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SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-
25
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2-1-10. ALERT TONE
C204
R215
R214
C202
C200
C203
C201
R201
R203
C205
VSS
8
VDD
9
V_IN
25
GND
NC
26
27
NC
VDD
3
VOMR
4
VSS
5
VOPR
6
VDD
7
VOPL
18
VDD
19
VSS
2
VSS
20
VDD
21
VIML
22
VREFL
23
VIPL
24
VIMR
10
VREFR
11
VIPR
12
EN_R
13
VSS
14
VDD
15
VOML
16
VSS
17
C206
U104
EN_L
1
SPK_R-
SPK_R+
SPK_L+
SPK_L-
CODEC_OUT_R
CODEC_AGND_L
CODEC_OUT_L
CODEC_AGND_R
SOUND_EN
Alert tone-On in "Profile" Menu and
then Check the Volume-Bar
Resoder or Change the
Speaker(s)
NO
Replace U104
YES
YES
NO
Abnormal Alert tone
Check the Solder-Status
of 2 Speaker. wrong
solder?
Play a MP3(Ring
Tone) and then
Check the #A1/A3
of U104
Alert is not ok?
*Reference the "2-1-8"
YES
END