LG 75UM7180PVA Service Manual page 69

Standard Repair Process Detail Technical Manual
symptom
Content
SET Model
75UM75 EAY64908601, LGP75T-18U1
Power Check Sequence
1. AC input Check : SK100 (100~240Vac)
2. PWR-ON Check :
- SET On : above 3V
- SET St-by : 0V
3. 13.2V DC Check :
- 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 1-3 / 5-7
Picture Condition : VIVID
(Back light 100)
Voltage Min
183.6
LED 1+
LED 2+ 123.3
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
LED On/Off
Off
On (Home mode)
On (Store Mode)
Max
224.4
150.7
Established
date
Revised
date
LED 1+
P801
SK100 (AC input)
A18
LED 2+
P201
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A18