JBL is a well-known audio brand under Harman Kardon, founded in the United States in 1946. JBL can not only provide audio systems for professional venues such as recording studios, concert halls, movie theaters and stadiums, but also produce stereo home theaters, multimedia audio, car audio, high-fidelity headphones, etc. The range of audio products and services is very wide, covering professional Domain and civilian level.

Facing the bluetooth audio market, JBL has also continuously launched new products to meet market demand. What 52audio is going to disassemble today is the JBL LIVE PRO+ true wireless noise reduction earphones, which uses a hybrid digital noise reduction scheme. The official advertised maximum noise reduction depth is 40dB. There are three noise reduction modes preset in the earphones, and it supports intelligent ambient sound mode. You can talk with people around you without taking off your headphones; JBL LIVE PRO+ has a built-in 11mm high-quality dynamic driver, JBL iconic sound effects, and a custom EQ curve in the APP.

In other respects, JBL LIVE PRO+ true wireless noise-cancelling headphones use 3-microphone call technology to suppress wind noise; the headphones support touch control, have in-ear detection functions, and have a waterproof rating of IPX4, which can be worn for sports; a single battery life of the earphones is about 7 hours. It supports fast charging with 10 minutes of charging and 1 hour of battery life. The charging case can provide an additional 21 hours of battery life and supports wireless charging. From a functional point of view, this should be the latest flagship TWS earbuds from JBL. Let’s take a look at the detailed disassembly report!

The previous JBL products teardown by 52audio are: JBL TUNE 225, JBL T280TWS, JBL TUNE 120, JBL Free, JBL REFLECT CONTOUR2 and JBL CHARGE4 bluetooth speaker.

| 1. JBL LIVE PRO+ charging case teardown

Pry open the charging cockpit, the shell is relatively thick.

The wireless charging receiving coil is fixed on a piece of magnetic isolation paper.

The back of the charging case is a metal fixed structure.

The battery is located on the front of the fuselage.

Below the wireless charging receiving coil, the metal bracket is fixed with screws.

The inner side of the metal parts mainly plays the role of protecting and fixing the main board.

Internal structure of charging case.

Magnetic paper.

Disconnect the battery wire from the socket connected to the motherboard and take out the battery. There is also a PCBA inside.

The two PCBAs are connected by metal pins.

Take out the internal circuit of the charging case, inside the charging cockpit. There is a small magnet at the sound cavity of the left and right earphones, and a U-shaped magnet at the handle of the earphone, which is used to magnetically fix the earphones. There are also two magnets in the open position of the box cover to attract the box cover.

The light guide column and light leakage protection cover of charging case indicator.

Charging case internal circuit.

The other side of the charging case internal circuit.

The two PCBAs are connected by metal pins.

Metal pin base.

PCBA side circuit.

Circuit on the other side of PCBA.

Connect the metal pins of two PCBAs.

The FPC of the Hall element is welded on the main board, and the FPC is heightened with plastic parts.

AJOP’s Hall element with silk screen printing. The magnetic field changes when the charging case lid is opened and closed will be sensed by the Hall element, and the charging case will be notified to the MCU and earphones to pair or disconnect with the connected device.

Pogo Pin for charging earphones.

Jog button.

Three LED indicators, buttons and charging contacts have TVS for electrostatic protection.

charging case main PCBA circuit.

Socket for the metal pin of another motherboard.

Circuit on the other side of PCBA. The USB Type-C interface socket is soldered on the motherboard, the upper left corner is the connector socket for the battery wire, the upper right corner is the solder joint of the wireless charging receiving coil, and a chip is covered with a thermal pad.

Wireless charging receiving coil, multiple enameled wires are wound in parallel.

ChipsVision CV8013N wireless charging and receiving SoC, with high integration, high efficiency, low heat, rated power 5W, compatible with Qi V1.2.4 standard, support OCP, OVP, OTP and FOD functions, suitable for TWS earphones charging case, smart watches , Mobile power, smart phones and other equipment.

According to 52audio, ChipsVision CV8013N has been widely adopted by many audio brands, including: Anker Liberty Air 2, Soundcore Liberty 2 Pro, Dacom K6H TWS, ROWCING TWS true wireless headphones, etc.

TPS’s SY8801 chip specially designed for TWS earphone charging compartment, based on the design to ensure safe and high reliability (support 28V input withstand voltage, built-in full-featured charging and discharging overvoltage, overcurrent, overtemperature, short circuit protection and other functions) , It also integrates I2C communication function and internal communication isolation function. Through the I2C interface, the MCU of the system can read and configure the internal functions of the power supply and the parameters of battery charging and discharging management, and easily realize such as NTC protection, segmented adjustment of battery current, TWS earphone storage, storage detection, and automatic power output. And other functions.

The internal communication isolation module integrated by TPS SY8801 greatly optimizes the functional design of the smart TWS charging compartment. No complicated peripheral circuits are required. The MCU can be connected to control the SY8801. Not only can it realize the function of charging the earphones, but also the data communication transmission can be carried out through the power source POGO PIN connected with the earphones, which includes functions such as uploading the power of the charging bin, clearing the pairing of the earphones in the charging bin, restoring factory settings, and upgrading the earphone software.

According to 52audio, the TPS earphones charging case power management chip of TPS has been adopted by many well-known brands such as OPPO, Xiaomi, Baidu, 1MORE, 233621, Transsion, and OnePlus.

Two power supply switching tubes of silk-screened MOY.

Eastsoft HR8P506FHNK general purpose 32-bit single-chip microcomputer, adopts QFN32 package, 30 I/O ports, 36K×8-bit FLASH ROM, 8K×8-bit RAM, and has a maximum operating frequency of 48MHz. It can be applied to small household appliances and industrial control instruments.

The charging case uses a cylindrical lithium battery, both ends are wrapped with insulating tape.

Battery label information, the manufacturer is Chongqing VDL Electronics Co., Ltd., model 13315, rated capacity 500mAh/1.85Wh, rated voltage 3.7V, charging limit voltage 4.2V.

According to 52audio, well-known brands such as Huawei, Xiaomi, Meizu and OPPO have adopted VDL batteries in large numbers.

The information on the battery cell is consistent with the label.

The battery protection board is wrapped with insulating tape.

Nickel sheets for the positive and negative electrodes of the battery.

The battery protection board is responsible for the protection functions of the battery such as overcharge, overdischarge and overcurrent, and has the thermistor to detect the battery temperature.

| 2. JBL LIVE PRO+ earphones teardown

Let’s continue to disassemble the earphone part of JBL LIVE PRO+. The earphone is a handle ear design to achieve a better active noise reduction effect.

The outer side of the earphone handle is a flat surface, with the JBL brand logo on the bottom. The top of the earphone handle supports touch control. The left and right earphones single click, double click, triple click and long press correspond to different operations, which can be customized in the APP.

The sound pickup hole of the feedforward microphone on the top of the earphone handle picks up ambient sound for active noise reduction and call noise reduction.

The sound pickup hole of the call microphone at the bottom of the earphone handle is used to pick up the human voice during a call.

The charging contacts and hidden indicator lights on the inside of the earphone handle have L/R left and right logos at the bottom.

The pressure relief hole of the earphone sound cavity balances the internal and external air pressure.

There is a back-feed microphone in the pressure relief hole near the mouthpiece to pick up the sound in the ear canal for active noise reduction and call noise reduction.

The metal dust-proof net at the mouthpiece prevents foreign objects from entering.

Disassemble the earphones along the parting line.

There is an L/R mark on the inside of the earphone cover, the LDS antenna transmits wireless signals, and the top position can sense touch operations.

Inside the earphone handle, there is a Pogo Pin connecting the LDS antenna and the touch sensing area. There are L/R left and right marks on the main board, and the joints are sealed with glue.

The internal components of the sound cavity are connected to another FPC from the main board through the FPC.

FPC connector location.

There is a transparent insulating sheet between the internal components of the sound cavity and the battery.

The soft pack battery is connected to the main board through a wire.

There is an L/R mark on the FPC in the sound cavity.

FPC for in-ear detection.

Solder the solder joints between the speaker unit and the FPC, and there is a feedback microphone below.

The magnet that attracts the charging cockpit.

Take out the loudspeaker unit and the feed-back microphone, and fix them with a large amount of sealing glue.

The location of the back-feed microphone, on the side of the sound mouth, near the pressure relief hole.

The MEMS microphone of LaserDiao MC28 HL2N is used to pick up the mixed sound in the ear canal and assist active noise reduction.

Take out the dynamic driver of the earphone. There is a metal cover to protect the inner diaphragm. The special shape is adapted to the structure of the earphone, which is difficult to produce. This is the shape of the unit, not the deformation caused by disassembly.

The other side of the speaker unit.

The speaker unit is in the shape of an “egg” with a width of about 10.1mm.

The speaker unit is about 11.1mm long.

The FPC in the earphone sound cavity is connected to the moving coil unit, the in-ear detection FPC and the feed-back microphone.

The soft pack battery is fixed on a plastic bracket.

Remove the battery to see the circuit on the top of the strip-shaped motherboard.

Continue to disassemble from the earphone handle and take out the protective cover of the bottom call microphone.

The sound guide structure, 90° angle design, can prevent water from entering, and also has a certain anti-wind noise effect.

The pickup hole of the call microphone has a dust-proof net.

The other ear of the earphone detects the position of the FPC and the dust net of the pressure relief hole.

The inner structure of the earphone shell.

Inside the earphone handle, there is a “U” magnet outside the charging thimble to absorb the charging cockpit.

The main circuit inside the earphone.

The FPC is connected to the motherboard through a connector.

The FPC integrates in-ear detection, which is connected to the FPC in the sound cavity through the connector socket.

There are L/R left and right marks on the plastic bracket for fixing the battery.

Separate the soft pack battery and bracket.

The size comparison of the soft pack battery and the coin.

The size comparison between the strip motherboard and the coin.

Magnetic separator on the soft pack battery.

Below is the two-dimensional code of the battery, you can check the authentication information.

The button-type soft pack battery comes from VDL like the charging case battery, model 1254, with a rated voltage of 3.7V and a rated capacity of 0.204Wh.

Circuit outside the motherboard.

The internal circuit of the motherboard.

The main control chip of JBL LIVE PRO+ true wireless noise reduction headphones is BES BES2300YP. BES2300 has multiple versions and different configurations with different suffixes. 52audio has classified this in detail before. Both BES2300Y/YP models support active reduction. Noise function.

The BES2300 series is a fully integrated adaptive active noise reduction solution that supports bluetooth 5.0, IBRT low-frequency forwarding technology and dual-mode bluetooth 4.2. It also supports the third-generation FWS full wireless stereo technology, dual microphones, etc., using 28nm HKMG CMOS process, BGA package . BES2300 supports high-performance adaptive active noise reduction technology, which allows high-end active noise reduction headphones to use a fully integrated chip to achieve high sound quality and active noise reduction.

In addition, BES2300 also supports external heart rate sensors, acceleration sensors and other external sensor devices and eMMC flash memory, which can achieve the purpose of playing music on external storage devices. BES2300 can output sound to headphones and home audio, and can also record from an external microphone.

According to 52audio, a large number of true wireless earphones from brands such as Huawei, Samsung, Xiaomi, OPPO, JBL, 1MORE, Honor, Baidu, and OnePlus have adopted BES solutions.

Silkscreen 73L IC.

Silkscreen 0X17 IC.

Silkscreen 51D 0KFI IC.

Laser carving MCL3 HL27’s MEMS silicon microphone is used to pick up ambient sound, which is different from the feed-back microphone and call microphone.

Silkscreen AMAC’s IC.

GOODiX GH610 in-ear detection and touch 2 in 1 solution. GOODiX GH61x series chips, using human capacitance detection patented technology, can assist true wireless earphones to achieve automatic sleep, automatic wake-up, master-slave switching, automatic music start and stop functions, and improve user experience. At the same time, it supports touch, sliding volume adjustment and other rich Human-computer interaction function.

The GH61x series adopts dual-channel in-ear detection and the characteristic that the capacitance detection scheme only responds to electrodes, making it have a lower false recognition rate than traditional optical detection schemes. The chip integrates PMU and MCU, the algorithm runs independently on the chip, and reports events directly to the main controller, without the main control for data processing.

According to 52audio, a variety of TWS earphones from brands such as OPPO, vivo, OnePlus, realme, Baidu, etc. use GOODiX’s in-ear detection and touch 2-in-1 solution.

GOODiX GH61x block diagram.

Connect the Pogo Pin of the LDS antenna.

Connect the Pogo Pin of the touch sensing area.

Laser carving MC29 HLLL’s MEMS microphone is used to pick up human voices during calls.

An LED indicator indicates the working status of the earphones.

All components of JBL LIVE PRO+ true wireless noise canceling headphones.

| Summary

JBL LIVE PRO+ true wireless noise reduction earphones is JBL’s latest flagship product. The appearance design is relatively simple and low-key. The charging case is a clamshell design, the shell is matte, and three LED indicators are hidden in the groove. The charging case “Reset” The “button” is also a hidden design, and many people may not notice it without disassembly; the earphone has a handle-type in-ear structure, which can take into account the best effects of active noise reduction and call noise reduction.

In terms of internal circuits, the charging case makes full use of the vertical space, using two PCBAs connected by metal pins, arranged vertically, and the cylindrical lithium battery is located on the charging case side. The charging case supports wireless charging. The wireless charging receiver IC is ChipsVision CV8013N, rated power 5W, compatible with Qi standard; wired power input is USB Type-C interface, TPS SY8801 is responsible for input protection and battery charge and discharge management, through I2C interface, Eastsoft MCU More charging case functions can be realized. The supplier of cylindrical lithium batteries comes from VDL, with a capacity of 500mAh.

In the earphone part, JBL LIVE PRO+ adopts a hybrid noise reduction scheme, the noise reduction chip is BES BES2300YP, and also supports intelligent ambient sound mode; the earphone uses a large-area LDS antenna to transmit signals; in addition to the feedforward microphone and the feedback microphone, the earphone also A MEMS microphone is composed of a three-microphone array and is used for call noise reduction; the capacitive in-ear detection and touch control of the earphones are from GOODiX, and the control IC is GH610; the dynamic driver of the earphones has an “egg” appearance to adapt to special The structure, width 10mm, length 11mm, supports JBL’s iconic sound effects, and can customize EQ in the APP; the earphones uses a soft pack battery with a capacity of 0.204Wh, and 7+21 hours of battery life is good.

Source: 52audio

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  1. Amazing work! Congrats!!
    Any clue where I can find a replacement battery for the charging case?
    Thank you!

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