LG 55SL8500-ZA (CHASSIS:LD91K) Service Manual ▷ View online
- 26 -
26. AV2 No Audio Out Problem
Check the SCART Cable
YES
Replace MAIN B’D
IC1103
MAIN B’D
R250 (Right Sound)
R251 (Left Sound)
signal ?
NO
YES
Replace MAIN B’D IC 100
Speaker Audio OK
YES
Check MAIN B’D JK1101
Replace MAIN B’D JK1101
NO
YES
Check the Trouble Shooting Guide
Related to Audio Problem
NO
27. Headphone No Audio Problem
Check the Headphone Cable
YES
Replace MAIN B’D
IC702
MAIN B’D
R237 (Right Sound)
R238 (Left Sound)
signal ?
NO
YES
Replace MAIN B’D IC 100
Speaker Audio OK
YES
Check MAIN B’ D JK700
Replace MAIN B’D JK700
NO
YES
Check the Trouble Shooting Guide
Related to Audio Problem
NO
- 27 -
28. SPDIF No Audio Problem
Check the SPDIF Cable
YES
Check MAIN B’D R230
PWM Signal ?
Replace MAIN B’D IC 404
Speaker Audio OK
YES
Check MAIN B’ D JK403
Replace MAIN B’D JK403
NO
YES
YES
Check the Trouble Shooting Guide
Related to Audio Problem
NO
Replace MAIN B’D IC100
NO
29. USB No Connect Problem
Check MAIN B’D
JK405 Pin #1 5V ?
NO
Check MAIN B’D
L807 12V ?
Check that the USB Memory & HDD are supported by Spec
(Refer to User Manual's USB cautions)
YES
Check MAIN B’D
L821 5V ?
Replace MAIN B’D IC808
YES
NO
Replace POWER B’D
YES
YES
Replace MAIN B’D IC 100
Check MAIN B’ D
JK405 OK ?
YES
NO
Replace MAIN B’D JK405
30. Bluetooth “Connection on” Problem
Check Bluetooth B’D
P701 Pin #1 5V ?
NO
Check that the Bluetooth Device is supported by Spec
(Refer to User Manual ’ s Bluetooth cautions)
Check MAIN B’D
R748 5V ?
Check MAIN B’D P701
YES
YES
Replace Bluetooth B'D
Is possible Bluetooth “ on ”
on the Menu OSD
NO
YES
NO
Replace MAIN B’D IC100
Check Bluetooth Cable
If Devices should
be supported
be supported
Replace MAIN B'D IC100
YES
NO
Check MAIN B’D
L821 5V ?
Replace MAIN B’D Q702
YES
- 28 -
31. Remote Control Problem
Check IR B’D P100 Wafer
& Connector
Check MAIN B’ D P1304
Wafer & Connector
YES
YES
Replace IR B’D
IR B’D IC101 Pin #1, 3
Voltage 4V
- ?
YES
NO
Replace it
NO
Replace IR B’D IC101
NO
Replace MAIN B’D IC100
32. Intelligent Sensor Problem
Check IR B’D P100 Wafer
& Connector
Check MAIN B’D P1304
Wafer & Connector
YES
YES
Check IR B’D IC100
Pin #6 3.3V ?
NO
Replace it
YES
Replace IR B’D IC100
33. Intelligent Sensor Problem
Check IR B’D P100 Wafer
& Connector
Check MAIN B’D P1304
Wafer & Connector
YES
NO
Replace IR B’ D
YES
NO
Replace it
NO
Replace Soft-touch ass’y
Check IR B’D P101 Pin #4
Voltage 5V ?
NO
Replace IR B’D P101
AND Check 5V?
NO
Replace IR B’ D
YES
Check Soft-touch B/D
J2 Pin #6,7 KEY LEVEL
(TABLE A)
NO
Replace Soft-touch ass’y
2.25V
Ch+
1.6V
Ch-
0.85V
Vol+
0.2V
Vol-
2.25V
Enter
1.6V
Menu
0.85V
Input
0.2V
Power
TABLE A
Replace Soft-touch+ Middle bottom ass’y
And check the sensitivity
Of In-start menu
And check the sensitivity
Of In-start menu
Check Soft-touch B/D
J2 Pin #1.2 SCL,SDA
YES
YES
- 29 -
BLOCK DIAGRAM
Mstar
Saturn6
MSD3368
RGB
COMPONENT
F-SCART
H-SCART
AV3
BUF_TS_CLK/ERR/SYN/DATA[0]
AV_CVBS_IN
COMP_Y/Pb/Pr
SC1_CVBS_IN
SC2_CVBS_IN
DSUB_ R/G/B
74LVC541A
Buffer
CI Slot
FE_VMAIN
FE_TS_DATA[0:7]
->
CI_MDI[0:7]
SC1_R/G/B
FE
_V
OUT
DTV/MNT_VOUT
M
AX3232CDR
SPDIF
SPDIF_OUT
DSUB_H/VSYNC
CI_TS_DATA[0:7]
CI_Data[0:7]
<-
PCM_D[0:7]
PCM_A[8:14]
AUDIO IN (PC)
DGB_TX/RX
DDR2 SDRAM
(1GB)
HYNI
X
NAND Flash
HYNIX
(64MB)
USB
PCM_A[0:7]
SDDR_D[0:15]
TDDR_D[0:15]
SDDR_A[0:12]
MP6211DH
USBPower
USB Power
TDDR_A[0:12]
USB1_DM/DP
Serial Flash
For Boot
HDMI
1/2/3
Rear : 3
FRC
LGE7329
Module
TMDS351PAGR
TMDS[0:7]
HDMI_CEC
HPD
5V_HDMI
I2
C
Chip Tuner
(XC5000)
Demodulator
(DRC3931)
74LCX244
Buffer
PCM_A[0:7]
CI_ADDR[0:7]
LVDS
EEPROM
AT24C512
I2C
SPI_CK/CS/D0/D1
Side
AV
USB0_DM/DP
HDMI4
Side
(Head Phone)
RS-232C
DDR2 SDRAM
(512MB)
HYNIX
Digital
a
mp
(NTP3000A)
IC701
I2
S
L/R
TMDS[0:7]
HPD, 5V_HDMI
Audio
Switch
AUDIO Out
AUDIO Out
(B/T Headset)
1. T-project
Click on the first or last page to see other 55SL8500-ZA (CHASSIS:LD91K) service manuals if exist.