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umm you either fried your battery, the power supply blew, or theres a fuse in it that blew for protection.
first thing i would try is take the battery out and try plugging it directly into the wall, if it turns back on then your battery is shot,if not the power supply within the camcorder blew which could be a small transister or diode and would have to be replaced,or could be a small fuse that went pop within the camera. http://www.sony.co.uk/product/sdh-digital-8/dcr-trv250e/tab/manual here is the manual if you don't already have it. it may tell you if there is a fuse.
either open it up and check the camcorder power supply where you plug in and see if theres any black around anything and if there is then thats what needs to be replaced.or if you dont think you can do that then take it in to the repair shop for servicing.
Before connecting the charger keep these in mind: volts current in amperes, polarity. If anything goes out of range your camera may burn out. Don't try a 'min' or 'max' just use the exact charger ratings. In electronic stores there are these variable adapters available on which the output can be varied. Get one of those, they are cheap and you can use them to charge multiple items.
one of the first things that go are is the protection diode coming off the + input. Then a fuse and so on. Surface mount fuses are light in color (usially green with white text). Attempt to bypass these components with a small wire or paperclip. Once you follow the lead from positive input you will run into a black rectangular block about the size of a grain of rice with 3 leads. That will be your voltage regulator. Its set at the correct voltage, and since you already have a power supply with a set voltage, then you dont need it. Its also the first thing that blows when you switch polaritys. (voltage regulators have 3 pins - input output and ground) when you switch polaritys that ground becomes the "input" and ..... go to all http://www.alldatasheet.com/ and type in the text you see on that component. It will then identify the component and list its voltage output and at which pin. Apply set voltage to lead and ... pray?
best bet to deal with the battery replacement is to download the manual from panasonic and follow their guides, they usually instruct you on how to install the button batt ery at initial start up as this is what holds the date/time in memory when you are charging the main operating battery. go to the following link and enter your specific camcorder info: http://service.us.panasonic.com/operman/
regarding the power supply. You need 6 volt DC. but you need to know the polarity of the line feeding into the camera and match that from your power source, if you have the polarity backwards, you can ruin the camera. You can also cause problems if your external supply has too high of an Amperage rating as an excessive amperage can overheat your camera circuits. verify the amp rating of the camera and verify that the VCR dores not exceed that my more than a few amps.
If you did not damage the dc converter in the camera, you can check several micro fuses located on the regulator board. There are several diodes that assist in blocking reverse polarity applied to the camera. These diodes intentionally open these fuseable devices to protect the power supply and camera.
Hope this helps you,