LG 75SM9900PTA Service Manual page 70

Standard Repair Process Detail Technical Manual
symptom
Content
①
IR & EYE Sensor
IR
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
Eye
Established
date
Revised
date
A14
Pin Pin name
1 LED_R
2
3
4 +3.5V_ST
5
6
7 EYE_SCL
8
9 EYE_SDA
10
11 No Connection
12
13 +3.5V_WiFi
14
15 COMBO_RESET
③
16 BT_WAKEUP
17 WOL/WiFi_POWER_ON
18
19 +3.5V_WiFi
20 WiFi_DP
21 WiFi_SUSPEND/RESUME
22 WiFi_DM
23
24 +3,5V_WiFi
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A14
GND
IR
GND
GND
KEY2
KEY1
GND
GND
GND
GND