{"id":1992,"date":"2017-10-19T00:00:00","date_gmt":"2017-10-19T00:00:00","guid":{"rendered":"http:\/\/192.168.2.19:8666\/?p=1"},"modified":"2023-12-15T18:10:41","modified_gmt":"2023-12-15T10:10:41","slug":"iphone-7-black-screen-repair-logic-board","status":"publish","type":"post","link":"https:\/\/rewa.tech\/it\/iphone-7-black-screen-repair-logic-board\/","title":{"rendered":"iPhone 7 Black Screen Repair &#8211; Logic Board Solution"},"content":{"rendered":"<p style=\"line-height: 1.7;\">iPhone 7 starts up with a black screen or no display, yet the boot current is normal. Screen replacing also cannot solve the problem. We can draw the conclusion that the logic board backlight circuit broke down. REWA offers a logic board solution regarding the iPhone 7 black screen issue (iPhone 7 home button not working).<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/6520e3df-897a-4aaf-b7fd-84bfe6f499f5-1-6.jpg\" alt=\"iPhone 7 Black Screen Repair - Logic Board Solution\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">iPhone 7 Black Screen Repair &#8211; Logic Board Solution Power key power up, the phone shows no response.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/8d7c1b30-a543-41f9-8d0e-1fd4f018d4ff-2-6.jpg\" alt=\"iPhone 7 Black Screen Repair - Logic Board Solution Power key power up, the phone shows no response. \" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Take apart the phone\u00a0and disconnect the battery. Connect the phone with the DC Power Supply. Booting current displays normally,\u00a0yet the phone goes with no display.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/50d56dce-a20e-439d-80ea-ca473379d794-3-5.jpg\" alt=\" Take apart the phone and disconnect the battery. Connect the phone with the DC Power Supply. Booting current displays normally, yet the phone goes with no display.\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Disconnect the power supply and detach the display assembly. Replace with a new display assembly. Connect the phone with the DC Power Supply\u00a0and power up. The phone still goes with no display<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/1b35e424-6dd7-48a4-8a1d-290576107bcb-4-3.jpg\" alt=\"Disconnect the power supply and detach the display assembly. Replace with a new display assembly. Connect the phone with the DC Power Supply and power up. The phone still goes with no display\" title=\"\"><\/p>\n<h2 style=\"line-height: 1.7;\">Preliminary judgment &#8211;\u00a0backlight circuit\u00a0of the logic board broke down<\/h2>\n<p style=\"line-height: 1.7;\">Take out the logic board. The test grounding resistance value of J4502\u00a0&#8211; normal value. Which shows that backlight circuit is also normal. Yet backlight signal is connected directly with backlight IC U3701.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/de5a6b9e-a0d8-4f37-8c5d-238767bc1dc2-5-3.jpg\" alt=\"Take out the logic board. The test grounding resistance value of J4502 - normal value. Which shows that backlight circuit is also normal. Yet backlight signal is connected directly with backlight IC U3701. \" title=\"\"><\/p>\n<h2 style=\"line-height: 1.7;\"><strong>Preliminary judgment\u00a0&#8211;<\/strong> retroilluminazione<strong> IC U3701 broke down<\/strong><\/h2>\n<p style=\"line-height: 1.7;\">Apply some BGA Paste Flux, take down the backlight IC with Hot Air Gun at 320 degrees.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/48109e53-1f3e-49ab-95bb-d0f9d0cee8ed-6-4.jpg\" alt=\"Apply some BGA Paste Flux, take down the backlight IC with Hot Air Gun at 320 degrees. \" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Clean the tins\u00a0with Soldering Iron and then clean again with PCB Cleaner.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/58ea897b-bda5-4487-8b10-9e9ba5ed16ec-7-3.jpg\" alt=\"Clean the tins with Soldering Iron and then clean again with PCB Cleaner\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Apply some BGA Paste Flux. Align the backlight\u00a0IC to the right place and solder\u00a0it with Hot Air Gun\u00a0at 320 degrees.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/86813ec0-8584-415a-a687-97a7bbaf39af-8-2.jpg\" alt=\"Apply some BGA Paste Flux. Align the backlight IC to the right place and solder it with Hot Air Gun at 320 degrees. \" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Once the logic board is cooling enough, clean it with PCB Cleaner.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/56594459-bd8c-4deb-bade-e0edd73c41d6-9-1.jpg\" alt=\"Once the logic board is cooling enough, clean it with PCB Cleaner.\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Assemble the phone and test. The phone boots normally with screen display\u2014fault cleared.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/4004c7dc-8aa1-4087-837f-d725683c1843-10-1.jpg\" alt=\"Assemble the phone and test. The phone boots normally with screen display\u2014fault cleared \" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">For more details on iPhone 7 Black Screen Repair guide, please go to\u00a0<a href=\"https:\/\/www.youtube.com\/channel\/UC3ByF8DcZ3yxUs7VP1NOuyA\" target=\"_blank\" rel=\"noopener\">Canale YouTube di REWA<\/a>.<\/p>\n<p><iframe class=\"ql-video\" src=\"https:\/\/www.youtube.com\/embed\/MSNZj71Y8gY?showinfo=0\" width=\"652\" height=\"326\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-blot-formatter-unclickable-bound=\"true\"><\/iframe><\/p>\n<p style=\"line-height: 1.7;\">Parti e strumenti necessari<\/p>\n<ul>\n<li style=\"line-height: 1.7;\"><span style=\"color: #0000ff;\">Programmatore di chip di memoria flash NAND PCIE<\/span><\/li>\n<li style=\"line-height: 1.7;\"><span style=\"color: #0000ff;\">256 GB NAND Flash Memory Chip \u2013 iPhone 7 Plus<\/span><\/li>\n<li style=\"line-height: 1.7;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.rewatechnology.com\/soldering-iron-rework-station-969a-15178.html\" target=\"_blank\" rel=\"noopener\">Saldatore<\/a> <span style=\"color: #0000ff;\">Pistola ad aria calda<\/span><\/li>\n<li style=\"line-height: 1.7;\"><span style=\"color: #0000ff;\">Flusso di pasta BGA<\/span><\/li>\n<li style=\"line-height: 1.7;\"><span style=\"color: #0000ff;\">Supporto per PCB<\/span><\/li>\n<li style=\"line-height: 1.7;\"><span style=\"color: #0000ff;\">Cinghia da polso antistatica<\/span><\/li>\n<li style=\"line-height: 1.7;\"><span style=\"color: #0000ff;\">Driver per viti<\/span><\/li>\n<li style=\"line-height: 1.7;\"><span style=\"color: #0000ff;\">LCD Opening Pliers\u00a0(M)<\/span><\/li>\n<li style=\"line-height: 1.7;\"><span style=\"color: #0000ff;\">Tweezers\u00a0(ESD \u2013 10 \/ ESD \u2013 15)<\/span><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>iPhone 7 starts up with a black screen or no display, yet the boot current is normal. Screen replacing also cannot solve the problem. We can draw the conclusion that the logic board backlight circuit broke down. REWA offers a logic board solution regarding the iPhone 7 black screen issue (iPhone 7 home button not [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2555,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/s.rewa.tech\/image\/5ad95af5-816d-4490-ac50-cae98edbff59-iPhone-7-Black-Screen-Repair.jpg","fifu_image_alt":"","footnotes":""},"categories":[5,158,447],"tags":[685,686,538],"class_list":["post-1992","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guide","category-iphone-guide","category-troubleshooting","tag-iphone-7-black-screen","tag-iphone-7-logic-board-repair","tag-iphone-7-repair"],"_links":{"self":[{"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/posts\/1992","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/comments?post=1992"}],"version-history":[{"count":0,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/posts\/1992\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/media\/2555"}],"wp:attachment":[{"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/media?parent=1992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/categories?post=1992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rewa.tech\/it\/wp-json\/wp\/v2\/tags?post=1992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}