LG 55LW5600 (CHASSIS:LA12C) Service Manual ▷ View online
Check Cable conductors
for damage or open conductor
Check JK804 & Signal path
ok
No
ok
Replace Jack or components
Follow procedure
‘8. All source audio’
trouble shooting guide.
13. Trouble shooting - No audio (RGB-PC)
Check SPDIF Cable
Check JK802
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 19)
Check Audio OSD
(Audio OSD active or inactive mode?)
Check R821 & R822, JK803
No(active)
Check Earphone output
(Pin 5, 16)
ok
No
Replace IC804 TPA6132A
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 BCM35230(IC101)
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)
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