LG 42LK450 (CHASSIS:LA01U) Service Manual ▷ View online
Trouble shooting guide
10. Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.2V Power
IC3703 2 pin : 1.2V
Check CVBS Signal
TU3702
9
Pin
Replace IC3703 .
Check Tuner 5V Power
L3702
ok
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
Check
IC411
No
Replace
IC411
No
Replace L3702
ok
※ When the PCB is EAX63529602
IC411 is not available.
In this case, check IC406 is 5V or not
Trouble shooting guide
12. Component Audio
Check Component Cable
for damage or open conductor.
Check JK1601, JK1603
& Signal Line
ok
ok
No
Replace Jack
11. AV Audio
Check AV Cable for damage
for damage or open conductor
Check JK1604 , JK9001
& Signal Line
ok
ok
No
Replace Jack
Follow procedure
‘8. All source audio’
trouble shooting guide.
Follow procedure
‘8. All source audio’
trouble shooting guide.
13. RGB Audio
Check Cable conductors
for damage or open conductor
Check JK1104 & Signal Line
ok
No
ok
Replace Jack
Follow procedure
‘8. All source audio’
trouble shooting guide.
Trouble shooting guide
14. USB : movie, music, picture
Check USB Jack(JK1450)
signal differential line
- Jig points under USB jack
ok
No
Replace Jack
ok
Check L401, C405, C410, C489.
Is the voltage 12V?
Replace L401,C405,C410,C489
No
Check IC401 output.(7/8 pin)
Is the voltage switching?
ok
Replace IC401
No
Check C420.
Is the voltage 5V?
ok
Replace IC401 block’s components
- Refer circuit file
- Refer circuit file
No
Check IC1450 (5 pin)
- Is it high?
ok
No
The external USB device
may cause over current
problem.
may cause over current
problem.
Change USB device.
(memory stick or etc.)
(memory stick or etc.)
Replace IC1450
ok
No
Replace Mstar(IC100) or Main Board.
Check IC1450 output.(6/7 pin)
Is the voltage 5V?
ok
Check IC1450 (4 pin)
- Is it high?
No
Check L1451, C1451
Is the voltage 5V?
ok
Replace C1451,L1451
No
Check JK1450 pin1
Is the voltage 5V?
ok
Replace JK1450
No
Replace Mstar(IC100) or Main Board.
The problem may be caused by
USB device or file in it.
Change USB device.
USB device or file in it.
Change USB device.
No
DDR3 256M(1Gb)
667Mhz(1333) Hynix
H5TQ1G63DFR
RGB PC
SPDIF
Component
H/P OUT
HDMI(DVI)
Half
Half
NIM
NIM
(CAN)
(CAN)
PC/DVI Audi In
RS-232C
IF +/-
TU_CVBS
SIF
L/R
S7R
(S7MR)
※
LK520;S7MR
MAX3232
SERIAL FLASH (8M bit)
MX25L8006EM2I
X-tal
32.77K
LVDS
(FHD/HD, 60Hz/120Hz)
A. AMP
NTP7100
USB2.0
DP/DM
SPK L/R
X-tal
24M
I2S
SPDIF
H/P L/R
S7R / S7MR Block Diagram – LK models
L/R
CVBS, Y/Pb/Pr, L/R
RGB/H/V
RS232C
Rear
TMDS
DDR3 Add.
DDR3 Data
DDR3 Data
SPI
MICOM
UPD78F0514AGA
-GAM-AX
MICOM SDA
MICOM SCL
MICOM SCL
AV
Side
NAND Flash
(1Gbit)
H27U1G8F2BTR-BC
PCM_A[0:7]
FFC (30P – For HD)
TMDS
HDMI
CVBS, L/R
CONTROL
IR & LED /
SOFT TOUCH
NEC_EEPROM
_SCL/SDA
LED_R/BUZZ
KEY1
KEY2
IR
LED_B/LG LOGO
SOFT TOUCH
_SCL/SDA
SYSTEM EEPROM
M24M01-HRMN6TP
1Mbit
HDCP EEPROM
CAT24C08WI
I2C
MICOM EEPROM
M24C16-WMN6T
RGB EEPROM
AT24C16BN-SH-T
I2C
I2C
HDMI EEPROM
AT24C02BN-SH-T
I2C
DDR3 256M(1Gb)
667Mhz(1333) Hynix
H5TQ1G63DFR
DDR3 256M(1Gb)
667Mhz(1333) Hynix
H5TQ1G63DFR
HDMI EEPROM
AT24C02BN-SH-T
HDMI EEPROM
AT24C02BN-SH-T
FFC(51P – For FHD 60Hz, 120Hz)
FFC(41P - For FHD 120Hz)
(LK520, LK450, LK430 use this port)
(LK520 uses this port)
(LK330 uses this port)
※
LK520 model : DDR 3points. Others : DDR 2points
This block is applied in
LK450 only.
(Soft Touch model)
This block is applied in all models
except 26LK330, 32/42LK430
※
RGB / HDMI EEPROM is applied
multi item(AT24C16BN-SH-T or R1EX24002ASAS0A)
※
LK330 model : Rear component is 1 pare.