Introduction
How to dismantle, resolder power switch, and reassemble the BT 250 Baby Monitor
What you need
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Unclip the battery cover, and remove the batteries (they're a tight fit - the purple ribbon should help though)
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Remove the two phillips screws at the lower edge of the battery compartment
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The casing is now held together by a pair of snap-fixings on each side, which will require careful prising apart.
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Using the picture as a guide to show where the catches are (red circles), use a small screwdriver or a spudger-type tool to release them levering outwards, then carefully separate the two halves of the casing
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The LCD is held on by a pair of small plastic lugs, one each side. Release these one at a time, while gently lifting the LCD up from the board.
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Once both clips are released, it will hinge forward and down.
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Remove the two screws from under the LCD
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Remove the single screw in the middle of the lower part of the PCB
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Gently bend up the two charging connectors on the lower edge of the PCB that stick through the case to free it
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Lift the PCB from the case, lower edge first
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With the PCB removed, inspect the switches along the top edge.
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On mine, the solder holding the switch mounting tabs to the PCB had failed, leaving both tabs and pads intact
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Carefully resolder these, ensuring enough heat is applied to ensure a good joint, but without damaging neighbouring components
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Reassembly is the reverse of dismantling.
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Remember to bend the charging connectors back into place so they are correctly seated
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Replace the vibrate motor into its' groove.
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Ensure the switches all operate correctly before clipping the two case halves back together - sometimes the little pieces of adhesive foam on the 'button pressers' need to be adjusted.
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To reassemble your device, follow these instructions in reverse order.
