Display; How The Display Works; Display Troubleshooting - Nokia 2255 Baseband Description And Troubleshooting

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2255 (RM-97)

Baseband Description and Troubleshooting

Display

Nokia 2255 has a color display (128 x 128 64K color depth), controlled by the UPP

through a parallel interface.

UHJ Headset jack/

cover

Volume key

When troubleshooting the display, make these common checks (see

• Check that the display is connected properly and is making good contact with

LCD connector. If no display, replace the LCD.

• Check the power supply VIO and VFlash1. If not correct, check the UEMC.

• Check that the LCD CLk is 2.4MHz

• Check the activity on the LCD test points. If no activity, check or replace D2800

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Figure 15: Nokia 2255 UI Display

Display:

64K color (128x128)

Company Confidential

4-way navigation

key with center-

select

Figure

16):

ISSUE 1 10/2005

Table of Contents

Rm-97