Samsung SGH-P408 Service Manual page 13

3 . S G H - P 4 0 8 Fl o w
1. Power On
' Power O n ' does not work
C heck the current
consum ption
Current consum ption
>=100m A
Check the V bat. Voltage
Voltage >= 3.3V
Check the pin of U100
pin#11 >= 2.8V
pin#39 and pin#42 =
Check the clock signal at pin#3 of
O SC 801
Freq = 13M H z ,
Vrm s ¡Ã300m V
Vpp ¤ó 900m Vpp
Check the initial operation
C h a r t o f T r o u b l e s h o o t i n 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
Charge the Battery
No
Check U100 and C 117
No
No
pin#9 = 1.8V
No C heck the clock generation
circuit
(related to O SC 801)
3- 1
Check U100 and C 116