{"id":13029,"date":"2022-01-10T21:09:00","date_gmt":"2022-01-10T13:09:00","guid":{"rendered":"https:\/\/rewa.tech\/iphone-xr-no-boot-issue-repair\/"},"modified":"2025-07-10T15:41:17","modified_gmt":"2025-07-10T07:41:17","slug":"iphone-xr-wont-turn-on","status":"publish","type":"post","link":"https:\/\/rewa.tech\/fr\/iphone-xr-wont-turn-on\/","title":{"rendered":"Comment r\u00e9parer un iPhone XR qui ne s'allume pas : guide de diagnostic et de r\u00e9paration des courts-circuits."},"content":{"rendered":"<p>When your iPhone XR won\u2019t turn on, it can be frustrating \u2014 especially when there\u2019s no visible damage. In this repair case, we\u2019ll show you how a short circuit near the audio amplifier IC caused the iPhone XR to draw excessive current and fail to boot. Using professional tools like a DC power supply, rosin, and REFOX Bitmap, we accurately diagnosed and fixed the issue by replacing a faulty capacitor.<\/p>\n\n\n\n<p>Whether you&#8217;re a repair technician, a DIYer, or a repair shop owner, this detailed guide will help you approach similar &#8220;no boot&#8221; cases with confidence.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Repair Case: iPhone XR Not Powering On<\/h3>\n\n\n\n<p>Upon receiving the iPhone XR, we connected it to a <strong>Alimentation en courant continu<\/strong> for diagnosis. The current draw was around <strong>1A<\/strong>, indicating a possible <strong>court-circuit<\/strong> on the board.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<p>Since the current leakage starts immediately after connecting to DC power, we suspected a short on one of the following power rails:<\/p>\n\n\n\n<ul class=\"wp-block-list has-cyan-bluish-gray-background-color has-background\">\n<li><code>PP_BATT_VCC<\/code><\/li>\n\n\n\n<li><code>PP_VDD_MAIN<\/code><\/li>\n\n\n\n<li><code>PP_VDD_BOOST<\/code><\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/Current_leakage.png\" alt=\"alimentation en courant continu\" title=\"\"><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p>The iPhone XR\u2019s board structure is similar to that of older models like the iPhone 8 Plus. Based on experience, we can use either the <strong>m\u00e9thode d'inspection de la colophane<\/strong> or a <strong>imageur thermique<\/strong> to detect overheating components.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/XR_Motherboard_Components_Distributions.png\" alt=\"iphone xr board vs iphone 8 plus\" title=\"\"><\/figure>\n\n\n\n<p>Before using any tools, we first applied a simple method: <strong>finger test while applying DC power<\/strong>. We felt unusual heat around the <strong>audio amplifier IC<\/strong> area.<\/p>\n\n\n\n<p>To confirm, we applied <strong>colophane<\/strong> to the board and powered it again. The rosin melted directly on top of the <strong>audio amplifier IC<\/strong>, confirming heat in that area.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/Audio_Amplifier_IC.png\" alt=\"iphone a12 chip\" title=\"\"><\/figure>\n\n\n\n<p>At this point, most would replace the audio amplifier IC. However, due to its proximity to the CPU, replacing it could risk <strong>Pseudo-brasage de l'unit\u00e9 centrale<\/strong> (a condition where CPU connections become unstable from heat exposure). Additionally, the audio amplifier circuit has multiple power lines, meaning a shorted <strong>capacitor<\/strong> could also be the cause.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Narrowing Down the Issue<\/h2>\n\n\n\n<p>Using this insight, we inspected the <strong>small capacitors around the audio amplifier IC<\/strong>. Sure enough, we located a <strong>shorted capacitor<\/strong>, as shown in the image (marked with an arrow in the original content).<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/shorted_Capacitor.png\" alt=\"iPhone XR ne d\u00e9marre pas\" title=\"\"><\/figure>\n\n\n\n<p>By checking with the <strong><a href=\"https:\/\/refoxteam.com\/\" target=\"_blank\" rel=\"noopener\">REFOX Bitmap<\/a><\/strong>, we identified this capacitor belonged to the <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong>PP_SPKAMP_TOP_VBOOST<\/strong><\/mark> power rail.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/C5022.png\" alt=\"iphone xr diagram\" title=\"\"><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Processus de r\u00e9paration<\/h3>\n\n\n\n<p>We removed the faulty capacitor and tested the current draw again. The startup current returned to <strong>normal levels<\/strong>.<\/p>\n\n\n\n<p>Next, we replaced the capacitor with one of <strong>identical specification<\/strong>. After reinstalling, the iPhone XR <strong>booted up normally<\/strong>.<\/p>\n\n\n\n<p>We reassembled the phone and conducted a full function test \u2014 all features worked perfectly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pro Tips<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In this case, replacing a single shorted capacitor was enough to fix a severe no-boot issue.<\/li>\n\n\n\n<li>When multiple components feel hot, <strong>check small passive components<\/strong> (like capacitors) first.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/iPhone_XR_No_Boot.png\" alt=\"L&#039;iPhone XR ne d\u00e9marre pas\" title=\"\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion :<\/strong><\/h2>\n\n\n\n<p>A no-boot iPhone XR might seem like a major failure, but with the right diagnostic approach, even complex issues like short circuits can be fixed efficiently. In this case, a careful inspection revealed a shorted capacitor near the audio amplifier IC, and replacing it brought the phone back to life. This repair highlights the importance of understanding circuit behavior, using boardview tools like REFOX Bitmap, and not rushing to replace major chips. If you&#8217;re in the repair business or enjoy DIY phone repairs, mastering these diagnostic techniques can save you time, reduce risk, and improve success rates.<\/p>","protected":false},"excerpt":{"rendered":"<p>When your iPhone XR won\u2019t turn on, it can be frustrating \u2014 especially when there\u2019s no visible damage. In this repair case, we\u2019ll show you how a short circuit near the audio amplifier IC caused the iPhone XR to draw excessive current and fail to boot. Using professional tools like a DC power supply, rosin, [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":13030,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[1485,16,13,158,447],"tags":[21,293,153],"class_list":["post-13029","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-study","category-blog","category-how-to","category-iphone-guide","category-troubleshooting","tag-iphone","tag-iphone-xr","tag-phone-repair"],"_links":{"self":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/13029","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/comments?post=13029"}],"version-history":[{"count":0,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/13029\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media\/13030"}],"wp:attachment":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media?parent=13029"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/categories?post=13029"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/tags?post=13029"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}