50PN452D-ZE (CHASSIS:PD31B) - LG TV Service Manual (repair manual). Page 10

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4.6 LNB voltage and 22KHz tone check
 
(1) Test method
1)  Press "Power on" button of a service R/C.(Baud rate : 
115200 bps)
2) Connect cable between satellite ANT and test JIG.
3) Connect RS232-C Signal Cable.
4) Write LNB ON control command through RS-232-C.
5) check LED light ‘ON’ at 18V menu.
6) check LED light ‘ON’ at 22KHz tone menu.
7) Write LNB OFF control command through RS-232-C.
8) check LED light ‘OFF’ at 18V menu.
9) check LED light ‘OFF’ at 22KHz tone menu.
(2) RS-232 command for test LNB
(3) Test result
-  After send LNB On command, ‘18V LED’ and ‘22KHz 
tone LED’ should be ON. 
-  After send LNB Off command, ‘18V LED’ and ‘22KHz tone 
LED’ should be OFF. 
<Remark> 
After the measurement conditions witnessed in the last state.
* Caution :  Never connect HDMI & D-sub Cable when EDID 
downloaded.
■ Edid data and Model option download (RS232 Zender)
- Manual Download
* Caution
● Use the proper signal cable for EDID Download
   - Digital EDID : Pin3 exists
* Caution
- Never connect HDMI & D-sub Cable at the same time.
- Use the proper cables below for EDID Writing.
-  Download HDMI1, HDMI2 separately because HDMI1 is dif-
ferent from HDMI2.
NO
Enter  
download MODE
EDID data and
Model option download
Item
download ‘Mode In’
download
CMD 1
A
A
CMD 2
A
E
Data 0
0
00
0
10
When transfer the  
‘Mode In’,
Carry the command.
Automatically download
(The use of a internal 
Data)
No.
Item
Condition
Hex Data
1
Manufacturer ID
GSM
1E6D
2
Version
Digital : 1
01
3
Revision
Digital : 3
03
For HDMI EDID
DVI-D to HDMI or HDMI to HDMI
Command
Set ACK
LNB On
[A][I][ ][Set ID][ ][30][Cr]
[O][K][x] or NG : [N][G][x]
LNB Off
[A][I][ ][Set ID][ ][40][Cr]
[O][K][x] or NG : [N][G][x]
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tˆ•Gi–ˆ™‹
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4;Y
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55NK}#
Wrqh RQ
55NK}
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55NK}#
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