There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
It sure sounds like the tech is too lazy to do some troubleshooting. These two parts are the most common things that go bad. It is easy to collect the money by giving high estimate for repair. It give us the repair guys the bad name.
Please post back what you find.
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