
VDD : 3.0~3.6V
VCC : 3.3V
VCC : 3.33V
SERIAL FLASH MEMORY
150 °C
20
IC504
Serial Flash Memory
VDD : 3.0~3.6V
VCC : 3.3V
VCC : 3.33V
SERIAL FLASH MEMORY
150 °C
21
IC505
RESET
VIN:1.1~5.5V
Vin : 3.1~3.3VA
Vin : 3.32VA
3-PIN MICROPROCESSOR RESET
CIRCUITS
125 °C
22
IC601
Sound/Audio Processor
VCC : 2.97V TO 3.63V
VDD : 3.3V
VDD : 3.27V
Digital Audio Processor
125 °C
23
IC700~IC702
AUDIO AMPLIFIER
VCC : 11.6V To 12.4V
VDD : 11.68V
PVDD : 48.2V
VDD : 11.68V
PVDD : 48.2V
PROTECTED DIGITAL AUDIO
AMPLIFIER
125 °C
24
ICA301
Line Driver
VDD:3~3.6V
VDD : 3.3V
VDD : 3.32V
2-VRMS Audio Line Driver
With Adjustable Gain
150 °C
NO.
Check MODE
SPEC
Check Result
Check Method
1
FAN MOTOR
Input Voltage
12V
11.98V
Check the Voltage
on the CN462
Pin3(FAN_DC),
Not connect FAN
Module.(12V)
2
FAN MOTOR
Operation Voltage
VOL14
: 4.6~5.6V
VOL15~40 :
7.8~9.6V
VOL14
: 5.1V
VOL15~40 : 8.7V
During the FAN
Operate, Check
the Voltage of FAN
Module.
Capacitor
NO
LOC
SPEC
Sales AREA
1
C903
450V/
330uF
W/W
2
C904
450V/
330uF
W/W
SMPS ZENER DIODE
NO
LOC
CHECK
1
ZD902, ZD906
13V
2
ZD901, ZD904
33V
3
ZD905, ZD912
20V
