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Hi There, There are two things that may be wrong: 1 - check your power supply with a multimeter to ensure that it is putting out the proper voltage constantly. AC power supplies generally have a three year life span, shorter with laptops because they get pulled, shoved, twisted, etc. 2 - check that the power input pin on your laptop is in good condition. The board may be broken and you may need to find a new laptop.
The p/n is printed on the battery label. Just search that part on ebay or google, you'll probably get a lot of results. You could also send an email to sharp if you don't have the original battery to obtain the P/N
First thing is to check if the video card is OK.
Connect an external monitor to your laptop, if you get a clear image on this monitor then the video card in the laptop is OK. A faulty backlight could be caused by a defective inverter that supplies high voltage to the CCFL lamp or a faulty CCFL lamp. Most likely a faulty CCFL lamp.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills. Check out www.lcdparts.net for parts, repair service and DIY info.