55LM4700 (CHASSIS:LA21B) — LG TV Service Manual (repair manual). Page 11

View LG 55LM4700 (CHASSIS:LA21B) Service Manual online

- 11 -
5. Final Assembly Adjustment
5.1. White Balance Adjustment
5.1.1. Overview
5.1.1.1. 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
- Surrounding Temperature: 25±5 ºC
- Warm-up time: About 5 Min
- Surrounding Humidity: 20% ~ 80%
-  Before  White  balance  adjustment,  Keep  power  on  status, 
don’t power off
5.1.1.2. 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  10cm  and  perpendicular  of  the  module  surface  
(80°~ 100°)
(3) Aging time
-  After  Aging  Start,  Keep  the  Power  ON  status  during  5 
Minutes.
-  In  case  of  LCD,  Back-light  on  should  be  checked  using  no 
signal or Full-white pattern.
5.1.2. 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)
      → Only when internal pattern is not available
     ※  Color  Analyzer  Matrix  should  be  calibrated  using 
CS-1000
5.1.3. Equipment connection
5.1.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj
RS-232C COMMAND
Explanation
CMD
DATA
ID
Wb
00
00
Begin White Balance adj.
Wb
00
ff
End White Balance adj. 
(internal pattern disappears )
(2) Adjustment Map
Adj. item
Command
(lower case ASCII)
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
Color Analyzer 
Computer 
Pattern Generator 
 
Signal Source 
Probe 
RS-232C 
RS-232C 
RS-232C 
If TV internal pattern is used, not needed 
- 12 -
5.1.5. Adjustment method
5.1.5.1. 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.
5.1.5.2. Manual adj. method
(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  204  Gray(80IRE)  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.
5.1.6.  Reference (White Balance Adj. coordinate and 
color temperature)
▪ Luminance: 204 Gray, 80IRE
** Lamp Module
▪  Standard  color  coordinate  and  temperature  using  CS-1000 
(over 26 inch)
Mode
Coordinate
Temp
uv
X
Y
Cool
0.269
0.273
13,000K
0.0000 
Medium
0.285
0.293
9,300K
0.0000 
Warm
0.313
0.329
6,500K
0.0000 
▪  Standard  color  coordinate  and  temperature  using 
CA-210(CH 14)
Mode
Coordinate
Temp
uv
X
Y
Cool
0.269±0.002
0.273±0.002
13,000K
0.0000 
Medium
0.285±0.002
0.293±0.002
9,300K
0.0000 
Warm
0.313±0.002
0.329±0.002
6,500K
0.0000 
**  Only  Edge-LED  OS(AUO,CMI,IPS,Sharp)  Module  except 
AUO 65”
▪  Standard  color  coordinate  and  temperature  using  CS-1000 
(over 26 inch) 
Mode
Coordinate
Temp
uv
X
Y
Cool
0.271
0.276
13,000K
0.0000 
Medium
0.287
0.296
9,300K
0.0000 
Warm
0.315
0.332
6,500K
0.0000 
▪  Standard  color  coordinate  and  temperature  using 
CA-210(CH 14)
Mode
Coordinate
Temp
uv
X
Y
Cool
0.271±0.002
0.276±0.002
13,000K
0.0000 
Medium
0.287±0.002
0.296±0.002
9,300K
0.0000 
Warm
0.315±0.002
0.332±0.002
6,500K
0.0000 
** Only Edge-LED LGD Module
▪  Standard  color  coordinate  and  temperature  using 
CA-210(CH-14) – by aging time
GP3
Aging time
(Min)
Cool
Medium
Warm
X
Y
X
Y
X
Y
269
273
285
293
313
329
1
0-2
280
287
296
307
320
337
2
3-5
279
286
295
305
319
335
3
6-9
277
284
292
304
317
334
4
10-19
276
283
292
303
316
333
5
20-35
274
280
290
300
314
330
6
36-49
272
277
288
297
312
327
7
50-79
271
275
287
295
311
325
8
80-149
270
274
286
294
310
324
9
Over 150
269
273
285
293
309
323
- 13 -
5.2. Option selection per country
5.2.1. Overview
(1)  Tool  option  selection  is  only  done  for  models  in  Non-USA 
(2)  Applied  model:  LA02D  and  LA02E  Chassis  applied  to 
CANADA and MEXICO
5.2.2. Country Group selection
(1)  Press ADJ  key  on  the Adj.  R/C,  and  then  select  Country 
Group Menu
(2)  Depending  on  destination,  select  KR  or  US,  then  on  the 
lower Country option, select US, CA, MX.
     Selection is done using +, - KEY
5.2.3. Tool Option inspection
▪ Press Adj. key on the Adj. R/C, then select Tool option.
Model
Module
Tool 1
Tool 2
Tool 3
Tool 4
Tool 5
47LM4600-UC
LGD
32855
2423
10523 29612
7170
55LM4600-UC
LGD
32857
2423
11547
29612
7170
32LS5600-UA
LGD
16725
2423
10523 29612
7202
37LS5600-UC
LGD
16725
2423
9499
29612
7202
47LS5600-UC
AUO
20823
2423
9499
29612
7218
55LS5600-UC
LGD
20825
2423
9499
29612
7170
55LS5600-UC
AUO
20825
2423
9499
29612
7218
6. GND and HI-POT Test
6.1. GND & HI-POT auto-check preparation
(1)  Check  the  POWER  CABLE  and  SIGNAL  CABE  insertion 
condition
6.2. 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.
6.3. Checkpoint
(1) Test voltage
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
(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 0.5mArms
7. AUDIO output check
7.1. 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)
7.2. Specification
No
Item
Min
Typ
Max
Unit
Remark
1
Audio 
practical 
max Output, 
L/R
9.0
8.5
10.0
8.9
12.0
9.9
W
Vrms
(1)  Measurement 
condition
   -  EQ/AVL/Clear 
Voice: Off
(2)  Speaker (8Ω 
Impedance)
8. EYE-Q Check  
Step 1) Turn on the TV..
Step 2)  Press  'EYE  button'  on  the  adjustment  remote-
controller.
Step 3)  Cover  'Eye  Q  sensor'  on  the  front  of  set  with  your 
hands, hold it for 6 seconds.
Step 4)  Check "the Sensor Data" on the screen, make certain 
that  Data  is  below  10.  If  Data  isn’t  below  10  in  6 
seconds,  Eye  Q  sensor  would  be  bad.  You  should 
change Eye Q sensor.
Step 5)  Uncover  your hands  from Eye Q sensor, hold  it for 6 
seconds.
Step 6)  Check  "Back  Light(xxx)"  on  the  screen,  check  data 
increase . You should change Eye Q sensor. 
 
<Step 2>
<Step 5>
<Step 6>
<Step 3>
<Step 4>
- 14 -
9. 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”
(5) Updating Completed, The TV will restart automatically
(6)  If  your TV  is  turned  on,  check  your  updated  version  and 
Tool option. 
*  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, TOOL OPTION setting is needed again.
(1) Push "IN-START" key in service remote controller.
(2) Select "Tool Option 1" and Push “OK” button.
(3) Punch in the number. (Each model has their number.)
(4) Updating is staring.
- 15 -
TROUBLE SHOOTING
1. Power-up boot check
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST
Check Power connector
Main B/D 3.5V Line
Short Check
Check X201 clock
24 MHz
Replace X201
Check P403 PWR_ON.
1pin : 3.3V
Replace Mstar(IC101) or Main board
Check Multi Voltage
P403 2pin:24V  ,17pin:12V
Replace Power Board
Check Inverter Control & Error Out 
P403 18 pin : High
P403 24 pin : low
Check Power Board or Module
Check IC402/3/7 Output Voltage
IC402 : 2.5V
IC403 : 1.1V
IC407 : 1.5V
Q403 : 3.3V
Replace IC402/3/7, Q403
Re-download software.
Check Micom Voltage
L404 : +3.5V
Replace L404
Check LVDS Power Voltage
Q409 : 12V
Replace Q409
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
Change Module
ok
ok
ok
ok
ok
ok
ok
ok
ok
No
No
ok
Replace Power board.
ok
No
No
No
No
No
No
No
No

Click on the first or last page to see other 55LM4700 (CHASSIS:LA21B) service manuals if exist.