{"id":13209,"date":"2022-07-18T19:29:00","date_gmt":"2022-07-18T11:29:00","guid":{"rendered":"https:\/\/rewa.tech\/huawei-mate-20-pro-does-not-boot-issue-repair\/"},"modified":"2024-09-20T10:18:21","modified_gmt":"2024-09-20T02:18:21","slug":"huawei-mate-20-pro-boot-issues","status":"publish","type":"post","link":"https:\/\/rewa.tech\/fr\/huawei-mate-20-pro-boot-issues\/","title":{"rendered":"R\u00e9solution des probl\u00e8mes de d\u00e9marrage du HUAWEI Mate 20 Pro caus\u00e9s par des probl\u00e8mes de soudure du CPU"},"content":{"rendered":"<p>Le <a href=\"https:\/\/rewa.tech\/fr\/categorie\/guide\/huawei\/\">HUAWEI<\/a> Mate 20 Pro is a powerful device, but improper charging habits or environmental factors can lead to serious hardware issues. In this case, the phone was charged overnight and placed under a pillow, only to fail to boot the next morning. A fixed current reading during testing suggests that the CPU\u2019s connection to the PCB may be compromised. Thankfully, this is a repairable issue.<\/p>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile is-image-fill\"><figure class=\"wp-block-media-text__media\" style=\"background-image:url(https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/HUAWEi_Mate_20_Pro.png);background-position:50% 0%\"><img fetchpriority=\"high\" decoding=\"async\" width=\"587\" height=\"835\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/HUAWEi_Mate_20_Pro.png\" alt=\"huawei mate 20 pro\" class=\"wp-image-15373 size-full\" title=\"\" srcset=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/HUAWEi_Mate_20_Pro.png 587w, https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/HUAWEi_Mate_20_Pro-211x300.png 211w\" sizes=\"(max-width: 587px) 100vw, 587px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<h3 class=\"wp-block-heading\">Devices Details<\/h3>\n\n\n\n<p><strong>Mod\u00e8le :<\/strong> HUAWEI Mate 20 Pro<\/p>\n\n\n\n<p><strong>Annonc\u00e9 :<\/strong>&nbsp;2018, October 16<\/p>\n<\/div><\/div>\n\n\n\n<p>This guide will show technicians and DIYers how to tackle poor CPU soldering\u2014an increasingly common issue in Android phones, especially with high-performance chips like the Kirin 980 in the Mate 20 Pro.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ph\u00e9nom\u00e8ne de d\u00e9faut<\/h2>\n\n\n\n<p>After charging the phone overnight, the device won\u2019t boot. Connecting it to a charging <a href=\"https:\/\/shop.rewa.tech\/detail\/digital-multimeter-ut58a-oem-new.html\">multim\u00e8tre<\/a> reveals a <strong>0mA current<\/strong>, confirming that the phone is not charging.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Troubleshooting Steps<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1: Disassemble the Phone<\/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<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/02__Then_protect_the_camera_with_sticker.png\" alt=\"huawei mate 20 pro boot issue\" style=\"aspect-ratio:1;object-fit:cover\" title=\"\"><\/figure>\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<ul class=\"wp-block-list\">\n<li>Begin by carefully disassembling the phone. Protect the camera lenses with stickers, and remove the motherboard.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2: Test Boot Current<\/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<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/03__Connect_the_motherboard_with_DC_power_supply_and_try_to_trigger_the_boot_process_to_check_the_boot_current.png\" alt=\"multim\u00e8tre\" title=\"\"><\/figure>\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>Connecter la carte m\u00e8re \u00e0 un <a href=\"https:\/\/shop.rewa.tech\/detail\/sugon-3005pm-dc-power-supply.html\">Alimentation en courant continu<\/a> and attempt to trigger the boot process. The current is fixed at <strong>97mA<\/strong>, indicating the phone cannot boot. Based on repair experience, this can be caused by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CPU overheating, leading to poor soldering between the CPU and the PCB.<\/li>\n\n\n\n<li>A broken inner PCB rail, disrupting the connection between the CPU and related circuits.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p>Since the phone has no signs of water damage or physical drops, the most likely cause is <strong>CPU poor soldering<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Repair Huawei Mate 20 Pro Won&#8217;t Turn On<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1: Remove the CPU<\/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<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\/04__First__remove_the_shielding_cover.png\" alt=\"kirin 980 cpu\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/05__remove_the_glue_around_the_CPU_chip.png\" alt=\"kirin 980 cpu\" title=\"\"><\/figure>\n<\/figure>\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<ul class=\"wp-block-list\">\n<li>First, remove the shielding cover to access the <strong>Kirin 980 CPU<\/strong>.<\/li>\n\n\n\n<li>The Kirin 980 is prone to poor soldering, so we need to rework it. Start by removing the glue surrounding the CPU chip using a <strong><a href=\"https:\/\/shop.rewa.tech\/detail\/sugon-2020d-hot-air-gun.html\">pistolet \u00e0 air chaud<\/a><\/strong> fix\u00e9 \u00e0 <strong>290\u00b0C<\/strong>. Be cautious not to overheat any specific area.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2: Disassemble the CPU Layers<\/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<figure class=\"wp-block-gallery has-nested-images columns-2 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\/06__Remove_the_RAM_layers.png\" alt=\"remove kirin 980 cpu\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/07__Separate_the_first_layer_of_the_CPU.png\" alt=\"remove kirin 980 cpu\" title=\"\"><\/figure>\n<\/figure>\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>The CPU is composed of two layers: the <strong>upper RAM layer<\/strong> and the <strong>lower core CPU layer<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove the upper RAM layer first.<\/li>\n\n\n\n<li>Next, slightly heat the lower CPU layer until the solder melts, and carefully pry it up from the PCB.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">3: Inspect the PCB Pads<\/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<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/08__Heat_the_lower_layer_of_the_CPU_slightly__then_when_feel_the_tins_on_the_PCB_melt__pry_up_the_core_CPU_chip_slightly.png\" alt=\"inspecting huawei mate 20 pro pcb\" title=\"\"><\/figure>\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<ul class=\"wp-block-list\">\n<li>After removing the CPU, inspect the PCB. Some pads may have turned <strong>black<\/strong> due to corrosion, leading to poor connections.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">4: Clean and Reball the CPU<\/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<figure class=\"wp-block-gallery has-nested-images columns-2 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\/09__As_we_can_see_there_are_some_pads_on_the_PCB_turned_into_black_color.png\" alt=\"clean pcb pads\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/10__remove_the_black_glues.png\" alt=\"remove excess solder\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/11__The_black_glues_in_the_corner.png\" alt=\"remord black glue\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/12__Remove_the_black_glue_first.png\" alt=\"pads are spotless\" title=\"\"><\/figure>\n<\/figure>\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<ul class=\"wp-block-list\">\n<li>Clean the PCB pads using <a href=\"https:\/\/shop.rewa.tech\/detail\/halogen-free-solder-paste-flux-my-up-78a.html\">flux de p\u00e2te \u00e0 souder<\/a>, a <a href=\"https:\/\/shop.rewa.tech\/detail\/portable-hot-air-soldering-gun.html\">pistolet \u00e0 air chaud<\/a>et un <a href=\"https:\/\/shop.rewa.tech\/detail\/sugon-t26d-smd-soldering-iron-station.html\">fer \u00e0 souder<\/a>. Use solder wick to remove excess solder and ensure the pads are flat.<\/li>\n\n\n\n<li>Carefully remove the hard <strong>black glue<\/strong> from the PCB, especially around the corners, under a microscope. Ensure the pads are spotless and flat to ensure proper CPU re-soldering.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">5: Reball the CPU Chips<\/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<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/13__Soldering.png\" alt=\"reballing cpu\" title=\"\"><\/figure>\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<ul class=\"wp-block-list\">\n<li>Reball the CPU\u2019s upper and lower layers using a <a href=\"https:\/\/shop.rewa.tech\/detail\/dot-projector-flood-illuminator-aml-sensor-charging-board-true-tone-reballing-stencil-wl-02-oem-new.html\">pochoir<\/a>. Be patient, as this process requires precision.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">6: Resolder the CPU<\/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<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-4 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\/14__Reball_the_first_layer_of_the_CPU.png\" alt=\"lower cpu layer\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/15__Resolder_the_RAM.png\" alt=\"huawei cpu\" title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/HUAWEI_Mate_20_Pro_Does_Not_Boot.png\" alt=\"huawei mate 20 pro boot issue\" title=\"\"><\/figure>\n<\/figure>\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<ul class=\"wp-block-list\">\n<li>Align the <strong>lower CPU layer<\/strong> with the cleaned PCB and reflow the solder using the hot air gun. Heat the board evenly until the solder melts, allowing the CPU to seat itself onto the PCB.<\/li>\n\n\n\n<li>Afterward, resolder the <strong>upper RAM layer<\/strong> using a similar method.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">7: Reassemble and Test<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reassemble the phone and test it. The phone should now boot normally, and charging, along with other functions, should work perfectly.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion :<\/h2>\n\n\n\n<p><strong>CPU poor soldering<\/strong> is a frequent issue in Android devices, and the Kirin 980 in the HUAWEI Mate 20 Pro is no exception. By carefully removing, cleaning, and resoldering the CPU, Huawei Mate 20 Pro boot issue can be successfully resolved. Proper handling and repair skills, especially in CPU rework, can fix up to 90% of boot issues caused by soldering problems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conseils de pr\u00e9vention<\/h2>\n\n\n\n<p>To avoid future soldering issues caused by overheating or improper charging:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1: Adopt Better Charging Habits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Avoid using the phone while it\u2019s charging.<\/li>\n\n\n\n<li>Use a certified charger and USB cable.<\/li>\n\n\n\n<li>Charge the phone in a well-ventilated, cool area.<\/li>\n\n\n\n<li>Try to keep the battery between <strong>30% and 90%<\/strong> rather than allowing it to drop to 0% or charge fully to 100%.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2: Avoid Overnight Charging<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Charging the phone overnight, especially under a pillow or in hot environments, can contribute to CPU overheating, which may weaken solder joints.<\/li>\n<\/ul>\n\n\n\n<p>By following this step-by-step guide, you can resolve most <strong>HUAWEI Mate 20 Pro boot issues<\/strong> caused by poor CPU soldering. This comprehensive solution can help you avoid unnecessary motherboard replacements, saving both time and money. If you have any questions or need further assistance, feel free to leave a comment below!<\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>","protected":false},"excerpt":{"rendered":"<p>The HUAWEI Mate 20 Pro is a powerful device, but improper charging habits or environmental factors can lead to serious hardware issues. In this case, the phone was charged overnight and placed under a pillow, only to fail to boot the next morning. A fixed current reading during testing suggests that the CPU\u2019s connection to [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":13210,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[166,10,5],"tags":[704,167],"class_list":["post-13209","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-huawei","category-android","category-guide","tag-huawei","tag-huawei-mate-20"],"_links":{"self":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/13209","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=13209"}],"version-history":[{"count":0,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/13209\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media\/13210"}],"wp:attachment":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media?parent=13209"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/categories?post=13209"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/tags?post=13209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}