LG 55LA7900 (CHASSIS:LA34D) Service Manual ▷ View online
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4.3. LAN port Inspection (Ping Test)
4.3.1. Equipment setting
1) Play the LAN Port Test PROGRAM.
2) Input IP set up for an inspection to Test Program.
- IP number: 12.12.2.2
4.3.2. LAN PORT inspection (PING TEST)
1) Play the LAN Port Test Program.
2) Connect each other LAN Port Jack.
3) Play Test (F9) button and confirm OK Message.
4) Remove LAN CABLE
4.4. EDID Download
4.4.1 Overview
▪ It is a VESA regulation. A PC or a MNT will display an
optimal resolution through information sharing without any
necessity of user input. It is a realization of “Plug and Play”.
necessity of user input. It is a realization of “Plug and Play”.
4.4.2 Equipment
▪ Since embedded EDID data is used, EDID download JIG,
HDMI cable and D-sub cable are not need.
▪ Adjust remocon
4.4.3 Download method
1) Press Adj. key on the Adj. R/C,
2) Select EDID D/L menu.
3) By pressing Enter key, EDID download will begin
4) If Download is successful, OK is display, but If Download is
failure, NG is displayed.
5) If Download is failure, Re-try downloads.
※
Caution) When EDID Download, must remove RGB/HDMI
Cable.
4.4.4. EDID DATA(PCM)
# HDMI 1(C/S : E8 B1)
EDID Block 0, Bytes 0-127 [00H-7FH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 01 17 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26
20 | 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80
30 | 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 | 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30
50 | 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A
60 | 3E 1E 53 10 00 0A 20 20 20 20 20 20 00 00 00 FC
70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 E8
EDID Block 1, Bytes 128-255 [80H-FFH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------
0 | 02 03 2e f1 48 90 22 20 05 04 03 02 01 23 09 57
10 | 07 78 03 0c 00 10 00 b8 2d 20 c0 0e 01 4f 00 fe
20 | 08 10 06 10 18 10 28 10 38 10 e3 05 03 01 02 3a
30 | 80 18 71 38 2d 40 58 2c 45 00 40 84 63 00 00 1e
40 | 01 1d 80 18 71 1c 16 20 58 2c 25 00 40 84 63 00
50 | 00 9e 01 1d 00 72 51 d0 1e 20 6e 28 55 00 40 84
60 | 63 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b1
# HDMI 2(C/S : E8 A1)
EDID Block 0, Bytes 0-127 [00H-7FH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 01 17 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26
20 | 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80
30 | 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 | 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30
50 | 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A
60 | 3E 1E 53 10 00 0A 20 20 20 20 20 20 00 00 00 FC
70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 E8
EDID Block 1, Bytes 128-255 [80H-FFH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------
0 | 02 03 2e f1 48 90 22 20 05 04 03 02 01 23 09 57
10 | 07 78 03 0c 00 20 00 b8 2d 20 c0 0e 01 4f 00 fe
20 | 08 10 06 10 18 10 28 10 38 10 e3 05 03 01 02 3a
30 | 80 18 71 38 2d 40 58 2c 45 00 40 84 63 00 00 1e
40 | 01 1d 80 18 71 1c 16 20 58 2c 25 00 40 84 63 00
50 | 00 9e 01 1d 00 72 51 d0 1e 20 6e 28 55 00 40 84
60 | 63 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A1
- 14 -
# HDMI 3(C/S : E8 91)
EDID Block 0, Bytes 0-127 [00H-7FH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 01 17 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26
20 | 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80
30 | 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 | 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30
50 | 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A
60 | 3E 1E 53 10 00 0A 20 20 20 20 20 20 00 00 00 FC
70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 E8
EDID Block 1, Bytes 128-255 [80H-FFH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------
0 | 02 03 2e f1 48 90 22 20 05 04 03 02 01 23 09 57
10 | 07 78 03 0c 00 30 00 b8 2d 20 c0 0e 01 4f 00 fe
20 | 08 10 06 10 18 10 28 10 38 10 e3 05 03 01 02 3a
30 | 80 18 71 38 2d 40 58 2c 45 00 40 84 63 00 00 1e
40 | 01 1d 80 18 71 1c 16 20 58 2c 25 00 40 84 63 00
50 | 00 9e 01 1d 00 72 51 d0 1e 20 6e 28 55 00 40 84
60 | 63 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 91
# HDMI 4(C/S : E8 81)
EDID Block 0, Bytes 0-127 [00H-7FH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 01 17 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26
20 | 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80
30 | 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 | 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30
50 | 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A
60 | 3E 1E 53 10 00 0A 20 20 20 20 20 20 00 00 00 FC
70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 E8
EDID Block 1, Bytes 128-255 [80H-FFH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------
0 | 02 03 2e f1 48 90 22 20 05 04 03 02 01 23 09 57
10 | 07 78 03 0c 00 40 00 b8 2d 20 c0 0e 01 4f 00 fe
20 | 08 10 06 10 18 10 28 10 38 10 e3 05 03 01 02 3a
30 | 80 18 71 38 2d 40 58 2c 45 00 40 84 63 00 00 1e
40 | 01 1d 80 18 71 1c 16 20 58 2c 25 00 40 84 63 00
50 | 00 9e 01 1d 00 72 51 d0 1e 20 6e 28 55 00 40 84
60 | 63 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 81
4.5. Camera Port Inspection
(1) Objective : To check PCBA’s CAMERA Port.
(2) How-it-works
i) Connect the PCBA like below Picture.
ii) Send specific RS-232C Command for displaying Camera
Preview.
* CAMERA need to be status of Slide up.
(3) RS-232C Command
RS-232C COMMAND
Explanation
CMD
DATA
ID
Ai
00
23
Camera Function Start.
Ai
00
24
Camera Function End.
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 °C
- 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.
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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)
※
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 caseASCII)
Data Range
(Hex.)
CMD1
CMD2
MIN
MAX
Cool
R Gain
j
g
00
C0
G Gain
j
h
00
C0
B Gain
j
i
00
C0
Medium
R Gain
j
a
00
C0
G Gain
j
b
00
C0
B Gain
j
c
00
C0
Warm
R Gain
j
d
00
C0
G Gain
j
e
00
C0
B Gain
j
f
00
C0
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. LED White balance table
(1) Cool Mode
- Purpose : Especially G-gain fix adjust leads to the
luminance enhancement. Adjust the color temperature to
reduce the deviation of the module color temperature.
- Principle : To adjust the white balance without the
saturation, Adjust the G gain more than 172 ( If R gain or G
gain is more than 255 , G gain can adjust less than 172 )
and change the others ( R/B Gain ).
- Adjustment mode : mode – Cool
(2) Medium / Warm Mode
- Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
- 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.
- Adjustment mode : Two modes – Medium / Warm
5.1.6. Reference (White Balance Adj. coordinate and
color temperature)
(1) Luminance: 204 Gray, 80IRE
(2) Standard color coordinate and temperature using CS-1000
(over 26 inch)
Color Analyzer
Computer
Pattern Generator
※
Signal Source
Probe
RS-232C
RS-232C
RS-232C
※
If TV internal pattern is used, not needed
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5.1.7. Reference (White Balance Adj. coordinate and
color temperature)
▪ Luminance: 204 Gray
▪ Standard color coordinate and temperature using CS-1000
(over 26 inch)
Mode
Coordinate
Temp
△
uv
X
Y
Cool
0.271
0.270
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 18) – ALEF
Mode
Coordinate
Temp
△
uv
X
Y
Cool
0.271±0.002
0.270±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
+0.0030
▪ Standard color coordinate and temperature using
CA-210(CH-14)
Mode
Coordinate
Temp
△
uv
X
Y
Cool
0.271±0.002
0.270±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
▪ Standard color coordinate and temperature using
CA-210(CH-14) – by aging time
5.1.8. ALELF&EDGE&POLA LED&IOL White balance
table
▪ Edge LED module change color coordinate because of aging
time
▪ Apply under the color coordinate table, for compensated
aging time
(1) Normal line (LN5xxx, LA6xxx, LA7xxx, LA8xxx)
GP4 Aging time
(Min)
Cool
Medium
Warm
X
Y
X
Y
X
Y
271
270
285
293
313
329
1
0-2
281 287 295
310
320
342
2
3-5
280 285 294
308
319
340
3
6-9
278 284 292
307
317
339
4
10-19
276 281 290
304
315
336
5
20-35
275 277 289
300
314
332
6
36-49
274 274 288
297
313
329
7
50-79
273 272 287
295
312
327
8
80-119
272 271 286
294
311
326
9
Over 120
271 270 285
293
310
325
(2) Aging chamber(LN5xxx, LA6xxx, LA7xxx, LA8xxx)
GP4 Aging time
(Min)
Cool
Medium
Warm
X
Y
X
Y
X
Y
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
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