Adjustment Instruction - LG 42LW650G/S/T/W Service Manual

1. Application Range
This specification sheet is applied to all of the LED LCD TV
with LD12C 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. Automatic Adjustment
3.1. ADC Adjustment
(1) Overview
ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation.
* If Adjust ADC is "OTP", It doesn't need ADC adjustment.
(GP3-BCM)
(2) Equipment & Condition
1) Jig (RS-232C protocol)
2) MSPG-925 Series Pattern Generator(MSPG-925FA,
pattern - 65)
- Resolution : 480i Comp1
1080P Comp1
1920*1080 RGB
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
- Image
Copyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes

ADJUSTMENT INSTRUCTION

(3) Adjustment
1) Adjustment method
- Using RS-232, adjust items in the other shown in
"3.1.(3).3)"
2) Adj. protocol
Protocol Command
Enter adj. mode aa 00 00
Source change xb 00 40
xb 00 60
Begin adj. ad 00 10
Return adj. result
Read adj. data (main)
ad 00 20
(sub)
ad 00 21
Confirm adj. ad 00 99
End adj. aa 00 90
Ref.) ADC Adj. RS232C Protocol_Ver1.0
3) Adj. order
- aa 00 00 [Enter ADC adj. mode]
- xb 00 04 [Change input source to Component1(480i&1080p)]
- ad 00 10 [Adjust 480i Comp1]
- xb 00 06 [Change input source to RGB(1024*768)]
- ad 00 10 [Adjust 1024*768 RGB]
- ad 00 90 End adj.
3.2. MAC Address
(1) Equipment & Condition
- Play file: Serial.exe
- MAC Address edit
- Input Start / End MAC address
(2) Download method
1) Communication Prot connection
Connect: PCBA Jig-> RS-232C Port== PC-> RS-232C Port
- 10 -
Set ACK
a 00 OK00x
b 00 OK40x (Adjust 480i, 1080p Comp1 )
b 00 OK60x (Adjust 1920*1080 RGB)
OKx (Case of Success)
NGx (Case of Fail)
(main)
000000000000000000000000007c007b006dx
(Sub)
000000070000000000000000007c00830077x
NG 03 00x (Fail)
NG 03 01x (Fail)
NG 03 02x (Fail)
OK 03 03x (Success)
a 00 OK90x
PCBA
PC(RS-232C)
RS-232C Po rt
LGE Internal Use Only