Adjustment Instruction; Adjustment Items - LG 55G2 Service Manual

1. Application Range
This spec. sheet applies to L9(LG1152) Chassis applied LCD
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 °C 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) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15 °C
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. Final assembly adjustment
▪ EDID/DDC check
▪ White Balance adjustment
▪ ADC Adjustment check
▪ RS-232C functionality check
▪ Factory Option setting per destination
▪ Ship-out mode setting (In-Stop)
3.2. Etc
▪ Ship-out mode
▪ Tool option menu
▪ USB Download(S/W Update, Option, Service only)
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes

ADJUSTMENT INSTRUCTION

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3.3. Automatic Adjustment
3.3.1. Overview
ADC adjustment is needed to find the optimum black level and
gain in Analog-to-Digital device and to compensate RGB
deviation
3.3.2. Equipment & Condition
1) Jig (RS-232C protocol)
2) Inner Pattern
- Resolution : 1080p (Inner Pattern)
- Resolution : 1024*768 RGB (Inner Pattern)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
3.3.3 Adjustment
3.3.3.1. Adjustment method
▪ Using RS-232, adjust items listed in 3.1 in the other shown in
"4.1.3.3"
3.3.3.2. Adj. protocol
Protocol Command
Enter adj. mode aa 00 00
Source change xb 00 40
xb 00 60
Begin adj. ad 00 10
Return adj. result
Read adj. data (main)
ad 00 20
(sub )
ad 00 21
Confirm adj. ad 00 99
End adj. aa 00 90
3.3.3.3 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.
Ref) ADC adj. RS232C Protocol_Ver1.0
Set ACK
a 00 OK00x
b 00 OK40x (Adjust 480i Comp1 )
b 00 OK60x (Adjust 1024*768 RGB)
OKx (Case of Success)
NGx (Case of Fail)
(main)
000000000000000000000000007c007b006dx
(Sub)
000000070000000000000000007c00830077x
NG 03 00x (Fail)
NG 03 01x (Fail)
NG 03 02x (Fail)
OK 03 03x (Success)
a 00 OK90x
LGE Internal Use Only