ThinkPlus is a smart ecological strategy launched by Lenovo‘s ThinkPad brand, which mainly enriches ThinkPad peripheral products on the basis of PC. In the personal audio market, Thinkplus has launched a series of products such as TWS earbuds, neck-mounted earphones, bone conduction earphones and bluetooth speakers. Wide range of products with very favorable prices.

Thinkplus Live Pods LP80 is a product that focuses on appearance. In appearance, the charging case adopts a transparent shell design, which is small and round. The earbuds adopt a semi-in-ear design for comfortable wearing. In terms of functional configuration, it is equipped with a 13mm dynamic driver and supports AAC codec. The built-in high-sensitivity microphone supports environmental noise reduction and improves the call effect. It supports low-latency games and has a comprehensive battery life of 20 hours. Let’s take a look at the detailed teardown report of this product.


01/ Lenovo LP80 charging case teardown

Remove the screws and take off the transparent case.

Teardown the inner cavity and take out the charging cockpit structure.

The bottom structure of the charging cockpit, the motherboard unit is fixed by screws.

The side structure of the charging cockpit uses double-sided adhesive to fix the battery.

Remove the screws and remove all components on the charging cockpit.

The bottom structure of the charging cockpit is equipped with three magnets for absorbing the charging case cover and earbuds.

The circuit on the side of the motherboard of the charging case.

The circuit on the other side of the charging case motherboard.

A flat cable circuit that connects the Hall element to the motherboard.

The flat cable is connected to the ZIF connector of the motherboard.

The Hall element of the silk screen 01S5 is used to sense the magnetic field change when the charging case is turned on/off, and then notify the charging case MCU and earbuds to pair or disconnect the connected device.

Two LED indicators of different colors are used to feedback the charging status.

LYMICRO LY6294E power management chip integrates lithium battery charging management, synchronous boost converter, battery power management and protection function modules. It supports Hall to directly drive and control the EN pin to realize automatic connection of earphones when the cover is opened, 8S when the cover is opened, and automatic activation of the boost when the cover is closed, without the need for additional output loop control circuits such as MOS tubes and triodes. At the same time, the MCU can also be used to control the EN pin to control the rapid turn-on and turn-off of the OUT to realize the communication between the charging case and the earbuds, without additional control MOS and current discharge MOS.

The LY6294E chip has built-in perfect overvoltage and overcurrent protection, and supports LED light power indicator, which is an ideal solution for single-chip charging case. According to 52audio, LYMICRO LY6294E and Grain semiconductor GR3314E are the same chip.

1R5 power inductor, with the power management chip is responsible for the charge and discharge management of the battery.

The charging case is a metal dome connector for earbuds charging.

The charging case built-in lithium battery model: XY 701535, capacity: 300mAh 1.11Wh, voltage: 3.7V.

The battery is equipped with a circuit protection board, using DW01A lithium battery protection IC and 8205A MOS tube.


02/ Lenovo LP80 earbuds teardown

Enter the teardown part of the earphone and open the cavity along the mold line of the earphone head.

A lithium battery is installed inside the rear chamber, and a magnet is fixed on the wall of the chamber for fixing with the charging case.

Take out the speaker, the internal structure of the front cavity.

The dynamic driver front diaphragm.

The back of the dynamic driver is engraved with the word “KBM”, and the tuning holes are set around it and protected by tuning cotton.

After actual measurement, the size of the speaker is about 13mm.

Take out the lithium battery inside the rear chamber, and connect the battery and the speaker to the main board in the headset stem through wires.

The earphone has a built-in soft pack lithium battery, model: LR 450909, voltage: 3.7V, capacity: 30mAh.

Disconnect the wires, remove the tail plug, and pull out the internal motherboard unit.

Inside the tail plug structure, two metal connectors are connected to the motherboard for charging.

The circuit on one side of the headphone motherboard.

The circuit on the other side of the headphone motherboard.

Ceramic bluetooth antenna for wireless signal transmission.

The metal connector for touch control corresponds to the touch area on the side of the headset stem.

BLUETRUM AB5616E2 bluetooth audio SoC, built-in 32-bit high-performance RISC-V processor, supports DSP instructions, and runs at a frequency of up to 125MHz. AB5616E2 supports Bluetooth 5.3, the maximum transmission output power is +8dBm, and the reception sensitivity is -93dBm. Built-in PMU, such as charger/buck/LDO.

AB5616E2 has 16-bit mono DAC and 16-bit mono DAC audio codec, which supports flexible audio equalizer adjustment. Support sample rate 8, 11.025, 12, 16, 22.05, 32, 44.1 and 48KHz. Supports mono microphone amplifier input. High performance mono audio ADC with 91dB SNR. High-performance mono audio DAC with 97dB signal-to-noise ratio and headphone amplifier output. The operating temperature of AB5616E2 is -40°C to +85°C; the storage temperature is -65°C to +150°C.

Electret microphone for voice call pickup.

LED indicators for feedback of bluetooth pairing and charging status.

The crystal oscillator of the laser carving YL260 provides the clock for the bluetooth chip.

All components of Lenovo Thinkplus Live Pods LP80 true wireless earphones.


03/ Summary

In terms of appearance, the charging case of Lenovo LP80 adopts a circular transparent shell design, the overall size is light and portable, and it is portable when going out. The earphone adopts a handle-shaped semi-in-ear design, with a body weight of only 3.1g, providing a very comfortable and light wearing experience.

In terms of internal structure configuration, the charging case has a built-in 300mAh lithium battery and uses a Type-C interface to input power. The LYMICRO LY6294E power management chip is responsible for the charge and discharge management of the battery, and integrates a synchronous boost converter, battery power management and protection function modules. A single chip provides a complete power solution for charging case.

The earphone is equipped with a 13mm dynamic driver and a 30mAh lithium battery, which are respectively connected to the main board in the headset stem through wires. The motherboard adopts BLUETRUM AB5616E2 bluetooth audio SoC, built-in 32-bit high-performance RISC-V processor. Support DSP command, Bluetooth 5.3 and audio equalizer adjustment, built-in PMU for power management. An electret microphone is used for voice call pickup.

Source: 52audio


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