Nokia n80 User Manual

Also see for N 80: User guide User guide Software guide Supplementary guide User guide

Contents

Nokia n80 User Manual Manual pdf 192 page image

Display module troubleshootingGeneral instructions for display troubleshootingThe first step is to verify with a working display that the fault is not on the display module itself. The displaymodule cannot be repaired.The second step is to check that the cellular engine is working normally. This can be done by connecting thephone to a docking station and starting Phoenix service software. With the help of Phoenix read the phoneinformation to check that also application engine is functioning normally (you should be able to read theAPE ID).After these checks proceed to the display troubleshooting flowcharts. Use the Display Test tool in Phoenix tofind the detailed fault mode.Operating modes of the displayDisplay is in a normal mode when the phone is in active use.Display is in a partial idle mode when the phone is in the screen saver mode.Display is in OFF mode when the phone is in the full idle mode (idle LED is flashing).The operating modes of the display can be controlled with the help of Phoenix.Table 8 Display module troubleshooting casesDisplay blank There is no image on the display and Idle LED doesnot flash. Display looks the same when the phone ison as it does when the phone is off. The backlightcan be on in some cases.Image on the display not correct Image on the display can be corrupted or part of theimage can be missing. If part of image is missingchange the display module. If the image isotherwise corrupted, follow the appropriatetroubleshooting diagram.Backlight dim or not working at all Backlight LED components are inside the displaymodule. Backlight failure can also be in theconnector or in the backlight power source in themain engine of the phone. Backlight is alsocontrolled automatically by the ambient lightsensor.This means that in case the display is working(image OK) but the backlight is not, follow theDisplay and keyboard backlight troubleshooting..Visual defects (pixel) Pixel defects can be checked by controlling thedisplay with Phoenix. Use both colours, black andwhite, on a full screen.The display may have some random pixel defectsthat are acceptable for this type of display. Thecriteria when pixel defects are regarded as a displayfailure, resulting in a replacement of the display, arepresented the table below.RM-91; RM-92Nokia Customer Care BB Troubleshooting and Manual Tuning GuidePage 6 –44 COMPANY CONFIDENTIAL Issue 1Copyright © 2006 Nokia. All rights reserved.