Sound - LG GX / SPN5-W Service Manual

2. NO SOUND
2-1. BLUETOOTH
2-1-1. Solution
Replace MAIN board.
2-1-2. How to troubleshoot (Countermeasure)
1) Please check status of Bluetooth cable connection. (at CN202 and BT module)
2) Please check 3.3 VA (at pin1, 2 of CN202).
If 3.3 VA is OK, please check USB_DP_P2, BT_RST, BT_WAKEUP, BT_STBY (pin6, 10, 11, 12).
If no signal, please replace MAIN board.
2-1-3. Service hint (Any picture / Remark)
FFC 0.5mm Pitch
Angle,Lock,SMD
ONE POINT REPAIR GUIDE
 
CN202 FB201
TP244
3.3VA
1
3.3VA
2
NC
3
C267 C268
10uF 100nF
GND
4
GND
5
90ohm,150mA, DCR1.4ohm
TP245
1 4
USB_DP
6
TP246
2 3
USB_DN
7
FL205
GND
8
GND
9
TP247
RESET
10
TP248
BT_WAKEUP
11
TP249
GPIO
12
TP250
ZD202
DGND
< MAIN board top view >
3.3VA
ZD203
C269
100nF
R252 4.7
R251 4.7
NC NC NC NC
C273 C274 R253 R254
10pF 10pF 15K 15K
R242 1K
R243 100
R244 100
C270 C271 C272
100nF 100pF 100pF
3-8
Copyright © 2020 LG Electronics Inc. All rights reserved.
Bluetooth
USB_DP_P2
USB_DM_P2
BT_RST
BT_WAKEUP
BT_STBY
 
CN202 CN202
Only for training and service purposes.