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7 . S G H - E3 5 0 Fl o w
1. Power On
' Power O n ' does not work
C heck the B attery V oltage
is m ore than 3.4V
C 408(V IN T) = 2.7V ?
C heck the C lock at
U 704=32K H Z
C 424(+V D D _IO _L O W ) &
C 423(+V D D _IO _H IG H ) = " H " ?
C 402(+V D D _G SM _C O R E )
= 1.8V ?
C heck for the clock at C 300
= 26M H z
C heck the initial operation
E N D
C h a r t o f Tr o u b le s h o o t in g
Y es
Y es
Y es
Y es
Y es
Y es
Y es
Y es
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N o
C hange the B attery
N o
C heck the PM U related to V IN T
N o
R esolder O SC 400
N o
C heck the related circuit
N o
C heck the +V D D _G SM _C O R E circuit
N o
C heck the clock generation circuit
(related to U 100)
7- 1
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