Adjustment Instruction; Designation; Automatic Adjustment - LG 79UB980T-TA Service Manual

1. Application Range
This specification sheet is applied to all of the LED TV with
LB41U 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 °C ± 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 AC 100-240
V~, 50/60 Hz.
(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. Automatic Adjustment

3.1. ADC Adjustment
ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate RGB
deviation.
3.1.1. Equipment & Condition
(1) USB to RS-232C Jig
(2) MSPG-925 Series Pattern Generator(MSPG-925FA,
pattern - 65)
- Resolution : 480i Comp1
1080P Comp1
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7 ± 0.1 Vp-p
- Image
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes

ADJUSTMENT INSTRUCTION

- 14 -
3.1.2. Adjustment method
- Using RS-232, adjust items in the other shown in "3.1.3"
3.1.3. Adj. protocol
Protocol Command
Enter adj. mode aa 00 00 a 00 OK00x
xb 00 04 b 00 OK04x (Adjust 480i, 1080p Comp1 )
Source change
xb 00 06 b 00 OK06x (Adjust 1920*1080 RGB)
Begin adj. ad 00 10
Return adj. OKx (Case of Success)
result NGx (Case of Fail)
(main) (main)
ad 00 20 000000000000000000000000007c007b006dx
Read adj. data
(sub ) (Sub)
ad 00 21 000000070000000000000000007c00830077x
NG 03 00x (Fail)
NG 03 01x (Fail)
Confirm adj. ad 00 99
NG 03 02x (Fail)
OK 03 03x (Success)
End adj. aa 00 90 a 00 OK90x
Ref.) ADC Adj. RS232C Protocol_Ver1.0
3.1.4. Adj. order
- aa 00 00 [Enter ADC adj. mode]
- xb 00 04 [Change input source to Component1(480i& 1080p)]
- ad 00 10 [Adjust 480i&1080p Comp1]
- xb 00 06 [Change input source to RGB(1024*768)]
- ad 00 10 [Adjust 1920*1080 RGB]
- ad 00 90 End adj.
3.2. MAC address, ESN, Widevine, HDCP
2.0 key download
(1) Equipment & Condition
1) Play file: keydownload.exe
(2) Communication Port connection
1) Key Write: Com 1,2,3,4 and 115200 (Baudrate)
2) Barcode: Com 1,2,3,4 and 9600 (Baudrate)
(3) Download process
1) Select the download items.
2) Mode check: Online Only
3) Check the test process: DETECT → MAC_WRITE →
WIDEVINE_WRITE
4) Play: START
5) Check of result: Ready, Test, OK or NG
(4) Communication Port connection
1) Connect
: PCBA Jig → RS-232C Port == PC → RS-232C Port
Set ACK
LGE Internal Use Only