LG 55LK530 (CHASSIS:LT03B) Service Manual ▷ View online
Check SPDIF Cable
Check JK3802
SPDIF_OUT Signal(5V)
ok
No
Replace Jack
14. Trouble shooting - No audio (SPDIF)
ok
Replace IC101
15. Trouble shooting - No audio (Head phone audio out)
Check Head phone Cable
for damage or open conductor
ok
ok
Check Earphone AMP Mute
(Pin 13)
Check Audio OSD
(Audio OSD active or inactive mode?)
Check R3816 & R3858, JK3803
No(active)
Check Earphone output
(Pin 5, 16)
ok
No
Replace IC3804 TPA6132A2
ok
Follow procedure & refer to Audio signal block
Diagram
16. Trouble shooting - USB connection error
Check USB 2.0 Cable
N
Check USB jack
(JK1201 or JK1202)
Y
N
N
Check USB device
If device is 2.5 inch HDD,
Check power adaptor
Replace Jack
Check 5V voltage level at Bead or Jack
Y
Replace one of
IC1203 or IC1204 and then check
N
Maybe LGE35230(IC101)
has problems. Replace It.
has problems. Replace It.
• Exception
- USB power could be disabled by inrushing current
- In this case, remove the device and try to reboot the TV (AC power off/on)
17. Trouble shooting - Ethernet connection error
Replace one of L3901
& Recheck
N
Check LAN Port Power
L3901
Y
Check LAN Port LED
N
Replace one of LAN Port
& Recheck
Y
Maybe LGE35230 LAN PHY block
has problems. Replace It
N
Check LAN Cable
Recheck
LAN Cable
N
Y
Check MAC Address
Replace
Main B/D
N
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