LG OLED77G3 Series - Page 68

Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
when there is no audio
C. Audio error_No audio/Normal video
A21
Established
date
Revised
date
Error
symptom
Content
TV
A12
C. Audio error_ No audio / Normal video
Error symptom
Content A12
1
SPK_R
-_FT 2
SPK_R+_FT
3
SPK_L
-_FT 4
SPK_L+_FT
5
SPK_R
-_CT 6
SPK_R+_CT
7
SPK_L
-_CT 8
SPK_L+_CT
9
SPK_R
-_TW 10
SPK_R+_TW
11
SPK_L
-_TW 12
SPK_L+_TW
①
P202
SK100
P251
P201
②
P252
Voltage and speaker checking method
when there is no audio
Established
date
Revised
date
Checking order when there is no audio
1. Check the contact condition of or 20V connector of Main Board.
2. Measure the 13.2V output voltage from Power Board.
(If there is no input voltage, remove and check the connector.)
3. Connect the speaker terminal and if you hear the ‘Chik~ Chik~’ sound when you
touch the GND and output terminal, the speaker is normal.
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