LG 26LQ630H, Service Manual

Page: 6 / 41

- 6 - 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 LA1EX/Y 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.
(6) Adjustment equipments : Color Analyzer (CA-210 or
CA-110), SVC remote controller.
(7) Push The “IN STOP KEY” – For memory initialization.
[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). Component 1080p and 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) Ship-out mode
(2) Service Option Default
(3) USB Download (S/W Update, Option and Service only)
(4) ISP Download (Optional)
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.
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”
Case1 : Software version up
1) After downloading S/W by USB , TV set will reboot
automatically
2) Push “In-stop” key
3) Push “Power on” key
4) Function inspection
5) After function inspection, Push “In-stop” key.
Case2 : Function check at the assembly line
1) When TV set is entering on the assembly line, Push
“In-stop” key at first.
2) Push “Power on” key for turning it on.
=> If you push “Power on” key, TV set will recover channel
information by itself.
3).After function inspection, Push “In-stop” key.
* RS-232C Connection Method.
Connection : PCBA (USB Port) -> USB to Serial Adapter
(UC-232A) -> RS-232C cable -> PC(RS-232C port)
● Product name of USB to Serial Adapter is UC-232A.
=> Caution: LA1E* chassis support only UC-232A driver.
( only use this one.)