I Fixed a Dead $40 eBay B550 Motherboard. The SIO Chip, Again

This Gigabyte B550 Eagle WiFi6 (AMD AM4, Ryzen 3000/5000) was bought on eBay for $40, listed "for parts": good condition, no signs of life. The thermal camera found a regulator at 95°C, but replacing it did not fix the board. The real fault was a shorted Super I/O chip. In this repair: 🔍 The eBay listing: two sentences, I/O shield and screws included ⚡ Resistance checks on the main rails, then 110 mA in standby and no reaction to the power button 🔥 Thermal camera: a 5-pin LDO regulator at 95°C, its output almost a dead short to ground 🗺️ No boardview for this board, so I use the B550 Aorus Elite AX one to identify the AP7365 and the 3VDUAL line 🛠️ Checked the feedback divider and replaced the regulator from an X470 Aorus Gaming 7 WiFi donor board 🔋 Dead CMOS battery, and still no 3.3V: the short is on the SIO, not the regulator 🛠️ Replaced the Super I/O chip under the microscope ✅ 2.3 kΩ on the output, 3.3V on the SIO, POST screen: the board is back to life 🛠️ TOOLS I USE ON THE BENCH All tools featured in this repair are in my Amazon storefront (affiliate links): https://www.amazon.com/shop/fixthepixel ⚖️ DISCLAIMERS & DISCLOSURES FixThePixel assumes no liability for damage or injury from information in this video. For informational and educational purposes only. Attempt at your own risk. Music used requires no attribution. ⏱️ Chapters 0:00 $40 eBay "for parts" Gigabyte B550 Eagle WiFi6 1:23 Measuring resistance on the main rails 3:54 First power-on: no reaction 4:47 Thermal camera finds a 95°C component 6:01 Shorted LDO output under the microscope 7:03 Boardview: AP7365 regulator powers the SIO 8:36 Replacing the regulator from a donor board 11:25 Dead battery, and still no 3.3V 12:52 The short is on the SIO: replacing the chip 15:46 Final test: POST! 💬 Have you had a B550 or X570 board die with no reaction to the power button? Tell me your stories about faulty motherboards in the comments! 👍 Like and subscribe for more motherboard repairs. #MotherboardRepair #Gigabyte #B550 #AM4 #Microsoldering #ElectronicsRepair #PCRepair #NoPowerFix #FixThePixel