Replacement of the power button on Xiaomi Redmi Note 7: a complete guide with photos and tips

The power button on the Xiaomi Redmi Note 7 is one of the most vulnerable parts of the smartphone. Over time, it starts to jag, stops working at the first press or completely fails, leaving the device “dead” in appearance, but working inside. If you encounter this problem, do not rush to carry the phone into the service: you can do the replacement yourself, saving up to 70% of the cost of repair.

In this article, we will discuss the entire process from fault diagnosis to final assembly, including choosing a quality button, disassembling the case without damage and soldering contacts (if necessary).

Importantly, if the button doesn't work after a drop or moisture hits, the problem may not be in the key itself, but in the power controller on the board, in which case replacing the button won't help, you'll need a diagnostic at the service center, and we'll tell you how to distinguish a mechanical failure from an electronic one.

Signs of failure of the switch

Before you disassemble your smartphone, make sure that the problem is in the button.

• 🔘 The button is not pressed or pressed with force (often accompanied by a creak).
• 🔄 Smartphone turns on / off spontaneously - a sign of "sticking" contacts.
• ⚡ The button only works when pressed in a certain place (for example, on the edge).
• 🔋 The phone does not respond to charging (the indicator does not light up), but when connected to a PC it is defined as Qualcomm 9008 – this may indicate damage to the button plume.

If the smartphone doesn't turn on completely, try a forced reboot: press the power button + increase the volume for 10-15 seconds. If there is no reaction, plug the charger in for 30 minutes - sometimes the battery discharges to a level at which the phone does not show signs of life.

⚠️ Attention: If after a fall the smartphone does not turn on, and when connected to charging, you feel the smell of burning or the body heats up in the processor area - DO NOT disassemble it yourself.

Replacement tools and materials

You will need to work:

When selecting a button, pay attention to the article. For the Redmi Note 7 (model) M1901F7G) The Xiaomi Original Power Button Flex Cable is a good part. Avoid too cheap options (below 150). ₽) — They often break down after 1-2 months.

Step-by-step instructions for dismantling a smartphone

Disassembling the Redmi Note 7 requires care — the body is glued together and the plumes are brittle.

1. Turn off the phone and remove it. SIM-cardboard.
2. Heat the back cover with a hair dryer (temperature 60-70 ° C) around the perimeter for 2-3 minutes - this will soften the glue.
3. Insert a plastic blade into the gap between the body and the screen (start at the lower right corner) and gently lead along the edge.
4. Unscrew 12 screws with a PH00 cross screwdriver (don’t confuse them with places – they are of different lengths!).
5. Disconnect the battery plume (it is under a black protective film).

Now you can get to the power button, and it's on a separate, flexible plume that's attached to the motherboard with a small connector to disconnect it.

• 🔧 Put the tweezers on the side (Do not pull the plume!).
• 🔍 Check if there is dirt or oxidation under the button - sometimes it is enough to clean the contacts with alcohol.
• 🛠️ If the button on the plume is damaged, carefully solder it with a soldering iron (power not more than 30 W).

⚠️ Attention: If during disassembly you saw that the display plume is severed or there are black spots on the motherboard (stick) - further replacement of the button can aggravate the problem.

Installation of a new button and soldering (if necessary)

If you buy the most common case button, it will take 5 minutes to install:

1. Compare the new part with the old one – the connectors must match.
2. Insert the plume into the connector on the motherboard before clicking.
3. Secure the plume with tape (comes complete with the button) so that it does not fall out during assembly.

If the button is soldered to the board (rarely, but it happens in some versions of the Redmi Note 7), act as follows:

1. Apply the flux to the contacts of the old button.
2. Heat the soldering iron and remove the button with tweezers.
3. Clear the contacts with alcohol.
4. Seal the new button with polarity (usually marked "+" and "-" on the board).

For soldering, use a roan tin and a soldering iron with a power of no more than 30 W. Overheating the board can disable the power controller or NFC module (if you have one in your model).

💡

Wrap the motherboard with foil before soldering, leaving only the button contacts open, which will protect it from accidental soldering.

Assembly of the phone and checking of performance

Collect your smartphone in reverse order, but take into account a few nuances:

• 🔩 Screw the screws cross-curl to avoid skewing the board.
• 📱 Before final assembly, plug in the battery and check if the phone is switched on.
• 🔋 If the smartphone does not respond, check the connection of the button plume and battery.

After assembly:

1. Turn on your phone and check the reaction to the press of the button.
2. Make sure the vibration and backlighting of the buttons are working (if they were before the repair).
3. Test Recovery mode (clip the power + increase the volume).

If the button is working, but the phone is spontaneously rebooting — you may have damaged the battery plume or missed the circuit board screws. Take the smartphone apart and check all connections.

💡

After changing the button, be sure to reset (Settings → Additional → Restore and Reset) if the phone is buggy. This will eliminate possible software errors associated with hardware changes.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing the button with the Redmi Note 7.

Another common problem is that the button works, but it doesn't turn on the phone.

• 🔌 Battery discharged (plug charging for 10 minutes).
• 🔧 The button plume is not connected to the end (disassemble and check).
• 🔥 Power controller damaged (requires diagnostics in the service).

Alternative ways to turn on your phone without a button

If the button is broken, and there is no new part at hand, you can temporarily use the smartphone using these methods:

• 🔌 Charging Connection: Some Redmi Note 7 models turn on automatically when connected to the network.
• 📱 ADB-commands: if on USB-Debugging, you can send a switch on command from the PC: adb shell input keyevent 26
• 🔄 Reboot via Recovery: Click Volume Increase + Power (sometimes even with a faulty button).

For permanent use without a button, you can install the Power Button to Volume Button app (root rights required) or connect it to the app. OTG-Keyboard cable – some models support Enter keyboard inclusion.

FAQ: Frequent questions about changing the button