Check the eMMC "health report." If the life cycle is over 90% used, the chip must be replaced.
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If your is stuck on the logo, restarting constantly, or showing no power despite good voltage rails, the problem is likely a corrupted eMMC chip. To fix this without removing the BGA chip, you need the ISP (In-System Programming) pinout for the RSAG7.820.7918 mainboard. Board Specifications Model: Hisense 55A6100UW / H55A6100 Mainboard Number: RSAG7.820.7918 / ROH SoC/Processor: MSD6586PGE eMMC Chip: Samsung KLM4G1FEPD or THGBMNG5D1LBAIL eMMC ISP Pinout Connections Check the eMMC "health report
Always read and save the original "dump" (even if corrupted) before writing new software. Check the eMMC "health report