LG 49LJ55 Series - STANDARD REPAIR PROCESS: FUNCTION ERRORS; Remote Control Operation Verification

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.
Standard Repair Process Detail Technical Manual
Remote control operation checking method
D. Function error
A22
Established
date
Revised
date
Error
symptom
Content
A22
②
③
Checking order to check remote control
①
IR & EYE Sensor
IR & LOGO light Rear
IR
Eye
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
22 +3.4V_ST
23 KEY2
24 KEY1
25 GND
LED
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