LG 42SL90QR-MA (CHASSIS:LP91L) Service Manual ▷ View online
No Sound
Check The Input Sourse
Check The Input/Output
Of IC600
Re-soldering or
Change the defect part
Fail
Pass
Pass
Check The Speaker
Change Speaker
Fail
Check The Speaker Wire
Pass
Change The Source Input
Fail
SL90 Series
Block Diagram
SL90 Series
RGB_PC
PC_Audio
TV
(RF)
(RF)
COMP1
HDMI1
HDMI2
HDMI3
HDMI2
HDMI3
RS232
TX
232C Driver
ST3232C
Tx/Rx : ±15Vpp
PC_R/G/B/HS/VS
PC_Audio_L/R :
700mVrms
MNT_VOUT
:
1Vpp
L_SPK_OUT
R_SPK_OUT
EEPROM
24C02
Comp1_L/R :
500mVrms
TUNER
AV1_VIN
:
1Vpp
AV1_LIN/RIN :
500mVrms
PWM
NTP3100L
MNT_OUT
MNT_LOUT/ROUT
:
500mVrms
MAIN SCALER
LGE376xA
TXD /RXD :
5V Digital
COMP1_Y/Pb/Pr
:
1/0.7Vpp
COMP2_Y/Pb/Pr
:
1/0.7Vpp
IR
HDMI_DATA_1
HDMI_DATA_2
DDC_SCL2/SDA2
TU_MAIN
S I F
COMP1_Y/Pb/Pr
:
1/0.7Vpp
AV1_VIN
PC_Audio_L/R
COMP1_LIN/RIN
L_CH
R_CH
FRC LVD
S
co
nn
e
c
tor
TU_MAIN
M_SCL/SDA
EEPROM
24C02
SIF
AV1_LIN/RIN
MNT_L/R OUT
AV1
MNT_OUT
Comp2_L/R :
500mVrms
COMP2_Y/Pb/Pr
:
1/0.7Vpp
COMP2_LIN/RIN
COMP2
PC_R/G/B/HS/VS
DDC_SCL1/SDA1
DSUB_SCL/SDA
MNT_VOUT
IIS_OUT
USB
USB_DP/DN
AUDIO
AMP
DDC_SCL3/SDA3
HDMI_DATA_3
TMDS
TMDS
TMDS
TMDS
EEPROM
24C02
FULL
HD LVD
S
co
nn
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c
tor
FRC IC
LGE7329A
URSA_[C~D]
URSA_[A:B]
OPC_EN
DDR2 SDRAM
(2*256MB)
Serial Flash
PSU
RL_ON/I-DIMMING/DISP_EN
PANEL_STATUS
E-DIM
OPC_OUT
Bluetooth
Circuit
BLT_DP/DN
DDR2 SDRAM
(512MB)
EEPROM
(256K)
(256K)
Serial Flash
(8MByte)
(8MByte)
EEPROM
for HDCP
(8K)
for HDCP
(8K)
EEP_SCL/SDA
EEP_SCL/SDA
MEMC_RXE2±
MEMC_RXE4±
MEMC_RXC3±
MEMC_RXC±
MEMC_RXE1±
MEMC_RXE0±
MEMC_RXO2±
MEMC_RXO4±
MEMC_RXO3±
MEMC_RXOC±
MEMC_RXO1±
MEMC_RXO0±
EEPROM
24C02
M_SCL/SDA