Introduction
Warning: The flash capacitors located under the front grip contain dangerous amounts of stored charge and will need to be safely discharged before removing the motherboard. Use a Capacitor Discharging Tool to do so.
The motherboard is crucial for the function of both the software and hardware of the Sony a6500 camera; its failure will result in an inoperable device. If your camera is failing to turn on despite having a functional battery, the motherboard may need replacing. This guide will walk you through the replacement of the motherboard; it requires more steps than the other guides because it is embedded deep inside the camera. This guide will require opening tools, spudger, tweezers, JIS 0 screwdriver, JIS 00 screwdriver, and JIS 000 screwdriver.
Tools
Parts
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            Press the flash popup button on the back of the camera. 
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            Remove one 5 mm JIS 00 screw from inside the flash compartment. 
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            Remove one 4 mm JIS 00 screw. 
 
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            Remove the 2.5 mm JIS 00 screw from the side of the camera near the viewfinder. 
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            Use the opening tool to pry off the small cover. 
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            Remove two 2.5 mm JIS 00 screws from underneath the cover. 
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            Remove a 5 mm JIS 00 screw from underneath the cover. 
 
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            Remove three 2.5 mm JIS 0 screws from the back face of the camera. 
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            Remove one 4 mm JIS 00 screw from the underside of the lip that overhangs the back of the camera. 
 
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            Flip the battery lock switch to open and open the battery compartment. 
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            Remove three 2.5 mm JIS 00 screws from the top of the battery compartment. 
 
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            Use the plastic opening tool to begin prying off the back of the camera from the side. 
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            Continue to loosen the back until you can open it from the bottom. 
 
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            Use the plastic opening tool to peel down the rubber grip around the handle at least 1 cm. 
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            Remove one 3 mm JIS 000 screw from underneath the rubber grip on the right side. 
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            Remove one 4 mm JIS 000 screw from the left side. 
 
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            Insert a long, thin JIS 00 screwdriver through the two holes and into the battery compartment; remove the two 5mm JIS 00 screws inside it. 
 
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            Use the long, thin, screwdriver to remove one 5 mm JIS 00 screw inside the camera accessible below the dials from the back. 
 
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            Use the plastic opening tool to gently lift up the shutter button assembly. 
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            Grasp the front grip from the top and bottom and pull it off. It should come off easily with the shutter button out of the way. 
 
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            Remove one 2.5 mm JIS 00 screw from where the shutter button assembly used to be. 
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            Remove one 3 mm JIS 00 screw from the side of the camera. 
 
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            Carefully unplug the two ribbon connectors attaching the top assembly to the rest of the camera. 
 
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            From the top of the camera remove one 4mm JIS 00 screw. 
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            Remove one 5mm JIS 00 screw and the plastic bushing around it. 
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            Remove the viewfinder's protective cover. 
 
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            Use the spudger to pry the light sensor off the side of the viewfinder. 
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            Remove one 2.5mm JIS 000 screw on the side of the viewfinder to release it. 
 
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            Lift the viewfinder out and flip up the tab to release the wire ribbon where it is connected to the motherboard. 
 
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            Remove two 2.5mm JIS 00 screws from the left side and bottom of the copper shielding. 
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            Remove two 2mm JIS 000 screws from the right side of the copper shielding. 
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            Pull the entire copper shielding piece off. 
 
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            Remove one 4mm JIS 00 screw holding down a plastic spacer on the bottom left of the motherboard. 
 
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            Carefully use tweezers to remove four wire ribbons on the right side of the motherboard. 
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            Remove the last two wire ribbons on the top of the motherboard by flipping up the locking tab and pulling them out. 
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            Pull the blue coaxial cable up off the board. 
 
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            Remove one 4mm JIS 00 screw from the upper right of the motherboard and another from the far left. 
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            Remove the plastic housing for the power and HDMI ports. 
 
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            Grasp the motherboard from the sides and lift it up. It is still connected by two wires on the bottom right side. 
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            Pull the wire ribbon on the underside off with tweezers. 
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            After you have discharged the capacitor, pull the yellow wire harness out using tweezers. 
 
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To reassemble your device, follow these instructions in reverse order.