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Adjustment Instruction - LG 47LH41 Service Manual

Chassis : la92g
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1. Application Range
This specification sheet is applied to all of the LCD TV with
LA92G chassis.
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 ±5ºC 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.
* 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 Component1 adjustment
•Adjust 1080p Component1 adjustment
•Adjust 1024*768 RGB adjustment
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
•EDID/DDC download
•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)
Copyright
2009
LG Electronics. Inc. All right reserved.
C
Only for training and service purposes

ADJUSTMENT INSTRUCTION

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)
2) Internal pattern is used. No external signal is needed.
4.1.3 Adjustment
4.1.3.1 Method
• Using RS-232, adjust items listed in 3.1 in the order shown
in "4.1.3.3".
4.1.3.2 Adjustment protocol
Protocol
Command
Source Input kb 00 04 b 00 OK04x (Adjust 480i/1080p Comp1 )
Change
kb 00 06 b 00 OK06x (Adjust 1024*768 RGB)
Begin adj.
ad 00 10
Return
adj. result
Read
(main)
adj. data
ad0020
(sub )
ad 00 21 000000070000000000000000007c00830077x
Confirm adj. ad 00 99 NG 03 00x (Fail)
End adj.
ad 00 90 d 00 OK90x
4.1.3.3 Adjustment order
• ad 00 00 [Enter ADC adjustment mode]
• kb 00 04 [Component1 Input Change]
• ad 00 10 [Adjust 480i Component1]
• ad 00 10 [Adjust 1080p Component1]
• kb 00 06 [RGB Input Change]
• ad 00 10 [Adjust 1024*768 RGB]
• ad 00 90 [End adjustment mode]
- 15 -
Set ack
OKx (Success)
NGx (Fail)
(main input )
0000000000000000000000007c007b006dx
(Sub input)
NG 03 01x Fail)
NG 03 02x (Fail )
OK 03 03x (Success)
LGE Internal Use Only

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