LG 42LT770H (CHASSIS:LA2FF) Service Manual ▷ View online
- 9 -
ⓔ
Checksum(LG TV): Changeable by total EDID data.
ⓔ
1
ⓔ
2
ⓔ
3
HDMI1
43
B1
X
HDMI2
43
A1
X
HDMI3
43
91
X
RGB
X
X
5C
ⓕ
Vendor Specific(HDMI)
INPUT
MODEL NAME(HEX)
HDMI1
67 03 0C 00 10 00 80 2D
HDMI2
67 03 0C 00 20 00 80 2D
HDMI3
67 03 0C 00 30 00 80 2D
4.6.4.2. PCM(US) _XvYcc : off
▪Reference
- HDMI1 ~ HDMI3 / RGB
- In the data of EDID, bellows may be different by S/W or Input
mode.
ⓐ
Product ID
HEX
EDID Table
DDC Function
0001
0100
Analog
0001
0100
Digital
ⓑ
Serial No: Controlled on production line.
ⓒ
Month, Year: Controlled on production line:
ex) Monthly : ‘01’ -> ‘01’
Year : ‘2012’ -> ‘16’
ⓓ
Model Name(Hex): LGTV
Chassis
MODEL NAME(HEX)
LA2FF
00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20
ⓔ
Checksum(LG TV): Changeable by total EDID data.
ⓔ
1
ⓔ
2
ⓔ
3
HDMI1
43
B5
X
HDMI2
43
A5
X
HDMI3
43
95
X
RGB
X
X
5C
ⓕ
Vendor Specific(HDMI)
INPUT
MODEL NAME(HEX)
HDMI1
67 03 0C 00 10 00 80 2D
HDMI2
67 03 0C 00 20 00 80 2D
HDMI3
67 03 0C 00 30 00 80 2D
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.
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
- 10 -
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
5.1.6. 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)
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
0.269
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)
(1) LGD
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
(2) O/S Module(AUO, CMI, Sharp,IPS…)
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
▪ Standard color coordinate and temperature using
CA-210(CH-14) – by aging time
(1) Edge LED models (applied only LGD Module) in LGERS
GP4
Aging time
(Min)
Cool
Medium
Warm
X
Y
X
Y
X
Y
269
273
285
293
313
329
1
0-2
279
288
295
308
319
338
2
3-5
278
286
294
306
318
336
3
6-9
277
285
293
305
317
335
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
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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5.2. Tool Option selection
▪ Method: Press Adj. key on the Adj. R/C, then select Tool
option
Model
32LT770H-UA 37LT770H-UA 42LT770H-UA 47LT770H-UA 55LT770H-UA
tool option 1
4100
5
6
7
tool option 2
8389
8389
8389
8389
tool option 3
9229
9229
9229
9229
tool option 4
13006
13006
13004
13004
tool option 5
4315
4187
4187
4187
tool option 6
1305
1305
1305
1305
Tool option 7
128
128
4224
4224
Commercial Tool
Option
1555
1555
1555
1555
Country Group
02
02
02
02
● Tool option can be reconstructed by Software
5.3. 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.
5.4. Wi-Fi MAC Address Check
5.4.1. Using RS232 Command
Command
Set ACK
Transmission
[A][l][][Set ID][][20][Cr] [O][K][x] or [N][G]
5.4.2. Check the menu on in-start
5.5. Wi-Fi Test
Step 1) Turn on TV
Step 2) Select Network Connection option in Network Menu.
Installer menu -> 119 -> 253 -> Menu
Step 3) Select Start Connection Button in Network Connection.
<Step 2>
<Step 5>
<Step 6>
<Step 3>
<Step 4>
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Step 4) If the system finds any AP like blow PIC, it is working
well
5.6. HDMI ARC Function Inspection
5.6.1. Test equipment
- Optic Receiver Speaker
- MSHG-600 (SW: 1220 ↑)
- HDMI Cable (for 1.4 version)
5.6.2. Test method
(1) Insert the HDMI Cable to the HDMI ARC port from the
master equipment (HDMI1)
(2) Check the sound from the TV Set
(3) Check the Sound from the Speaker or using AV & Optic
TEST program (It’s connected to MSHG-600)
* Remark: Inspect in Power Only Mode and check SW version
in a master equipment
6. Check Commercial features
Model info.
Commercial Feature
Name
inch
IR Out
DC
Power
Out
(12V)
Ext
SPK
Out
RJP
(RJ-45
inter-
face)
Pro:Idiom
LT770H-UA 32/37/42/47/55
O
O
O
O
O
6.1. External SPK Out
6.1.1. Equipment & Condition
▪ Jig (Speaker out JIG) or Oscilloscope
▪ Power only mode
6.1.2. Check the speaker out
1) Connect the External Speaker : check the sound
Connect oscilloscope, you can see this waveform
6.2. IR Out and DC Power Outlet (12V)
6.2.1. Equipment & Condition
▪ Jig (commercial check JIG)
▪ Special 232C Cable for commercial check Jig
▪ Power only mode
▪ PCB Mode (installer menu -> 118 -> 9 )
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