Have trouble getting the tv to turn on. works fine once on

Hello,
Without physically being there it would be hard to tell you exactly what is the cause of the issue, however this sounds more like a issue on the power board then anything else. Bad Capacitors could be a notable issue in these Tv's. Again without looking at the tv and you could upload a picture or a url where the picture is located to like photo bucket or a sky drive of close ups with the back cover off we could get a better feel of where the issue is.
Many of these tv's that have a hard time turning on is the power supply board showing signs of wear and fatigue.
We do hope this information is helpful of some sense to you.
Regards,
Rulds2008

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620