Wont turn on. Jensen TS2750J

HI,

The repair can cost anything between $200-$300.
The first thing you can do is check if the fuse is blown.If it is then replace it.If the fuse is alright then:

ONE: The protection circuit has taken over the power managment of the set. When you unplug it for a couple of hours or so and plug it back in it will start up because the circuits have all been reset (unplugging the power cord is a reset operation.)

TWO: The protection circuit goes into action whenever it detects an excessive amount of current being drawn from one of the 10 sections of the tv circuitry.

THREE: When it won't turn on it is because the protection circuit has captured the ON function and holds the power relay OFF until it is reset.

FOUR: So, the problem area could be any one of the 10 or so sections of the tv. The most common of which is the high voltage section because it uses the greatest amount of power. If so, this could be very expensive.

FIVE: On the other hand, it could be one of the other sections and a small part such as a resistor or capacitor shorting down. In which case the cost of repair may be only a few dollars.

SIX: However, you will need a tv tech to come to the home and diagnose the set because we cannot tell where the failure is without a hands-on diagnosis by one who knows how to test the circuit sections.

SEVEN: Usually a shop will send out a tech who will do a quick check and tell you what is wrong with the set and how much the repair cost is going to be. A house call such as this will cost from $40 to $80 depending on the distance and the price they set. I suggest you call a few shops and get their best response before deciding which one to employ.
Goodluck,
Please don't forget to rate the solution.

For a dead tv with a flashing menu led

Replace diode UD305 with NTE580 to improve reliability,and replace resistor R307, 1 ohm @ 1 watt

hope this fixes it, if not let me know