User Guide

RH-12/RH-28
Baseband Troubleshooting Instructions CCS Technical Documentation
Page 20 Nokia Corporation Issue 1 02/04
Display Failure
Display fails
Is display working
Yes
Change display
module
NO
End
Yes
Measure Vflash1 @
L302 towards X302
(display connector).
Should be ~2,78Vdc
Measure VIO @ L301
towards X302 (display
connector). Should be
~1,8Vdc
Check:
X302, C311, L302, C310,
D200 (UEME) and PWB
NO
Are LED's working?
Measure Vout on
C304 = ~13,5V
Yes
Check:
N300, C304, R308, R312,
R306, X302, R305, X300, pwb
and UI board
NO
Measure RESX on
X302 - pin 24. Should
be ~1,8V.
Yes
Check:
D400 (TIKU) and pwb
NO
Yes
Phone should work. If
not change engine
board.
Is display
working?
NO
Yes
Yes
Check:
X302, C309, L301, C308,
R307, D200 (UEME) and
PWB
NO