DOWNLOAD LG 26LN41XX / 26LN4100 / 26LN4110 / 26LN4130 / 26LN4140 (CHASSIS:LM91M) Service Manual ↓ Size: 5.97 MB | Pages: 33 in PDF or view online for FREE

Model
26LN41XX 26LN4100 26LN4110 26LN4130 26LN4140 (CHASSIS:LM91M)
Pages
33
Size
5.97 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
26ln41xx-26ln4100-26ln4110-26ln4130-26ln4140-chass.pdf
Date

LG 26LN41XX / 26LN4100 / 26LN4110 / 26LN4130 / 26LN4140 (CHASSIS:LM91M) Service Manual ▷ View online

- 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
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
ADC Calibration
ADC Comp 480i
ADC Comp 1080p
ADC RGB
Start
NG
NG
NG
Reset
- 13 -
TROUBLE SHOOTING
1. NO POWER-Main PCBA
Is Adapter 
Output VOLTAGE  19.4V
through of JK700?
NO POWER
Is 3.3V at C708?
Check waveform of X501 
YES
NO
YES
NO
YES
check open or short at Line.
or change Adapter.
check the Lines of IC701,
If there is any problem at Line, 
Change IC701
NO
Check Line short or open between 
IC501 and X501,
Change IC501  or change X501
1
2
4
Is 1.8V at C745?
is 1.25V  at C742?
3
YES
check the Lines of IC711,IC704
If there is any problem at Line, 
Change IC704,IC706.
NO
Insert F/W
is 3.3V at 1pin of P120?
when push power key,
Is 0v at 2pin of P120?
Change control
Or check Line short or open of P120
5
is there any waver at 11pin of P120,
when use remote controller? 
6
NO
YES
change IR board
Or check Line short or open of P120
NO
4
X501
- 14 -
2. No raster (Power LED blue, black screen)
Is 19.4V  at JK700?
NO RASTER
(Screen is not displayed)
Insert the F/W back
or REPLACE LCD MODULE
Is 1.8V at L501?
Is 1.25V  at L500?
Is 1.25V  at 4pin of IC704?
Is 1.8V at 2pin of IC711?
YES
NO
YES
NO
YES
Check Line short or open between
IC711/IC704  and IC501,
If there is any problem at Line, 
Change IC711/IC704  or change IC501
NO
check open or short at Line and wafer
between IC704,IC711  and IC600.
If there is any problem at Line, 
Change IC704,IC711  or IC501
1
2
is 3V at 3pin of IC801?
YES
It is not over 3V at 1pin of IC801.
Change Q802.
Or check Line short or open between
R803 and 95pin of IC501.
Change IC 501.
4
3
NO
check open or short at Line.
or change Adapter
is 12V at 1pin of P101?
If is not under 1.5V at R722, 
change Q721 or check open and short 
of Line among Q720 and Q721.
If is under 11V at L110,
Check open and short 
Of line between L110 and P101.
6
NO
Put into LVDS cable completely?
LVDS cable have damage?
NO
If LVDS cable isn’t insulted enough, 
Insult LVDS cable until locking hook.
If LVDS cable have damage,
Change LVDS cable
5
YES
YES
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