LG 43LJ55 -U Series Service Manual page 51

Standard Repair Process Detail Technical Manual
symptom
①
IR & EYE Sensor
IR & LOGO light Rear
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 22 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.
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Only for training and service purposes
Error
D. Function error
Content
Remote control operation checking method
Eye
②
Established
date
Revised
date
A22
A22
P4001
1 +3.4V_WIFI
2 WIFI_DM
3 WIFI_DP
4 GND
5 WOL/WIFI_POWER_ON
6 +3.4V_WIFI
7 NC
8 GND
9 NC
10 NC
11 GND
12 GND
13 NC
14 NC
15 NC
16 I2C_SDA_EYE
17 I2C_SCL_EYE
18 GND
19 IR
20 LED_R
21 GND
③ 22 +3.4V_ST
23 KEY2
24 KEY1
25 GND
LGE Internal Use Only