LG 55LK530 (CHASSIS:LT03B) Service Manual ▷ View online
5. HDMI block
TMDS1/2/3[8]
TMDS_OUT[8]
LGE35230
HDMI_I2C
CEC
FET
IC602
MICOM
UPD78F05 14
IC602
MICOM
UPD78F05 14
DDC_I2C_1/2/3
HPD
HDMI_HPD_1/2/3
HDMI_CEC
SIL9287B
HDMI 3x1 Switch
(IC3701)
SIL9287B
HDMI 3x1 Switch
(IC3701)
5V_HDMI_1/2/3
VDD[+5V]
EEPROM
ARC
(Audio Return Channel)
CEC_REMOTE
LGE35230
6. USB block
USB1
SIDE_USB_DP
SIDE_USB_DM
+5V_USB
USB_PORT1DP
USB_PORT1DN
USB_PORT1DN
USB PWR
Switch
(IC1204)
USB_PWRFLT_1
USB_PWRON_1
5V
USB2
WIFI_DP
WIFI_DM
+5V_USB
USB_PORT2DP
USB_PORT2DN
USB_PORT2DN
USB PWR
Switch
(IC1203)
+3.3V_Noraml
USB_PWRFLT_2
USB_PWRON_2
5V
+3.3V_Noraml
7. I
2
C Connections
LGE35230
LGE35230
CH1
CH2
CH3
I2C2_3.3V
I2C3_3.3V
CH0
I2C0_3.3V
ATSC
Tuner
Tuner
0xC2
ATSC
Tuner
Tuner
0xC2
HDMI Switch
SII9287B
0xB0
HDMI Switch
SII9287B
0xB0
NVRAM
M24M01
0xA8
NVRAM
M24M01
0xA8
MICOM
UPD78F0514
0x52
MICOM
UPD78F0514
0x52
AMP
TAS5727
0x54
AMP
TAS5727
0x54
1. Trouble shooting - No power
Check stand-by Voltage.
P501 9~12pin : +3.5V_ST
Check Power connector
Main B/D 3.5V Line
Short Check
Check X602 clock
32 KHz
Replace X602
Check P501 PWR_ON.
1pin : 3.3V
Replace Micom(IC602 ) or Main board
Check Multi Voltage
P501. 2 pin : *24V , 17 pin : 12V
Replace Power Board
Check Inverter Control
P501 18 pin : High
Check Power Board or Module
Check IC501/4/5/8 Output Voltage
IC501 : 0.9V, IC508 : 1.5V
IC504 : 2.5V ,IC505 : 3.3V
Replace IC501/4/5/8
Re-download Micom software.
Check Micom Voltage
IC602 pin 48 : +3.5V
Replace L503
Check LVDS Power Voltage
Q507 : 12V
Replace Q507
Change Module
ok
ok
ok
ok
ok
ok
ok
ok
ok
No
No
No
No
No
No
No
No
No
Check X101 Clock
54 MHz
Replace X101
ok
No
Replace Power board.
ok
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