[TV] Insigna INP4219 plasma does not power on

[Gaëtan B <techno57@xxxxxxxxxxx>]

Got this Insigna plasma INP4219 that when powering on makes a little thump in the speakers then shuts down.
 
Check all fuses ok , no component burnt , checked many transistors in power supply ok.
Don't really know where to start or look at in this one.
 
Any hints welcome,
TIA
              GaëtanATV (aka: Techno Logik)Terrebonne , Que. 
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