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TRAIN

學習資料

iPhone 7plus 無緣無故不顯示維修思路

iPhone 7plus 無緣無故不顯示

今天講一個非常簡單，撿錢的故障。這故障還頻繁出現在6S 6sp 7上面，根據客戶描述，無摔，無進水，突然就這樣了

接下來檢查了一下，按側面靜聲鍵，有震動反饋，電話都還能得通。初步判斷，手機開機正常，顯示部分故障。

拆機排除顯示屏后，留意到開機電流會偏大

檢查主板顯示座周邊，非常漂亮，沒有燒或者電容擊穿的痕跡。

按慣例先測試對地回路值，再測電壓

查到顯示座 20角，阻值不正常，原本應該是486的數值，如今卻是0，行內稱“下地了”

繼續查發現這是顯示屏5.7V主供電，毫無疑問了，接下來查這一組的周邊濾波電容就可以不了

然后單獨給這組線路，外掛供電，接一條0-5.7V的電進去,從來低電壓慢慢調高,看電流越來越大,不能超過承受的最大值,然后留意松香部分,那個電容上面的松香融化

罪魁禍首找到了. 一個小小電容擊穿了,導致顯示部分故障. 無緣無故不顯示很多時候就是這組5.7V主供電”下地”導致的

裝機一切正常！如果想學習請加我微信1375382060黃老師

。

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最近中文字幕2019视频1