LG 37LT560H-CA (CHASSIS:LJ2AC) Service Manual ▷ View online
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CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ................................................................................. 3
SPECIFICATION ....................................................................................... 4
ADJUSTMENT INSTRUCTION ................................................................ 7
TROUBLE SHOOTING ............................................................................14
BLOCK DIAGRAM .................................................................................. 20
EXPLODED VIEW .................................................................................. 21
SCHEMATIC CIRCUIT DIAGRAM ..............................................................
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Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An
isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an
AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 M
Ω and 5.2 MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check
(See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS
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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range
This spec sheet is applied all of the 26”, 32”, 37”, 42” LCD TV
with LJ2AB/C/W chassis.
2. Test condition
Each part is tested as below without special notice.
1) Temperature : 25 ºC ± 5 ºC(77 ± 9 ºF), CST : 40 ºC±5 ºC
2) Relative Humidity: 65 % ± 10 %
3) Power Voltage
Standard input voltage (100~240V@ 50/60Hz)
* 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 20 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. General Specification
No
Item
Specification
Measurement
Result
Remark
1.
Receiving System
1) SBTVD / NTSC / PAL-M / PAL-N
2.
Available Channel
1) VHF : 02~13
2) UHF : 14~69
3) CATV : 01~135
3.
Input Voltage
1) AC 100 ~ 240V 50/60Hz
4.
Market
Central and South AMERICA
5.
Screen Size
26 inch Wide (1366 × 768)
26LT360C-SA
32 inch Wide (1366 × 768)
32LT360C-SA
32LT560H-SA
37 inch Wide (1366 × 768)
37LT560H-SA
42 inch Wide (1920 × 1080)
42LT360C-SA
42LT560H-SA
42LT560E-SA
6.
Aspect Ratio
16:9
7.
Tuning System
FS
8.
Module
LC260EXN-SDA1
HD, 60Hz
LGD
26LT360C-SA
LC320EXN-SEA2
HD, 60Hz
LGD
32LT360C-SA
32LT560H-SA
LC420EUE-SEM1
FHD, 60Hz
LGD
42LT360C-SA
42LT560H-SA
42LT560E-SA
LC370EUE-SEM1
FHD, 60Hz
LGD
37LT560H-SA
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5. External Input Support Format
5.1. Component input(Y, CB/PB, CR/PR)
No
Resolution
H-freq(kHz)
V-freq.(kHz)
Pixel clock
Proposed
1.
720*576
15.625
50.000
13.5
SDTV 576I
2.
720*480
15.73
60
13.5135
SDTV ,DVD 480I
3.
720*480
15.73
59.94
13.5
SDTV ,DVD 480I
4.
720*480
31.50
60
27.027
SDTV 480P
5.
720*480
31.47
59.94
27.0
SDTV 480P
6.
720*576
31.250
50.000
27.000
SDTV 576P
7.
1280*720
37.500
50.000
74.25
HDTV 720P
8.
1280*720
45.00
60.00
74.25
HDTV 720P
9.
1280*720
44.96
59.94
74.176
HDTV 720P
10.
1920*1080
28.125
50.00
74.250
HDTV 1080I
11.
1920*1080
33.75
60.00
74.25
HDTV 1080I
12.
1920*1080
33.72
59.94
74.176
HDTV 1080I
13.
1920*1080
56.250
50.00
148.50
HDTV 1080P
14.
1920*1080
67.500
60.00
148.50
HDTV 1080P
15.
1920*1080
67.432
59.939
148.352
HDTV 1080P
16.
1920*1080
27.000
24.000
74.25
HDTV 1080P
17.
1920*1080
26.97
23.976
74.176
HDTV 1080P
18.
1920*1080
33.75
30.000
74.25
HDTV 1080P
19.
1920*1080
33.71
29.97
74.176
HDTV 1080P
5.2. RGB input(PC)
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
PC
DDC
1.
640*350
31.468
70.09
25.17
EGA
X
2.
720*400
31.469
70.08
28.32
DOS
O
3.
640*480
31.469
59.94
25.17
VESA(VGA)
O
4.
800*600
37.879
60.31
40.00
VESA(SVGA)
O
5.
1024*768
48.363
60.00
65.00
VESA(XGA)
O
6.
1152*864
54.348
60.053
80.00
VESA
O
7.
1360*768
47.712
60.015
85.50
VESA (WXGA)
O
8.
1920*1080
67.5
60
148.5
HDTV 1080P
O
※
RGB PC Monitor Range Limits
Min Vertical Freq - 58 Hz
Max Vertical Freq - 62 Hz
Min Horiz. Freq - 30 kHz
Max Horiz. Freq - 83 kHz
Pixel Clock - 160 MHz