LG 26LN41XX / 26LN4100 / 26LN4110 / 26LN4130 / 26LN4140 (CHASSIS:LM91M) Service Manual ▷ View online
- 9 -
ADJUSTMENT INSTRUCTION
1. Application Range
This specification sheet is applied to all of the LED TV with
LM91M chassis.
2. Designation
(1) Because this is not a hot chassis, it is not necessary to
use an isolation transformer. However, the use of isolation
transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of
25 °C ± 5 °C of temperature and 65 % ± 10 % of relative
humidity if there is no specific designation.
(4) The input voltage of the receiver must keep 100-220 V,
50/60Hz.
(5) The receiver must be operated for over 5 minutes prior to
the adjustment when module is in the circumstance of
above 15 °C.
► In case of keeping module is in the circumstance of 0
°C, it should be placed in the circumstance of above 15
°C for 2 hours.
► In case of keeping module is in the circumstance of
below -20 °C, it should be placed in the circumstance of
above 15 °C for 3 hours.
* Caution
When a still image is displayed for 20 minutes or longer
(especially where W/B scale is strong. Digital pattern 13ch
and/or Cross hatch pattern 09ch), there can some
afterimage in the black level area.
3. MAIN PCBA Adjustments
3.1. ADC Calibration
3.1.1. Using D/L Jig
- An ADC calibration is automatically adjusted from DFT-Jig
- If it needs to adjust manually, refer to appendix.
* ADC Calibration Protocol (RS232)
Adjust Sequence
▪ aa 00 00 [Enter Adjust Mode]
▪ xb 00 40 [Component1 Input (480i)]
▪ ad 00 10 [Adjust 480i Comp1]
▪ aa 00 90 End Adjust mode
3.2. EDID Download
▪ HD MODEL
▪ 8BIT FHD MODEL
a. White Balance Adjustment
NO
Item
CMD 1 CMD 2 Data 0
Enter Adjust
MODE
Adjust
‘Mode In’
A
A
0
0
When transfer the ‘Mode In’,
Carry the command.
ADC adjust
ADC
Adjust
A
D
1
0
Automatically adjustment
(The use of a internal pattern)
** HDMI 1 : 256Bytes
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 F3 30 A4 54 46 96 26
20 0F 49 4B 21 08 00 45 40 01 01 61 40 01 01 01 01
30 01 01 01 01 01 01 01 1D 00 72 51 D0 1E 20 6E 28
40 55 00 C4 8E 21 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 BC 77 21 00 00 1C 00 00 00 FC 00 4C
60 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD
70 00 3A 3F 1C 44 0F 00 0A 20 20 20 20 20 20 01 ⓐ
80 02 03 28 F1 4F 84 07 01 16 02 03 11 12 13 14 05
90 20 22 1F 10 26 11 07 50 09 7F 07 83 01 00 00 68
20 0F 49 4B 21 08 00 45 40 01 01 61 40 01 01 01 01
30 01 01 01 01 01 01 01 1D 00 72 51 D0 1E 20 6E 28
40 55 00 C4 8E 21 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 BC 77 21 00 00 1C 00 00 00 FC 00 4C
60 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD
70 00 3A 3F 1C 44 0F 00 0A 20 20 20 20 20 20 01 ⓐ
80 02 03 28 F1 4F 84 07 01 16 02 03 11 12 13 14 05
90 20 22 1F 10 26 11 07 50 09 7F 07 83 01 00 00 68
A0 03 0C 00 10 00 80 1E 00 01 1D 00 80 51 D0 1C 20
B0 40 80 35 00 BC 88 21 00 00 1E 8C 0A D0 8A 20 E0
C0 2D 10 10 3E 96 00 13 8E 21 00 00 18 8C 0A A0 14
D0 51 F0 16 00 26 7C 43 00 C4 8E 21 00 00 98 01 1D
E0 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00 00 9E
F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ⓐ
B0 40 80 35 00 BC 88 21 00 00 1E 8C 0A D0 8A 20 E0
C0 2D 10 10 3E 96 00 13 8E 21 00 00 18 8C 0A A0 14
D0 51 F0 16 00 26 7C 43 00 C4 8E 21 00 00 98 01 1D
E0 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00 00 9E
F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ⓐ
** HDMI 1 : 256Bytes
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 D9 B0 A3 57 49 9C 25
20 11 49 4B 21 08 00 01 01 45 40 61 40 01 01 81 80
30 01 01 D1 C0 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 45 00 08 44 21 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 BC 88 21 00 00 1C 00 00 00 FC 00 4C
60 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD
70 00 3A 3F 1C 44 0F 00 0A 20 20 20 20 20 20 01 ⓐ
80 02 03 28 F1 4F 90 07 01 16 02 03 11 12 13 04 14
90 05 20 22 1F 26 11 07 50 09 7F 07 83 01 00 00 68
20 11 49 4B 21 08 00 01 01 45 40 61 40 01 01 81 80
30 01 01 D1 C0 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 45 00 08 44 21 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 BC 88 21 00 00 1C 00 00 00 FC 00 4C
60 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD
70 00 3A 3F 1C 44 0F 00 0A 20 20 20 20 20 20 01 ⓐ
80 02 03 28 F1 4F 90 07 01 16 02 03 11 12 13 04 14
90 05 20 22 1F 26 11 07 50 09 7F 07 83 01 00 00 68
A0 03 0C 00 10 00 80 1E 00 01 1D 00 80 51 D0 1C 20
B0 40 80 35 00 BC 88 21 00 00 1E 8C 0A D0 8A 20 E0
C0 2D 10 10 3E 96 00 13 8E 21 00 00 18 8C 0A A0 14
D0 51 F0 16 00 26 7C 43 00 C4 8E 21 00 00 98 01 1D
E0 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00 00 9E
F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ⓐ
B0 40 80 35 00 BC 88 21 00 00 1E 8C 0A D0 8A 20 E0
C0 2D 10 10 3E 96 00 13 8E 21 00 00 18 8C 0A A0 14
D0 51 F0 16 00 26 7C 43 00 C4 8E 21 00 00 98 01 1D
E0 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00 00 9E
F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ⓐ
EDID C/S data
HD
FHD (8Bit)
HDMI
HDMI
Check sum
(Hex)
Block 0
A5
C1
Block 1
44(HDMI1)
44 (HDMI1)
34(HDMI2)
34 (HDMI2)
- 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
- If Model is Polaris Model, G-gain fix is applied.
(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
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
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
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)
■ The spec of color temperature and coordinate.
* Note : x,y coordinates are drifted about 0.007 after 30 mins
heat-run. So checking color coordinate within 5-min at
total assembly line, consider x,y coordinates might be
up to 0.007 than x,y target of each color temperature.
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. Ship-out mode check (In-stop)
▪ After final inspection, press In-Stop key of the Adjustemnt
Remote Control and check that the unit goes to Stand-by mode.
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
8. GND and HI-POT Test
8.1. GND & HI-POT auto-check preparation
(1) Check the POWER CABLE and SIGNAL CABE insertion
condition
8.2. 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.
8.3. 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
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
(85IRE, 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 -
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”.
(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.)
10. Optional adjustments
10.1. 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.
10.2. Manual White balance Adjustment
10.2.1. 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.
10.2.2. 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)
10.2.3. 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
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
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
ADC Comp 1080p
ADC RGB
Start
NG
NG
NG
NG
NG
Reset
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