72LM9500-DA (CHASSIS:LT23J) - LG TV Service Manual (repair manual). Page 18

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5.13. HDMI ARC Function Inspection 
5.13.1. Test equipment
- Optic Receiver Speaker          
- MSHG-600 (SW: 1220 ↑) 
- HDMI Cable (for 1.4 version)
5.13.2. Test method
(1)  Insert  the  HDMI  Cable  to  the  HDMI ARC  port  from  the 
master equipment (HDMI1)
(2) Check the sound from the TV Set
(3)  Check  the  Sound  from  the  Speaker  or  using AV  &  Optic 
TEST program (It’s connected to MSHG-600)
* Remark:  Inspect in Power Only Mode and check SW version 
in a master equipment
.
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