Xiaomi 1901F7G: model decoding, characteristics and application

The 1901F7G code in the name of Xiaomi’s device is often questioned by users, not by a random set of characters, but by a specific model or component marker that can be used in different categories of brand technology, from smartphones to smart gadgets. In this article, we will discuss in detail what this label means, what device it belongs to, and what nuances it is important to know when working with it.

Note right away: 1901F7G is not the name of a smartphone or tablet in the usual sense, and it is the code most often associated with motherboards or power modules in Xiaomi devices, especially in the Mi TV or Mi Box lines. However, without context (for example, photos of the device or its full name), it is difficult to determine the purpose, and then we will analyze all possible options and give clear recommendations for identification.

If you find this marking on your device, don't rush to look for firmware or parts. First, you need to understand what 1901F7G is, because it's going to take you from simple software updates to complex repairs.

What does the 1901F7G code mean in Xiaomi devices?

The 1901F7G marking is an internal identifier that Xiaomi assigns to certain components or finished devices.

• 📅 1901 - The first four characters usually denote the year and month of development (January 2019.
• 🔧 F7G — An alphanumeric suffix indicating a board modification, firmware version or region, such as F may mean global, and G may mean a specific configuration for a particular market.

Important: This code is not a serial number (it is usually longer and contains letters/digits in random order). 1901F7G is a model index that helps service centers and engineers quickly identify the component.

In practice, 1901F7G is most commonly found in the following devices:

• 📺 Mi TVs TV 4S/4A (particularly 2019–2020 The code can be printed on a motherboard or power supply.
• 🎮 Mi Box S or Mi Box 4 – Media players where this marking indicates a board revision.
• 🔌 Chargers or power adapters for Xiaomi laptops (for example, for Mi Notebook).

Technical characteristics of devices marked 1901F7G

Since 1901F7G can be used for different devices, we have collected a summary of the technical data for the most likely variants, and if your device does not fit these descriptions, see the section on “How to accurately identify a model”.

A critical point: if the 1901F7G is listed on a power supply, never use it with devices it's not designed for, even if the connector is suitable. For example, the Mi Notebook adapter may disable the Mi Box due to a mismatch of voltage.

For TVs and media players with this marking, the following features are relevant:

• 🔄 Support for automatic software updates, but only through official Xiaomi servers (self-driving firmware can lead to blocking).

💡

If your device has a sticker with the code 1901F7G, take a picture and check the compatibility of parts through the service Xiaomi Parts.

How to identify the model by the code 1901F7G?

If you are not sure which device the marking refers to, follow the following steps:

Find a sticker with the full model name (usually on the back)

Check the serial number in the Settings menu → About the device

Compare the photo board with the database on Xiaomi Firmware

Contact Xiaomi with a photo sticker and board-->

For example, for Mi TVs, the full name might look like this: L55M5-5ASR (where 55 is diagonal, M5 is series, 5ASR is revision), and the 1901F7G code would refer to the motherboard version.

For media players (such as the Mi Box S), the labeling is usually duplicated on the box and in documents. If it says MDZ-22-AB and the board says 1901F7G, this means that you have a second revision of the board (with improved cooling and Dolby Vision support).

⚠️ Warning: If you disassemble the device and find the code 1901F7G It can be a party number, not a model, in which case, use the full serial number to search for parts (starts with a full serial number). SN:).

Frequent Problems and Solutions for 1901F7G Devices

Devices with this label can experience specific malfunctions, and we've collected the most common cases and ways to fix them.

1. Mi TVs are not included

Symptoms: The indicator flashes red, there is no image, but there is a sound.

• 🔌 Check the power supply (if indicated on it) 1901F7G, The condenser may have burned. C205).
• 🔄 Reset the settings via the button combination on the remote: Menu + Volume Down (hold 10 seconds).
• 🛠️ If the fee is damaged, replace it with a similar (cost) ~5 000 ₽ for 2019 models).

2.Mi Box S does not connect to Wi-Fi

Symptoms: The device sees the network but fails to connect or permanently breaks the connection.

• 📶 Update the firmware through Settings → About the device → Updating the system.
• 🔧 Reset network settings: Settings → Network and Internet → Forget the net.
• 🔌 Use an Ethernet adapter (for the Mi Box S) UGREEN USB 2.0 to RJ45).

3. power supply from 1901F7G is not working

Symptoms: the device does not charge, the adapter warms up or squeaks.

• ⚡ Check the voltage with a multimeter (should be) 19.5V–20.5V Xiaomi laptop).
• 🔌 Check the cable for damage (especially at the connector) USB-C).
• 🛒 Replace the adapter with the original (article: ADP-65SD C for 2019 models).

⚠️ Note: if the power supply is marked 1901F7G It starts to smoke or smell like a burn -- immediately disconnect it from the network.

Where to buy spare parts for 1901F7G devices?

If you need a replacement board, power supply or other component with this label, contact the following places:

When buying spare parts, pay attention to:

• 🆔 Exact code matching (e.g, 1901F7G and 1901F7H — revision!).
• 📦 Package: Some sellers offer boards without radiators or connectors.
• 📄 Guarantee: minimum period - 3 months (for used parts - 1 month).

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Before buying a spare part, be sure to check its photo with your board - even when the code matches, connectors or the location of elements may differ.

How to update firmware on devices with 1901F7G?

The software update for devices with this label has its nuances. For example, Mi TVs with a 1901F7G board do not support manual firmware installation via USB if the software version is newer than 2.1.65.

Instructions for Mi TV 4S/4A:

1. Download the firmware from the official website (the file should be called update.zip).
2. Put it in the root USB-storage (FAT32).
3. Insert the flash drive into the TV and go to Settings → About TV → System Update → Local Update.
4. Confirm the installation and wait for the reboot (do not turn off the power!).

For the Mi Box S:

1. Activate the Developer Mode:


- Go to Settings → About the device




- 7 times press the Assembly Number




2. Connect to ADB and execute the command:




adb shell am start -n com.android.tv.settings/.deviceinfo.StorageSettingsActivity




3. Select the firmware file and confirm the update.

⚠️ Note: If you update your TV Mi TV It stopped turning on, and the indicator flashes red 3 times, which indicates damage to the bootloader. USB Burning Tool (for experienced users only!).

Useful tools for identification 1901F7G

If you are unable to identify the device by external signs, use these services:

• 🔍 Xiaomi Parts Finder – Enter the serial number or upload a photo sticker.
• 📱 Xiaomi Firmware – a firmware database with compatible models.
• 💬 Forums 4PDA — Mi repair topics TV and Mi Box with board photos.

To accurately identify the 1901F7G board, you can use the CPU-Z (for Android devices) or AIDA64 application.

• 🖥️ Processor model (e.g., Amlogic) T962 for Mi TV 4S).
• 📋 Firmware and core version.
• 🔋 Information about the power supply (voltage, current).

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If you are not sure about the model, take a photo of the board with the code 1901F7G and ask a question in the topic “Defining Xiaomi model” on 4PDA.

FAQ: Frequent questions about 1901F7G