42LS3400, 42LS349C (CHASSIS:LA25C, LA21B) - LG TV Service Manual (repair manual). Page 7

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4.1. ADC Calibration 
4.1.1. Overview
▪  ADC  adjustment  is  needed  to  find  the  optimum  black  level 
and gain in Analog-to-Digital device and to compensate RGB 
deviation
4.1.2. Equipment & Condition
(1) Protocol: RS-232C
(2) Inner Pattern
   - Resolution : 1080p(Comp)
   - Pattern : Horizontal 100% Color Bar Pattern
   - Pattern level : 0.7±0.1 Vp-p
4.1.3. Adjustment
4.1.3.1. Adjustment method
- Connect to Jig by using RS-232, adjust Component
4.1.3.2. Adj. protocol
Protocol
CMD 1
CMD 2
Data 1
Data 2
Remark 
Enter 
adj 
mode
a
a
00
00
When 
transfer 
the  ‘Mode 
In’,Carry 
the com-
mand.
Start 
ADC adj
a
d
00
10
Automati-
cally adjust-
ment (Use 
internal 
pattern)
4.1.3.3. Manual ADC process using Service Remocon
After enter Service Mode by pushing “ADJ” key, execute “ADC 
Adjust” by pushing “►” key at “ 0. ADC CALIBRATION ”.
0. TOOL OPTION1
1. TOOL OPTION2
2. TOOL OPTION3
3. Country Group                       
4. ADC CALIBRATION
5. W/B ADJUST
6. EDID D/L (PCM)
7. SUB B/C ADJUST
※
  Manual ADC  Confirmation  using  Service  Remocon. After 
enter Service Mode by pushing “INSTART” key,
ADJUST ADC (COMPONENT) : OK
4.2. EDID Download
4.2.1. Overview
▪  It  is  a  VESA  regulation. A  PC  or  a  MNT  will  display  an 
optimal  resolution  through  information  sharing  without  any 
necessity  of user input. It is a realization of “Plug and Play”.  
4.2.2. Equipment
(1)  Since EDID data is embedded, EDID download JIG, HDMI 
cable and D-sub cable are not need.
(2) Adjust by using remote controller.
4.2.3. Download method (using DFT)
PC(for  communication  through  RS-232C),  UART  baud  rate: 
115200 bps
Command : aa 00 00 (Start Factory mode)
Command : ae 00 10 (Download All EDID)
Command : aa 00 90 (End of Factory mode)
4.2.4. Download method (using Service Remocon)
(1) Press Adj. key on the Adj. R/C,
(2) Select EDID D/L menu.
(3) By pressing Enter key, EDID download will begin
(4)  If Download is successful, OK is display, but If Download is 
failure, NG is displayed.
(5) If Download is failure, Re-try downloads.
※
Caution:  When  EDID  Download,  must  remove  RGB/HDMI 
Cable.
(6) EDID Write confirmation
EDID D/L (PCM)
HDMI1 : OK
HDMI2 : OK

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