DOWNLOAD LG 42PG6HD-UA (CHASSIS:PU83A) Service Manual ↓ Size: 10.77 MB | Pages: 27 in PDF or view online for FREE

Model
42PG6HD-UA (CHASSIS:PU83A)
Pages
27
Size
10.77 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
42pg6hd-ua-chassis-pu83a.pdf
Date

LG 42PG6HD-UA (CHASSIS:PU83A) Service Manual ▷ View online

- 5 -
3. PSU(Power Supply Unit) Voltage 
Adjustment 
(Va, Vs Voltage Adjustment)
Adjust the voltages Va and Vs supplied from the PSU to the
module within the specified range of each module to supply
the stable power
3-1. Test Equipment  
(1) D.M.M 1EA
(2) Voltage adjustment bar 
3-2. Adjustment(60”)
(1) Va Voltage Adjustment 
1) Connect + terminal of D.M.M to Va pin of P812 and
connect – terminal  to GND pin of P812.
2) Adjust VR901 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
(2) 
Vs Voltage Adjustment 
1) Connect + terminal of D.M.M to Vs pin of P812 and
connect – terminal  to GND pin of P812.
2) Adjust VR951 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
3-3. Adjustment (50”)
(1) Va Adjustment
1) Connect + terminal of D.M.M to Va pin of P12 and
connect – terminal  to GND pin of P12.
2) Adjust VR951 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
(2) Vs Adjustment
1) Connect + terminal of D.M.M to Vs pin of P12 and
connect – terminal to GND pin of P12.
2) Adjust VR901 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V) 
3-4. Adjustment(42”)
(1) Va Voltage Adjustment 
1) Connect + terminal of D.M.M to Va pin of P812 and
connect – terminal  to GND pin of P812.
2) Adjust VR901 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
(2) 
Vs Voltage Adjustment 
1) Connect + terminal of D.M.M to Vs pin of P812 and
connect – terminal  to GND pin of P812.
2) Adjust VR951 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
Each PCB assembly must be checked by check JIG set.
(Because power PCB Assembly damages to PDP Module,
especially be careful)
Connection Diagram of Power Adjustment for Measuring
(Power Board): 60”
Connection Diagram of Power Adjustment for Measuring
(Power Board): 50”
Connection Diagram of Power Adjustment for Measuring
(Power Board): 42”(EAY32808901)
- 6 -
4. Component 480i/1080p RGB 
1080p Adjustment
Component 480i/1080p RGB 1080p adjustment to set the
black level and the Gain to optimum.
4-1. Test Equipment 
(1) Service R/C
(2) 801GF(802B, 802F, 802R) or MSPG925FA Pattern
Generator (480i/1080p  The Horizontal 100% Color Bar
Pattern adjust to within  0.7±0.1Vp-p)
[
Because the above pattern can differ by the model and
pattern for each device, you must check the pattern first.
4-2. ADC 480i Component1 Adjustment
(1) Check the connection Component1 to the Test Equipment. 
(MSPG-925FA => Model: 209, Pattern: 65)
(2) Select Component1 as the input with  100% Horizontal
Color Bar Pattern(HozTV31Bar) in 480i Mode and select
‘Normal’ in screen.  
(3) After receiving signal for at least 1 second, press the ADJ
Key on the Service R/C to enter the ‘Ez - Adjust’ and select
the ‘3. ADC 480i Comp1’.
Pressing the Enter Key to adjust automatically.  
(4) When the adjustment is over, 'ADC Component1 Success’
is displayed. 
(5) If the adjustment has errors, 'ADC Component1 480i Fail’
is displayed. And error massage(‘Component1 Not
Connected’ or ‘Not Valid Format’ or ‘Check Signal Status’)
is displayed for 1 second.
4-3. ADC 1080p Component1/RGB 
Adjustment
(1) Check the connection Component1, RGB to the Test
Equipment (MSPG-925FA => Model: 225, Pattern: 65)
(2) Select Component1 as the input with  100% Horizontal
Color Bar Pattern(HozTV31Bar) in 1080p Mode and select
‘Normal’ in screen.
(3) After receiving signal for at least 1 second, press the ADJ
Key on the Service R/C to enter the ‘Ez - Adjust’ and select
the ‘4. ADC 1080p Comp1/RGB’.
Pressing the Enter Key to adjust automatically component1.
(4) When the adjustment is over, 'ADC Component1 Success’
is displayed. If the adjustment has errors, 'ADC
Component1 1080p Fail’ is displayed.
(5) After the Component1 adjustment is over, convert the
RGB-DTV Mode and start RGB adjustment. 
When the adjustment is over, 'ADC RGB 1080P Success’
is displayed.
(6) Readjust after confirming the case Pattern or adjustment
condition where the adjustment errors. 
Error massage is ‘Component1 Not Connected’ or ‘Not
Valid Format’ or ‘Check Signal Status’.
(7) After adjustment is complete, exit the adjustment mode by
pressing the ADJ KEY.
5EDID(The Extended Display 
Identification Data)/DDC
(Display Data Channel) Download
It is the feature to implement the “Plug and Play” which
automatically reconfigures the user’sl environment to directly
use by exchanging information without any command directly
to the PC or the monitor by the user, which is established by
the VESA
5-1. HDMI EDID Data Input
(1) Required Test Equipment
1) PC, Jig for adjusting DDC. (PC serial to D-sub
Connection equipment)
2) S/W for writing DDC(EDID data write & read)
3) D-Sub cable
4) Jig for HDMI Cable connection
(2) Preparation for Adjustments & 
Setting of Device
1) Set devices as below and turn on the PC and JIG.
2) Open S/W for writing DDC (EDID data write & read).
(operated in DOS mode)
<Fig. 1>  Adjustment Pattern: 480i/1080p 60Hz Pattern
LCD TV SET
(or Digital Board)
- 7 -
5-2. EDID DATA for PU83A
:
EDID for HDMI-1 (DDC (Display Data Channel) Data)
EDID table =
:
EDID for HDMI-2 (DDC (Display Data Channel) Data)
EDID table =
:
EDID for HDMI-3 (DDC (Display Data Channel) Data)
EDID table =
:
EDID DATA for RGB
EDID table =
- 8 -
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
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.
(2) Computer for adjusting (necessary for the automatic
adjustment, possible to communicate with the RS-232C,
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
(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.
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.
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. 
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)
(1) Connect the set according to the internal pattern or HDMI
input in accordance with measuring device connection
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
HDMI option)
(5) Select and adjust the model applicable to PU83A 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
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)
[Adjustment Map]
(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
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
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