DOWNLOAD LG 32LN49XX / 32LN4900 (CHASSIS:LB35B) Service Manual ↓ Size: 6 MB | Pages: 58 in PDF or view online for FREE

Model
32LN49XX 32LN4900 (CHASSIS:LB35B)
Pages
58
Size
6 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
32ln49xx-32ln4900-chassis-lb35b.pdf
Date

LG 32LN49XX / 32LN4900 (CHASSIS:LB35B) Service Manual ▷ View online

- 10 -
4. White Balance Adjustment
4.1. Overview
4.1.1. W/B adj. Objective & How-it-works
(1) Objective: To reduce each Panel’s W/B deviation
(2)  How-it-works:  When  R/G/B  gain  in  the  OSD  is  at  192,  it 
means the panel is at its Full Dynamic Range. In order to 
prevent saturation of Full Dynamic range and data, one of 
R/G/B is fixed at 192, and the other two is lowered to find 
the desired value. 
(3) Adj. condition: normal temperature
1) Surrounding Temperature: 25 °C ± 5 °C
2) Warm-up time: About 5 Min◦
3) Surrounding Humidity: 20% ~ 80%
4)  Before  White  balance  adjustment,  Keep  power  on 
status, don’t power off
4.1.2. Adj. condition and cautionary items
(1)  Lighting condition in surrounding area surrounding lighting 
should be lower 10 lux. 
     Try to isolate adj. area into dark surrounding.
(2)  Probe  location:  Color Analyzer(CA-210)  probe  should  be 
within 10 cm and perpendicular of the module surface
     (80°~ 100°)
(3) Aging time
1)  After Aging  Start,  Keep  the  Power  ON  status  during  5 
Minutes.
2)  In case of LCD, Back-light on should be checked using 
no signal or Full-white pattern.
4.2. Equipment
(1)  Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED: 
CH14)
(2)  Adj.  Computer  (During  auto  adj.,  RS-232C  protocol  is 
needed)
(3) Adjust Remocon
(4) Video Signal Generator MSPG-925F 720p/204-Gray
     (Model: 217, Pattern: 49) 
* Color Analyzer Matrix should be calibrated using CS-1000.
4.3. Equipment connection
4.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
(2) Adjustment Map
4.5. Adjustment method
4.5.1. Auto WB calibration
(1)  Set TV in ADJ mode using P-Only key(or POWER ON key).
(2)  Place optical probe on the center of the display.
     -  It need to check probe condition of zero calibration before 
adjustment.
(3) Connect RS-232C Cable
(4) Select mode in ADJ Program and begin a adjustment.
(5)  When  WB  adjustment  is  completed  with  OK  message, 
check adjustment status of pre-set mode. (Cool, Medium, 
Warm)
(6) Remove probe and RS-232C cable.
▪  W/B Adj. must begin as start command “wb 00 00” , and 
finish as end command “wb 00 ff”, and Adj. offset if need.
4.5.2. LED White balance table
- G-gain should be fixed. 
(1) Cool Mode
1)  Purpose  : Adjust  the  color  temperature  to  reduce  the 
deviation of the module color temperature.
2)  Principle  :  To  adjust  the  white  balance  without  the 
saturation,  Fix  the  G  gain  to  172  (default  data)  and 
change the others (R/B Gain ).
3) Adjustment mode : mode - Cool
(2) Medium / Warm Mode
1)  Purpose  : Adjust  the  color  temperature  to  reduce  the 
deviation of the module color temperature.
2)  Principle  :  To  adjust  the  white  balance  without  the 
saturation,  Fix  the  one  of  R/G/B  gain  to  192  (default 
data) and decrease the others.
3) Adjustment mode : Two modes - Medium / Warm
Color Analyzer
 
Computer 
Pattern Generator
 
RS-232C 
RS-232C 
RS-232C 
Probe
Signal Source
* If TV internal pattern is used, not needed
RS-232C COMMAND
Explantion
CMD
DATA
ID
wb
00
00
Begin White Balance adjustment
wb
00
ff
End White Balance adjustment
(internal pattern disappears )
Adj. item
Command
(lower caseASCII)
Data Range
(Hex.)
Default
(Decimal)
CMD1
CMD2
MIN
MAX
Cool
R Gain
j
g
00
C0
G Gain
j
h
00
C0
B Gain
j
i
00
C0
R Cut
G Cut
B Cut
Medium
R Gain
j
a
00
C0
G Gain
j
b
00
C0
B Gain
j
c
00
C0
R Cut
G Cut
B Cut
Warm
R Gain
j
d
00
C0
G Gain
j
e
00
C0
B Gain
j
f
00
C0
R Cut
G Cut
- 11 -
4.6.  Reference(White  Balance Adjustment 
coordinate and color temperature)
(1) Luminance: 204 Gray, 80IRE
(2)  Standard  color  coordinate  and  temperature  using 
CS-1000 (over 26 inch)
■ Direct LED & 32” POLA W/B adjust target value
■ 42” POLA LED W/B adjust target value (42LS3450 series)
5.  Tool Option setting & Inspection per 
countries
(1) Press 'IN START' key at Factory Service remote control.
(2) Select 'Tool Option 1'.
(3)  Punch in the number and press 'OK'. (Each of models has 
their number)
(4) Correct 'Tool Option2' ~ 'Tool Option5'. 
(5) Completed adjusting Tool option.
6. AUDIO output check
6.1. Audio input condition
(1) RF input: Mono, 1KHz sine wave signal, 100% Modulation
(2) CVBS, Component: 1KHz sine wave signal (0.4Vrms)
(3) RGB PC: 1KHz sine wave signal (0.7Vrms)
6.2. Specification
7. GND and HI-POT Test
7.1. GND & HI-POT auto-check preparation
(1)  Check  the  POWER  CABLE  and  SIGNAL  CABE  insertion 
condition
7.2. GND & HI-POT auto-check
(1)  Pallet moves in the station. (POWER CORD / AV CORD is 
tightly inserted)
(2) Connect the AV JACK Tester.
(3) Controller (GWS103-4) on.
(4) GND Test (Auto) 
     - If Test is failed, Buzzer operates.
     - If Test is passed, execute next process (Hi-pot test). 
       (Remove A/V CORD from A/V JACK BOX) 
(5) HI-POT test (Auto)
     - If Test is failed, Buzzer operates.
     -  If  Test  is  passed,  GOOD  Lamp  on  and  move  to  next 
process automatically.
7.3. Checkpoint
(1) Test voltage
      - GND: 1.5 KV / min at 100 mA
      - SIGNAL: 3 KV / min at 100 mA
(2) TEST time: 1 second
(3) TEST POINT
      -  GND Test = POWER CORD GND and SIGNAL CABLE 
GND.
      -  Hi-pot  Test  =  POWER  CORD  GND  and  LIVE  & 
NEUTRAL.
(4) LEAKAGE CURRENT: At 0.5 mArms
Target
(Direct 
LED)
Cool
Medium
Warm
x
y
x
y
x
y
271
276
287
296
315
332
Target
(Direct 
LED)
Cool
Medium
Warm
x
y
x
y
x
y
274
280
290
300
318
336
Mode
Color Temp
Color coordinate
Remark
Cool
(C50)
13,000 K
x = 0.269 (±0.002)
y = 0.273 (±0.002)
* Test signal
 -  Inner pattern for 
W/B adjust
 -  External white 
pattern
(80IRE, 204gray)
Medium
(0)
9,300 K
x = 0.285 (±0.002)
y = 0.293 (±0.002)
Warm
(W50)
6,500 K
x = 0.313 (±0.002)
y = 0.329 (±0.002)
Item
Min
Typ Max
Unit
Remark
Audio practical 
max Output, L/R
(Distortion=10% 
max Output)
4.5
5.0
6.0
W
Vrms
(1) Measurement condition
     - EQ/AVL/Clear Voice: Off
(2) Speaker (8Ω Impedance)
- 12 -
8. USB S/W Download
(optional, Service only)
(1) Put the USB Stick to the USB socket.
(2) Automatically detecting update file in USB Stick.
     -  If your downloaded program version in USB Stick is lower 
than that of TV set, it didn’t work. 
Otherwise USB data is automatically detected.
(3) Show the message “Copying files from memory”.
(4) Updating is starting.
(5) Updating Completed, The TV will restart automatically.
(6)  If  your TV  is  turned  on,  check  your  updated  version  and 
Tool option. (explain the Tool option, next stage)
*  If  downloading  version  is  more  high  than  your TV  have, 
TV  can  lost  all  channel  data.  In  this  case,  you  have  to 
channel recover. if all channel data is cleared, you didn't 
have a DTV/ATV test on production line.
* After downloading, have to adjust TOOL OPTION again.
1) Push "IN-START" key in service remote control.
2) Select "Tool Option 1" and push "OK" key.
3) Punch in the number. (Each model has their number.)
9. Optional adjustments
9.1. Manual ADC Calibration
■ Enter ‘EZ ADJUST’ mode by pressing ‘ADJ’ key.
key at ‘7. ADC Calibration’
► Caution :  Using  ‘P-ONLY’  key  of  the  Factory  Service 
remote control when turns TV on.
9.2. Manual White balance Adjustment
9.2.1. Adjustment condition and cautionary items
(1)  Lighting condition in surrounding area surrounding lighting 
should  be  lower  10  lux. Try  to  isolate  adj.  area  into  dark 
surrounding.
(2)  Probe location: Color Analyzer (CA-210) probe should be 
within 10cm and perpendicular of the module surface 
     (80°~ 100°)
(3) Aging time
1)  After Aging  Start,  Keep  the  Power  ON  status  during  5 
Minutes.
2)  In case of LCD, Back-light on should be checked using 
no signal or Full-white pattern.
9.2.2. Equipment
(1)  Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED: 
CH14)
(2)  Adj. Computer(During auto adj., RS-232C protocol is needed)
(3) Adjust Remot control
(4) Video Signal Generator MSPG-925F 720p/216-Gray 
     (Model: 217, Pattern: 78) 
9.2.3. Adjustment
(1) Set TV in Adj. mode using POWER ON.
(2)  Zero Calibrate the probe of Color Analyzer, then place it on 
the center of LCD module within 10cm of the surface.
(3)  Press ADJ  key  →  EZ  adjust  using  adj.  R/C  →  6.  White-
Balance then press the cursor to the right (Key►). When 
Key(►)  is  pressed  216  Gray  internal  pattern  will  be 
displayed.
(4)  One of R Gain / G Gain / B Gain should be fixed at 192, 
and the rest will be lowered to meet the desired value.
(5)  Adj. is performed in COOL, MEDIUM, WARM 3 modes of 
color temperature.
■  If internal pattern is not available, use RF input. In EZ Adj. 
menu 6.White Balance, you can select one of 2 Test-pattern: 
 ON,  OFF.  Default  is  inner(ON).  By  selecting  OFF,  you  can 
adjust using RF signal in 216 Gray pattern.
EZ ADJUST
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Tool Option Commercial
6. Country Group
7. Area Option
8. ADC Calibration   
9. White Balance
10. 10 Point WB
11. Test Pattern
12. EDID D/L
13. Sub B/C
14. Ext. Input Adjust
ADC Calibration
ADC Comp 480i
ADC Comp 1080p
ADC RGB
Start
NG
NG
NG
Reset
- 13 -
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