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Flow Chart of Troubleshooting
9-18
VREG_MSME_1.8V
C440
81
4
R
GND
GND
7
1
VIN VOUT1 6
VOUT2
5
U406
EN1
4
EN2
3
2
C436
C441
VDC
KEY_LED_3.3V
LCD_VDD_2.8V
KEY_LED_EN
C172C428
13
4
C
C436
0
4
4
C1
4
4
C
C445
6
44
C
30
5
C
C605
C606
20
3
D
40
4L
L501
PON_RESET_N
R401
R402
1
14
R
2
14
R
R416
R418
1
16
R
0
1
X
C
T
TR401
U402
4
04
U
60
4
U
9-9.
FM RADIO Part
Is there any signal at
L211?
FM Radio does not work
Turn on the Radio.
check the Voltage at
C217 (2.6V) and C220
(2.6V) ?
Check the Earphone and MOD201
Check U400
Check the EAR/SPEAKER Path
.
No
Yes
Yes
Yes
Yes
No
No
Is there any signal at
C336 and C338?
Resolder the MOD201
Check UCP300
No
Replace the UCP300
Yes
Summary of Contents for SGH-G400
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