crwdns2915892:0crwdne2915892:0
Use this guide to replace a damaged or broken motherboard.
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            Use a Phillips head screwdriver to remove 5 screws from the camera. There are 2 4mm screws on the left side, 2 2mm screws on the right side and 1 4mm screw on the bottom. 
 
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            Use your fingers to pull the back cover off. 
 
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            Separate the button panel to reveal the port holding the screen on. 
 
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            Remove the yellow cable by pulling gently upwards, away from the inside of the camera, until it separates from its port. 
 
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            Remove 2 3mm screws from the metal plate covering the motherboard and lens using a Phillips #00 screw driver. 
 
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            Remove the 4 cables connecting the motherboard to the camera body. 
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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crwdns2947412:03crwdne2947412:0
Thanks for great info. I should add that one can also clean the sensor. Sensor is circular plate with 3 screws at back of the lens. Now the camera is like new!
Where can you buy a replacement motherboard?
ST76 and ST77 are very close relatives.
As it can be seen on the parts, some are marked: ”ST77”
Paul
