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Checking order when there is no audio

1. Check the contact condition of or 20V connector of Main Board.

2. Measure the 20V input voltage supplied from Power Board.

(If there is no input voltage, remove and check the connector.)

3. Connect the tester P5400 to the speaker terminal and if you hear the ‘Chik~ Chik~’

sound when you touch the GND and output terminal, the speaker is normal.

Voltage and speaker checking method

when there is no audio

C. Audio error_No audio/Normal video

A12

Error

symptom

Content

A12

Standard Repair Process Detail Technical Manual

Established

date

Revised

date

P201

P251

P202

②

①

Only for training and service purposes.

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LG OLED77C3 Series Specifications

General

Screen Size	77 inches
Display Technology	OLED
HDR	Dolby Vision, HDR10, HLG
Smart TV Platform	webOS
HDMI Ports	4
Audio Output	40W
Voice Assistant	Google Assistant, Amazon Alexa
Refresh Rate	120 Hz
Processor	α9 Gen6 AI Processor 4K
VRR	Yes
USB Ports	3
Resolution	3840 x 2160
Bluetooth	Yes
Wi-Fi	Yes