If your display image is messed up you can transfer the LCD panel to your system following this guide MacBook Pro 13" Unibody Mid 2009 LCD Replacement
If your issue is the backlight then that’s going to take a bit more as thats likely a problem within your logic board.
I’m suspecting your LVDS connector on the logic board is the failure here. Lets review the schematic
And here is the returns on the connector
Here’s the power source these two pins which are wired together
Here’s a more detailed view of the connector
So as you’ve lost half of your LED backlight strip which sits at the bottom of the screen the question you need to test things using a Ohm/Continuity meter is if circuit is viable for each return. I would use a spare LVDS cable to plug in so I can then check each path. In most cases I don’t need to do this as corrosion on the logic board connector often is a tell-tale sign the connector is bad.
Likewise, after unplugging the LVDS cable I can also check the LED string/cable connection as the display its self has a connector for the cable that can also get damaged and the cable could be bad as well. You should see a resistance on each and they all should be the same.
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