Nokia RM-761 Service Manual page 35

RM-761; RM-799; RM-800
BB Troubleshooting and Manual Tuning Guide
Baseband Troubleshooting
Introduction to BB Troubleshooting
Non re-workable Baseband Components
Baseband main troubleshooting
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Phone does not power on
Power supply troubleshooting
Clocking system troubleshooting
Flash programming
Main memory troubleshooting....................................................................................................................
Charging troubleshooting
Single SIM card troubleshooting..................................................................................................................
Dual SIM troubleshooting (only for RM-761)
USB troubleshooting
User interface troubleshooting.........................................................................................................................
Keyboard troubleshooting
Display troubleshooting
Backlight troubleshooting............................................................................................................................
Camera interface troubleshooting
Camera troubleshooting instructions
No valid data from Camera interface IC
Audio troubleshooting.......................................................................................................................................
Audio troubleshooting test
Internal microphone troubleshooting
Internal earpiece troubleshooting
IHF speaker troubleshooting........................................................................................................................
External microphone
Headset speaker troubleshooting
FM radio troubleshooting..................................................................................................................................
FM radio troubleshooting.............................................................................................................................
Memory card troubleshooting
Cannot detect memory
List of Figures
Figure 2 Baseband test point locations
Listing 1: High current when battery is inserted, I>500mA;
Figure 4 High current when battery
Figure 5 IR picture showing component overheat
Listing 2: High current after pressing power-on key,
Figure 7 High current after pressing power-on key
Figure 8 No current when pressing power on
Figure 9 26 MHz Clock does not
Figure 10 32 KHz RTC clock does not work
Figure 11 Cannot identify charger
Figure 12 No charging current
Figure 13 Cannot identify SIM
Figure 14 SIM voltages, no ATR
Figure 15 SIM voltages, normal startup at 3V
Figure 16 SIM 1 troubleshooting
Issue 1
Table of Contents
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instructions.....................................................................................................
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troubleshooting........................................................................................................
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COMPANY CONFIDENTIAL
Copyright © 2011 Nokia. All rights reserved.
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100mA<I<500mA.........................................................
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key.............................................................................................
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3-5
3-5
3-5
3-5
3-5
3-6
3-6
3-9
3-11
3-12
3-13
3-15
3-17
3-18
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3-21
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3-25
3-25
3-25
3-27
3-28
3-29
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3-32
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