LG 75SJ857A Service Manual page 57

Standard Repair Process Detail Technical Manual
symptom
Content
① IR & EYE Sensor
IR & LOGO light Rear
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 16 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
③
Established
date
Revised
date
A22
Pin Pin name
1
2
3
4 +3.5V_ST
5
6
7 EYE_SCL
8
9
10
11
12
13
14
15
16 Wakeup Host
②
17 Power on
18
19 +3.5_Wifi
20
21 Combo Reset
22
23
24 +3.5_Wifi
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A22
LED_R
GND
IR
GND
GND
KEY2
EYE_SDA
KEY1
GND
GND
GND
Device
GND
Wifi DP
Wifi DM
GND