42LS341C, 42LS3450, 42LS345Y (CHASSIS:LB21C) - LG TV Service Manual (repair manual). Page 14

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* Manual Download(Model Name and Serial Number)
If the TV set is downloaded by OTA or Service man, sometimes 
model name or serial number is initialized.(Not always)
There is impossible to download by bar code scan, so It need 
Manual download.
1) Press the "Instart" key of Adjustment remote control.
2) Go to the menu "6.Model Number D/L" like below photo.
3) Input the Factory model name or Serial number like photo.
4) Check the model name Instart menu. → Factory name displayed.
5)  Check  the  Product/Service  info..(Menu  key  →  Red  key  → 
Select product/Service info) → Buyer model displayed.
4.3.4. Outgoing condition Configuration
■  When  pressing  IN-STOP  key  by  Service  remote  control, 
Red  LED  are  blinked  alternatively. And  then  automatically 
turn off. (Must not AC power OFF during blinking)
4.4 Hi-Pot Test
Confirm  whether  is  normal  or  not  when  between  power 
board's  ac  block  and  GND  is  impacted  on  1.5  kV(dc)  or  2.2 
kV(dc) for one second.
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