1-1
1. Precautions
1. Precautions
1-1. Safety Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as
electrical shock.
1-1-1. Warnings
For continued safety, do not attempt to modify the circuit board.
Disconnect the AC power and DC power jack before servicing.
1-1-2. Servicing the LCD Monitor
When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.
It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of
this meter periodically.
1-1-3. Fire and Shock Hazard
Before returning the monitor to the user, perform the following safety checks:
Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the
chassis and other metal parts in the monitor.
Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and
compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.
Leakage Current Hot Check (Figure 1-1):
WARNING
: Do not use an isolation transformer during this test.
Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI
C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).
With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch
first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit,
etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts.
The current measured should not exceed 0.5 milliamp.
Reverse the power-plug prongs in the AC outlet and repeat the test.
1-1-4. Product Safety Notices
Some electrical and mechanical parts have special safetyrelated characteristics which are often not evident from visual
inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage,
wattage, etc. Parts that have special safety characteristics are identified by
on schematics and parts lists. A substitute
replacement that does not have the same safety characteristics as the recommended replacement part might create
shock, fire and/or other hazards. Product safety is under review continuously and new instructions are issued whenever
appropriate.
1.
2.
1.
2.
1.
2.
3.
4.
DEVICE
UNDER
TEST
(READING SHOULD)
NOT BE ABOVE 0.5mA
LEAKAGE
CURRENT
TESTER
TEST ALL
EXPOSED METAL
SURFACES
2-WIRE CORD
*ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
EARTH
GROUND
Figure 1-1. Leakage Current Test Circuit
Summary of Contents for LTW19HS
Page 9: ...3 6 3 Disassembly and Assembly Memo...
Page 24: ...1 4 1 Precautions Memo...
Page 28: ...2 4 2 Product specifications Memo...
Page 31: ...4 3 4 Troubleshooting 4 2 1 Circuit diagrams when the power does not turn on...
Page 33: ...4 5 4 Troubleshooting 4 3 1 When a blank screen is displayed Analog...
Page 34: ...4 6 4 Troubleshooting 4 3 2 Waveforms when no screen is displayed Analog...
Page 36: ...4 8 4 Troubleshooting 4 4 1 Circuit diagrams when a blank screen is displayed Digital...
Page 37: ...4 9 4 Troubleshooting 4 4 2 Waveforms when a blank screen is displayed Digital...
Page 50: ...6 4 6 Wiring Diagram Memo...
Page 53: ...7 3 7 Schematic Diagram 7 4 Schematic Diagrams IP Board SMPS Part...
Page 54: ...7 4 7 Schematic Diagram Inverter Part...
Page 56: ...7 6 7 Schematic Diagrams Memo...
