Psu Failure Check - Insignia NS-LCD40HD-09 Service Manual

First check cables which connect with PSU then check as follows
1) Check input voltage as NO picture
2) Check speaker output
First, check speaker anode (+) and cathode (-),confirm speaker short or not. If short , replace speaker.
Second, check CN2, CN3 with oscillograph, confirm wave output or not.
Connector: CN2, CN3

10.2 PSU failure check

State: No power
First, check cables which connect with PSU, then check as follows
1) Check PSU input voltage AC input
voltage : 120V
connector:CON1 P1,P5
2 Check PSU output voltage orderly
voltage :+5V(Stand-By) ON 5.0V +24V ,+12V
connector:CON4 3 CON4 1 CON4 6,7 ,CON2 1-4
State No sound
10.3 Panel failure
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