LG 75NANO90UNA Service Manual page 72

Standard Repair Process Detail Technical Manual
symptom
Content
①
IR & EYE Sensor
IR Eye
LED
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 (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
②
Established
date
Revised
date
A14
Pin Pin name
1 +3.5V_WIFI
2 WIFI_DM
3 WIFI_DP
4 GND
5 WOL/WIFI_PWR_ON
6 +3.5V_WIFI
7 RESET
8 GND
9 COMBO_RESET_JACK
10 BT_WAKE_UP_HOST
11 GND
12 +3.5V_WIFI
13 No Connection
14 No Connection
15 No Connection
③
16 EYE_SDA
17 EYE_SCL
18 GND
19
20 LED_R
21 GND
22 +3.5V_ST
23 KEY2
24 MIC_DATA
25 MIC_CLK
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A14
IR