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4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics
78/136
LGE Property
4.8 Vibrator trouble
Check Points
-Vibrator soldering
-IC is working correct
Check
PWM Signal
TP1
TP2
TP3
TP4
C330
C331
TP3
TP4
TP1
TP2
R311
GS290 Operational Description Revision B
LG Electronics
78/136
LGE Property
4.8 Vibrator trouble
Check Points
-Vibrator soldering
-IC is working correct
Check
PWM Signal
TP1
TP2
TP3
TP4
C330
C331
TP3
TP4
TP1
TP2
R311
TPA6202A1ZQVR
U303
B2
C1
A1
B1
B3
C2
A3
C3
IN-
VDD
IN+
VO+
_SHUTDOWN
VO-
BYPASS
GND
100K
R318
100K
R310
52
3
R
K1
BU31TD2WNVX
U302
5
3
2
4
1
VOUT
VIN
GND
STBY
D
N
G
P
10n
C316
51K
R311
100n
L301
41
3
R
K1
51K
R315
Q300
KRC402E
2
1
C
B
E
GND
IN
OUT
1u
C325
C330
1u
C331
1u
L307
100n
K1.
5
12
3
R
C355
10n
VBAT
VB301
2
1
VIB_PWM
VIB_EN
Vibrator
TP1
TP2
TP
TP4