LG 55UM7450PVA Service Manual page 67

Standard Repair Process Detail Technical Manual
symptom
Content
SET Model
55UM73/74/75/76 EAY65149301, LGP55T-19U1
Power Check Sequence
1. AC input Check : SK100 (100~240Vac)
2. PWR-ON Check : Check Hole
- SET On : above 3V
- SET St-by : 0V
3. 13.2V DC Check : D201 center Pin
- SET On : 13.2V
- SET St-by : 7.8V
4. MS Level Check : MS
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, Pin 1-7
Picture Condition : VIVID (Back light 100)
Min
175.5V
all condition meets, Power Board OK.
Error
B. Power error _No power
Check power input voltage and ST-BY 7.8V
Power P/N, Name
Power Board Voltage / Current
LED On/Off
Off
On (Home mode)
On (Store Mode)
Max
214.5V
Established
date
Revised
date
P801
SK100 (AC input)
A18
MS
PWR-ON
D201 (13.2V)
Copyright © 2019 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
A18
P201