LG 55UM7450PVA Service Manual page 71

Standard Repair Process Detail Technical Manual
symptom
Content
①
IR & EYE Sensor
Checking order to check remote control
Checking order
1. Check IR cable condition between IR & Main board.( Check picture number① and ②)
2. Check the standby 3.5V on the terminal 6 pin. (③)
3. AS checking the Pre-Amp(IR LED light), the power is in ON condition, an Analog Tester
needle should move slowly, otherwise, it's defective.
Error
D. Function error
Remote control operation checking method
Established
date
Revised
date
②
A22
Pin Pin name
1
2 USB_DM
3 USB_DP
4
5 WOL/WIFI_ON
6
7 WIFI_Suspend/Resume
8
9 Combo_Reset
10 BT_WAKEUP_HOST
11
12
13
14
15
③
16 EYE_SDA
17 EYE_SCL
18
19
20 LED_R
21
22
23
24
25
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A22
VCC
GND
VCC
GND
GND
VCC
GND
IR
GND
VCC
KEY2
KEY1
GND