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This method works for many Roborock models.
Please do follwing steps:
1. Clean power pads (vacuum & charger). Test the system. If does not work, go to step 2.
2. Check charger voltage. It should be ~4,2V without load and ~19,6V with load. If the voltage is correct, skip to step 3.
3. It looks like your fuse is damaged. Please replace it according to this video.
Fuse model: RUEF300 PTC 3A 30V
New fuse costs ~0,2 USD.
Other helpful video (for Roborock S50):
• [EN] Roborock S50 - Er...