LG 32LD330 / 32LD330C / 32LD331C / 32LD340 / 32LD341C / 32LD342C / 32LD345 (CHASSIS:LP91H) Service Manual ▷ View online
LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LP91H
MODEL: 32LD330/330C
32LD330/330C-TA
MODEL:
32LD331C/340
32LD331C/340-TA
MODEL:
32LD341C/342C
32LD341C/342C-TA
MODEL:
32LD345
32LD345-TB
P/NO : MFL62461509 (1101-REV02)
- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
SPECIFICATION ....................................................................................... 3
ADJUSTMENT INSTRUCTION ................................................................ 8
TROUBLE SHOOTING ........................................................................... 13
BLOCK DIAGRAM.................................................................................. 16
EXPLODED VIEW .................................................................................. 17
SVC. SHEET ...............................................................................................
- 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 1W), keep the resistor 10mm away from PCB.
over 1W), 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 1MΩ and 5.2MΩ.
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 1MΩ and 5.2MΩ.
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 1.5K/10watt resistor in parallel with a 0.15uF 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
0.5mA.
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 1.5K/10watt resistor in parallel with a 0.15uF 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
0.5mA.
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
0.15uF
Ω
- 4 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
4. Module specification(General)
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(100 V - 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
32” wide Color Display Module
Resolution : 1366*768
2
Aspect Ratio
16:9
3
LCD Module
32” TFT WXGA LCD
4
Operating Environment
Temp.: (0 ~ 40) deg
Humidity : 0 % ~ 85 %
5
Storage Environment
Temp.: (-20 ~ 60) deg
Humidity : 0 % ~ 85 %
6
Input Voltage
AC 100 V - 240 V~, 50/60 Hz
87.5 W
HD
7
LCD Module
AUO
760 x 450 x 46.9
Outline Dimension
0.51075 x 0.51075
Pixel Pitch
4 CCFLs
Backlight assembly
SHARP
760 x 450 x 50
Outline Dimension
0.51075 x 0.51075
Pixel Pitch
8 CCFT
Backlight assembly
IPS
697.685 x 392.256
Outline Dimension
0.51075 x 0.51075
Pixel Pitch
4 CCFL
Backlight assembly
