Introduction
This guide demonstrates how to disconnect the left thumbstick in your Steam Deck OLED.
Tools
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            Insert an opening pick at an upward angle between the back cover and the front shell near one of the triggers. 
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            Slide your pick along the edge of the handle to release the clips securing it to the front shell. 
 
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            Reinsert your pick and slide it along the top and bottom edges until the back cover feels loose. 
 
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            Grip the unclipped handle and pull it away from the front shell to release the remaining clips. 
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            Remove the back cover. 
 
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            Grip the battery cable pull tab, located to the left of the battery. 
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            Firmly pull the battery cable straight away from the motherboard shield (toward the battery) to disconnect it. 
 
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            Use the point of a spudger to flip up the small locking flap on the left thumbstick ZIF connector. 
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            Use tweezers or your fingers to grip the cable's pull tab and slide the connector straight out of its socket to disconnect it. 
 
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To reassemble your device, follow these instructions in reverse order.