Nokia 3600 Slide Service Manual

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Nokia 3600 Slide Service Manual Manual pdf 59 page image

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.This means that in case the display is working(image OK), the backlight is faulty.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 following table.Table 5 Pixel defectsItem White dot defect Black dotdefectTotal1 Defect counts R G B White DotTotal1 11 1 1 12 Combineddefect countsNot allowed.Two single dot defects that are within 5 mm of each other should beinterpreted as combined dot defect.Steps1. Verify with a working display that the fault is not on the display module itself.The display module cannot be repaired.2. Check that the cellular engine is working normally.i To check the functionality, connect the phone to a docking station.ii StartPhoenix service software.iii Read the phone information to check that also the application engine is functioning normally (youshould be able to read the APE ID).3. Proceed to the display troubleshooting flowcharts.Use the Display Test tool inPhoenix to find the detailed fault mode.Display troubleshootingContextThere are three different display fault cases;1 No backlights when image is on2 No image when backlight is on3 No backlight and no imageRM-352; RM-354BB Troubleshooting and Manual Tuning GuideIssue 1 COMPANY CONFIDENTIAL Page 3 –17Copyright © 2008 Nokia. All rights reserved.