LG 42LN5200 (CHASSIS:LT36M) Service Manual ▷ View online
- 11 -
4. Total Assembly line process
4.1. Adjustment Preparation
■ W/B Equipment condition
CA210 : CH14, Test signal : Inner pattern (80IRE) – in case of
LED back light
■ Above 5 minutes H/run in the inner pattern. (“power on” key of
adjust remote control)
► The spec of color temperature and coordinate
Model
Mode
Color Temp
Color coordinate
Remark
All
Cool (C50)
13,000k
x = 0.271 (±0.002)
y = 0.270 (±0.002)
※
Test signal
- Inner pattern for W/B adjust
- External white pattern
(80IRE, 204gray)
Medium (0)
9,300k
x = 0.286 (±0.002)
y = 0.289 (±0.002)
Warm (W50)
6,500k
x = 0.313 (±0.002)
y = 0.329 (±0.002)
► CA210 : CH 14, Test signal : Inner pattern (80IRE)
- Standard color coordinate and temperature using CA-1000 (by
H/R time)
▪ Normal line
model: (normal line)LN5xxx, LA6xxx, LA7xxx, LA8xxx
H/R Time(Min)
Cool
Medium
Warm
x
y
x
x
y
x
271
270
286
289
313
329
1
0-2
283
287
298
306
322
342
2
3-5
282
285
297
304
321
340
3
6-9
281
284
296
303
320
339
4
10-19
279
281
294
300
318
336
5
20-35
277
277
292
296
316
332
6
36-49
275
274
290
293
314
329
7
50-79
273
272
288
291
312
327
8
80-119
272
271
287
290
311
326
9
Over 120
271
270
286
289
310
325
▪ Aging chamber line
model: (aging chamber)LN5xxx, LA6xxx, LA7xxx, LA8xxx
H/R Time(Min)
Cool
Medium
Warm
x
y
x
x
y
x
271
270
285
293
313
329
1
0-5
280
285
294
308
319
340
2
6-10
276
280
290
303
315
335
3
11-20
272
275
286
298
311
330
4
21-30
269
272
283
295
308
327
5
31-40
267
268
281
291
306
323
6
41-50
266
265
280
288
305
320
7
51-80
265
263
279
286
304
318
8
81-119
264
261
278
284
303
316
9
Over 120
264
260
278
283
303
315
※
Connecting picture of the measuring instrument
(On Automatic control)
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push Adjustment R/C POWER-ON -> Enter
the mode of White-Balance, the pattern will come out.
●
Auto-control interface and directions
(1) Adjust in the place where the influx of light like floodlight
around is blocked. (Illumination is less than 10ux).
(2) Adhere closely the Color Analyzer ( CA210 ) to the module
less than 10cm distance, keep it with the surface of the
Module and Color Analyzer’s Prove vertically.(80~100°).
(3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 5 minutes.
- Using ‘no signal’ or ‘full white pattern’ or the others, check
the back light on.
● Auto adjustment Map(RS-232C)
RS-232C COMMAND
[ CMD ID DATA ]
Wb 00 00 White Balance Start
Wb 00 ff White Balance End
RS-232C COMMAND
[CMD ID DATA]
MIN
CENTER
(DEFAULT)
MAX
Cool
Mid
Warm
Cool
Mid
Warm
R Gain
jg
Ja
jd
00
172
192
192
192
G Gain
jh
Jb
je
00
172
192
192
192
B Gain
ji
Jc
jf
00
192
192
172
192
R Cut
64
64
64
128
G Cut
64
64
64
128
B Cut
64
64
64
128
- 12 -
*Manual W/B process using adjusts Remote control.(TBD)
■ Color analyzer(CA100+, CA210) should be used in the
calibrated ch by CS-1000
■ Operate the zero-calibration of the CA100+ or CA-210, then
stick sensor to the module when adjusting.
■ After enter Service Mode by pushing “ADJ” key,
■Enter White Balance by pushing “►” key at “8. White Balance”.
■ For manual adjustment, it is also possible by the following
sequence.
(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 -> 8. White-
Balance then press the cursor to the right (KEY►). When
KEY(►) is pressed 206 Gray internal pattern will be displayed.
(4) Adjust Cool modes
(i). Fix the one of R/G/B gain to 192 (default data) and decrease
the others
(If G gain is adjusted over 172 and R and B gain less than
192, increase G gain to 192 and increase R gain and B gain
same amount of increasing G gain.)
(ii). If G gain is less than 172,
Increase G gain by up to 172, and then increase R gain and
G gain same amount of increasing G gain.
(iii). If R gain or B gain is over 255,
Readjust G gain less than 172, Conform to R gain is 255 or B
gain is 255
(5) Adjust two modes (Medium / Warm) Fix the one of R/G/B gain
to 192 (default data) and decrease the others.
(6) Adj. is completed, Exit adjust mode using “EXIT” key on
Remote controller.
▪ If internal pattern is not available, use RF input. In EZ Adj. menu
8. 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 206 Gray pattern.
※
CASE Cool
First adjust the coordinate far away from the target value(x, y).
(1) x, y > target
i) Decrease the R, G.
(2) x, y < target
i) First decrease the B gain,
ii) Decrease the one of the others.
(3) x > target , y< target
i) First decrease B, so make y a little more than the target.
ii) Adjust x value by decreasing the R
(4) x < target , y >target
i) First decrease B, so make x a little more than the target.
ii) Adjust x value by decreasing the G
How to adjust
(1) If G gain is adjusted over 172 and R gain and B gain less
than 192 , Adjust is O.K.
(2) If G gain is less than 172 , increase G gain by up to 172,
and then increase R gain and B gain same amount of
increasing G gain.
(3) If R gain or B gain is over 255 , Readjust G gain less than
172, Conform to R gain is 255 or B gain is 255
※
CASE Medium / Warm
First adjust the coordinate far away from the target value(x, y).
(1) x, y > target
i) Decrease the R, G.
(2) x, y < target
i) First decrease the B gain,
ii) Decrease the one of the others.
(3) x > target , y< target
i) First decrease B, so make y a little more than the target.
ii) Adjust x value by decreasing the R
(4) x < target , y >target
i) First decrease B, so make x a little more than the target.
ii) Adjust x value by decreasing the G
▪ After You finish all adjustments, Press “In-start” button and
compare Tool option and Area option value with its BOM, if it is
correctly same then unplug the AC cable. If it is not same, then
correct it same with BOM and unplug AC cable. For correct it to
the model’s module from factory JIG model.
▪ Push the “IN STOP KEY” after completing the function
inspection.
- 13 -
4.2. DPM operation confirmation
(Only Apply for MNT Model)
Check if Power LED Color and Power Consumption operate
as standard.
■ Set Input to RGB and connect D-sub cable to set
■ Measurement Condition: (100~240V@ 50/60Hz)
■ Confirm DPM operation at the state of screen without Signal
4.3. DDC EDID Write (HDMI 256Byte)
■ Connect HDMI Signal Cable to HDMI Jack.
■ Write EDID DATA to EEPROM(24C02) by using DDC2B
protocol.
■ Check whether written EDID data is correct or not.
* For SVC Ass’y, EDID have to be downloaded.
4.4. EDID DATA
1) All Data : HEXA Value
2) Changeable Data :
*: Serial No : Controlled / Data:01
**: Month : Controlled / Data:00
***:Year : Controlled
****:Check sum
- Auto Download
■ After enter Service Mode by pushing “ADJ” key,
■ Enter EDID D/L mode.
■ Enter “START” by pushing “OK” key.
※
Edid data and Model option download (RS232C)
NO
Item
CMD 1 CMD 2
Data 0
Enter
download
MODE
Download
‘Mode In’
A
A
0
0
When transfer
the ‘Mode In’,
Carry the com-
mand
Edid data
and Model
option
download
Download
A
E
00
10
Automatically
download
(The use of a
internal Data)
※
Caution
* Use the proper signal cable for EDID Download
- Analog EDID : Pin3 exists
- Digital EDID : Pin3 exists
=> Caution
- Never connect HDMI & D-sub Cable at the same time.
- Use the proper cables below for EDID Writing.
- Download HDMI1, HDMI2 separately because HDMI1 is
different from HDMI2.
For Analog EDID
For HDMI EDID
D-sub to D-sub
DVI-D to HDMI or HDMI to HDMI
No.
Item
Condition
Hex Data
1
Manufacturer ID
GSM
1E6D
2
Version
Digital : 1
01
3
Revision
Digital : 3
03
●
EDID DATA
(1) FHD 2D EDID Data
CheckSum
Physical Address (0x9E)
HDMI 1
42/25
10
HDMI 2
42/15
20
- 14 -
4.5. V-COM Adjust (Only CDMS Module)
■ Why need Vcom adjustment?
The Vcom (Common Voltage) is a Reference Voltage of
Liquid Crystal Driving.
→ Liquid Crystal need for Polarity Change with every frame.
- Adjust sequence
■ Press “P-only” key, enter to power only mode. And Press
“yellow” key to enter module inspection mode. After then,
Press “number 0” key, Flicker Pattern is displayed.
(Or After enter Service Mode by pushing “ADJ” key, then
Enter V-Com Adjust mode by pushing “►” key at “13.
V-Com”)
■ As pushing the right or the left button on the remote
controller, And find the V-COM value Which is no or
minimized the Flicker.
(If there is no flicker at default value, Press “P-only” key and
finish the VCOM adjustment.)
■ Push the OK key to store value. Then the message “Saving
OK” is pop.
■ Press the “P-only” key to finish VCOM adjustment.
4.6. Outgoing condition Configuration
■ When pressing IN-STOP key by SVC remocon, Red LED
are blinked alternatively. And then automatically turn off.
(Must not AC power OFF during blinking)
4.7. GND & Hi-pot test
4.7.1. GND & HI-POT auto-check preparation
(1) Check the POWER CABLE and SIGNAL CABE insertion
condition
4.7.2. 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.
4.7.3. Checkpoint
(1) Test voltage
①
①
3 Poles
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
②
②
2 Poles
- SIGNAL: 3KV/min at 100mA
(2) TEST time: 1 second
(3) TEST POINT
①
①
3 Poles
- GND Test = POWER CORD GND and SIGNAL CABLE
GND.
- Hi-pot Test = POWER CORD GND and LIVE & NEUTRAL.
②
②
2 Poles
- Hi-pot Test = Accessible Metal and LIVE & NEUTRAL.
(4) LEAKAGE CURRENT: At 0.5mArms
5. Local Dimming Function Check
Step1) Turn on TV.
Step2) Press “P-only” key, enter to power only mode and
escape the “P-only” Mode by pressing “Exit” key
Step3) Press “Tilt” key, entrance to Local Dimming mode.
Step4) At the Local Dimming mode, module Edge Backlight
moving Top to bottom Back light of module moving
Step5) confirm the Local Dimming mode
Step6) Press “Exit” key
Row Line
Column Line
C
LC
C
ST
Panel
S
Y
S
T
E
Y
S
T
E
M
Gate Dri
ve
I
I
C
Source Drive IC
Circuit Block
Timing
Controller
Power
Block
V
COM
Gamma
Reference Voltage
Gamma Reference
Voltage
Data(R,G,B) & Control signal
Control signal
Data(R,G,B) &
Control signal
Interfac
e
TFT
Power Input
Power Input
Data Input
Data Input
V
COM
Liquid
Crystal
V
COM
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