LG 50UH5500 Service Manual page 92

Standard Repair Process
Error
symptom
→ abnormal audio/discontinuation/noise is same after "Check input signal" compared to No audio
Check input si
gnal
Signal
-RF
normal?
-External Input
signal
N
C. Audio error
Wrecked audio/ discontinuation/noise
Y
(When RF signal is not re
ceived)
Request repair to external
cable/ANT provider
(In case of Extern
al Input signal err
or)
Check and fix ext
ernal device
Established
date
Revised date
Wrecked audio/
Check and replace
Discontinuation/
speaker and conne
Noise for
ctor
all audio
Wrecked audio/
Discontinuation/
Replace Main B/D
Noise only
for D-TV
Wrecked audio/
Discontinuation/
Noise only
for Analog
Wrecked audio/
Discontinuation/
Noise only
for External Input
Connect and check
other external devic
e
Check and fix external device
9
9/16
☞A21+A18
Check audio
B+ Voltage (A13V)
Y
Normal
voltage?
N
Replace Power B/D
End
Replace Main B/D
N
Normal
audio?
Y