32LN549E (CHASSIS:LA3AA) — LG TV Service Manual (repair manual). Page 8

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ADJUSTMENT INSTRUCTION
1. Application
This spec. sheet applies to LA3AA Chassis applied LED TV all 
models manufactured in TV factory
2. Specification
(1)  Because this is not a hot chassis, it is not necessary to use 
an  isolation  transformer.  However,  the  use  of  isolation 
transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3)  The adjustment must be performed in the circumstance of 
25 ±5 ºC of temperature and 65±10% of relative humidity if 
there is no specific designation
(4)  The  input  voltage  of  the  receiver  must  keep  100~240V, 
50/60Hz
(5)  At first Worker must turn on the SET by using Power Only 
key.
(6)  The receiver must be operated for about 5 minutes prior to 
the adjustment when module is in the circumstance of over 
15 ºC
     In case of keeping module is in the circumstance of 0°C, it 
should be placed in the circumstance of above 15°C for 2 
hours
     In case of keeping module is in the circumstance of below 
-20°C,  it  should  be  placed  in  the  circumstance  of  above 
15°C for 3 hours.
 Caution
When  still  image  is  displayed  for  a  period  of  20  minutes  or 
longer (especially where W/B scale is strong.
Digital  pattern  13ch  and/or  Cross  hatch  pattern  09ch),  there 
can some afterimage in the black level area
 
3. Adjustment items
3.1. Main PCBA Adjustments
(1) ADC adjustment : ADC adjustment is OTP (Auto ADC)
(2) EDID download : HDMI
■  Above  adjustment  items  can  be  also  performed  in  Final 
Assembly if needed. 
   Both Board-level and Final assembly adjustment items can 
be check using In-Start Menu (1.Adjust Check). 
3.2. Final assembly adjustment
(1) White Balance adjustment
(2) RS-232C functionality check
(3) Factory Option setting per destination
(4) Shipment mode setting (In-Stop)
(5) GND and HI-POT test
3.3. Appendix
(1) Shipment conditions
(2) Tool option menu
(3) USB Download (S/W Update, Option and Service only)
(4) Preset CH Information
4. MAIN PCBA Adjustments
4.1. ADC Adjustment
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 : 1024*768(RGB)
- 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(USB), adjust RGB
 Manual adj (If needed in Final Assembly)
- Required equipment : Adjustment R/C
- Enter Service Mode by pushing “ADJ” key,
-  Start  ‘OTP’  ADC  Type  by  pushing  ‘►’  key  at  [7.  ADC 
Calibration]
Protocol
CMD 1 CMD 2 Data 1 Data 2
Remark
Enter adj 
mode
a
a
00
00
When transfer the  ‘Mode 
In’,Carry the command
Start ADC 
adj
a
d
00
10
Automatically adjustment 
(Use internal pattern)
4.1.3.3. ADC RGB
1)  Press  the  In-start  Key  on  the ADJ  remote  after  at  least  1 
min of signal reception. Then, select ADC Calibration. And 
Press OK Button on the menu “Start”. The adjustment will 
start automatically.
2)  If  ADC  RGB  is  successful,  “ADC  RGB  Success”  is 
displayed and ADC RGB is completed. If ADC calibration is 
failure, “ADC RGB Fail” is displayed.
3)  If ADC calibration is failure, after rechecking ADC pattern or 
condition, retry calibration
 
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