LG SPM2 - Handling the Product; Shipping, Cleaning, and Surface Care

3-9
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Only for training and service purposes.
< MAIN board top view >
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JK102
JK102
ONE POINT REPAIR GUIDE
NO SOUND
2-3. USB
2-3-1. Solution
Replace MAIN board.
2-3-2. How to troubleshoot (Countermeasure)
1) Please check soldering status of USB_5 V at JK102 pin1.
2) If soldering status and USB_5 V are abnormal, replace MAIN board.
2-3-3. Service hint (Any picture / Remark)
USB2.0
USB CURRENT LIMIT 500mA
USB-IF
Firm ware Upgrade
Play music via USB
FROM/TO MCL3730SD - USB
Route D+ and D- as 90 ohm differential pair.
C236
10V/0.1uF
C235
50V/0.01uF
C239
OPEN
1
2
34
JK102
USB-A-001
D105
AR0521P1
C248
50V/0.01uF
C246
16V/1uF
C247
10V/0.1uF
R304
100K
R306
100
C244
50V/0.01uF
C249
10V/10uF
C242
10V/10uF
C243
16V/1uF
C245
10V/0.1uF
R305
1k
15
4
2
OUT IN
FLT
GND
EN/EN
3
IC107
R307
OPEN
T127
C237
10V/10uF
C101
10V/10uF
C108
50V/0.01uF
R212
0
12
34
L125
180R/330mA
L115
220ohm/2200mA
L131
1K/500mA
L121
220ohm/2200mA
L120
220ohm/2200mA
USB_OTG_VBUS
USB_DN
USB_DP
DGND
STBY_5V
USB_OCP_DET
USB_VBUS_SW
DGND
DGND
DGND
DGND
USB_VBUS
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