LG 19LD330 / 19LD340 / 19LD345 (CHASSIS:LP91H) Service Manual ▷ View online
- 3 -
SAFETY PRECAUTIONS
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.
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.
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.
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.
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10mm away from PCB.
over 1 W), keep the resistor 10mm 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.
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 MΩ 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.
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 MΩ 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.
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
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
When 25A is impressed between Earth and 2nd Ground
for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard
IMPORTANT SAFETY NOTICE
0.15 uF
Ω
- 4 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
4. Electrical specification
1. Application range
This spec sheet is applied to LCD TV used LP91H chassis.
2. Specification
Each part is tested as below without special appointment.
1) Temperature : 25 ºC ± 5 ºC(77 ºF ± 9 ºF), CST : (40 ± 5) ºC
2) Relative Humidity : 65 % ± 10 %
3) Power Voltage
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.
* 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.
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
2) Demanded other specification
- Safety: CE, IEC specification
- EMC : CE, IEC
- EMC : CE, IEC
No.
Item Specification
Measurement
Remark
1
Screen Size
47 cm(19 inch) wide Color Display Module
Resolution : 1366*768
2
Aspect Ratio
16:9
3
LCD Module
47 cm(19 inch) TFT WXGA LCD
4
Operating Environment
Temp. : 0 deg ~ 40 deg
Humidity : 0 % ~ 85 %
5
Storage Environment
Temp. : -20 ~ 60 deg
Humidity : 0 % ~ 85 %
6
Input Voltage
AC 100-240 V~ 50 / 60 Hz
13.48 W
HD
7
LCD Module
LGD
430.4 x 254.6 x 13
Outline Dimension
0.1*RGB x 0.3
Pixel Pitch
2 CCFLs
Backlight assembly
CMO
413.4 x 234
Outline Dimension
0.3 x 0.3
Pixel Pitch
2 CCFL
Backlight assembly
- 5 -
5. Chroma& Brightness (Optical)
(1) LCD Module
The Color Coordinates check condition
- 50 cm from the surface, Full White Pattern
- Picture mode Vivid
- 50 cm from the surface, Full White Pattern
- Picture mode Vivid
No.
Item
Min.
Typ.
Max.
Unit
Remark
1.
Luminance (W/O PC mode)
200
250
cd/m
2
LGD
185
250
CMO
2.
VIew angle (R/L, U/D)
176 / 170
degree
LGD
170 / 160
CMO
3.
Color Coordinates
White
X
Typ
0.313
Typ
LGD
Y
-0.03
0.329
+0.03
RED
X
0.644
Y
0.335
Green
X 0.304
Y 0.613
Blue
X 0.146
Y
0.071
White
X
Typ 0.313
Typ
CMO
Y
-0.03
0.329
+0.03
RED
X
0.646
Y
0.334
Green
X 0.284
Y 0.602
Blue
X 0.152
Y
0.076
4.
Module Contrast ratio
600
1,000
LGD
700
1,000
CMO
5. Luminance
Variation
1.3
- 6 -
No.
Specification
Proposed
Remarks
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel Clock(MHz)
1 640*
350
31.468
70.09
25.17
EGA
2 720*
400
31.469
70.09
28.32
DOS
3 640*
480
31.469
59.94
25.17
VESA(
VGA)
4 800*
600
37.879
60.317
40
VESA(
SVGA)
5 1024*
768
48.363
60.004
65
VESA(
XGA)
6
1280* 768
47.776
59.87
79.5
VESA( WXGA)
7 1360*
768
47.72
59.799
84.75
VESA(
WXGA)
8
1280* 1024
63.668
59.895
109.00
XGA
Only FHD Model
9
1920* 1080
66.587
59.934
138.50
WUXGA(Reduced Blanking)
Only FHD Model
7. RGB
(Analog PC, RGB-DTV - NOT SUPPORT)
6. Component Video Input (Y, P
B
, P
R
)
No.
Specification
Remarks
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel Clock(MHz)
1
720* 480
15.73
59.94
13.500
SDTV, DVD 480I( 525I)
2
720* 480
15.75
60.00
13.514
SDTV, DVD 480I( 525I)
3
720* 576
15.625
50.00
13.500
SDTV, DVD 576I( 625I) 50 Hz
4
720* 480
31.47
59.94
27.000
SDTV 480P
5
720* 480
31.50
60.00
27.027
SDTV 480P
6
720* 576
31.25
50.00
27.000
SDTV 576P 50 Hz
7
1280* 720
44.96
59.94
74.176
HDTV 720P
8
1280* 720
45.00
60.00
74.250
HDTV 720P
9
1280* 720
37.50
50.00
74.25
HDTV 720P 50 Hz
10
1920* 1080
28.125
50.00
74.250
HDTV 1080I 50 Hz,
11 1920*
1080
33.72
59.94
74.176
HDTV
1080I
12 1920*
1080
33.75
60.00
74.25
HDTV
1080I
13 1920*
1080
56.25
50
148.5
HDTV
1080P
14 1920*
1080
67.432
59.94
148.350
HDTV
1080P
15 1920*
1080
67.5
60.00
148.5
HDTV
1080P