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Flow Chart of Troubleshooting and Circuit Diagram
5-4 SGH-A300 Charging Part
Abnormal charging part
Check
the pin 17, 18 of CN603-1
is around 5V
Check the pin 2 of U8021
is "Low"
Check the
pin 5, 6 of U8021 is more
than 0.5V
Check the
Voltage of pin 5 of
U605 is between 3.2 V
and 4.2 V
END
Ta_Det
3
Q605
1
L602
Vext
Y
Y
Y
Y
Y
2
TA_PRES
U605
R646
ISENSE
1
22K
2
GND
3
VCC
C635
10UF
10V
Charger_Disable
SAMSUNG Proprietary-Contents may change without notice
N
Check the U201
N
using Factory Test Program
N
Resolder R648, R651, R646
N
Q601
1
6
R634
DRIVE
0
5
VSENSE
4
PROG
U8021
R637
1
3.3K,1%
2
3
5-4
Replace TA
Change U605
Vbat
3
2
C634
10UF
10V
6
R651
0
5
R648
10K
4
TA_PRES
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