LG 86SJ9570 Service Manual page 30

Standard Repair Process
Error
symptom
Check outlet
Check A/C cord
Check for all 3- phase
power out
Fix A/C cord & Outlet
and check each 3
phase out
B. Power error
Off when on, off while viewing, power auto on/off
☞A19
N
Check Power Off
Error?
Mode
Y
CPU
Abnormal
Abnormal
1
☞A18
(If Power Off mode
is not displayed)
Normal
Check Power B/D
voltage?
voltage
※ Caution
Check and fix exterior
Replace Power B/D
of Power B/D Part
8
Established
date
Revised date
Replace Main B/D
Replace Power B/D
Y
Replace Main B/D
N
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8/16
Y
End
Normal?
N