47LD450 (CHASSIS:LA01B) - LG TV Service Manual (repair manual). Page 10

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- 10 -
1. Application range 
This spec. sheet applies to LA01B Chassis applied LCD TV all
models manufactured in TV factory 
2. Specification
2.1   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.  
2.2   AdjThe adjustment must be performed in the
circumstance of 25 ±5 C of temperature and
65±10% of relative humidity if there is no specific
2.4   The input voltage of the receiver must keep
100~240V, 50/60Hz.  
2.5   The receiver must be operated for about 5 minutes
prior to the adjustment when module is in the
circumstance of over 15 
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 Board Level Adjustment  
•Adjust 480i Comp1(ADC) 
•EDID/DDC download 
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-Star Menu 1.ADJUST
CHECK. Component 1080p and RGB-PC Adjust will be
calculated by 480i adjust value. 
3.2 Final assembly adjustment 
•White Balance adjustment 
•RS-232C functionality check 
•Factory Option setting per destination 
•Ship-out mode setting (In-Stop) 
3.3 Etc
•Ship-out mode 
•Service Option Default 
•USB Download(S/W Update, Option, Service only) 
•ISP Download (Optional) 
4. Automatic Adjustment
4.1. ADC Adjustment
(1) Overview
ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation. 
(2) Equipment & Condition
1) Jig (RS-232C protocol)
2) MSPG-925 Series Pattern Generator(MSPG-925FA) 
- Resolution : 480i Comp1 (MSPG-925FA: model-209,
- Resolution : 1024*768 RGB (Inner Pattern) 
- Pattern : Horizontal 100% Color Bar Pattern 
- Pattern level : 0.7±0.1 Vp-p
(3) Adjustment
1) Adjustment method
- Using RS-232, adjust items listed in 3.1 in the other
shown in “”
2) Adj. protocol
Ref.) ADC Adj. RS232C Protocol_Ver1.0
3) Adj. order
- aa 00 00  [Enter ADC adj. mode]
- xb 00 40  [Change input source to Component1(480i)]
- ad 00 10  [Adjust 480i Comp1]
- xb 00 60  [Change input source to RGB(1024*768)]
- ad 00 10  [Adjust 1024*768 RGB]
- ad 00 90  End adj.
Enter adj. mode
aa 00 00
a 00 OK00x
Source change
xb 00 40
b 00 OK40x (Adjust 480i Comp1 )
xb 00 60 
b 00 OK60x (Adjust 1024*768 RGB)
Begin adj.
ad 00 10
Return adj. result
OKx (Case of Success)
NGx (Case of Fail)
Read adj. data
ad 00 20 
ad 00 21
Confirm adj.
ad 00 99
NG 03 00x (Fail)
NG 03 01x (Fail)
NG 03 02x (Fail)
OK 03 03x (Success)
End adj.
aa 00 90
a 00 OK90x
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