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Standard Repair Process Detail Technical Manual
symptom
Content
Applied Model
75UN71/72/80/81
EAY65769201 (LGP75T-20U1)
Power Check Sequence
1. AC input Check : SK100 (100~240Vac)
2. PWR-ON Check : P201, 1 pin
- Set On : above 3V
- Set St-by : 0V
3. 13.2V DC Check : P201, 4~8 pin
- Set On : 13.2V
- Set St-by : 7.8V
4. MS Level Check : P201, 11 Pin
MS Level
Range [V]
MS (0V)
0 ~ 0.25
MS (2V)
1.75 ~ 2.25
MS (3V)
2.75 ~ 3.25
※ Home mode : General Customer
Store mode : use Store
5. LED voltage Check : P801, LED B+
Power Board is no problem if all the conditions are satisfied.
Error
B. Power error _No power
Check input/output of power board
Power P/N
LED On/Off
Off
On (Home mode)
On (Store Mode)
Established
date
Revised
date
A18
SK100 (AC input)
Copyright © 2020 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
A18
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