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Samsung Smartwatch S3 Frontier Main Board | Samsung Gear S3 Frontier Motherboard - Mobile Phone Housings & Frames - Aliexpress
Replaced the motherboard and now everything is back to normal! : r/GearS3
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1xMain Logic/Motherboard Replace Parts Set for Samsung Gear S3 Frontier SM-R765A | eBay
Samsung Smartwatch S3 Frontier Main Board | Samsung Gear S3 Frontier Motherboard - Mobile Phone Housings & Frames - Aliexpress