Troubleshooting

Troubleshooting

Service personnel concerned with troubleshooting should review the following topics in this manual:

Error Codes (see “Error Codes” on 6-3)

Boot Sequence (see “Performance Assurance Test” on 4-11)

Performance Verification (see “Performance Procedures” on 4-22)

This is intended to be a practical, hands-on part of the training program. If possible, therefore, use a monitor to help you learn about troubleshooting the monitor.

When faced with a call regarding the monitor, there are some simple steps that are recommended to solve the failures described below. These failures account for the majority of known failure modes.

Symptom

Cause of Failure

Remedy

 

 

 

Monitor screen appears dim

Brightness not properly adjusted.

Adjust brightness using Contrast button.

 

Display backlight tube worn.

Replace backlight tube according to

 

 

instructions in “Replacing the Backlight

 

 

Tube” on page 9.

 

 

 

 

Monitor screen is blank

Display backlight tube worn or

1.

Check the backlight tube connector

 

loose connection.

2.

Replace the backlight tube

 

Main PCB module malfunction.

Replace the Main PCB module according

 

to instructions in “Removing the Main

 

 

 

 

PCB Module” on 7-12.

 

 

 

Monitor fails to power-up

Battery is dead or monitor is not

Make sure the monitor is powered on by

when the On/Standby

plugged in.

either battery or AC power. Check that the

button is pressed.

 

battery is adequately charged and AC

 

 

power fuses are securely connected.

 

Keypad malfunction or keypad

1.

Check the keypad connector.

 

connector is loose.

2.

Replace the keypad according to the

 

 

 

instructions in “Removing the

 

 

 

Keypad on the Front Panel” on

 

 

 

7-6.

No response when pressing

Keypad malfunction or keypad

1.

If only one button does not work,

the buttons on the front panel

connector is loose.

 

verify that the monitor is On.

 

 

2.

Check the keypad connector

 

 

3.

Replace the keypad according to the

 

 

 

instructions in “Removing the

 

 

 

Keypad on the Front Panel” on

 

 

 

7-6.

Training 11-11

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Philips 862474, 862478 manual Troubleshooting, Symptom Cause of Failure Remedy

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