JBL Tour Pro 3 is a new generation product recently released by JBL. The charging case is equipped with a 1.57-inch touch screen, which supports dynamic display of time, battery life, ANC, music playback, message preview, etc. It supports function control such as answering calls, finding headphones, noise cancelling mode, spatial audio, etc. It supports customized screen savers, timers, flashlights and other functions. It can also act as a wireless adapter to transmit audio from devices that do not support bluetooth to the headphones.
JBL Tour Pro 3 has upgraded dual driver units and, through a two-way design, combines the advantages of the armature driver’s high-frequency range and the dynamic driver’s mid/low-frequency range to truly restore the details of each frequency band; it supports LDAC decoding and has passed the Hi-Res Wireless certification; it supports 360° sound effects with head tracking to provide more immersive spatial audio; it supports low-volume dynamic audio equalization and dynamic equalization automatic compensation; it also has a personal sound enhancement function that customizes the EQ equalization curve based on the structure of the personal ear canal.
JBL Tour Pro 3 supports Adaptive Digital Noise Cancelling 2.0, which can adjust the noise cancelling depth in real time according to the ambient noise level, and compensate for the noise cancelling loss by scanning the ear canal, thereby greatly improving the active noise cancelling capability. It supports 6-MIC + AI call noise cancelling, effectively clearing ambient noise and echo, optimizing the pickup of vocals for providing clear calls. The battery life with ANC on is up to 8 hours, and the comprehensive music playback time is up to 32 hours. It also supports fast charging and wireless charging functions.
We have previously teardown JBL products including: JBL Soundgear Frames, JBL TUNE Beam, JBL TUNE 130NC, JBL WAVE FLEX, JBL FLASH, JBL FREE II, JBL PULSE 5, JBL FLIP ESSENTIAL 2, JBL CLIP4, JBL Quantum 360P, JBL LIVE660NC, JBL KMC300 K, JBL Quantum Stream Wireless, etc.
01/ JBL Tour Pro 3 Earbuds Teardown
Disassemble the back cover of the earbud stem. The LDS laser antenna and touch detection electrode are printed inside the cover. The motherboard inside the cavity is fixed by the positioning column and connected to the FPC through the BTB connector.
Take out the motherboard unit, and weld the soft-pack button battery on the back of the motherboard.
Disassemble the earphone cavity, and fix the FPC inside the front cavity with a hot melt column.
Take out the FPC and dynamic driver, and connect the armature driver with wires below.
Take out all components inside the front cavity.
The Knowles armature driver equipped in the earphone, laser engraved model 63016.
After actual measurement, the length of the armature driver is about 5.61mm, the width is about 2.07mm, and the height is about 2.80mm.
The dynamic driver inside the earphone is responsible for the bass part. According to the official introduction, it uses an ultra-lightweight DLC composite diaphragm with high stiffness characteristics.
After actual measurement, the diameter of the dynamic driver is about 10.75mm.
The MEMS microphone of the laser carving GY24 is a built-in feedback microphone, which is used for ANC and call noise cancelling, etc.
The optical wearing detection sensor is used to automatically pause music playback when the earbuds are taken off, and automatically resume playback after wearing.
The FPC connects to the BTB connector of the motherboard.
The model of the built-in soft-pack button battery in the earbuds is: 1250PF4D, rated capacity: 65mAh 0.26Wh, from VDL.
The circuit on one side of the headphone motherboard.
The circuit on the other side of the headphone motherboard.
LY ICP1205 is a linear charging IC that supports bidirectional power line communication and is an earphone analog front end designed for TWS systems. ICP1205 integrates programmable linear charging, power path management, carrier and transparent communication, earphone transport mode and other functions, with extremely low operating power consumption and standby function. The chip supports multiple perfect protection functions, and supports bluetooth master firmware upgrade and data transmission functions.
At the same time, ICP1205 is paired with ICP1106 to support efficiency charging mode. The output voltage of the charging case can be adjusted according to the earphone battery voltage, which can increase the charging case battery capacity conversion rate by about 20%.
6-axis motion sensor from TDK – ICM-42607-C, providing accurate support for gesture movement. Lithium battery protection IC with silkscreen 2g 4z.
Metal dome connected to the touch detection electrode on the inside of the cover.
Metal dome connected to the bluetooth antenna.
IC with silkscreen UKG.
MEMS microphone with laser engraving GY24, an external feedback microphone, used for noise cancelling function to pick up external environmental noise.
AIROHA AB1585 bluetooth audio SoC, supporting LE Audio and Bluetooth 5.3. Integrates ARM Cortex-M33F application processor, HiFi 5 DSP, bluetooth transceiver and power management unit (PMU); supports hybrid ANC, new generation echo cancellation and AI noise cancelling solutions to improve the audio quality of headset voice calls. Supports Airoha MCSync technology, allowing seamless switching between left and right earbuds for more balanced sound and low latency.
26.000MHz crystal oscillator, providing clock for bluetooth chip.
The third laser-engraved GY24 MEMS microphone is used to pick up sound for the voice call function.
02/ JBL Tour Pro 3 Charging Case Teardown
Tear off the rubber pad on the back, there are no hidden screws underneath.
Pry open the bottom case to take out the charging bin structure.
The PCBA small board is set inside the bottom case, and the screen unit is set on the cavity wall.
Remove the screws and take out the small board.
Bluetooth pairing button and buzzer for search function.
A ZIF connector is set on the other side of the small board to connect the FPC.
Take out the screen inside the cavity.
The HYNITRON CST820 high-performance self-capacitive touch chip is set on the screen FPC – using a high-speed MCU core and embedded DSP circuit, combined with fast self-capacitive sensing technology, it can widely support a variety of self-capacitive patterns including triangles. Single-point gestures and real two-point operations are implemented on it, achieving extremely high sensitivity and low standby power consumption.
The BTB connector connecting the screen FPC to the motherboard is from OCN, model OK-23GM024-04.
The structure on one side of the charging bin, the motherboard is fixed by screws on the lower frame, and the battery unit is set inside the frame.
The other side of the charging bin is equipped with a wireless charging receiving coil.
Remove the wireless charging receiving coil, and the NTC for detecting the wireless charging temperature is set below.
Remove the frame and battery.
The bottom of the charging bin is also equipped with an FPC board for charging earbuds.
Disconnect the wires and the circuit on one side of the charging case motherboard.
The circuit on the other side of the charging case motherboard.
The bluetooth antenna of charging case.
ZIF connector for connecting the thermistor FPC.
BTB connector for connecting the screen FPC, from OCN, model OK-23GF024-04.
40.000MHz crystal oscillator, used to provide clock. MXIC MX25U25643G serial NOR flash memory, capacity 256M.
ZIF connector for connecting the function button small board FPC (①), ZIF connector for the FPC small board for charging earbuds (②), IC with silk screen PX E3 (③) and IC with silk screen S4V45F (④).
LY ICP1106 power management chip – integrates switch charging, Boost synchronous boost, power path management, headphone independent plug detection, two-way communication, OVP, OCP protection and other functions, with powerful performance, high integration, simple peripheral circuits and other characteristics.
ICP1106’s charging voltage, charging current, and output voltage can be flexibly configured through I2C, which can easily realize TWS fast charging. Supports power line carrier two-way communication and UART two-way communication mode, which can meet the information interaction requirements of charging case and earbuds. Supports transportation mode, and the lowest standby power consumption can be 1uA. Supports 0V and 2.4V, battery voltage and other voltage output standby modes.
AIROHA AB1571DN bluetooth audio SoC. AB157x is a single-chip solution supporting Bluetooth 5.3 and LE Audio, with a built-in ARM Cortex-M4F application processor for high performance and high power efficiency. Embedded Tensilica HiFi Mini processor for I/O peripheral control, protocol stack and DSP processing functions of AB157x.
AB157x integrates audio codec, hybrid active ANC, new generation echo cancellation and ultra-wideband AI intelligent noise cancelling solutions. Supports new generation of ambient sound. Supports LE Audio and Auracast broadcast audio, enabling richer bluetooth use cases. Plus, with AIROHA/MTK bluetooth high data rate technology, AB157x can transmit lossless audio to enhance audio quality and music listening effects.
26.000MHz crystal oscillator that provides clock for bluetooth audio SoC. IC with silkscreen P113.
IC with silkscreen CBB S2C.
TPS SY5320 overvoltage and overcurrent protection IC is a highly integrated protection IC with input undervoltage and overvoltage protection, lithium battery front-end overvoltage protection, load current abnormality protection, and overtemperature protection. Supports 28V input withstand voltage, and overvoltage shutdown protection is less than 1uS. Supports high-precision battery overvoltage protection function, which is applied to the front end of the charging circuit or low-voltage system to protect lithium batteries or low-voltage systems from abnormal input failures.
Realtek RTL8762DT bluetooth low-power single-mode SoC. Supports Bluetooth 5.1 specification and has excellent low power performance. The CPU uses an ARM Cortex-M4 core with a floating-point unit (maximum main frequency 90MHz) to cope with various transaction processing and display requirements. The screen interface supports I8080, QSPI and SPI general interfaces, which can be adapted to various types of screens.
ConvenientPower CPS4019 is a high-efficiency wireless charging receiver chip that supports 5W wireless charging reception. The chip integrates synchronous rectifiers and low-dropout regulators to charge system devices and batteries, providing a good experience for devices powered by built-in batteries.
CPS4019 integrates an 8051 core, built-in 16KB MTP memory and 2KB SRAM. It supports advanced power management and ultra-low standby power consumption, and the chip has I²C pins and GPIO pins. It supports output voltage regulation and has a built-in 12-bit ADC for input and output parameter acquisition. The chip has built-in rectifier overvoltage protection, LDO overcurrent protection and overheating protection, and uses WLCSP-30 packaging.
Charging case built-in lithium battery label information – Model: GSP902540, nominal voltage: 3.8V, rated capacity: 850mAh, rated energy: 3.23Wh, charging limit voltage: 4.35V.
Tear off the external insulation protection, the battery protection board circuit is equipped with an integrated lithium battery protection IC and a thermistor for detecting battery temperature.
The lithium battery protection IC with silkscreen 4V 6C is responsible for overcharge, overdischarge and overcurrent protection of the battery.
Remove the FPC board for charging the earbuds.
The Hall element with silkscreen AR407 notifies the charging case MCU and earbuds to connect/disconnect with the paired device by sensing the magnetic field changes (Hall effect) when the charging case lid is opened/closed.
All components of JBL Tour Pro 3 true wireless noise cancelling earphones.
03/ Summary
Although the JBL Tour Pro 3 charging case is equipped with a display, it is not much different from mainstream TWS earbuds. The earbuds adopt a stem-shaped in-ear design, the body curve fits the auricle firmly, and is equipped with 5 sizes of eartips to provide users with personalized choices.
The earbuds is equipped with 11mm dynamic driver + Knowles armature driver, providing tri-frequency balanced sound quality. A single earbud is equipped with three MEMS microphones for noise cancelling, calls, adaptive dynamic equalization and other functions. AIROHA AB1585 bluetooth audio SoC is used for wireless connection and audio data processing. TDK ICM-42607-C six-axis motion sensor is used to collect head motion data for spatial audio function. The built-in battery capacity is 65mAh, equipped with LY ICP1205 linear charging IC for charging.
The charging case is equipped with an 850mAh lithium battery, and uses the LY ICP1106 power management chip and the ConvenientPower CPS4019 wireless charging receiver chip. The motherboard is equipped with the AIROHA AB1571DN bluetooth audio SoC for communication with headphones and mobile phones. It uses the Realtek RTL8762DT bluetooth low-power SoC and the MXIC MX25U25643G serial NOR flash memory for screen function control. It uses the TPS SY5320 overvoltage and overcurrent protection IC to protect the subsequent devices.
PS: Translated from 52audio
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