https://smarthome-aber-sicher.de/en/tags/roller-shutter/ Recent content in Roller Shutter on Smart Home? Sure — But Secure! Hugo -- gohugo.io en Sun, 21 Sep 2025 00:00:00 +0200 https://smarthome-aber-sicher.de/en/blog/2025/09/21/repairing-broken-shellys-the-30-cent-fix-that-actually-works/ Sun, 21 Sep 2025 00:00:00 +0200 https://smarthome-aber-sicher.de/en/blog/2025/09/21/repairing-broken-shellys-the-30-cent-fix-that-actually-works/ <img src="https://smarthome-aber-sicher.de/blog/2025/09/21/defekte-shellys-reparieren-die-30-cent-reparatur-die-wirklich-funktioniert/cover.png" alt="Featured image of post Repairing BROKEN Shellys – the 30 CENT Fix That Actually Works!" /><p>Is your Shelly 2.5 humming? Making strange noises or constantly dropping the Wi-Fi connection? Then you are probably familiar with the frustrating problem that many Shelly owners face: after a few years, these devices become increasingly unreliable.</p> <p>What looks like a Wi-Fi problem at first usually has a completely different cause. The good news: in most cases you can fix it yourself with a 50-cent repair!</p> <div class="video-wrapper"> <div class="video-placeholder" onclick="loadIframe(this)"> <img src="https://smarthome-aber-sicher.de/img/sas_youtube.png" alt="YouTube Video"> <div class="play-button"></div> <div class="privacy-notice" style="color: var(--card-text-color-main);"> To load the video, please click the image. Please note that by doing so, data will be transmitted to YouTube. </div> </div> </div> <script> function loadIframe(element) { var iframe = document.createElement('iframe'); iframe.setAttribute('loading', 'lazy'); iframe.setAttribute('src', 'https://www.youtube-nocookie.com/embed/q7yF7xyoduU'); iframe.setAttribute('allowfullscreen', ''); iframe.setAttribute('title', 'YouTube Video'); element.parentNode.replaceChild(iframe, element); } </script> <style> .video-placeholder { position: relative; cursor: pointer; } .video-placeholder img { width: 100%; height: auto; } .play-button { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 60px; height: 60px; background: url('/img/youtube_button.svg') no-repeat center center; background-size: contain; } .video-placeholder:hover .play-button { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 60px; height: 60px; background: url('/img/youtube_button_hover.svg') no-repeat center center; background-size: contain; } .privacy-notice { position: absolute; bottom: 50px; width: 100%; left: 50%; transform: translateX(-50%); background-color: rgba(0, 0, 0, 0.7); color: white; padding: 5px 10px; border-radius: 5px; font-size: 12px; text-align: center; } </style> <h2 id="the-problem-when-shellys-get-old">The Problem: When Shellys Get Old </h2><h3 id="recognizing-the-typical-symptoms">Recognizing the Typical Symptoms </h3><p>Shelly 2.5 devices of the first generation in particular show characteristic problems after a few years:</p> <ul> <li><strong>Strange noises:</strong> Humming or buzzing from the device</li> <li><strong>Unstable Wi-Fi connection:</strong> Sporadic disconnects</li> <li><strong>Unreliable operation:</strong> Commands are not executed</li> <li><strong>Complete failure:</strong> The device stops responding entirely</li> </ul> <p>In the video I demonstrate the characteristic sound — if your Shelly sounds like that, there is a good chance this repair will help!</p> <h3 id="the-root-cause-capacitor-aging">The Root Cause: Capacitor Aging </h3><p>What many people do not know: the problem is usually not the ESP8266 chip or the antenna, but a tiny electrolytic capacitor in the power supply. After years of use, it loses its electrical properties and destabilizes the entire power circuit.</p> <p>The tricky part: the capacitor looks completely normal from the outside — no bulging, no visible damage.</p> <h2 id="the-50-cent-repair-step-by-step">The 50-Cent Repair, Step by Step </h2><h3 id="what-you-need">What You Need </h3><ul> <li><strong>100µF/16V electrolytic capacitor</strong> (approx. 50 cents)</li> <li><strong>Soldering iron and solder</strong></li> <li><strong>Narrow flat-head screwdriver</strong></li> <li><strong>Some patience and care</strong></li> </ul> <p><strong>Important safety note:</strong> Never work on the Shelly while it is connected to mains power!</p> <h3 id="opening-the-case--the-flat-head-screwdriver-trick">Opening the Case — the Flat-Head Screwdriver Trick </h3><p>Opening the Shelly 2.5 is a little tricky, but perfectly doable with the right approach. In the video I show you exactly:</p> <ul> <li>Where to insert the flat-head screwdriver</li> <li>How to carefully pry off the casing</li> <li>What to watch out for with the delicate tabs</li> </ul> <p>The trick is to work systematically along the sides without applying too much force.</p> <h3 id="identifying-the-faulty-capacitor">Identifying the Faulty Capacitor </h3><p>Once opened, you can see the compact circuit board with all its components. The problematic capacitor is the small black cylinder marked &ldquo;100µF 16V&rdquo;. In the video I explain exactly:</p> <ul> <li>Where the capacitor is located</li> <li>How to distinguish it from other components</li> <li>What other capacitors are present on the board</li> </ul> <h3 id="removing-the-faulty-capacitor">Removing the Faulty Capacitor </h3><p>Desoldering requires some skill, but is very manageable with the right technique. I show you in the video:</p> <ul> <li>How to carefully tilt the capacitor out</li> <li>The correct soldering iron technique</li> <li>How to clear the holes after removal</li> </ul> <p>Particularly important: the capacitor sits on the outer edge of the board and is therefore relatively easy to reach.</p> <h3 id="installing-the-new-capacitor-correctly">Installing the New Capacitor Correctly </h3><p>With electrolytic capacitors, polarity is critical:</p> <ul> <li><strong>Negative pole:</strong> Marked with a broad stripe on the casing</li> <li><strong>Positive pole:</strong> The longer lead</li> </ul> <p>In the video I show in detail how to correctly identify the polarity and orient the capacitor. Getting this wrong would destroy the entire device!</p> <h3 id="reassembling-the-case">Reassembling the Case </h3><p>When reassembling, make sure to route the Wi-Fi antenna correctly. There is a dedicated notch in the case for it — the video shows you exactly how this works.</p> <h2 id="the-success-test--live-in-the-video">The Success Test — Live in the Video </h2><p>The most exciting moment: switching it on for the first time after the repair! In the video you can watch live:</p> <ul> <li>How the repaired Shelly boots up</li> <li>Testing the web interface</li> <li>Checking the relay function</li> <li>And most importantly: the listening test reveals complete silence!</li> </ul> <p>After a successful repair, the Shelly will run reliably for years to come.</p> <h2 id="other-affected-shelly-models">Other Affected Shelly Models </h2><p>The capacitor problem is not limited to the Shelly 2.5. Other models can be affected as well:</p> <ul> <li><strong>Shelly Dimmer</strong> (first generation)</li> <li><strong>Shelly 3EM</strong> (older versions)</li> <li><strong>Other first-generation Shellys</strong></li> </ul> <p>The repair principle remains the same — only the exact capacitor type may vary.</p> <h2 id="why-the-repair-is-worth-it">Why the Repair Is Worth It </h2><h3 id="sustainability-over-the-throwaway-mindset">Sustainability over the Throwaway Mindset </h3><p>Instead of discarding working hardware and buying new devices, you invest 15 minutes and 50 cents in materials. That is:</p> <ul> <li><strong>Environmentally friendly:</strong> Less electronic waste</li> <li><strong>Cost-saving:</strong> A new Shelly 2.5 costs over 20 euros</li> <li><strong>Educational:</strong> You understand your hardware better</li> </ul> <h3 id="long-term-reliability">Long-Term Reliability </h3><p>After the capacitor repair, the Shellys work like new again:</p> <ul> <li>Stable Wi-Fi connection</li> <li>No more strange noises</li> <li>Reliable response to commands</li> <li>Years of further trouble-free use</li> </ul> <h2 id="practical-tips-for-the-future">Practical Tips for the Future </h2><h3 id="preventive-measures">Preventive Measures </h3><p>Electrolytic capacitors age faster due to:</p> <ul> <li><strong>Heat:</strong> Avoid excessively warm installation locations</li> <li><strong>Moisture:</strong> Ensure a dry environment</li> <li><strong>Overvoltage:</strong> Use surge protection</li> </ul> <h3 id="when-is-a-repair-worth-attempting">When Is a Repair Worth Attempting? </h3><p>The repair is most promising for:</p> <ul> <li>Devices older than 2–3 years</li> <li>Typical noise problems</li> <li>Sporadic Wi-Fi dropouts</li> <li>Devices that are still partially functional</li> </ul> <h2 id="more-hardware-repairs">More Hardware Repairs </h2><p>This repair impressively demonstrates that smart home can be sustainable! The video shows not just the practical implementation, but also my thought process during troubleshooting.</p> <h2 id="more-repair-guides">More Repair Guides </h2><ul> <li><a class="link" href="https://smarthome-aber-sicher.de/post/repair-sonoff-s20/" >Repairing a Sonoff S20 Smart Plug – the 26-Cent Fix</a> – The same capacitor problem, different device: fixing Wi-Fi disconnects on the Sonoff S20</li> <li><a class="link" href="https://smarthome-aber-sicher.de/post/repair-tablet/" >Replacing a Tablet Battery Yourself – Save Your Old Device in 20 Minutes!</a> – When the tablet used as a smart home dashboard only works while plugged in</li> </ul> <blockquote> <p>Note: Links marked with <em>affiliate link</em> are affiliate links. As an Amazon Associate I earn from qualifying purchases. This means I receive a small commission if you purchase through these links — at no extra cost to you. The revenue helps me run this blog and YouTube channel and keep creating content. Thank you for your support!</p><span class="cite"><span>― </span><span>Joachim</span><cite></cite></span></blockquote>