LG Electronics 42LT640H-ZA B. Power error, Stand-By Red Operating white, Lcd Tv, Check Power LED

Standard Repair Process

	Error	B. Power error	Established
LCD TV			date
	symptom	No power	Revised date	6/13

☞A17

☞A19

Check

Power LED

. Stand-By: Red

. Operating: white

Power LED Y

On?

N

Check Power cord was inserted properly

DC Power on

by pressing Power Key On Remote control

Normal N operation?

Y

☞A4

Check Power On ‘”High”

Y Replace

OK? Power

B/D

Replace Main B/D

N

Normal?

Y

Measure voltage of each output of Power B/D

※

Close

Check ST-BY 3.5V

☞A18

Y

Normal

voltage?

N

Replace Power B/D

Normal Y voltage?

N

Replace Power B/D

Replace Main B/D

6

Copyright © 2012 LG Electronics. Inc. All rights reserved.	LGE Internal Use Only
Only for training and service purposes