How do I find out the weight of my 42LC2DB television for a wall bracket

Tried to find the info for you. suggestion is to make the barcket to hold 50 lbs.

is it a 47 inch LCD Television if so it weighs about 54 pounds with stand.
http://www.usa.philips.com/c-p/47PFL7704D_F7/119cm-47-inch-class-full-hd-1080p-digital-tv/specifications

You need to purchase a wall bracket for your TV. There are several types on the market. Make sure the mountind holes on the TV line up with the wall bracket mounting holes and it can support the weight of your TV.
Google search for a wall mounting bracket for your model TV.

You need to use GOOD WALL BRACKETS which can hold the weight of the TV.
Also the mounting on the wall must be firm with good foundation tower bolts.
please check on the links below for some tips and ideas on wall brackets.:

TV Wall brackets: http://www.regencyproducts.co.uk/
http://www.espares.co.uk/parts/tv-and-audio/lcd/plasma-brackets/p/1459

Yes it will hold,the wall mount u bought it design for weight of 160 LBS and 50"-60" screen sized right?Just make sure hook up the wall mount on and over a wall area with strong woods beams supports have many fours by fours woods beams lumbers to take off the stress of the holding of the tv by those screws alone of the screen frame screws supports only.

I found 2 different sources online that list the weight as either 61.1 lbs or 68.1 lbs. I think the 61.1 is more accurate for the bare TV without the stand or anything attached. But keep in mind that when mounting a flat panel TV to a wall, you should secure it with hardware rated for much higher weight tolerances. Many mounting brackets for TVs of this size are rated for 150 - 200 lbs, and for good reason. Consider a situation where someone trips and catches his balance on the wall-mounted TV. The TV is already putting 61 lbs of pressure on the bracket, so any force from any other contact is added to that. It doesn't take much to add up to 100 lbs or more. If the mount breaks free from the wall, you'll have damage to the TV, the wall, the mount, and any furniture or flooring beneath the TV, so the best advice is to mount it as if it weighed about 150 lbs. The 7 lbs +/- difference in reported weights won't matter at all.

Weight:106.5 lbs according to plasma.com. i did simple websearch (boolian, example Maxent MX-50X5 Television+ weight) and the search came up with that. you may need to convert it to metric if your from outside usa. i would go with a bracket with a higher gross weight, and be sure to mount it where there are wall studs, the bracket will come out if not properly mounted and down will come your tv..

Best of luck

first buy the right bracket for weight of tv there is 4 big black screws near center of tv ( IF FITTED )take them out place bracket over 4 screw holes then use the 4 screws you took out make sure they are tight ( DONT FORGET TO TAKE STAND OFF )