LG 32LT670H, Service Manual

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LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to LA2E/F 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) At first Worker must turn on the SET by using Power Only
key.
(6) 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 Board Level Adjustment
(1) Adjust RGB (ADC)
(2) 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-Start Menu 1.
ADJUST CHECK.
RGB-PC Adjust will be calculated by 480i adjust value.
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) Shipment conditions
(2) Service Option Default
(3) USB Download (S/W Update, Option and Service only)
(4) ISP Download (Optional)
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) Protocol: RS-232C
(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
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
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.
Protocol Command Set ACK
Enter adj. mode aa 00 00 a 00 OK00x
Source change xb 00 40
xb 00 40
b 00 OK40x (Adjust 1080i Comp1 )
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 (main)
ad 00 20
(sub )
ad 00 21
(main)
000000000000000000000000007c007b006dx
(Sub)
000000070000000000000000007c00830077x
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