LG 49UF77 Series Service Manual page 105

Standard Repair Process Detail Technical Manual
Error symptom
Content
<LD53H, LD53J>
①
IR & LOGO light front
IR & LOGO light Rear
Eye
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.
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Only for training and service purposes
D. Function error
Remote control operation checking method
IR
②
Established
date
Revised
date
A22
A22
1 GND
2 +3.5V WOL
3 BT_RESET
4 USB_DM
5 NC
6 USB_DP
7 WOL
8 GND
9 SDA
10 GND
11 SCL
12 KEY1
13 GND
14 KEY2
③
15 IR
16 +3.5V_ST
17 LED_R
18 GND
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