{"id":2186,"date":"2020-05-22T00:00:00","date_gmt":"2020-05-22T00:00:00","guid":{"rendered":"http:\/\/192.168.2.19:8666\/?p=1"},"modified":"2023-11-07T19:01:50","modified_gmt":"2023-11-07T11:01:50","slug":"macbook-air-2015-no-backlight-repair","status":"publish","type":"post","link":"https:\/\/rewa.tech\/fr\/macbook-air-2015-no-backlight-repair\/","title":{"rendered":"R\u00e9paration du MacBook Air 2015 sans r\u00e9tro\u00e9clairage"},"content":{"rendered":"<p style=\"line-height: 1.7;\">Typically with MacBook Air no backlight problem, the first thing to check is the backlight IC. However, this time we are treating one repair case that is much more complicated. The No Backlight issue is caused by damage of booster diode. Check our blog and see how we confirm the fault by measurement and diagnosis.<\/p>\n<h2 style=\"line-height: 1.7;\"><strong>Disassemble MacBook<\/strong><\/h2>\n<p style=\"line-height: 1.7;\">Power on. MacBook goes with\u00a0dark screen.\u00a0User login interface can be dimly seen.<\/p>\n<p style=\"line-height: 1.7;\">Remove the lower case\u00a0and disconnect the battery. Remove the SSD module. Detach\u00a0the logic board.\u00a0Detach IO Board as well. Then connect the IO board to the logic board. Confirm the board number of logic board. Detach\u00a0the display. Then connect the display\u00a0with logic board. Switch the Multimeter to diode\u00a0mode.\u00a0Roll out the maintenance drawing and bitmap.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/22618462-cd61-445f-af6a-f22459513b60-macbook-air-no-backlight-repair-1.jpg\" alt=\"R\u00e9paration du MacBook Air 2015 sans r\u00e9tro\u00e9clairage\" title=\"\"><\/p>\n<h2 style=\"line-height: 1.7;\"><strong>Run Measurement<\/strong><\/h2>\n<p style=\"line-height: 1.7;\">Locate LCD connector J8300. Check PPHV_S0SW_LCDBKLT. Check\u00a0relevant circuit\u00a0of PPHV_S0SW_LCDBKLT. Locate inductor L7701\u00a0with maintenance drawing. Measure\u00a0resistance\u00a0of L7701. Measured resistance value is 414, normal value.<br \/>\n<img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/b4b7a4f0-b139-4a80-a058-7f4a9b1c956d-macbook-air-no-backlight-repair-2.jpg\" alt=\"R\u00e9paration du MacBook Air 2015 sans r\u00e9tro\u00e9clairage\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Switch to voltage mode. Plug in AC adapter\u00a0and measure the voltage of L7701. The measured voltage value is 8V5. Abnormal voltage value. Normal voltage value should be 25V or so.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/a2719d7f-2d37-4003-99ec-50266c2fa333-macbook-air-no-backlight-repair-3.jpg\" alt=\"Switch to voltage mode. Plug in AC adapter and measure the voltage of L7701. The measured voltage value is 8V5. Abnormal voltage value. Normal voltage value should be 25V or so.\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Disconnect the power\u00a0supply. Disconnect\u00a0the display\u00a0from\u00a0logic board. Roll out the drawing and confirm the working condition of IC\u00a0U7701. Locate IC U7701 with bitmap. Locate capacitor C7710\u00a0with bitmap. C7710\u00a0is connected with U7710 power supply VIN Pin.<br \/>\n<img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/6aeaf54b-fb99-4377-87bb-1b15e80028ef-macbook-air-no-backlight-repair-4.jpg\" alt=\"Roll out the drawing and confirm the working condition of IC U7701. Locate IC U7701 with bitmap. Locate capacitor C7710 with bitmap. C7710 is connected with U7710 power supply VIN Pin.\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Switch to resistance mode. Measure the resistance of C7710. Measured resistance value is 428, normal value. Switch to voltage mode. Plug in AC adapter\u00a0and measure the voltage of C7710. The measured voltage value is 5V, normal value.<\/p>\n<p style=\"line-height: 1.7;\">Locate C7711 with bitmap. C7711 is connected with VDDIO\u00a0Pin. Measure the voltage of C7711. The measured voltage value is 3V3, normal value. Confirm EN Pins of U7701 with maintenance drawing. Locate R7731\u00a0and R7715\u00a0with bitmap.<\/p>\n<p style=\"line-height: 1.7;\">Warm tips: voltage of EN Pins can be measured with display connected.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/844f83fb-d036-426b-9f55-4f24383194dd-macbook-air-no-backlight-repair-5.jpg\" alt=\"R\u00e9paration du MacBook Air 2015 sans r\u00e9tro\u00e9clairage\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Connect the display with logic board. Plug in AC adapter\u00a0and measure the voltage of R7731.\u00a0Voltage value of first Pin is 8V5, second Pin 2V8. Normal value.<\/p>\n<p style=\"line-height: 1.7;\">Warm tips: voltage value of EN Pins can be read on the meter with display on.<\/p>\n<p style=\"line-height: 1.7;\">Confirm PWM Pin\u00a0of U7701 with maintenance drawing. Locate R7704 with bitmap. Measure the voltage of R7704. The measured voltage value is 3V3, normal value.<\/p>\n<p style=\"line-height: 1.7;\">Confirm SCLK Pin\u00a0of U7701 with maintenance drawing. Locate R7753 with bitmap. Measure the voltage of R7753. The measured voltage value is 3V3, normal value.<\/p>\n<p style=\"line-height: 1.7;\">Confirm SDA Pin\u00a0of U7701 with maintenance drawing. Locate R7757 with bitmap. Measure the voltage of R7757. The measured voltage value is 3V3, normal value.<\/p>\n<p style=\"line-height: 1.7;\">Preliminary judgement &#8211; U7701 broke down<\/p>\n<h2 style=\"line-height: 1.7;\"><strong>Replace U7701<\/strong><\/h2>\n<p style=\"line-height: 1.7;\">Disconnect the power\u00a0supply. Reballing the new U7701\u00a0first. Take down the damaged U7701. Then replace with the new U7701. Solder with Hot Air Gun at 430\u2103.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/7f2d7598-02e7-48ff-819a-95dfbd9fee34-macbook-air-no-backlight-repair-6.jpg\" alt=\"Replace U7701\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Wait for the logic board to cool for 5 minutes. Confirm if soldering work has been completed perfectly with Magnifier. Clean with PCB Cleaner.Plug in AC adapter\u00a0and test if the fault has been cleared. The fault hasn\u2019t been cleared\u00a0with IC replaced.<\/p>\n<h2 style=\"line-height: 1.7;\"><strong>Replace D7701<\/strong><\/h2>\n<p style=\"line-height: 1.7;\">Connect the display with logic board. Confirm the relevant circuit\u00a0of PPHV_S0SW_LCDBKLT\u00a0with drawing. Locate booster diode\u00a0D7701\u00a0with bitmap. Plug in AC adapter\u00a0and measure voltage at two ends of D7701. Measured voltage value of End A is 8V5, End K 2V9. Abnormal voltage value for End K. Normal value should be 25V or so.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/d20c0478-d8bf-4e2b-9d60-99997e1f126c-macbook-air-no-backlight-repair-7.jpg\" alt=\"Replace D7701\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Disconnect the power supply. Disconnect\u00a0the display\u00a0from\u00a0logic board. Switch to diode mode. Measure resistance at Positive&amp;Negative ends of D7701. Forward direction\u00a0reads \u2018OL\u2019\u00a0on the meter, infinite value. Opposite direction reads 176 on the meter. Abnormal resistance value for D7701. We need to replace with a new D7701.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/858d6678-97e1-4b70-a9ff-f7098366c609-macbook-air-no-backlight-repair-8.jpg\" alt=\"Replace D7701\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Once replacing has been finished, wait for the logic board to cool for 5 minutes. Clean with PCB Cleaner. Measure resistance\u00a0of the new D7701. Forward direction\u00a0reads 166, normal value. Opposite direction reads \u2018OL\u2019\u00a0on the meter, normal value.<\/p>\n<p style=\"line-height: 1.7;\">Measure the resistance between D7701 and grounding. Measured value of End A is 388, End K 531. Normal value for the two ends.<\/p>\n<h2 style=\"line-height: 1.7;\"><strong>Test<\/strong><\/h2>\n<p style=\"line-height: 1.7;\">Connect the display with logic board and test again.<\/p>\n<p style=\"line-height: 1.7;\">Tips: connect\u00a0with an external USB keyboard, press \u2018Alt\u2019\u00a0button to power on.<\/p>\n<p style=\"line-height: 1.7;\">The screen lights up. Switch to voltage mode. Measure voltage at two ends of D7701\u00a0again. Measured voltage value of End A is 8V5, End K 25V. Normal value for the two ends.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/e9a9b29c-26d3-4ace-a12d-2bc411fbabf0-macbook-air-no-backlight-repair-9.jpg\" alt=\"onnect the display with logic board and test again.\" title=\"\"><\/p>\n<h2 style=\"line-height: 1.7;\"><strong>Remontage et test<\/strong><\/h2>\n<p style=\"line-height: 1.7;\">Disconnect the power supply. Get the screen installed. Get the logic board mounted. Insert the SSD. Plug in AC adapter and test. MacBook goes with normal display.<\/p>\n<p style=\"line-height: 1.7;\"><img decoding=\"async\" src=\"https:\/\/s.rewa.tech\/image\/75088bda-56cd-4889-8246-efc6b61e7c06-macbook-air-no-backlight-repair-10.jpg\" alt=\"Remontage et test\" title=\"\"><\/p>\n<p style=\"line-height: 1.7;\">Disconnect the power supply and power off. Get the MacBook full assembled. Run keyboard test and touch test. Repairing completed successfully.<\/p>\n<p style=\"line-height: 1.7;\">For detailed operation about MacBook repair, you can also check out <span style=\"color: #0000ff;\">\u00a0<\/span> <a style=\"color: #0000ff;\" href=\"https:\/\/www.youtube.com\/channel\/UC3ByF8DcZ3yxUs7VP1NOuyA\" target=\"_blank\" rel=\"noopener\"> Cha\u00eene YouTube de REWA<\/a> .<\/p>\n<p><iframe class=\"ql-video\" src=\"https:\/\/www.youtube.com\/embed\/-7_paJiwMO8?showinfo=0\" width=\"807\" height=\"403.5\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-blot-formatter-unclickable-bound=\"true\"><\/iframe><\/p>\n<p style=\"line-height: 1.7;\"><strong>Acad\u00e9mie REWA<\/strong><\/p>\n<p style=\"line-height: 1.7;\">For more tutorials, guides, and premium courses, visit <a href=\"https:\/\/academy.rewa.tech\">Acad\u00e9mie REWA<\/a>, a platform that encourages the sharing of repair techniques, practical demonstrations, and ideas among electronics repair practitioners. We have developed a number of online and offline repair training courses over the years with the assistance of our teaching staff and R&amp;D team.<\/p>\n<p style=\"line-height: 1.7;\">","protected":false},"excerpt":{"rendered":"<p>G\u00e9n\u00e9ralement, en cas de probl\u00e8me de r\u00e9tro\u00e9clairage du MacBook Air, la premi\u00e8re chose \u00e0 v\u00e9rifier est le circuit int\u00e9gr\u00e9 du r\u00e9tro\u00e9clairage. Cependant, cette fois-ci, nous traitons un cas de r\u00e9paration qui est beaucoup plus compliqu\u00e9. Le probl\u00e8me d'absence de r\u00e9tro\u00e9clairage est d\u00fb \u00e0 la d\u00e9t\u00e9rioration de la diode d'amplification. Consultez notre blog et voyez comment nous confirmons le probl\u00e8me par des mesures et un diagnostic.<\/p>","protected":false},"author":1,"featured_media":2733,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/s.rewa.tech\/image\/9c6f3bdd-2ae8-48dc-b27a-f07ebf79f91b-banner-2.jpg","fifu_image_alt":"","footnotes":""},"categories":[17,5],"tags":[484,24],"class_list":["post-2186","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-macbook","category-guide","tag-backlight","tag-macbook"],"_links":{"self":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/2186","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/comments?post=2186"}],"version-history":[{"count":0,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/posts\/2186\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media\/2733"}],"wp:attachment":[{"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/media?parent=2186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/categories?post=2186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rewa.tech\/fr\/wp-json\/wp\/v2\/tags?post=2186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}