Check The Contact Condition Of Or 13.2V Connector Of Main Board; Measure The 13.2V Input Voltage Supplied From Power Board (If There Is No Input Voltage, Remove And Check The Connector); Audio Error_No Audio/Normal Video; Pdim#1 ③ - LG 49LF620V Service Manual

Standard Repair Process Detail Technical Manual
Error symptom
Content
Checking order

1. Check the contact condition of or 13.2V connector of Main Board

2. Measure the 13.2V 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
12 Pin (Power Board ↔ Main Board)
②
SMH200-H12S4
1 Power on
3 GND
5 D.13.2V
7 A.13.2V
9 GND
11 DRV_ON
Established
date
Revised
date
2 PDIM#2
4 D.13.2V
6 D.13.2V
8 A.13.2V
10 GND
12 PDIM#1
A16
①
③
< Main Ass'y>
LGE Internal Use Only