LG 50PG70F-UB (CHASSIS:PU82C) Service Manual ▷ View online
- 9 -
ADJUSTMENT INSTRUCTIONS
6. Adjustment of White Balance
6-1. Required Test Equipment
(1) Color Analyzer : CA-210 (CH 10), CA-100(CH-10), CA-
100+(CH-10)
=> To adjust color temperature of Plasma, CS-1000 is the
=> To adjust color temperature of Plasma, CS-1000 is the
Color Analyzer and should be set to use CH 10 in which
white, red, green, and blue color are corrected. Conduct
the adjustment according to the coordinates for White
Balance adjustment in the table below.
white, red, green, and blue color are corrected. Conduct
the adjustment according to the coordinates for White
Balance adjustment in the table below.
(2) Computer for adjusting (necessary for the automatic
adjustment, possible to communicate with the RS-232C,
Baud Rate : 115200)
Baud Rate : 115200)
(3) Video Signal Generator MSPG-925F 720p, 216Gray
(Model :217, Pattern 78)
[
Requirements for Automatic Adjustment
(1) The illuminance of surroundings
10 lux or less; preventing light in surroundings as much as
possible
possible
(2) The location of the Probe
1) For PDP: place the color analyzer (CA-100, CA-100+)
close to the surface of a module and start the
adjustment.
adjustment.
2) For LCD: place the color analyzer (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.
the color analyzer at 80° to 100° angle from the surface
of a module.
6-2. Connection Diagram of Equipment
for Measuring
(Automatic Adjustment)
6-3. White Balance Adjustment Method
Basically it uses the internal pattern but when internal pattern
is not possible, you can select HDMI input for adjustment.
Through the option at the most bottom part of the Ez Adjust
Menu 7.White Balance menu, you can select NONE, INNER
and HDMI, and the default is set to INNER. When the
adjustment cannot be done with the internal pattern, you can
select HDMI input for adjustment.
is not possible, you can select HDMI input for adjustment.
Through the option at the most bottom part of the Ez Adjust
Menu 7.White Balance menu, you can select NONE, INNER
and HDMI, and the default is set to INNER. When the
adjustment cannot be done with the internal pattern, you can
select HDMI input for adjustment.
For manual adjustment, press the ADJ KEY of the adjustment
R/C to enter Ez Adjust 7.White-Balance, and the pattern is
automatically displayed. (When you set the Option to INNER,
the default is always set to INNER)
R/C to enter Ez Adjust 7.White-Balance, and the pattern is
automatically displayed. (When you set the Option to INNER,
the default is always set to INNER)
(1) Connect the set according to the internal pattern or HDMI
input in accordance with measuring device connection
diagram.
diagram.
(2) Set the Baud Rate of RS-232C to 115200. It is set to
115200 as default.
(3) Connect the RS-232C Cable to the set.
(4) Connect the HDMI Cable to the set. (Limited to the set with
(4) Connect the HDMI Cable to the set. (Limited to the set with
HDMI option)
(5) Select and adjust the model applicable to PU82C chassis
from the adjuster.
[RS-232C command used for the automatic adjustment]
Ô
Wb 00 00-----white balance Automatic Adjustment Start
Ô
Ô
Ja 00 ff------Adjustment Data
(internal pattern)
Connection Diagram for HDMI Input
wb
wb
wb
wb
wb
wb
00
00
00
00
00
00
00
10
1f
20
2f
ff
White Balance Adjustment Start
Gain Adjustment End
Offset Adjustment End
White Balance Adjustment End
RS-232C COMMAND
[CMD ID DATA]
Meaning
- 10 -
ADJUSTMENT INSTRUCTIONS
Ô
Jb 00 c0
Ô
...
Ô
Wb 00 1f-----Gain Adjustment End
Ô
*(wb 00 20(Start), wb 00 2f(End))----- When adjust Off-set
Ô
Wb 00 ff------White Balance Automatic Adjustment End
(Disappear Inside pattern)
(Disappear Inside pattern)
[Adjustment Map]
6-4. Automatic Adjustment
(1) Execute POWER ON(
Â
) of the adjustment R/C to execute
automatic adjustment.
(2) Set the Baud Rate to 115200.
(3) Always start adjustment with “wb 00 00” and end
(3) Always start adjustment with “wb 00 00” and end
adjustment with “wb 00 ff”
(4) Adjust the offset if necessary
6-5. Manual Adjustment
(1) Required Test Equipment: CA-210 (CH 10), CA-100(CH-
10), CA-100+(CH-10)
=> To adjust color temperature of Plasma, CS-1000 is the
=> To adjust color temperature of Plasma, CS-1000 is the
Color Analyzer and should be set to use CH 10 in which
white, red, green, and blue color are corrected. Conduct
the adjustment according to the coordinates for White
Balance adjustment in the table below.
white, red, green, and blue color are corrected. Conduct
the adjustment according to the coordinates for White
Balance adjustment in the table below.
(2) Enter the ‘Ez - Adjust’ by pressing the ADJ on the Service
R/C.
(3) Select 10.TEST PATTERN using the CH + / - KEY and
press the Enter KEY to execute a heat run for more than
30 minutes.
30 minutes.
(4) Execute a Zero Calibration for CA-210 and put it at
distance of less than 10Cm from the PDP module surface
center during the adjustment.
center during the adjustment.
(5) Select ‘7. White-Balance’ of ‘Ez - Adjust’ by pressing the
ADJ KEY on the Service R/C. Then enter adjustment mode
by pressing the Right KEY (
by pressing the Right KEY (
G
) .
(The internal pattern of full white appears by pressing
G
)
(6) The adjustment is conducted in three levels of color
temperature; COOL, MEDIUM, and WARM.
-When R Gain is Fixed at Default value(192)
Adjust G gain and B gain with decreasing Default values
from 192
from 192
-When B Gain is Fixed at Default value(192)
Adjust R gain and G gain with decreasing Default values
from 192
from 192
-When G Gain is Fixed at Default value(192)
Adjust R gain and B gain with decreasing Default values
from 192
from 192
One of R/G.B Gain should be fixed at 192 and adjust two
Gain Value with decreasing the Default values from 192.
Gain Value with decreasing the Default values from 192.
(7) Use the Vol. +, - key for adjustment.
(8) When the adjustment is completed, press the ENTER (
(8) When the adjustment is completed, press the ENTER (
Á
KEY) button to move to the Ez –Adjust screen. Press the
ADJ KEY to exit the adjustment mode.
ADJ KEY to exit the adjustment mode.
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
Jg
Jh
Ji
Cool
Ja
Jb
Jc
Mid
RS-232C COMMAND
[CMD ID DATA]
CENTER
(DEFAULT)
Jd
Je
Jf
00
00
00
192
192
192
127
127
127
Warm
Min
Max
184
187
192
64
64
64
Cool
192
183
161
64
64
64
Mid
192
159
95
64
64
64
Warm
- 11 -
TROUBLE SHOOTING GUIDE
TV/CATV(Analog ) doesn t display
Check TU1 Pin16(Video output)
Can you see the normal signal?
Check the input(Pin1) of Low-Pass Filter
(IC808).
Can you see the normal waveform?
Check the output(pin8) of Low-Pass
Filter(IC808).
Can you see the normal waveform?
Check the Capaciter(C658) in front of
BCM3553 chip.
Can you see the normal waveform?
YES
YES
YES
NO
Could you measure VCC voltage(3Pin) of TU1 & IIC
lines(7,8Pin)?
Are they all normal?
YES
You should replace TUNER.
NO
After checking the C800(0.1uF Cap), you can
suspect that PCB is bad.
NO
After checking the Power of Low-Pass Filter you
should decide to replace Low-Pass Filter or not.
NO
After checking the pattern between pin8 of IC808
and C658, you can suspect that PCB is bad..
YES
This board has big problem because Main
chip(BCM3550) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM3553 or not.
- 12 -
TROUBLE SHOOTING GUIDE
Video doesn t display
Check JP7004.
Can you see the normal waveform?
Check the Registor(R732).
Can you see the normal waveform?
YES
YES
NO
JK701 may have problem. Replace this
Jack.
Check the C651 in front of BCM3553 chip.
Can you see the normal waveform?
NO
replace Part(R732).
YES
This board has big problem because Main
chip(BCM3553) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM3553 or not.
NO
After check the pattern between R703 and C651,
You can suspect that PCB is bad.
Click on the first or last page to see other 50PG70F-UB (CHASSIS:PU82C) service manuals if exist.