Samsung SGH-P400 Service Manual page 12

3 . S G H - P 4 0 0 Fl o w
1. Power On
' Power O n ' does not work
C heck the current
consumption
C urrent consumption
>=100mA
C heck the V bat. Voltage
Voltage >= 3.3V
C heck the pin of U100
pin#11 >= 2.8V
pin#39 and pin#42 =
C heck the clock signal at pin#3 of
O SC801
Freq = 13M H z ,
Vrms ¡Ã300mV
Vpp = 900mVpp
C heck the initial operation
C h a r t o f T r o u b l e s h o o t in g
Y es
Y es
Y es
2.8V
Y es
Y es
and
Y es
END
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No
Download again
No
C harge the Battery
No
C heck U100 and C 117
No
No
pin#9 = 1.8V
No C heck the clock generation
circuit
(related to O SC 801)
3- 1
C heck U100 and C 116