Introduction
Guide is to replace the hinge of the Toshiba Satellite P855-S5312 . Reasons for replacement would be if the screen will not stay in place being to flimsy because hinge. Tools required for guide are phillips size 0 screwdriver.
Tools
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            Unscrew the one 1.5mm screw using a Philips #0 screwdriver holding the L shape panel. 
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            Pry up the panel to gain access to hidden screws. 
 
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            Remove the fourteen (14) screws using a Philips #0 screwdriver for the 1.5mm screws on the underside of casing. 
 
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            Unscrew the nine 1.5mm screws using a Philips #0 screwdriver under the keyboard with the F6 printed next to them. 
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            Unplug the three no-fuss ribbon cable connector cables by gently pulling on them away from you towards the keyboard. 
 
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            Unplug the single no-fuss cable connector using the plastic opening tool pushing the edges towards the fan. 
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            Unscrew the two 1.5mm screws using a Philips #0 screwdriver by the head mounting holding down the fan. 
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            Pull the fan up and remove it from the device. 
 
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            Unplug the single ZIF connector ribbon by gently pulling up. 
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            Pull the white and black wires through from the underside of device. 
 
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            Unscrew the four hinges mounting the 1.5mm screws on each side from casing using a Philips #0 screwdriver. 
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            Remove entire screen assembly from casing. 
 
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            Locate the two black sticker covers on the bottom of both sides of the monitor 
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            Using a pair of tweezers, carefully remove black stickers concealing two screws 
 
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            Using the Philips #0 screwdriver, remove the four 1.5mm screws at the corners of the screen. 
 
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            At the top of the screen, using the tweezers, remove the ZIF ribbon connector by gently pushing it up. 
 
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            Remove the three screws on the sides of the screen using the Philips #0 screwdriver. 
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            Once unscrewed, pull the frame off along with the hinge. 
 
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To reassemble your device, follow these instructions in reverse order.