{"id":13119,"date":"2022-06-02T21:20:00","date_gmt":"2022-06-02T13:20:00","guid":{"rendered":"https:\/\/rewa.tech\/iphone-12-cannot-boot\/"},"modified":"2025-07-11T15:44:55","modified_gmt":"2025-07-11T07:44:55","slug":"liphone-12-ne-demarre-pas-apres-une-chute","status":"publish","type":"post","link":"https:\/\/rewa.tech\/fr\/iphone-12-wont-boot-after-drop\/","title":{"rendered":"L'iPhone 12 ne d\u00e9marre pas apr\u00e8s une chute ? Comment r\u00e9parer les dommages de la carte logique, \u00e9tape par \u00e9tape"},"content":{"rendered":"<p>Lorsqu'un iPhone 12 subit une chute importante, ce n'est pas seulement l'\u00e9cran ou le verre arri\u00e8re qui souffre - les composants de la carte logique interne peuvent \u00e9galement subir de graves dommages. Si votre iPhone 12 ne d\u00e9marre pas et n'affiche qu'un courant fixe d'environ 70 mA sur une alimentation en courant continu, ce guide d\u00e9taille un cas r\u00e9el de r\u00e9paration au niveau de la carte. Nous verrons comment identifier les dommages subis par la carte NAND ou le processeur, effectuer des \u00e9changes de puces chiffr\u00e9s et remettre le t\u00e9l\u00e9phone en \u00e9tat de marche. Ce guide est parfait pour les techniciens de r\u00e9paration avanc\u00e9s, les reconditionneurs et les propri\u00e9taires d'ateliers de r\u00e9paration.<\/p>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile is-image-fill-element has-white-color has-electric-grass-gradient-background has-text-color has-background has-link-color wp-elements-275685d352bab8c108a561b68b1d3efa\"><figure class=\"wp-block-media-text__media\"><img fetchpriority=\"high\" decoding=\"async\" width=\"866\" height=\"1024\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/iPhone_12-866x1024.png\" alt=\"iphone 12\" class=\"wp-image-14711 size-full\" style=\"object-position:50% 25%\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/iPhone_12-866x1024.png 866w, https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/iPhone_12-254x300.png 254w, https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/iPhone_12-768x909.png 768w, https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/iPhone_12.png 940w\" sizes=\"(max-width: 866px) 100vw, 866px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<h3 class=\"wp-block-heading\">Vue d'ensemble de l'appareil<\/h3>\n\n\n\n<p><strong>Mod\u00e8le :<\/strong> iPhone 12<\/p>\n\n\n\n<p><strong>Date de sortie :<\/strong> Octobre 2020<\/p>\n\n\n\n<p><strong>Enjeu :<\/strong> Dommages physiques importants, \u00e9cran\/dos fissur\u00e9, impossibilit\u00e9 de d\u00e9marrer<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Diagnostic initial : Le t\u00e9l\u00e9phone ne d\u00e9marre pas<\/h2>\n\n\n\n<p>Apr\u00e8s avoir d\u00e9mont\u00e9 l'iPhone 12, la carte m\u00e8re a \u00e9t\u00e9 test\u00e9e \u00e0 l'aide d'une alimentation en courant continu. Le courant de d\u00e9marrage est rest\u00e9 fixe \u00e0 <strong>~70mA<\/strong>Un indicateur courant d'une d\u00e9faillance de la NAND ou de l'unit\u00e9 centrale.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/diassemble_the_phone_and_take_out_the_motherboard.png\" alt=\"iphone 12 dissemble\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/01__connect_the_motherboard_with_the_DC_power_supply__trigger_to_boot.png\" alt=\"carte m\u00e8re iphone 12\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Inspection interne du conseil d'administration<\/h2>\n\n\n\n<p>La carte m\u00e8re a \u00e9t\u00e9 s\u00e9par\u00e9e en couches sup\u00e9rieure et inf\u00e9rieure \u00e0 l'aide d'une plate-forme chauffante. Apr\u00e8s inspection :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Certains coussinets \u00e9taient manquants.<\/li>\n\n\n\n<li>Le <strong>La puce NAND pr\u00e9sente une l\u00e9g\u00e8re fissure<\/strong> sur le bord.<\/li>\n\n\n\n<li>Le reste du tableau semblait intact.<\/li>\n<\/ul>\n\n\n\n<p>Dans des circonstances normales, le retrait de la carte NAND permet toujours au t\u00e9l\u00e9phone de se connecter \u00e0 iTunes ou \u00e0 3uTools, mais ce n'\u00e9tait pas le cas ici. Cela a fait na\u00eetre des soup\u00e7ons de dommages au niveau de l'unit\u00e9 centrale.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/Heat_and_separate_the_motherboard.png\" alt=\"carte m\u00e8re iphone 12\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/02__When_checking_the_NAND_chip_under_the_microscope_we_can_see_there_is_a_little_crack_at_the_edge.png\" alt=\"iphone 12 nand\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Retrait de la NAND et du CPU<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Enlever soigneusement la colle noire autour de la carte NAND \u00e0 l'aide d'un couteau \u00e0 sculpter et d'un pistolet thermique.<\/li>\n\n\n\n<li>J'ai chauff\u00e9 la puce jusqu'\u00e0 ce que la soudure fonde et je l'ai enlev\u00e9e.<\/li>\n\n\n\n<li>La carte sous NAND a \u00e9t\u00e9 <strong>fortement d\u00e9form\u00e9e (en forme de balancier).<\/strong><\/li>\n\n\n\n<li>L'unit\u00e9 centrale a ensuite \u00e9t\u00e9 retir\u00e9e et inspect\u00e9e - <strong>pas de fissures visibles ni de plaquettes manquantes.<\/strong><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/03__Heat_the_whole_NAND_on_the_surface_evenly__when_tins_get_melt_insert_the_blade_knife_to_pry_it_up.png\" alt=\"r\u00e9paration de l&#039;iphone 12\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/04__After_remove_the_NAND_we_can_see_the_board_get_deformed_seriously.png\" alt=\"carte m\u00e8re iphone 12\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/CPU_looks_fine.png\" alt=\"carte m\u00e8re iphone 12\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Processus de r\u00e9paration par \u00e9change de puces<\/h2>\n\n\n\n<p>Compte tenu de la d\u00e9formation physique, la solution la plus probable est la suivante <strong>transplantation de puces crypt\u00e9es<\/strong> \u00e0 un nouveau conseil d'administration.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Les \u00e9l\u00e9ments suivants ont \u00e9t\u00e9 \u00e9chang\u00e9s entre la carte endommag\u00e9e et la carte du donneur :<\/strong>\n<ul class=\"wp-block-list\">\n<li>Puce NAND<\/li>\n\n\n\n<li>UNIT\u00c9 CENTRALE<\/li>\n\n\n\n<li>Logique EEPROM<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Connecter la carte logique sup\u00e9rieure \u00e0 l'alimentation en courant continu - le t\u00e9l\u00e9phone a d\u00e9marr\u00e9 avec succ\u00e8s !<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/05__Swap_the_NAND__CPU_and_logic_EEPROM_one_by_one.png\" alt=\"puce iphone 12 a14\" title=\"\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Changement de puce de la carte de signalisation<\/h2>\n\n\n\n<p>Pour r\u00e9tablir les fonctions de r\u00e9seau et de connectivit\u00e9 :<\/p>\n\n\n\n<p>L'unit\u00e9 centrale de bande de base et la puce Wi-Fi ont \u00e9galement \u00e9t\u00e9 transf\u00e9r\u00e9es sur la carte de signal du donneur.<\/p>\n\n\n\n<p>Avec les deux couches de la carte connect\u00e9es temporairement pour les tests, le t\u00e9l\u00e9phone a red\u00e9marr\u00e9 correctement.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/06__Swap_the_WIFI_and_Baseband_CPU.png\" alt=\"r\u00e9paration de l&#039;iphone 12\" title=\"\"><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Assemblage final<\/h3>\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<ul class=\"wp-block-list\">\n<li>Les couches sup\u00e9rieures et inf\u00e9rieures ont \u00e9t\u00e9 recoll\u00e9es de fa\u00e7on permanente.<\/li>\n\n\n\n<li>Le t\u00e9l\u00e9phone a \u00e9t\u00e9 enti\u00e8rement r\u00e9assembl\u00e9.<\/li>\n\n\n\n<li>Toutes les fonctions sont pass\u00e9es - <strong>iPhone 12 enti\u00e8rement restaur\u00e9 !<\/strong><\/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\/iPhone_12_Cannot_Boot.png\" alt=\"L&#039;iPhone 12 ne d\u00e9marre pas\" title=\"\"><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Outils et liste de pi\u00e8ces<\/h2>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center has-cyan-bluish-gray-background-color has-background 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><strong>Outils :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Alimentation en courant continu<\/li>\n\n\n\n<li>Plate-forme de chauffage<\/li>\n\n\n\n<li>Microscope<\/li>\n\n\n\n<li>Pistolet \u00e0 air chaud<\/li>\n\n\n\n<li>Couteau \u00e0 sculpter<\/li>\n\n\n\n<li>Couteau \u00e0 lame<\/li>\n\n\n\n<li>Dispositif de test de la carte m\u00e8re en couches<\/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<p><strong>Pi\u00e8ces d\u00e9tach\u00e9es :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Carte logique du donneur de l'iPhone 12<\/li>\n\n\n\n<li>Carte de signalisation de remplacement<\/li>\n\n\n\n<li>Logique EEPROM<\/li>\n\n\n\n<li>Puce NAND<\/li>\n\n\n\n<li>UNIT\u00c9 CENTRALE<\/li>\n\n\n\n<li>Puce Wi-Fi<\/li>\n\n\n\n<li>Unit\u00e9 centrale de bande de base<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion :<\/h2>\n\n\n\n<p>S\u00e9v\u00e8re <a href=\"https:\/\/rewa.tech\/fr\/iphone-12-pro-drop-damage-cannot-boot-issue-repair\/\" data-type=\"post\" data-id=\"13109\">dommages dus \u00e0 la chute<\/a> ne signifie pas toujours que votre iPhone 12 est irr\u00e9cup\u00e9rable. S'il ne d\u00e9marre pas et affiche un courant de 70 mA, une carte d\u00e9form\u00e9e ou une d\u00e9faillance NAND\/CPU est probable. Gr\u00e2ce \u00e0 une inspection minutieuse, \u00e0 des greffes de puces crypt\u00e9es et \u00e0 l'utilisation de cartes de donneurs, un technicien comp\u00e9tent peut redonner vie \u00e0 un t\u00e9l\u00e9phone apparemment mort.<\/p>\n\n\n\n<p>Vous avez des questions ? Laissez un commentaire ou partagez votre histoire de r\u00e9paration d'iPhone 12 la plus difficile ci-dessous !<\/p>","protected":false},"excerpt":{"rendered":"<p>When an iPhone 12 experiences a severe drop, it&#8217;s not just the screen or back glass that suffers\u2014internal logic board components can also sustain serious damage. If your iPhone 12 won\u2019t boot and only shows a fixed current of around 70mA on a DC power supply, this guide details a real-world board-level repair case. We\u2019ll [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":13120,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[16,1485,13,158,447],"tags":[21,61,153],"class_list":["post-13119","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-case-study","category-how-to","category-iphone-guide","category-troubleshooting","tag-iphone","tag-iphone-12","tag-phone-repair"],"_links":{"self":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/13119","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=13119"}],"version-history":[{"count":0,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/13119\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media\/13120"}],"wp:attachment":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media?parent=13119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/categories?post=13119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/tags?post=13119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}