Xiaomi Mi 4 Motherboard Replacement

简介

If you need to replace the motherboard of your Xiaomi Mi 4, follow this guide. To gain access to the motherboard, both the back of the device and the battery have to be removed. One should also maintain a hygienic environment and remain statically grounded for the duration of this fix.

你所需要的

步骤 1 Rear Case/Midframe

Xiaomi Mi 4 Motherboard Replacement, Rear Case/Midframe: 步骤 1 中的图像 1，3

Xiaomi Mi 4 Motherboard Replacement, Rear Case/Midframe: 步骤 1 中的图像 2，3

Xiaomi Mi 4 Motherboard Replacement, Rear Case/Midframe: 步骤 1 中的图像 3，3

Check to make sure that the device is powered off.
Use a pin or paper clip to insert in the hole on the side of the phone next to the micro SIM cardholder to remove the tray.
Remove the SIM card tray from the Xiaomi Mi 4 and store it somewhere safe.

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步骤 2

Xiaomi Mi 4 Motherboard Replacement: 步骤 2 中的图像 3，3

在这个步骤中使用的工具：

Metal Spudger

$2.99

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Using the flat metal spudger and curved metal spudger, make a wedge between the plastic back cover and the inner frame
Using the second spudger, slowly work your way around the perimeter of the device
Listen for clicking sounds as you are prying the back cover away from the frame
As the back cover is almost completely removed, use the suction-cup tool to remove the plastic cover without damaging the back

翻译

Heres a picture from the mi4 backcover

[URL=https://www.imagebanana.com/s/978/F9eUPw...][IMG]https://s1.imagebanana.com/file/180224/t...[/IMG][/URL]

mobbom - 2018年2月23日回复

步骤 3

Xiaomi Mi 4 Motherboard Replacement: 步骤 3 中的图像 3，3

Use a 000 phillips head screwdriver to remove the 10 1.2mm phillips head screws in the plastic frame that hold the motherboard and battery.
Use a 000 phillips head screwdriver to remove the 3 0.5mm phillips head screws in the plastic frame that hold the motherboard and battery.
Use the small plastic opening tool and place it in the slot on the bottom right corner of the inner frame and carefully pry it off.

翻译

I don't think it is necessary to remove the three 0.5mm screws. Note: the right-most orange circle should be placed instead of the red circle above the two larger orange circles - those are the 0.5mm screws which secures a small plate under the plastic cover which is in NOT physically (but electrically via two metal contacts) to the mainboard.

Douglas Ling - 2017年8月9日回复

yes, I expirienced the same thing. the three stated screws fixing a module (the flashlight LED-plate) on the frame..

mobbom - 2018年2月23日回复

步骤 4 Battery

Xiaomi Mi 4 Motherboard Replacement, Battery: 步骤 4 中的图像 1，3

Xiaomi Mi 4 Motherboard Replacement, Battery: 步骤 4 中的图像 2，3

Xiaomi Mi 4 Motherboard Replacement, Battery: 步骤 4 中的图像 3，3

Use tweezers to gently disconnect the connections that run across the battery and are connected to the motherboard.
Proceed to gently remove the tape like connector from the battery until it is completely off.
Use tweezer to disconnect battery’s wire from the motherboard.

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my mi4 had an accu Model “BM32” .. I ordered BM33 first. but the dimensions of the accu are different, so one can install only the right one.

mobbom - 2018年2月23日回复

步骤 5

Use the plastic opening tool to gently pry the battery out of its casing for removal.

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Using a Pry tool damaged a bit the casing of the battery. I ended up pulling the battery's plastic sticker to remove it (adhesive holding the battery in place)

James Burton - 2017年6月10日回复

Is it safe, can we fix the back cover perfectly?

Hemen Bhatt - 2018年12月30日回复

步骤 6 Motherboard

Xiaomi Mi 4 Motherboard Replacement, Motherboard: 步骤 6 中的图像 1，1

With the battery removed locate the left-hand cable connected to the motherboard. With the tweezers, firmly grasp the wires of the connector and gently disconnect the cable from the motherboard.
Find the other cable connecting the motherboard to the device at the top right-hand side of the phone, and carefully use the tweezers to remove that as well.

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