LG 43LJ55 -U Series Service Manual page 52

Standard Repair Process Detail Technical Manual
symptom
WiFi AC only Model
① Wifi Assy Front
② Wifi Assy Rear
Checking order to check WiFi
Checking order
1.Check IR/Wifi cable condition between Wifi assy & Main board.
2.Check the 3.5V on the terminal
Copyright 2017 LG Electronics Inc. All rights reserved.
Only for training and service purposes
Error
D. Function error
Content
Wifi operation checking method
②
A23
Established
date
Revised
date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
③
18
19
20
21
22
23
24
25
A23
P4001
+3.4V_WIFI
WIFI_DM
WIFI_DP
GND
WOL/WIFI_POWER_ON
+3.4V_WIFI
NC
GND
NC
NC
GND
GND
NC
NC
NC
I2C_SDA_EYE
I2C_SCL_EYE
GND
IR
LED_R
GND
+3.4V_ST
KEY2
KEY1
GND
LGE Internal Use Only