Figure 23 Blank display troubleshooting flow
Display is corrupt
The display contains missing or fading segments or color presentation is incorrect. Since ACF assembling is
used, it cannot be repaired.
Backlight troubleshooting
No backlight
The backlight is driven by a DC-DC converter. The LCD backlight LED’s and the keypad LED’s are in connected
in serial path. If any component on this serial path is open circuit, there is no backlight.
RM-704
BB Troubleshooting and Manual Tuning Guide
Page 3 – 22 COMPANY CONFIDENTIAL Issue 1
Copyright © 2011 Nokia. All rights reserved.
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