LG 47LA790V Service Manual page 95

Standard Repair Process
Error
LCD TV
symptom
☞A17
Check Power LED
Logo LED On?
N
Check Power cord
was inserted properly
Normal?
Y
Close
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Only for training and service purposes
B. Power error
No power
DC Power on
Y
by pressing Power Key
On Remote control
N
※
Check ST-BY 3.5V
☞A18
Revised date
Normal
operation?
Y
Measure voltage of each output of Power B/D
Y
Normal
voltage?
Normal
Y
voltage?
N
Replace Power B/D
N
Replace Power
B/D
43 / 90
Established
2012. 12 .06
date
☞A19
N
Check Power
OK?
On '"High"
Replace Main B/D
☞A5
Y
Replace Main B/D
Replace
Y
Power
B/D
LGE Internal Use Only