Samsung SGH-X480 Service Manual page 25

7 . Fl o w C h a r t o f T r o u b l e s h o o t i n g
1. Power On
The set is not ' Power O n '
C heck the current consum ption
C urrent consum ption
>=100m A
C heck the +V BA TT V oltage
V oltage >= 3.3V
C heck the pin of U 100
pin#J 12 of U 100 >= 2.8V
pin#A 13 of U 100 = 2.8V
C heck the clock signal
at pin#3 of U 802
Freq = 26M H z ,
V rm s ¡Ã300m V
C heck the initial operation
Y es
Y es
Y es
Y es
Y es
Y es
E N D
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N o
D ownload again
N o
C harge the Battery
N o
C heck U 100 and C 115
N o
N o
pin#G 11 = 1.8V
N o
C heck the clock generation circuit
(related to U 802)
7- 1
C heck U 100 and C 116