Read LG 55SL8500-ZA (CHASSIS:LD91K) Service Manual online
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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
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