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In most cases, you can reset the TV by leaving it unplugged for 30mins.
If this doesn't work, I believe the circuit board that supplies power to the screen maybe bad. They call this board a backlight inverter board. It would most likely cost more to repair than replace the TV .
What I hear you saying is that your main television tuner shows lines only while the PIP is functioning properly. The PIP works by using a separate tuner from the main tuner of your television (like a vcr tuner). Since the PIP works then it appears that your main tv tuner is not working anymore. It will probably have to be replaced. I recommend looking at our online technician list for a professional near you.
On the back of the tv, there is a compartment.( Before loosening the screw, unplug tv and wait 30 min... ) Once you have the door open, loosen 2 more screws and pull the handle, this will pull out the tv's lamp. Check and see if the lamp is blown. Hope this helps