LG 55LM4600 (CHASSIS:LT21B) Service Manual ▷ View online
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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 LCD TV with LT21B/C Chassis
2. Test condition
Each part is tested as below without special notice.
1) Temperature : 25 ºC ± 5 ºC (77 ºF ± 9 ºF), CST : 40 ºC±5 ºC
2) Relative Humidity: 65 % ± 10 %
3) Power Voltage
- Taiwan : 110V 60Hz
- Colombia : 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 5 minutes prior to
the adjustment.
3. Test method
1) Performance: LGE TV test method followed
2) Demanded other specification
- Safety : UL, CSA, IEC specification
- EMC: FCC, ICES, IEC specification
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4. General Specification
No
Item
Specification
Remark
1.
Screen Size
31.55 inch
LC320EUN-SEM2
31.50 inch
T320HVN01.0(60Hz/FHD/AUO)
31.51 inch
LC320DXN-SER2(60Hz/HD)
31.55 inch
LC320WUN-SCA2(60Hz/FHD/EEFL)
31.51 inch
LC320EXN-SEA2(60Hz/HD)
31.50 inch
T320XVN01.1(60Hz/HD/AUO)
31.51 inch
LC320WXN-SCA2(10 years module)
31.51 inch
LC320DXN-SEU2(60Hz/FHD)
31.55inch
LC320EUN-SEF2(T120)
42.02 inch
LC420DUN_SEU2(60Hz/FHD)
42.92 inch
LC420EUE-SEF1(T120)
46.96 inch
LC470EUE-SEF1(T120)
42.02 inch
LC420WUE-SCA2(60Hz/FHD/EEFL)
42.02 inch
T420HVN02.1(60Hz/FHD/EEFL/AUO)
54.64 inch
LC550EUE-SEF1(T120)
46.96 inch
LC470EUE-SEM1(60Hz/FHD)
42.02 inch
LC420EUE-SEM1(60Hz/FHD)
42.02 inch
LC420DUN_SER2(60Hz/FHD)
42.00 inch
T420HVN01.1(60Hz/FHD/AUO)
2.
Aspect Ratio
16:9
All
3.
LCD Module
31.55” Color WUXGA TFT-LCD Module
LC320EUN-SEM2
31.50” Color WUXGA TFT-LCD Module
T320HVN01.0(60Hz/FHD/AUO)
31.55” Color WUXGA TFT-LCD Module
LC320WUN-SCA2(60Hz/FHD/EEFL)
31.51” Color WXGA TFT-LCD Module
LC320EXN-SEA2(60Hz/HD)
31.51” Color WXGA TFT-LCD Module
LC320DXN-SER2(60Hz/HD)
31.51” Color WUXGA TFT-LCD Module
LC320DXN-SEU2(60Hz/FHD)
31.50” Color WXGA TFT-LCD Module
T320XVN01.1(60Hz/HD/AUO)
31.55” Color WXGA TFT-LCD Module
LC320WXN-SCA2(10 years module)
31.55” Color WUXGA TFT-LCD Module
LC320EUN-SEF2(T120)
42.02” Color WUXGA TFT-LCD Module
LC420DUN_SEU2(60Hz/FHD)
46.96” Color WUXGA TFT-LCD Module
LC470EUE-SEF1(T120)
42.02” Color WUXGA TFT-LCD Module
LC420EUE-SEF1(T120)
54.64” Color WUXGA TFT-LCD Module
LC550EUE-SEF1(T120)
46.96” Color WUXGA TFT-LCD Module
LC470EUE-SEM1(60Hz/FHD)
42.02” Color WUXGA TFT-LCD Module
LC420DUN_SER2(60Hz/FHD)
42.02” Color WUXGA TFT-LCD Module
LC420EUE-SEM1(60Hz/FHD)
42.00” Color WUXGA TFT-LCD Module
T420HVN01.1(60Hz/FHD/AUO)
42.02” Color WUXGA TFT-LCD Module
LC420WUE-SCA2(60Hz/FHD/EEFL)
42.02” Color WUXGA TFT-LCD Module
T420HVN02.1(60Hz/FHD/EEFL/AUO)
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4.
Operating Environment
1) Temp. : 0 ~ 50 deg
All
2) Humidity : 10 ~ 90%
5.
Storage Environment
1) Temp. : -20 ~ 60 deg
All
2) Humidity : 10 ~ 90%
6.
Input Voltage
AC100 ~ 240V, 50/60Hz
All
7.
Power Consumption
59W
31.55”
FHD(LED)
LC320EUN-SEM2
87W
31.51”
HD(EEFL)
LC320WXN-SCA2(10 years module)
31.55”
FHD(LED-T120-FPR)
LC320EUN-SEF2(T120)
46.96”
FHD(LED-T120-FPR)
LC470EUE-SEF1(T120)
42.02”
FHD(LED-T120-FPR)
LC420EUE-SEF1(T120)
54.64”
FHD(LED-T120-FPR)
LC550EUE-SEF1(T120)
46.96”
FHD(LED 60Hz)
LC470EUE-SEM1(60Hz/FHD)
31.55”
FHD(EEFL)
LC320WUN-SCA2(60Hz/FHD/EEFL)
42.02”
FHD(LED 60Hz)
LC420DUN_SEU2(60Hz/FHD)
42.02”
FHD(LED 60Hz)
LC420EUE-SEM1(60Hz/FHD)
42.00”
FHD(LED 60Hz)
T420HVN01.1(60Hz/FHD/AUO)
31.50”
FHD(LED 60Hz)
T320HVN01.0(60Hz/FHD/AUO)
43W
31.50”
HD(LED 60Hz)
T320XVN01.1(60Hz/HD/AUO)
31.50”
HD(LED 60Hz)
LC320EXN-SEA2(60Hz/HD)
42.02”
FHD(LED 60Hz)
LC420DUN_SER2(60Hz/FHD)
31.51”
FHD(LED 60Hz)
LC320DXN-SEU2(60Hz/FHD)
31.51”
HD(LED 60Hz)
LC320DXN-SER2(60Hz/HD)
42.02”
FHD(EEFL 60Hz)
LC420WUE-SCA2(60Hz/FHD/EEFL)
42.02”
FHD(EEFL 60Hz)
T420HVN02.1(60Hz/FHD/EEFL/AUO)
8.
LCD Module
Maker
Inch
(H) × (V) × (D)
(Outline Demension)
LGD
31.55
727.4 X 429.0 X 22.7
LC320EUN-SEM2
LGD
31.51
760.0 X 450.0 X 43.0
LC320WXN-SCA2(10 years module)
LGD
31.55
727.4 X 429.0 X 22.7
LC320EUN-SEF2(T120)
LGD
42.02
960.4 X 560.4 X 17.4
LC420EUE-SEF1(T120)
LGD
31.51
760.0 X 450.0 X 32.5
LC320DXN-SER2(60Hz/HD)
LGD
46.96
1070.6 X 622.0 X 22.0
LC470EUE-SEF1(T120)
LGD
54.64
1244.6 X 720.9 X 22.0
LC550EUE-SEF1(T120)
LGD
46.96
1070.6 X 622.0 X 22.0
LC470EUE-SEM1(60Hz/FHD)
LGD
42.02
960.4 X 560.4 X 17.4
LC420EUE-SEM1(60Hz/FHD)
AUO
42.00
930.24 X 523.26
T420HVN01.1(60Hz/FHD/AUO)
AUO
31.50
727.4 X 429 X 20
T320HVN01.0(60Hz/FHD/AUO)
AUO
31.50
735.4 X 433.8 X 10.8
T320XVN01.1(60Hz/HD/AUO)
LGD
31.51
735.4 X 433.0 X 10.8
LC320EXN-SEA2(60Hz/HD)
LGD
42.02
983.0 X 576.0 X 35.5
LC420DUN_SEU2(60Hz/FHD)
LGD
31.51
760.0 X 450.0 X 32.5
LC320DXN-SEU2(60Hz/FHD)
LGD
42.02
983.0 X 576.0 X 35.5
LC420DUN_SER2(60Hz/FHD)
LGD
42.02
983.0 X 576.0 X 46.0
LC420WUE-SCA2(60Hz/FHD/EEFL)
LGD
31.55
760.0 X 450.0 X 48.0
LC320WUN-SCA2(60Hz/FHD/EEFL)
AUO
42.02
983.0 X 576.0 X 52.65
T420HVN02.1(60Hz/FHD/EEFL/AUO)