SOURCE: Problem with the Samsung TXN3075WHF
This kind of symptoms is cause by faulty(leaky/dried) electrolytic
capacitor in the power supply section. In the first stage of symptoms
warm up will make itself stable and the unit will power up after a few
attempt of plugging and unplugging from the outlet but it will get
worst, time will come that the unit will not power up at all.
Leaky capacitor has a physical indication of fault like bulged/dome at
the top and can be easily identify like in the sample picture below.
Leaky capacitor with dome at the top.
Dried capacitor has no physical indication of fault, you must have a
capacitor checker to determine its condition, if not available you
should replace all electrolytic capacitor in the power supply section.
It will not cost you much because it is one of the cheapest parts on
that board.
Click this LINK for more information regarding electrolytic capacitor.
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