LG LB87 series Service Manual

Checking order
1. Check IR cable condition between IR & Main board
2. Check the st-by 3.5V on the terminal 16.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog
Tester needle moves slowly, and defective when it does not move at all.
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
A27
Established
date
Revised
date
Error
symptom
Content
LCD TV
A27
P4000
1
GND
2
+3.5V_WOL
3
BT_RESET
4
WIFI_DM
5
NC
6
WIFI_DP
7 WIFI_POWER_ON
8 GND
9 EYE_SDA
10 GND
11 EYE_SCL
12 KEY1
13 GND
14 KEY2
15 IR
16 +3.5V_ST
17 LED_R
18 GND
①
②
2014. 01 .20
③
[LD42B models] [LD42A models]
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Only for training and service purposes
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LG LB87 series Specifications

General

Brand	LG
Model	LB87 series
Category	LED TV
Language	English