{"id":12999,"date":"2021-12-06T20:35:00","date_gmt":"2021-12-06T12:35:00","guid":{"rendered":"https:\/\/rewa.tech\/iphone-backlight-issue-repair-process\/"},"modified":"2024-05-10T15:24:57","modified_gmt":"2024-05-10T07:24:57","slug":"reparation-du-probleme-de-retroeclairage-de-liphone","status":"publish","type":"post","link":"https:\/\/rewa.tech\/fr\/iphone-backlight-issue-repair-process\/","title":{"rendered":"Processus de r\u00e9paration du probl\u00e8me de r\u00e9tro\u00e9clairage de l'iPhone"},"content":{"rendered":"<p>For the iPhone series, below models with backlight integrate with screen.<\/p>\n<ul>\n<li>iPhone 6 series (6\/6P)<\/li>\n<li>iPhone 6s series (6s\/6sP)<\/li>\n<li>iPhone 7 series (7\/7P)<\/li>\n<li>iPhone 8 series (8\/8P)<\/li>\n<li>iPhone XR<\/li>\n<li>iPhone 11<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/Backlight.jpg\" alt=\"Backlight Structure\" width=\"650\" height=\"308\" title=\"\"><\/p>\n<p>(* the earlier models will not be introduced here)<\/p>\n<\/p>\n<p>In this article\uff0clet&#8217;s share the basic repair process of the backlight issues like no backlight, half bright half dim, etc.<\/p>\n<\/p>\n<p><strong>First, replace another screen to exclude the possibility caused by the accessories.&nbsp;<\/strong><\/p>\n<p><strong><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/7_Screen.png\" alt=\"\" title=\"\"><\/strong><\/p>\n<p>Be careful when you do the screen replacement, do not damage the fingerprint button flex cable.<\/p>\n<\/p>\n<p><strong>After that, if issue is still unresolved. Then check the cosmetic of the motherboard<\/strong><\/p>\n<ul style=\"list-style-type: circle;\">\n<li>Check the whole motherboard under the microscope carefully to see if there is any obvious damage like components missing, corrosive, moldy, burning, etc.<\/li>\n<li>Focu on checking the display connector, check the cosmetic of connector pins to see if there&#8217;s any corrosive or deformation.<\/li>\n<li>Check the screw driver hold, to see if the motherboard get overly long screw damage sign<\/li>\n<\/ul>\n<p>If find any abnormal, deal with the abnormal components first.&nbsp;<\/p>\n<p>Can clean the PCB with PCB cleaner and brush slightly and carefully, but the ultrasonic machine cleaning is not recommended.<\/p>\n<\/p>\n<p><strong>Thirdly, check the diode values on the display connector. <\/strong><\/p>\n<p>Especially the pins which related with the backlight function.<\/p>\n<ul style=\"list-style-type: circle;\">\n<li>For iPhone 6\/6s\/7\/8, there are 3 backlight related signal rails<\/li>\n<li>For iPhone 6P\/6sP\/7P\/8P\/XR\/, there are 3 backlight related signal rails<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/Backlight_6s.png\" alt=\"\" title=\"\"><\/p>\n<p>[ iPhone 6s display connector, there&#8217;re 3 rails related to the backlight function. ]<\/p>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/Backlight_6sP.png\" alt=\"\" title=\"\"><\/p>\n<\/p>\n<p>[ iPhone 6sP display connector, there&#8217;re 6 rails related to the backlight function. ]<\/p>\n<\/p>\n<p>Measure the diode values of the backlight function related pins.<\/p>\n<ul style=\"list-style-type: circle;\">\n<li>If the diode value is much more higher than the reference diode value, might be the resistor on the rail open or inner rail broken<\/li>\n<li>If the If the diode value is zero or much more lower than the reference diode value. It might be capacitor get shorted or chip damaged.<\/li>\n<\/ul>\n<p>Track the abormal pin related rail, find out and replace the abnormal components with new ones.<\/p>\n<\/p>\n<p><strong>Step 4, if the diode values are OK. Or after the step 3, the issue is still unresolved.<\/strong><\/p>\n<p><strong>Then we should check the backlight related diode IC<\/strong><\/p>\n<\/p>\n<p>Let&#8217;s take the iPhone 7 as an example to see the details.<\/p>\n<p>Refer to the block diagram from&nbsp;<a href=\"https:\/\/refoxteam.com\/\" target=\"_blank\" rel=\"noopener\">Refox bitmap<\/a>, to check the backlight boost\/driver IC number and the locations on the motherboard.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/display_And_backligt_issue.png\" alt=\"iPhone Backlight Issue\" width=\"792\" height=\"487\" title=\"\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/rewa.tech\/wp-content\/uploads\/2024\/04\/Backlight_Driver_IC.png\" width=\"969\" height=\"658\" alt=\"\" title=\"\"><\/p>\n<p>After that, just track schematic\/block diagram again. We can easliy find out the diode tube.<\/p>\n<p>iPhone 7 display circuit related diode tubes are D3701 and D3702.<\/p>\n<p>As the diode test pin is hard to touch<\/p>\n<ul style=\"list-style-type: circle;\">\n<li>I. We can find the pin connector components to measure<\/li>\n<li>II. Test with multimeter for two times. First time put the BLK\/RED probes on the both sides, second time reverse the two probes. <span style=\"color: #008000;\">If measure result is one time around 200, another time infinate, indicate the diode tube is OK.<\/span><\/li>\n<\/ul>\n<\/p>\n<p><strong>Step 5. If the diode compnents are OK and issue stay unresolved.<\/strong><\/p>\n<p><strong>The we just go to the Backlight driver IC directly.<\/strong><\/p>\n<p>Remove the backlight driver IC, then measure the diode values on the pads.<\/p>\n<ul style=\"list-style-type: circle;\">\n<li>If find any pin diode value is abnormal, track the pad related rail. To find out and replace the abnormal components<\/li>\n<li>If all the diode values are OK. Then replace the backlight driver IC directly.<\/li>\n<\/ul>\n<\/p>\n<p><strong>Tip<\/strong><\/p>\n<p>Based on the repair experience, if the backlight brightness can not be adjusted. Then we can also first go to the backlight boost IC. To replace it with a new one to have a try first.<\/p>\n<\/p>\n<p>OK, so this is the introduction for the iphone backlight issue repair process.<\/p>\n<p>To know the more detailed working process, troubleshooting process, repair cases, etc. You can join the <a href=\"https:\/\/academy.rewa.tech\/\">REWA academy<\/a> to learn.<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>For the iPhone series, below models with backlight integrate with screen. iPhone 6 series (6\/6P) iPhone 6s series (6s\/6sP) iPhone 7 series (7\/7P) iPhone 8 series (8\/8P) iPhone XR iPhone 11 (* the earlier models will not be introduced here) In this article\uff0clet&#8217;s share the basic repair process of the backlight issues like no backlight, [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":13000,"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-12999","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-iphone-repair-cases"],"_links":{"self":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/12999","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=12999"}],"version-history":[{"count":0,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/12999\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media\/13000"}],"wp:attachment":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media?parent=12999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/categories?post=12999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/tags?post=12999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}