DOWNLOAD LG 19LN4050 (CHASSIS:LB35A) Service Manual ↓ Size: 4.97 MB | Pages: 28 in PDF or view online for FREE

Model
19LN4050 (CHASSIS:LB35A)
Pages
28
Size
4.97 MB
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PDF
Document
Service Manual
Brand
Device
TV / LCD
File
19ln4050-chassis-lb35a.pdf
Date

LG 19LN4050 (CHASSIS:LB35A) Service Manual ▷ View online

- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range
This specification is applied to the LB35A chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C
(2) Relative Humidity: 65 % ± 10 %
(3) Power Voltage
: Standard input voltage (AC 100-240 V~, 50/60 Hz)
* Standard Voltage of each products is marked by models.
(4)  Specification and performance of each parts are followed 
each  drawing  and  specification  by  part  number  in 
accordance with BOM.
(5)  The receiver must be operated for about 5 minutes prior to 
the adjustment.
3. Test method
1) Performance: LGE TV test method followed 
2) Demanded other specification 
- Safety : CE, IEC specification
- EMC : CE, IEC 
4. Model General Specification
* HDMI 1.4 with Deep Color is only apply for FHD Model
No.
Item
Specification
Remarks
1.
Market
NON EU
2.
Broadcasting system
PAL/SECAM B/G/D/K
PAL-I
NTSC-M
3.
Channel Storage
BAND
PAL(BG,I)
NTSC(M)
China(DK)
VHF/UHF
01-C69
2~78
C1~C69
Cable
S1~S47
1~71
S1~S47
4.
Receiving system
Upper Heterodyne
5.
Video Input
PAL, SECAM, NTSC
Rear(1EA)
6.
USB Input
MP3, JPEG,Movie
Rear(1EA) / Side(1EA)
7.
AV Audio Output 
RF/AV
Rear(1EA)
8.
Audio Input (1EA)
AV
L/R Input(2EA)
9.
Service jack
3.5mm  headphone jack
Rear(1EA)
- 7 -
ADJUSTMENT INSTRUCTION
1. Application Range
This  specification  sheet  is  applied  to  all  of  the  LED TV  with 
LB35A 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. White Balance Adjustment
3.1. Overview
3.1.1. 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
3.1.2. 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.
3.2. 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 Remote control
(4) Video Signal Generator MSPG-925F 720p/204-Gray
     (Model: 217, Pattern: 49) 
* Color Analyzer Matrix should be calibrated using CS-1000.
3.3. Equipment connection
3.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
(2) Adjustment Map
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
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
Warm
R Gain
j
d
00
C0
G Gain
j
e
00
C0
B Gain
j
f
00
C0
R Cut
G Cut
- 8 -
3.5. Adjustment method
3.5.1. 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.
3.5.2. 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
3.6.  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.
4.  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.
5. 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.
6. AUDIO output check
6.1. Audio input condition
(1) RF input: Mono, 1KHz sine wave signal, 100% Modulation
(2) CVBS, Component: 1KHz sine wave signal (0.4Vrms)
6.2. Specification
7. GND and HI-POT Test
7.1. GND & HI-POT auto-check preparation
(1)  Check  the  POWER  CABLE  and  SIGNAL  CABE  insertion 
condition
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.
7.3. 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
(80IRE, 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 (8 Ω Impedance)
- 9 -
8. 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.)
9. Optional adjustments
9.1. Manual White balance Adjustment
9.1.1. 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.
9.1.2. 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 Remot control
(4) Video Signal Generator MSPG-925F 720p/216-Gray 
     (Model: 217, Pattern: 78) 
9.1.3. 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.
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