LG 49SM5KE Service Manual page 18

Standard Repair Process
Error
Monitor Signage
symptom
Check Power LED
Power LED On?
N
Check Power cord
was inserted properly
Normal?
Y
Close
B. Power error
No power
Y
by pressing Power Key
On Remote control
N
Check ST-BY 3.5V at Main B/D
And Power output voltage
(Power output voltage to Main B/D
is 8.8V at ST-BY Status)
☞A10
DC Power on
Normal
operation?
Measure Main Power voltage of each output of Power B/D
(Voltage is different at each status – STBY : 8.8V, Power On : 13.2V
Y
Normal
voltage?
Normal
Y
voltage?
Replace Power B/D
N
Replace Power
B/D
4
Established
date
Revised date
☞A11
N
Check Power
On '"High"
Y
Replace Main B/D
☞A4
Y
Replace Main B/D
N
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4/11
Replace
Y
Power
OK?
B/D