Sound - LG S90QY Service Manual

2. NO SOUND
2-1. BLUETOOTH
2-1-1. Solution
Replace Bluetooth module/ MAIN board.
2-1-2. How to troubleshoot (Countermeasure)
1) Please check status of Wi-Fi / Bluetooth cable connection. (at CN2001 and module)
2) Please check WIFI_3V3 (TP2051 or pin1, 7, 12 of CN2001).
2-a) If Wi-Fi_3V3 is OK, please check USB_DP, USB_DM (TP2046 or pin10, TP2045 or pin11 of CN2001).
2-b) If no signal, please replace MAIN board.
2-1-3. Service hint (Any picture / Remark)
MT8532_USB_DM_P2
MT8532_USB_DP_P2
MT7668_WOWL
MT7668_BT_RST
MT7668_RST_N
MT7668_WOBLE
ONE POINT REPAIR GUIDE
12.06.
Insert C2060,C2061
for EMC
FL2004
4
3
R2028
R2029
2
1
R2020 33
R2021 33
R2022 33
R2023 33
TP2045 TP2045
TP2046 TP2046
< MAIN board bottom view >
10pF NC
C2061
C2060
10pF NC
WIFI_3V3
DGND
TP2051
C2026
TP2045
4.7
4.7 TP2046
TP2047
C2027
TP2048
TP2049
TP2050
C2028
D2001 D2003
DF3D6.8MS DF3D6.8MS
DGND
TP2051 TP2051
3-7
Copyright © 2022 LG Electronics Inc. All rights reserved.
close to connecter
EAG64089812
C2065 22uF
VDD
12
100nF
USB_DN
11
USB_DP
10
GND
9
WOWL
8
VDD
7
100nF
BT_RST
6
GND
5
7668_RST
4
WOBL
3
GND
2
VDD
1
100nF
C2066
CN2001
12507WS-H12G
TP2053
22uF
1.25mm, Straight type
close to connecter
DGND
Only for training and service purposes.