LG 37LC7D Series, Service Manual

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8. Adjustment of White Balance
8-1. The Purpose and Principal of Color
Temperature Adjustment
(1) Purpose: to reduce the difference in color temperature
among modules
(2) Principal: A module is in full dynamic range when RGB
Gain on OSD is 192. To adjust the white balance without
causing full dynamic range and full data, fix one of RGB
Gains at 192 and control the other two by reducing them
from 192.
8-2. Required Equipment
(1) Color Analyzer : CA-110 or CA-210
(2) Automatic adjustor (with automatic adjustment necessity
and the RS-232C communication being possible)
8-3. Connection Diagram of Equipment
for Measuring
(Automatic Adjustment)
Use the internal pattern to adjust White Balance. The pattern
is automatically given when the automatic adjustment device
is connected or when a user presses ADJ on the remote
controller to start Ez Adjust and then selects 6.White-Balance.
[
Requirements for Automatic Adjustment
(1) The illuminance of surroundings
10 lux or less; preventing light in surroundings as much as
possible
(2) The location of the Probe
1) For PDP: place the color analyzer (CA-110, CA-210)
close to the surface of a module and start the
adjustment.
2) For LCD: place the color analyzer (CA-110, CA-210)
close to the surface of a module within 10 cm and keep
the probe of the color analyzer at 80° to 100° angle from
the surface of a module.
(3) Aging time
1) Once Aging is started, keep the power on without power
supply interruption for at least 15 minutes for heat run.
2) For PDP, use the internal pattern to adjust White
Pattern.
3) For LCD, use NO SIGNAL or Full White Pattern to
ensure the backlight is turned on.
8-4. Adjustment of White Balance
(Automatic Adjustment)
(1) Turn on the POWER ON( ) of the remote controller to set
the adjustment and then start the automatic adjustment or
set the Baud Rate to 115200.Â) of the remote controller to
(2) Start the adjustment from “wb 00 00” and complete it at
“wb 00 ff”. (Adjust the offset if necessary)
wb 00 00 the automatic adjustment of White Balance is
started.
wb 00 10 adjusting gain (internal pattern appears) is
started.
ja 00 ff adjusting data
jb 00 c0
...
wb 00 1f adjusting gain is completed.
Adjust the offset (from wb 00 20 to wb 00 2f) if necessary.
wb 00 ff the automatic adjustment of White Balance
(internal pattern disappears) is completed.
C A -100+
C O L O R
A N A L Y Z E R
T Y P E ; C A -100+
F u l l W h i t e P at t er n
R S-232C
Connection Diagram of Automatic Adjustment