On a Bitmain Antminer hashboard, you’ll find several different types of capacitors. One of the most common issues occurs with the capacitor next to the booster—it often comes off the board due to physical pressure or rough handling.
If the antminer capacitor has come off, or even just become slightly loose, it must be reattached the correct way. Many people try to re-solder it without properly securing the connection. While it may look like it’s attached, a loose capacitor can easily come off again during operation.
🛠 Step-by-Step: Reattaching a Loose or Detached Capacitor
1.Check for Loose Connection
- If the capacitor appears wobbly or unstable, it’s best to remove it completely and reinstall it properly.
- Place the hashboard on a hot plate to warm the area around the antminer capacitor. This softens the solder for easier removal.
2.Clean the Surface
- After safely removing the capacitor, clean the contact area on the hashboard.
- A clean and flat surface is crucial. If the area is uneven, the new connection may be unstable, and the capacitor could detach again.
3. Apply Solder Paste
- Once the surface is cleaned and leveled, apply a small amount of solder paste.
- Avoid using too much—excessive paste can create an unbalanced height, which may result in another weak connection.
4.Reattach the Capacitor
- Place the bitmain hashboard back on the hot plate (temperature: 280 – 300)
- When the solder becomes shiny (indicating it’s at the right temperature), gently place the capacitor in its proper position.
- Let it sit for 30–40 seconds to ensure it bonds firmly with the board.
5.Cool and Inspect
- Allow the board to cool before touching the antminer capacitor.
- Once cooled, check that the component is solidly attached and doesn’t shift under light pressure.
🧠 Final Tip
Whether you’re working on a Bitmain S19 or any other Antminer model, proper handling of capacitors is critical for long-term stability. A clean surface, even solder level, and correct alignment are the keys to a successful capacitor repair.