42LA6150 (CHASSIS:LA33B) - LG TV Service Manual (repair manual). Page 10

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ADJUSTMENT INSTRUCTION
1. Application
This spec. sheet applies to LA31/B/F 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: Component 480i, 1080p / RGB-PC 1080p
(2) EDID download: HDMI and RGB-PC
 Remark
-  Above  adjustment  items  can  be  also  performed  in  Final 
Assembly  if  needed. Adjustment  items  in  both  PCBA  and 
final assembly tages can be checked by using the INSTART 
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 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) / 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 Component
 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]
 In L13 case, Adjust ADC(OTP) is automatically ‘OK’ 
 
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)
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