Read LG 72LEX9S-CA (CHASSIS:LC03N) Service Manual online
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ADJUSTMENT INSTRUCTION
1. Application Range
This specification sheet is applied to all of the LCD TV with
LC03N chassis.
2. Designation
(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 ºC ± 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 AC 100-240
V~ 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.
3.2 Final assembly adjustment
- White Balance adjustment
- RS-232C functionality check
- PING Test
- Factory Option setting per destination
- Ship-out mode setting (In-Stop)
- RS-232C functionality check
- PING Test
- Factory Option setting per destination
- Ship-out mode setting (In-Stop)
3. Adjustment items
3.1 Main PCB check process
- MAC address download
- Adjust ADC at 480i Comp1
- Adjust ADC at 1920*1080p Comp1, RGB
- EDID/DDC download
- Adjust ADC at 1920*1080p Comp1, RGB
- EDID/DDC download
3.3 Etc
- Ship-out mode
- Service Option Default
- USB download(S/W Update, Option, service only)
- Service Option Default
- USB download(S/W Update, Option, service only)
4. Automatic 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.
level and gain in Analog-to-Digital device and to
compensate RGB deviation.
Above adjustment items can be also performed in Final A-
ssembly if needed.
adjustment items can be checked with ‘1
.ADJUST CHECK’ in ‘
Both Board-level and Final assembly
IN-START’ menu.
4.1.2 Equipment & Condition
1) Jig (RS-232C protocol)
2) MSPG-925 Series pattern generat
1) Jig (RS-232C protocol)
2) MSPG-925 Series pattern generat
or (MSPG-925FS, pattern -65)
- Resolution : 480i Comp1 (MSPG-925FS,
Model-209, pattern -65)
1080P Comp1 (MSPG-925FS,
Model-255, pattern -65)
1920*1080 RGB (MSPG-925FS,
Model-255, pattern -65)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
- Image
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’.
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