Samsung Galaxy S21 Ultra – Kein Empfang wegen unscheinbarem Defekt!

🔧 Repair Service: 👉 https://www.smartronik-repair.de/ This Samsung Galaxy S21 Ultra had a strange problem: Mobile reception was intermittent or would drop out completely mid-call. In this video, I show you step-by-step how I found the fault – from the initial suspicion of a defect in the mainboard to a detailed analysis under a microscope. In the end, it turns out that the culprit was a tiny but crucial component – ​​the antenna cable connector on the sub-board. I explain: How reception problems manifest themselves on the S21 Ultra What the typical causes are (antenna cable, sub-board, casing warping) Why this fault is easily overlooked How to reliably fix the problem Ideal for anyone who wants to understand why their Galaxy suddenly has no network connection – and how to solve the problem professionally. 📲 Find more repairs, tips, and analyses on my SMARTRONIK channel. Subscribe, comment, and share the video if you enjoy these kinds of tech insights. ________________________________________ 🔧 Want to repair your device yourself? Here you'll find everything you need: ________________________________________ 🧴 Consumables 🔹 Camera lens cleaner * → https://amzn.to/4l5JuvH 🔹 Microfiber cloths (1000 pieces) * → https://amzn.to/3CGUTkA 🔹 Isopropanol * → https://amzn.to/4aHPpTg 🔹 White spirit * → https://amzn.to/3WI4wXh 🔹 Thermal paste * → https://amzn.to/4higyil 🔹 Double-sided adhesive tape * → https://amzn.to/4hHAmvl 🔹 Adhesive * → https://amzn.to/4jIEjkW 🔹 Desoldering braid * → https://amzn.to/3WKna0C 🔹 Solder wire * → https://amzn.to/3X7lHBR 🔹 Kapton Tape * → https://amzn.to/42JihsB 🔹 Flux * → https://amzn.to/42D0wLe 🔹 ESD Gloves * → https://amzn.to/4gnqghW 🔹 Screen Cleaning Foam * → https://amzn.to/42yVxeE 🔹 Cleaning Clay * → https://amzn.to/4n2un6s ________________________________________ 🔧 Tools 🔹 Screwdriver Set * → https://amzn.to/3Ejnehs 🔹 Hot Air Station * → https://amzn.to/3QSDxFc 🔹 Soldering Station * → https://amzn.to/3QQqhkF 🔹 Charging Port Tester * → https://amzn.to/3WOx6qH 🔹 Opening Tools * → https://amzn.to/4jCu9lX 🔹 Dust Blower * → https://amzn.to/4hlTOh9 🔹 Suction Cup Opening Tool * → https://amzn.to/40DzMI1 🔹 Torque Screwdriver * → https://amzn.to/3Cw0OsQ 🔹 Isopropyl Alcohol Bottle * → https://amzn.to/4aIScM4 🔹 Spudger * → https://amzn.to/42yVxeE 🔹 Metal Spudger * → https://amzn.to/4hlSkDK 🔹 Ceramic Tweezers * → https://amzn.to/4hlSkDK 🔹 Curved Screen Disassembler * → https://amzn.to/4aEaFtj 🔹 ESD Tweezers * → https://amzn.to/4ovbhrp 🔹 ESD Brush * → https://amzn.to/3WI4wXh 🔹 Bosch Cordless Screwdriver * → https://amzn.to/412GfOd 🔹 Bosch Torque Attachment * → https://amzn.to/42CTDd3 🔹 Bit Adapter * → https://amzn.to/4hJ1KJf ________________________________________ 📢 Stay up-to-date with repair tips & tutorials: 🔔 Subscribe to Smartronik now: @smartronik ________________________________________ About me: I'm Manuel from Smartronik and I'll take you along on my Everyday Repair Work. Whether it's cell phone, tablet, or laptop repairs – here you'll get exciting insights into the repair process, tips for buying a cell phone, and troubleshooting. Whether it's a screen replacement or battery repair – I'll teach you how to do it right! #GalaxyS21Ultra #NoReception #cellphonerepair Chapters 00:00 No reception on the Galaxy S21 Ultra 00:25 Initial troubleshooting 01:00 Antenna cable discovered 02:00 Microscopic examination 03:40 Cause of the reception problem 05:00 Replacing the sub-board 07:30 Installing a new back cover 10:50 Network test with SIM card 12:30 Vodafone/Telekom comparison 15:00 Problem finally resolved