Replacement of the battery indicator on Xiaomi Redmi Note 8 Pro: a full review of the process

Xiaomi Redmi Note 8 Pro is one of the most popular mid-range smartphones, but even it has problems with the charging indicator over time. If your device stopped showing battery level, flashes incorrectly or does not respond at all to the connection of the charger, the reason may lie in a malfunction of the LED indicator or its contacts. In this article, we will discuss how to diagnose the problem and replace the battery indicator without contacting the service center.

The procedure requires precision and basic electronics skills, but with the right approach, it can be done at home. It is important to understand that the charging indicator on the Redmi Note 8 Pro is integrated into the motherboard through a flexible plume, so replacing it often involves working with trace elements, and we will look at all the steps from tool preparation to final testing.

Causes of failure of the charging indicator

Before you start repairing, you need to determine that the problem is in the indicator, and not in other components of the smartphone.

• 🔋 Mechanical damage – a phone drop could damage contacts or the LED itself.
• 💧 Moisture intake - oxidation of contacts on the board or plume of the indicator.
• ⚡ Voltage spikes – a faulty charger or cable can disable the indication circuit.
• 🛠️ Wear of components – over time, the LED or resistors in its chain degrade.

If the indicator stopped working after a fall or contact with water, it is likely that the problem is localized in it, but if the phone also does not charge or turns off when connecting to the network, the cause may be a malfunction of the power controller, in which case more complex repairs will be required.

⚠️ Attention: If the indicator is not working, but the phone is charging normally and displays the level of the battery in the system, the problem is most likely in the LED itself. If there is no charging at all, do not rush to change the indicator, first check the connector. USB-C cable.

Required tools and materials

To replace the battery indicator with the Redmi Note 8 Pro, you will need:

If you're not planning to solder, you can buy a trained indicator module that connects to the motherboard without soldering. However, these modules are less common and can cost more. For accurate diagnosis, you can also use a multimeter to check the integrity of the indicator chain.

Step-by-step instructions for disassembling Redmi Note 8 Pro

Disassembly of the smartphone is the most important step. Redmi Note 8 Pro has adhesive body, so you need to act carefully so as not to damage the plumes or the back cover itself.

1. Turn off the phone and remove the tray for SIM-Use a plastic blade to gently fit the lid on the bottom edge (near the connector). USB-C). Warm up the body with a hair dryer (temperature) ~60°C) - this will soften the glue.
2. Once the lid has been lifted slightly, move the shoulder blade along the edge, separating it from the body. Be careful - under the lid there are fingerprint plumes and the lid is a lid. NFC-antennae.
3. Unscrew all the screws holding the metal plate above the battery (use the PH00 screwdriver). Carefully remove the plate and disconnect the battery plume from the motherboard.
4. Unscrew the screws that hold the motherboard, and lift it on the right side (there are plume connectors), disconnect all the plumes, including the one that goes to the charging indicator.

At this point, you'll have access to the board where the indicator is located. SMD-LED (marking may differ, but often it is 0603 or 0805) with a resistor next to it. If the indicator is integrated into a flexible plume, it can be replaced entirely.

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Diagnostics of indicator malfunction

Before you change the indicator, make sure that it's the problem.

1. Connect your phone to the charger and check if the light is on. If not, move on to the next step.
2. With a multimeter in vertebrae mode, check the indicator circuit on the motherboard. One probe connects to the LED contact, the other to the ground (for example, to the metal housing of the USB-C connector). If the circuit is open, the problem is in the cliff.
3. Check the voltage on the indicator contacts when the charger is connected. It should be in the range of 2.8-3.3V. No voltage indicates a malfunction of the power controller.

If the LED doesn't light up, but the circuit and voltage are normal, it's likely that the LED element itself has failed, in which case it needs to be replaced, and if the problem is a track break or a resistor malfunction, soldering or replacing the board section may be necessary.

⚠️ Attention: Redmi Note 8 Pro boards often have a problem with the oxidation of contacts around the indicator. If you see a green or white plaque, clean it with alcohol solution and carefully seal the contacts with solder.

Replacement of the charging indicator: soldering vs. module

Depending on the nature of the malfunction and your skills, you can choose one of two replacement methods:

Method 1: Replace a separate LED (for experienced)

If the problem is with the LED, you can also solder it out and install a new one.

1. Heat the board around the LED with a hairdryer (temperature ~300°C) and remove it with tweezers.
2. Clear the contact areas of the old solder.
3. Install a new LED (note the polarity!) and solder it.

Method 2: Replacement of a flexible plume with an indicator (simple)

If the indicator is integrated into the plume (which is more common in the Redmi Note 8 Pro), just disconnect the old plume and connect a new one.

1. Carefully slap the latch of the plume connector on the motherboard.
2. Remove the old plume and insert a new one, making sure the contacts match.
3. Close the latch and check the performance.

Note: on some revisions of the boards Redmi Note 8 Pro, the charging indicator is soldered directly to the board without a connector. In this case, the replacement will require soldering, and without experience, it is better to contact the service.

Phone assembly and testing

After changing the indicator, you need to properly assemble the phone to avoid new problems.

1. Connect all the plumes to the motherboard (make sure that they are tightly fixed by the latches).
2. Put the board in place and twist the screws. Don't drag them over, it could damage the tracks.
3. Connect the battery plume and check if the phone is turning on. If so, install a metal plate and a back cover.
4. Glue the body around the perimeter with double-sided tape (you can use the remains of old glue or buy a new one in electronics stores).

After assembly, connect the phone to the charger and check:

• 🔴 Does the indicator burn when charging?
• 🟢 Does it change color (if it is maintained)?
• 📱 Whether charging is displayed in the system (Settings) → Battery)?

If the light is running, but the phone is warming or discharged quickly, it may have damaged the battery plume or contacts during assembly, in which case, disassemble the device again and check all connections.

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If the indicator flashes unstable after replacing, try updating the phone's firmware. Sometimes LED malfunctions are due to software errors of the power controller. Go to Settings → About Phone → System Update.

Frequent Mistakes and How to Avoid Them

Even with care, you can make mistakes that will lead to new faults, and here are the most common ones:

• 🔥 Overheating of the board - if you heat the board too long with a hairdryer, you can damage nearby components.°C and heat with short pulses.
• ⚡ Improper polarity of LED – when soldering a new LED, make sure that the plus and minus are connected correctly (usually there is a marking on the board). + and –).
• 🧲 Getting trash under the plumes - before connecting the plumes, clear the connectors of dust and solder.
• 🔧 Using inappropriate tools – metal blades can scratch the board, and too thick screwdrivers can tear the screws.

If the indicator does not light up after replacement, check again:

• Integrity of soldered contacts (with the soldering method).
• The density of the connection of the plume (if the module was used).
• The voltage at the contacts of the indicator (should be ~3V).

⚠️ Warning: If the phone doesn't turn on after assembly, don't panic. First check if the battery plume is plugged in. Then try plugging in the charger -- sometimes the phone only wakes up when power is applied. If that doesn't work, take the device apart and look for a short circuit on the board.

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If you're not sure about your brazing skills, you might want to replace the flexible plume with the indicator, which is less risky and doesn't require micronutrients.

FAQ: Answers to Frequent Questions