Need to unplug/ plug i tv for power to come on . TV will not power up when i try. i have to unplug it and plug it back in. then it will power up and hmm loadly for a bit. pic is fine. its a 39 inch lcd
Sounds like you have a problem on your power board. Most likely a components value is changing after it is powered on for a period of time. this is more common for a resister or capacitor. Do you have any power when it will not turn on, A power led blinking etc quick screen flash etc.
Most likely the bad component (s) will continue to deteriorate until it will not turn on at all. Also it is possible operating your tv like could case more extensive damage. Sound like after its is pluged in for a time it faults and prevents itself from turning on this is called protection mode. When you disconnect power you are resting and at he the time it checks itself the voltages are correct. For more detail and possible solutions post your make, model, and any other useful info.
For parts such as a new power board. Check
http://www.RNS-Systems.com
or E-bay
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