{"id":13077,"date":"2022-05-13T20:08:00","date_gmt":"2022-05-13T12:08:00","guid":{"rendered":"https:\/\/rewa.tech\/how-to-fix-iphone-xr-no-baseband-issue\/"},"modified":"2025-07-10T14:30:15","modified_gmt":"2025-07-10T06:30:15","slug":"iphone-xr-baseband-issue","status":"publish","type":"post","link":"https:\/\/rewa.tech\/it\/iphone-xr-baseband-issue\/","title":{"rendered":"Come risolvere il problema della banda base dell'iPhone XR: Guida completa alla riparazione"},"content":{"rendered":"

Facing a baseband issue on your iPhone XR? This common problem can prevent the device from activating, displaying “No Service,” or failing to detect a mobile network altogether. In this article, we guide you through a real-world iPhone XR baseband issue repair case \u2014 covering precise diagnostics, baseband CPU resoldering, and transceiver IC replacement. Whether you’re a technician, repair shop, or DIY enthusiast, this guide provides actionable insights to help you fix the issue and avoid common repair mistakes.<\/p>\n\n\n\n

Important Pre-Repair Tip<\/h2>\n\n\n\n

If your iPhone XR has no baseband<\/strong> o nessun segnale<\/strong>, DO NOT restore or recover the phone before repair<\/strong>.
A device that’s restored with a baseband issue becomes unrepairable<\/strong>, effectively turning it into a non-functional unit.
If left unrestored, even if it can’t be repaired, it can still function as a Wi-Fi-only gaming device<\/strong>.<\/p>\n\n\n\n

iPhone XR Baseband Issue Repair Process<\/h2>\n\n\n\n

Fase 1: Diagnosi iniziale<\/h3>\n\n\n\n

We received an iPhone XR with a baseband issue<\/strong> \u2014 it had been previously serviced by another repair shop, but the problem persisted. Upon opening the device:<\/p>\n\n\n\n

    \n
  • The shielding cover over the baseband chips had been removed.<\/li>\n\n\n\n
  • The NAND chip had been resoldered and sealed with black glue.<\/li>\n\n\n\n
  • The area around the baseband CPU (U_BB_K)<\/strong> showed blackened capacitors and resistors \u2014 a clear sign of corrosion from poor-quality solder paste<\/strong>.<\/li>\n<\/ul>\n\n\n\n

    Step 2: Resoldering Surrounding Components<\/h3>\n\n\n\n

    To start:<\/p>\n\n\n\n

      \n
    • Applicato rosin flux<\/strong> to the affected area.<\/li>\n\n\n\n
    • Used a pistola ad aria calda<\/strong> to reflow and resolder the small passive components around the baseband CPU.<\/li>\n\n\n\n
    • Cleaned the logic board using Pulitore per PCB<\/strong> for better visibility and soldering results.<\/li>\n<\/ul>\n\n\n\n
      \"\"<\/figure>\n\n\n\n

      Step 3: Removing and Inspecting Baseband CPU<\/h3>\n\n\n\n

      After removing the U_BB_K (baseband CPU)<\/strong>:<\/p>\n\n\n\n

        \n
      • Scratch marks were found near the chip \u2014 likely due to scraping by the previous technician.<\/li>\n\n\n\n
      • Fortunately, no damage to the internal PCB layers<\/strong> was detected.<\/li>\n\n\n\n
      • The old solder was identified as pasta saldante a bassa temperatura<\/strong> \u2014 it melts easily but has poor bonding strength and causes corrosion.<\/li>\n<\/ul>\n\n\n\n

        We then resoldered the baseband CPU using medium-temperature solder paste<\/strong>, ensuring a more durable and reliable connection.<\/p>\n\n\n\n

        \"How<\/figure>\n\n\n\n

        After replacing the transceiver IC with a new one, then restoring it with iTunes the baseband and signal function back to normal. <\/p>\n\n\n\n

        Sintesi<\/h2>\n\n\n\n

        The issue is caused by the Baseband CPU and transceiver IC, the previous repair shop repaired the two parts. But because of the poor soldering handwork and poor-quality solder paste, the issue does not get fixed thoroughly.<\/p>\n\n\n\n

        Lessons learned from this case, do more handwork practice if you want to be a repair expert, and use qualified repair materials, do not solder the Baseband chip with low-temperature solder paste!<\/p>","protected":false},"excerpt":{"rendered":"

        Facing a baseband issue on your iPhone XR? This common problem can prevent the device from activating, displaying “No Service,” or failing to detect a mobile network altogether. In this article, we guide you through a real-world iPhone XR baseband issue repair case \u2014 covering precise diagnostics, baseband CPU resoldering, and transceiver IC replacement. Whether […]<\/p>\n","protected":false},"author":10,"featured_media":13078,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[780],"tags":[],"class_list":["post-13077","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-iphone-repair-cases"],"_links":{"self":[{"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/posts\/13077","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/comments?post=13077"}],"version-history":[{"count":0,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/posts\/13077\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/media\/13078"}],"wp:attachment":[{"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/media?parent=13077"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/categories?post=13077"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/tags?post=13077"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}