LG 55QNED85SQA Service Manual page 64

Standard Repair Process Detail Technical Manual
symptom
Content
LED Indicator error condition (UHD Mid/High model only)
1. LED Indicator shows abnormal operation (On and off every 6sec)
2. Abnormal Operation
1) LED B+ Output Voltage Check
2) Local dimming data error
3) No V-Sync
Abnormal
Normal Operation
Driver IC & MCU Communication Check
LED B+ output voltage Check
Open LED Protection
Short LED Protection
-
-
Local dimming data error
V-sync signal error
Error
B. Power error _No power
Error check by LED Indicator
Error signal message
LED blink 0 times
LED blink 1 times
LED blink 2 times
LED blink 4 times
LED blink 5 times
LED blink 6 times
LED blink 7 times
LED blink 8 times
LED Indicator
DRV_IC to MCU communication Error
LED B+ OVP/UVP check
-
Local data error (Checksum & Data Length)
A10
Established
date
Revised
date
< LED Driver BD >
Remark
Normal Operation
-
Short level detect
-
-
No V-sync
A10
Applied
Slim Direct
Slim Direct
Slim Direct
-
Slim Direct
-
-
Slim Direct
Slim Direct