LG 49UF77 Series Service Manual page 104

Standard Repair Process Detail Technical Manual
Error symptom
Content
<LD53V>
Checking order when there is no audio
1.Check the contact condition of or 24V connector of Main Board
2. Measure the 24V input voltage supplied from Power Board
(If there is no input voltage, remove and check the connector)
3.Connect the tester RX1 to 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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Only for training and service purposes
C. Audio error_No audio/Normal video
Voltage and speaker checking method
when there is no audio
②
Established
date
Revised
date
①
③
A21
1 SPK_R-
2 SPK_R+
3 SPK_L-
4 SPK_L+
LGE Internal Use Only
A21