LG 40LX770H Service Manual page 15

5.5. HDMI ARC Function Inspection
5.5.1. Test equipment
- Optic Receiver Speaker
- MSHG-600 (SW: 1220 ↑)
- HDMI Cable (for 1.4 version)
5.5.2. 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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Only for training and service purposes
6. Check Commercial features
Model
inch
IR Out
DC Power Out (12V)
Ext SPK Out
RJP (RJ-45 interface)
Pro:Idiom
b-LAN
6.1. External SPK Out
6.1.1. Equipment & Condition
▪ Jig (Speaker out JIG) or Oscilloscope
▪ Power only mode
6.1.2. Check the speaker out
(1) Connect the External Speaker : check the sound
Connect oscilloscope, you can see this waveform
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