Samsung SGH-S108 Service Manual page 19

5 . S G H - S 1 0 8 Fl o w
1. Po we r ON
' Power On ' does not wor k
Check the cur rent consumption
Curr ent consumption
>=100mA
Check the V bat. Voltage
Voltage >= 3.3V
Check the pin of U100
pin#15 >= 2.8V
pin#46 and pin#39 =
2.8V
Check the clock signal at pin#4 of
U801
Fr eq = 13MHz ,
Vrms ¡Ã 300mV
and
Vpp ¤ó 900mVpp
Check the initial oper ation
C h a r t o f T r o u b l e s h o o t i n g
Yes
Yes
Yes
Yes
Yes
Yes
END
SAMSUNG Proprietary-Contents may change without notice
No
Download again
No
Charge the Battery
No
Check U100 and C113
No
No
pin#13 = 1.8V
No
Check the clock generation
(related to OSC801 and U801)
5- 1
Check U100 and C112
circuit