LG Electronics 3450, 340S, 340T service manual C. Audio error, Lcd Tv, Check audio B+ Voltage

Standard Repair Process

	Error	C. Audio error	Established	2012. 01 .14
LCD TV			date
	symptom	Wrecked audio/ discontinuation/noise	Revised date		10/14

→abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio

☞A16

Check input signal -RF

-External Input signal

Signal normal?

N

Y

(When RF signal is not received)

Wrecked audio/	Check and replace
Discontinuation/
	speaker and
Noise for
	connector
all audio

Wrecked audio/ Discontinuation/

Noise only Replace Main B/D for D-TV

Wrecked audio/ Discontinuation/ Noise only

for Analog

Check audio

B+ Voltage (24V)

Y

Normal

voltage?

N

Replace Power B/D

Request repair to external cable/ANT provider

(In case of External Input signal error) Check and fix external device

Wrecked audio/ Discontinuation/ Noise only

for External Input

Connect and check other external device

Normal audio?

Y

Replace Main B/D

N

End

Check and fix external device

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