Adjustment Instruction - LG 22LV2500 Service Manual

1. Application range
This spec. sheet applies to LA01T 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 Adjustment must be done in the correct order.
2.3 The adjustment must be performed in the
circumstance of 25±5°C of temperature and 65±10%
of relative humidity
2.4 The input voltage of the receiver must keep
100~240V~, 50/60Hz.
2.5 At first Worker must turn on the SET by using Power
Only key.
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 a still image is displayed for 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
(1) Adjust 480i Comp1(ADC)
(2) EDID/DDC download
• Remark
- Above adjustment items can be also performed in Final
Assembly if needed. Adjustment items in both PCBA and
final assembly stages 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)
3.3 Etc
(1) Ship-out mode
(2) Service Option Default
(3) USB Download(S/W Update, Option, Service only)
(4) ISP Download (Optional)
Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes

ADJUSTMENT INSTRUCTION

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4. Board Level Adjustment
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) Jig (RS-232C protocol)
• Required equipment : Adjustment R/C
*Enter Service Mode by pushing "ADJ" key,
*Enter Internal ADC mode by pushing
Calibration"
4.1.3. Adjustment
4.1.3.1 Adjustment method
• Using RS-232, adjust items listed in 3.1 in the other
shown in "4.1.3.3"
4.1.3.2 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
Ref.) ADC Adj. RS232C Protocol_Ver1.0
4.1.3.3. Adj. order
• aa 00 00 [Enter ADC adj. mode]
• xb 00 40 [Change input source to Component1(1080i)]
• 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
"G" key at "6. ADC
Set ACK
a 00 OK00x
b 00 OK40x (Adjust 480i /1080p Comp1 )
b 00 OK60x (Adjust 1920*1080 RGB)
OKx (Case of Success)
NGx (Case of Fail)
(main)
000000000000000000000000007c007b006dx
(Sub)
000000070000000000000000007c00830077x
NG 03 00x (Fai l)
NG 03 01x (Fai l)
NG 03 02x (Fai l)
OK 03 03x (Success)
a 00 OK90x
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