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1. No Picture (Vga Mode)

Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards

such as electrical shock.

1-1

Safety Precautions

1-1-1

Warnings

1. For continued safety, do not attempt to modify the

circuit board.

2. Disconnect the AC power and DC power jack

before servicing.

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Servicing the LCD Monitor

1. When servicing the LCD Monitor, Disconnect the AC

line cord from the AC outlet.

2. It is essential that service technicians have an

accurate voltage meter available at all times.

Check the calibration of this meter periodically.

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Fire and Shock Hazard

Before returning the monitor to the user, perform

the following safety checks:

1. 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.

2. Inspect all protective devices such as nonmetallic

control knobs, insulating materials, cabinet backs,

adjustment and compartment covers or shields,

isolation resistor- capacitor networks, mechanical

insulators, etc.

3. 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).

Figure 1-1. Leakage Current Test Circuit

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,

screw heads 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.

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Product Safety Notices

Some electrical and mechanical parts have special

safety- related 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.