Display And Keypad; Troubleshooting - Nokia 1508 Manual

Baseband description and troubleshooting

Hide thumbs Also See for 1508:

1508(RM-388)

Baseband Description and Troubleshooting

Display and Keypad

The mobile terminal uses light-emitting diodes (LEDs) for liquid crystal display (LCD)

and keypad illumination. There are two white LEDs for the LCD and two LEDs for the

keypad. KEYPAD_LED is the signal used to drive keypad LEDs. LCD_BL_EN is the

signal used to drive LCD LEDs. The mobile terminal uses a color LCD. The interface

uses a parallel bus to transfer the Command/ Data between CBP and LCD.

First, carry out a thorough visual check of the module. Make sure in particular that:

• There is no mechanical damage.

• Soldered joints are OK.

• ASIC orientations are OK.

The following hints should help find the cause of the problem when the circuitry

seems to be faulty. Troubleshooting instructions are divided into the following

sections:

• 'Power Does Not Stay ON'

• "Charger Faults'

• 'Audio Faults'

• 'Display Faults'

• 'Keypad Faults'

• 'No Vibration'

• 'Series/USB Interface Disabled'

• 'UIM Card Unreadable'

Note:

• CBP5.6 is underfilled and can not be replaced.

• The Shielding Case Assy can not be reused after removal.

• After using the heatgun, the domesheet needs to be replaced.

Issue 1

Nokia Customer

Care

Table of Contents

Rm-388