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RM-12
SDRAM (1)
All signals in this
troubleshooting are in
Start
range 0 - V18
Run
ST_APE_RAM_
TEST, with
Pass
Phoenix.
Result?
Fail
Measure
SDRAM
Incorrect
voltage V18 at
C5083
Correct
Measure SDCLK
Measure
frequency at
SDCLK
R4808 = 75MHz,
frequency at
Yes
(1.8V).
R4808
>70MHz?, level
0 - ~V18
No
Go to SDRAM
troubleshooting
page 2
Issue 1 11/2004
Use cold spray/
hot air to SDRAM device
or customer feedback
Phone might been
Problem
dropped, solder
occurs only in
Yes
balls cracked,
heat or cold?
replace D5080
No
Go to OMAP1510
troubleshooting
Check and replace
if needed C5083-
Check C5083 - C5089.
C5089, resistance
voltages V18
>>1Mohm
Correct
Phone might been
dropped, solder
balls cracked,
replace D5080
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Measure
SDRAM
Visit APE Power
Incorrect
troubleshooting
at C5083
Correct
voltages V18
Change SDRAM
Nokia Customer Care
Measure
SDRAM
at C5083
Incorrect
D5080
37
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Troubleshooting
