DOWNLOAD LG 42PC5D-AB (CHASSIS:PB73B) Service Manual ↓ Size: 10.26 MB | Pages: 42 in PDF or view online for FREE

Model
42PC5D-AB (CHASSIS:PB73B)
Pages
42
Size
10.26 MB
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PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
42pc5d-ab-chassis-pb73b.pdf
Date

LG 42PC5D-AB (CHASSIS:PB73B) Service Manual ▷ View online

- 5 -
ADJUSTMENT INSTRUCTIONS
1. Application Object
These instructions are applied to all of the 42” PLASMA TV,
PB73B Chassis
2. Notes
(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 equipment.
(2) Adjustments must be done in the correct order.
(3) The adjustments must be performed in the circumstance of
25±5°C  of  temperature  and  65±10%  of  relative  humidity  if
there is no specific designation.
(4)  The  input  voltage  of  the  receiver  be  must  kept  220V~,
60Hz when adjusting.
(5)  The  receiver  must  be  operational  for  about  15  minutes
prior to the adjustments.  
O
Preliminary action is 100% FULL WHITE PATTERN must
be operated automatically.(Ez-Adjust 10. Test Pattern)
O
Test for afterimage discharge detection
1) How to Adj R/C pressing Power key.
2) Press the ADJ KEY of the adjusting R/C to enter into the
Ez-Adjust, use the CH +/- key to select ‘10. WHITE
PATTERN’, and press the confirmation (
A
) key. Then,
‘100% FULL WHITE PATTERN’ is displayed.
[ Set is activated HEAT-RUN without signal generator in
this mode.
3EDID(The Extended Display 
Identification Data)/DDC
(Display Data Channel) Download
This has been established by VESA and is the function
created to “Plug and Play” by making the computer
reconfigure user environment through communication with the
monitor automatically without having the user set commands
directly to the PC or the monitor so that the user can use it
immediately.
* When writing EDID, use DDC2B protocol.
3-1. HDMI EDID Data Input
(1) Required Test Equipment
-  PC,  Jig  for  adjusting  DDC.  (PC  serial  to  D-sub
Connection equipment)
- S/W for writing DDC (EDID data write & read)
- D-Sub cable
- Jig for HDMI Cable connection
(2) Adjustment preparation & device configuration
- Configure as Fig. 7, and turn on the PC 
- Turn on the JIG.
- Run the DDC recording S/W (EDID Data Write & Read).
(Execute in DOS mode)
3-2. EDID DATA for PB75A
EDID for HDMI-1 (DDC (Display Data Channel) Data)
EDID table =
EDID for HDMI-2 (DDC (Display Data Channel) Data)
EDID table =
If you turn on a still screen more than 20 minutes (Especially
Digital pattern, Cross Hatch Pattern), an afterimage may occur
in the black level part of the screen.
PC
VSC
B/D
JIG cable(CPLD D/L )
<Fig.1>  Connection Diagram of CPLD Download
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48
- 6 -
EDID for HDMI-3 (DDC (Display Data Channel) Data)
EDID table =
EDID for RGB (DDC (Display Data Channel) Data)
EDID table =
4. POWER PCB Assy Voltage
Adjustments 
(Va, Vs Voltage adjustments)
4-1. Test Equipment :
D.M.M. 1EA
4-2.Connection Diagram for Measuring
: refer to Fig.2
4-3. Adjustment Method
(1) Va Adjustment
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M to Va pin of P812, connect
- terminal to GND pin of P812.
3)  After  turning  VR901,  voltage  of  D.M.M  adjustment  as
same  as  Va  voltage  which  on  label  of  panel  right/top.
(Deviation; ±0.5V)
(2) Vs Adjustment
1) Connect + terminal of D.M.M to Vs pin of P812, connect
– terminal to GND pin of P812.
2)  After  turning  VR951,  voltage  of  D.M.M  adjustment  as
same  as  Va  voltage  which  on  label  of  panel  right/top.
(Deviation; ±0.5V)
5. MST3361M-Set Adjustment
5-1. Synopsis
MST3361M-Set adjustment to set the black level and the Gain
of  optimum  with  an  automatic  movement  from  the  analog  =>
digital converter.
5-2. Test Equipment 
Service R/C, 801GF(802B,802F,802R), 
MSPG-925FA,MSPG-1025D Pattern Generator.
( 480i, 1080p Horizontal 60Hz Color Bar Pattern output will be
possible  and  the  output  level  will  accurately  have  to  be
revised with 0.7±0.1Vp-p)
*  It  should  be  checked  because  the  above  pattern  may  be
different  according  to  the  model  and  the  pattern  of  the  used
equipment.
5-3. Adjustment method
(1) Component1 adjustment method.
1) Select Component1 as the input with Color Bar Pattern
in 480i 60Hz mode and select ‘Component1’ on screen.
2)  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 ‘1. ADC 480i Comp1’. Pressing the Vol+
Key to adjust the component1.
3)  When  the  adjustment  is  over,  'ADC  Component1
Success’ is displayed.
4)  When  the  adjustment  is  not  normally  completed,  a
message  saying  ‘ADC  Component1  480i  Fail’  is
displayed.  When  the  component  is  not  connected,  a
message  saying  ‘Component1  Not  Connected’,  when
the  input  format  is  not  480i,  a  message  saying  ‘Not
Valid  Format’  and  when  the  input  signal  is  not  coming
out,  a  message  saying  ‘Check  Signal  Status’  is
displayed for 1 second.
(MSPG-925FA : -> model : 209, pattern : 65)
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<Fig.3> Adjust Pattern : 480i, 1080p 60Hz Color Bar Pattern
(Fig.2) Connection diagram of power adjustment for measuring
- 7 -
(2) Component1, RGB adjustment method.
1)  Select  Component1,  RGB  as  the  input  with  Color  Bar
Pattern  in  1080p  60Hz  mode  and  select  ‘Component1’
as input mode.
2)  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 ‘2. ADC 480i Comp1/RGB’. Pressing the
Vol+ Key to adjust the component1.
3)  When  the  adjustment  is  normally  completed,  the
message ‘ADC Component1 Success’ is displayed, or if
not,  the  message  ‘ADC  Component1  1080P  Fail’  is
displayed.  After  adjusting  the  Component1  is
completed, it is automatically switched to the RGB-DTV
mode,  and  the  RGB  adjustment  starts.  If  adjusting  is
normally  completed,  the  message  ‘ADC  RGB  1080P
Success’ is displayed.
4)  When  the  adjustment  is  not  normally  completed,  check
the pattern or the adjustment condition, and then adjust
it again. The error message is same to (4)) of (1)
5) After adjustment is complete, exit the adjustment mode
by pressing the ADJ KEY.
(MSPG-925FA : -> model : 225, pattern : 65)
6. Video Set Adjustment
It  is  the  adjustment  to  reduce  the  color  difference  of  the  RF
and the video signal, which adjusts Analog RF, AV-PAL, and
AV-NTSC.
6-1. Adjustment method
(1) Analog RF and AV-PAL adjustment method.
1) Connect the Video Signal Generator (Master) to the AV
input  of  the  TV  via  the  AV  output.  At  this  time,  when
entering  the  input  pattern  with  Model  :  202(PAL)  and
Pattern  :  33(100%  color  Bar),  the  following  screen  is
displayed.
*  It  should  be  checked  because  the  above  pattern  may  be
different  according  to  the  model  and  the  pattern  of  the  used
equipment.
2)  After  entering  the  in-house  signal,  when  it  is  checked
that  the  signal  is  received,  press  the  ADJ  KEY  of  the
adjusting  R/C  to  enter  into  ‘EZ-ADJUST’  Select  ‘3.
Adjust  RF  and  AV_PAL’  and  press  the  right  arrow  key
(
G
) to enter into the adjustment mode.
3) When it enters into the adjustment mode, the screen is
automatically  switched  to  TV  3CH  and  the  following
window is displayed.
4) When the automatic adjustment starts, the main screen
is adjusted, and if adjusting is completed, the message
‘RF-PAL  Configuration  Success’  is  displayed.  If
adjusting  is  failed,  the  message  ‘RF-PAL  Configuration
Fail’ is displayed.
5)  When  the  automatic  adjustment  of  the  RF  signal  is
completed,  it  is  automatically  switched  to  AV1  Mode
and  the  automatic  adjustment  is  performed  to  the  AV-
PAL. When the automatic adjustment is completed, the
message  ‘AV-PAL  Configuration  Success’  is  displayed.
If  the  adjustment  is  failed,  the  message  ‘AV-PAL
Configuration Fail’ is displayed.
(2) AV-NTSC adjustment method.
1) Connect the Video Signal Generator (Master) to the AV
input  of  the  TV  via  the  AV  output.  At  this  time,  when
entering  the  input  pattern  with  Model  :  201(NTSC)  and
Pattern  :  33(100%  color  Bar),  the  following  screen  is
displayed.
*  It  should  be  checked  because  the  above  pattern  may  be
different  according  to  the  model  and  the  pattern  of  the  used
equipment.
2)  Press  the  ADJ  KEY  of  the  adjusting  R/C  to  enter  into
‘EZ-ADJUST’ Select ‘4. Adjust AV_NTSC’ and press the
right arrow key (
G
) to enter into the adjustment mode.
3)  When  the  automatic  adjustment  is  completed,  the
message  ‘AV-NTSC  Configuration  Success’  is
displayed. If the adjustment is failed, the message ‘AV-
NTSC Configuration Fail’ is displayed.
<Fig.4> Model : 202(PAL), Pattern : 33(100% Color Bar)
<Fig.5> Model : 201(NTSC), Pattern : 33(100% Color Bar)
- 8 -
7. Adjustment of White Balance
7-1. Required Equipment
1) Color Analyzer : CA-100(CH 10)
2) When adjusting the PLASMA color temperature, the No.
10  channel  with  the  matrix  compensated  (White,  Red,
Green  and  Blue  compensated)  should  be  used  for  the
CS-1000  as  Color  analyzer  (CA-100),  which  should  be
adjusted  based  on  the  white  balance  adjustment
coordinate as described below.
2)  Automatic  adjuster  (necessary  for  the  automatic
adjustment, possible to communicate via the RS-232C)
3)  Video  Signal  Generator  MSPG-925F  720p,
216Gray(Model : 217, Pattern : 78)
7-2 Measuring device connection diagram
(for automatic adjustment)
7-3 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 7-3 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  PB75A  chassis
from the adjuster.
Caution)  For  automatic  adjustment,  RS-232C  Command  and
Chassis are commonly applied
Caution) Adjustment map
* White Balance adjustment (For automatic adjustment)
- Execute Power Only Key of the adjustment R/C to execute
automatic adjustment. Set the Baud Rate to 115200.
-  Always  start  adjustment  with  “wb  00  00”  and  end
adjustment with “wb 00 ff”
- Adjust the offset if necessary.
Color Analyer
RS-232C
Full White Pattern
  (Inner pattern)
<Fig. 6> Connection diagram for internal pattern
<Fig. 7> Connection diagram for HDMI input
216Gray White Pattern
       (HDMI Pattern)
Color Analyer
MSPG-925FS
MSPG-925FS
Video Signal Generator
ideo Signal Generator
Model : 217
Model : 217
Pattern : 78
Pattern : 78
RS-232C
RS-232C
Baud Rate : 1
Baud Rate : 115200
15200
Remark
RS-232C Command
[CMD  ID  DATA]
wb
wb
wb
wb
wb
wb
00
00
00
00
00
00
00
10
1f
20
2f
ff
Start white balance adjustment
End Gain adjustment
End Offset adjustment
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
192
192
192
64
64
64
Cool
192
192
192
64
64
64
Mid
192
192
192
64
64
64
Warm
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