LG 42LX6500-UB (CHASSIS:LA02R) Service Manual ▷ View online
Check RF Cable & Signal
Check Tuner 3.3V Power
L701
Replace L701
Check Tuner 1.2V Power
IC700 2 pin : 1.2V
Replace IC700.
ok
ok
No
No
Check Tuner 5V Power
L700
ok
Check IC8003
No
Replace IC8003
No
Replace L8007
ok
15. Trouble shooting - No audio (Analog TV audio)
Check TU_SIF path
Including Q701 TR buffer to LGE3549
ok
Check SIF Signal
TU700 9th Pin
ok
No
Bad Tuner. Replace Tuner.
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
No
Replace component
16. Trouble shooting - No audio (AV)
Check AV Cable for damage
or open conductor
Check Audio OSD
(Audio OSD active or inactive mode?)
ok
ok
No (Inactive)
Check R1058 & R900, JK300
Check Audio AMP Mute (pin25)
Replace JK100
No
ok
Check Audio Master clock // AUD_LRCH
AUD_LRCK, AUD_SCK(AMP pin17,18,19)
Replace BCM3549
Check JK100
No
ok
Check Audio AMP voltage
+1.8V_AMP, +3.3V_NORMAL,+24V_AMP
ok
ok
Check output L8804, L8805 &
AMP output
ok
Replace Audio AMP NTP7000
No
Follow procedure & refer to Audio signal block
Diagram
17. Trouble shooting - No audio (Component)
Check Component Cable
for damage or open conductor.
Check JK100 & Signal Line
ok
ok
No
Replace Jack
Follow procedure
‘8. All source audio’
trouble shooting guide.
Check Cable conductors
for damage or open conductor
Check JK8401 & Signal path
ok
No
ok
Replace Jack or components
Follow procedure
‘8. All source audio’
trouble shooting guide.
18. Trouble shooting - No audio (RGB-PC)
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