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| Aroma Neckband-এর LC6956A PCB, CPU IC, Charging IC, Battery এবং important circuit repair points-এর complete visual guide। |
Aroma Neckband Internal Circuit Details and Repair Guide
Aroma neckbands use a compact PCB that combines Bluetooth processing, battery charging, audio input, button control, status LEDs, and other supporting circuits in a very small space. For technicians and electronics learners, identifying the board number, main IC, charging IC, crystal, microphone, battery, and connector details can make fault diagnosis much easier.
This guide is based on the component identification provided for Aroma NB20, NB119, NB124C, and NB124D-series neckbands. Component markings can vary between production batches, so the markings on the actual PCB should always be checked before replacing any IC or battery.
Aroma Neckband PCB and Main Board Details
Board Number and PCB Identification
The main PCB is marked LC6956A, with the full board designation reported as T1_V2.0(LC6956A)-200914.
This board acts as the central interconnection point for the neckband. The battery, charging section, microphone, push buttons, LEDs, Bluetooth/audio circuitry, crystal oscillator, and other components are connected through this PCB.
The LC6956A part itself is also listed by electronics component sources as a JieLi Tech microcontroller/MCU/MPU/SoC device in a QFN-32 package. That external component listing should not be treated as proof that every Aroma board using the LC6956A marking has an identical internal circuit or firmware configuration.
For repair work, the PCB marking is particularly useful because it helps technicians compare replacement boards and locate compatible components.
External Memory Slot and Storage Section
9-Pin Mini Memory Slot
The PCB includes a 9-pin mini memory-card slot according to the supplied board identification.
The slot is intended for external memory expansion where supported by the specific neckband design. Depending on the firmware and board configuration, external storage can be used for audio files or other supported data.
The important point for repair technicians is that a damaged memory connector can create problems that appear to be related to the CPU or software. Bent contacts, broken solder joints, oxidation, or PCB pad damage should therefore be checked before replacing major ICs.
When inspecting the connector, check the complete row of contacts, solder joints, nearby capacitors, supply lines, and ground connection rather than replacing the socket immediately.
Main CPU and Power IC Section
BP03006-56A4 Main IC
The main IC identified for this Aroma neckband board is:
IC Number: BP03006-56A4
Reported Manufacturer/Marking: JL
Pin Count: 30 pins
Primary Role: Main processing and system-control section
According to the supplied board information, the BP03006-56A4 device is responsible for the central operation of the neckband, including user-input processing, Bluetooth-related control, audio processing, and power-management functions.
Because the exact internal architecture and firmware configuration of this particular marked device are not publicly documented in the supplied material, it is safer to identify it as the main CPU/system-control IC for this board rather than assuming every internal function is integrated into the same silicon.
Aroma NB119, NB124C and NB124D CPU Identification
The board information associates the BP03006-56A4 IC with the Aroma NB119, NB124C, and NB124D models, along with other compatible board variants.
For component replacement, do not select an IC only because the marking looks similar. The package, pin arrangement, firmware, PCB revision, and board routing can all affect compatibility.
24 MHz Crystal Oscillator Section
Crystal Frequency and Function
The neckband uses a 4-pin crystal component with a reported frequency of 24 MHz.
A crystal oscillator provides a stable reference clock for digital electronics. In a Bluetooth audio device, accurate timing is important for system operation, communication, audio processing, and synchronization between different parts of the circuit.
If the crystal or its surrounding components are damaged, the neckband may show symptoms such as:
No power-up or incomplete startup
Bluetooth not becoming active
Unstable operation
Failure to initialise correctly
Abnormal current consumption
A technician should inspect the crystal, its solder joints, nearby capacitors, and the traces leading toward the main IC before concluding that the CPU is defective.
Microphone Section
SH-018 Microphone
The microphone section is identified as:
Microphone Marking: SH-018
Connection: 2 pins
The microphone provides the audio input required for hands-free calling and other voice-related functions supported by the device.
The microphone signal is routed into the main audio-processing section, where it can be handled before being transmitted through the Bluetooth connection.
Microphone Repair Checks
If the neckband speaker works normally but the other person cannot hear the user during a call, the microphone circuit should be checked separately.
Start with the microphone itself and then inspect:
The two microphone solder joints
PCB traces around the microphone
Nearby passive components
The microphone bias/supply path
The input path leading toward the main IC
A broken microphone trace can produce the same practical symptom as a defective microphone, so replacing the microphone without checking continuity can lead to unnecessary repair work.
Push Button Control Section
Three Tactile Switches
The PCB uses three push buttons.
The reported switch size is 4 × 4 × 0.8 mm.
These switches are normally used for functions such as power control, volume adjustment, music playback control, track navigation, pairing, or call handling, depending on the firmware and model.
A button fault is often easy to diagnose because the device may still power on and connect through Bluetooth while one or more controls stop responding.
Button Repair Guide
When a button does not work, first inspect the mechanical switch and its four solder points. A switch can fail because of physical wear, liquid damage, cracked solder, or PCB-pad damage.
Use a multimeter in continuity mode to verify whether the switch changes state when pressed. If the switch itself is functioning, check the surrounding resistor network and trace continuity before suspecting the main IC.
Charging Circuit and USB Input Section
I50Ad88 Charging IC
The charging section is identified with the following specifications:
Charging IC: I50Ad88
Reported Pin Count: 5 pins
Charging Connector: Type-B USB
Reported Input: 5V
Reported Maximum Input Current: Up to 2A
Charging Indicator: Red LED
The I50Ad88 is used as the charging-control component according to the supplied board information.
The charging IC is important because the USB input cannot simply be connected directly to the Li-Polymer battery. The charging circuit controls the charging process and helps provide the appropriate electrical conditions for the rechargeable cell.
How the Charging Circuit Works
When a 5V supply is connected to the charging port, the charging circuit receives power and manages the battery-charging process.
The supplied repair data reports approximately 3.8V under the stated charging load condition of 0.2A. This should be understood as a board-specific measured charging condition rather than a universal battery-charging specification.
The red charging LED provides a simple visual indication that charging is active.
Charging Fault Diagnosis
A neckband that does not charge should not immediately be blamed on the battery.
A practical repair sequence is:
Check the USB port for physical damage.
Measure whether the expected input voltage reaches the charging section.
Inspect the charging IC and surrounding components.
Check for short circuits on the battery rail.
Measure the battery voltage.
Check the charging LED and its resistor path.
Verify the battery connector or solder joints.
If 5V is present at the USB input but the charging section produces no correct battery-side response, the charging IC or its surrounding circuitry becomes a strong suspect.
A damaged USB connector can also cause an intermittent charging problem because the mechanical connection may be present while the electrical contact is poor.
Bluetooth Status LED Section
Blue Bluetooth Indicator
The reported Bluetooth indicator uses a blue LED when Bluetooth is active.
The LED provides a quick visual indication that the wireless section has been enabled.
Red and Blue Standby Indication
The supplied board information reports a standby indication using alternating red and blue flashing.
LED behaviour can vary according to firmware state, pairing condition, battery status, or board revision, so technicians should use the observed behaviour together with the model's actual operation rather than treating the LED pattern as an absolute diagnostic code.
Battery Section
XD 481036 Li-Polymer Battery
The battery is identified as:
Battery Model: XD 481036
Battery Type: Rechargeable Li-Polymer
Nominal Voltage: 3.7V
Capacity: 200mAh
Designation: 1ICP5/11/38
Reported Usage: Up to approximately 12 hours under the stated conditions
The battery is the main energy source for the neckband. Its small physical size allows the device to remain lightweight while providing enough energy for portable Bluetooth audio operation.
The reported 12-hour backup figure should be treated as an approximate usage figure because actual runtime depends on volume level, Bluetooth activity, call usage, battery age, temperature, and the condition of the cell.
Battery Replacement Precautions
A Li-Polymer battery must be replaced with a compatible cell having the correct voltage, physical dimensions, polarity, connector or solder arrangement, and appropriate protection arrangement.
Never install a battery solely because its physical size appears similar.
Before replacement, check:
Battery polarity
Nominal voltage
Physical dimensions
Capacity
Connector or solder configuration
Insulation around the battery
Signs of swelling or leakage
A swollen Li-Polymer battery should not be punctured, compressed, or reused.
Aroma Neckband Circuit Operation
Power Flow
The battery supplies the main power rail to the neckband electronics. The main system-control section then coordinates the different operating blocks of the device.
The charging IC works on the battery-management side, while the main IC handles system control and communication-related operations.
The exact power-rail arrangement can differ between PCB revisions, so repair technicians should trace the actual board rather than assuming a generic neckband schematic.
Audio Input Path
During a voice call, the microphone converts the user's voice into an electrical signal.
That signal is processed by the neckband's audio/system electronics and then transmitted through the Bluetooth connection to the paired device.
If microphone audio is missing while Bluetooth playback works normally, this helps narrow the fault toward the microphone, bias network, signal path, or audio input circuitry.
Bluetooth and Audio Output
For music playback, audio data received from the paired Bluetooth device is processed by the neckband's audio circuitry and delivered to the speakers.
The main control system coordinates this operation with the button inputs, Bluetooth communication, and power-management functions.
This separation is useful during troubleshooting because a neckband can have a working Bluetooth connection while still suffering from a separate speaker, amplifier, battery, microphone, or control-button fault.
Common Aroma Neckband Repair Problems and Solutions
Problem: Neckband Does Not Power On
Check the battery voltage first, then inspect the power path and main PCB for signs of corrosion or physical damage.
If the battery has a normal voltage but the device remains completely dead, inspect the main IC supply path, power-related components, button circuit, and PCB connections.
Problem: Neckband Does Not Charge
Start at the USB connector and verify the 5V input.
Next, inspect the charging IC, nearby passive components, battery voltage, and charging LED circuit.
A defective battery and a defective charging IC can produce similar symptoms, so voltage measurements are more reliable than replacing parts at random.
Problem: Battery Charges Very Slowly
Check the USB cable, connector condition, charging input, charging current, battery condition, and charging IC.
A worn battery may also accept charge poorly even when the charging circuit itself is functioning.
Problem: Bluetooth Is Not Working
Check whether the main IC powers up correctly and whether the 24 MHz clock circuit is functioning.
Inspect the PCB for corrosion, cracked solder joints, or previous repair damage.
If the neckband turns on but cannot enter a normal Bluetooth operating state, the fault may be related to the main processor section, clock circuit, firmware, or power supply rather than the Bluetooth antenna alone.
Problem: Microphone Not Working
Check the SH-018 microphone, its two connections, PCB traces, and nearby components.
If continuity and the microphone itself are normal, continue tracing the signal toward the main audio-processing section.
Problem: Buttons Are Not Responding
Test each 4 × 4 × 0.8 mm tactile switch.
A worn switch or cracked solder joint is much more common and easier to repair than a failed CPU input, so the switch and PCB should be checked first.
Problem: Charging LED Works but Battery Does Not Increase
A red LED alone does not prove that the battery is charging correctly.
Measure the battery voltage before and during charging and inspect the charging-current path. A faulty charging IC, damaged battery, high-resistance connection, or PCB fault can leave the indicator active without producing proper charging.
Problem: Neckband Works for a Short Time and Then Turns Off
This symptom commonly requires checking the battery condition first.
A battery with reduced capacity or high internal resistance may show a reasonable voltage at rest but drop significantly when the device is operating.
The power path, charging history, and battery connection should therefore be examined before replacing the main IC.
Supported Aroma Models and Board Compatibility
The supplied board reference associates this PCB and component configuration with the following models:
Aroma NB20
Aroma NB119
Aroma NB124C
Aroma NB124D
These model associations should be used as a repair reference rather than as a guarantee that every production batch contains exactly the same PCB revision.
Before installing a donor board or replacement IC, compare the complete PCB marking, connector arrangement, component placement, battery connection, and firmware compatibility.
Practical Circuit Repair Workflow
Step 1: Perform a Visual Inspection
Look for broken USB connectors, damaged switches, burnt components, corrosion, cracked solder joints, loose wires, and battery swelling.
Step 2: Check the Battery
Measure the battery voltage with a suitable multimeter and confirm that the cell is physically safe to handle.
Step 3: Verify the Charging Input
Confirm that the expected USB input voltage reaches the charging section.
Step 4: Inspect the Charging IC
Examine the I50Ad88 area for solder damage, overheating, shorts, or damaged surrounding components.
Step 5: Check the Main IC Supply
Verify that the BP03006-56A4 section receives the required supply conditions from the board's power system.
Step 6: Check the Crystal Circuit
Inspect the 24 MHz crystal and its nearby components when the neckband has startup or Bluetooth initialisation problems.
Step 7: Test Audio and Controls
Check the microphone, speakers, push buttons, and indicator LEDs individually instead of assuming that one failure represents a complete motherboard failure.
Step 8: Compare With a Known-Good Board
For difficult faults, comparing voltage readings, resistance measurements, component values, and signal paths with a known-good board of the same revision can greatly reduce unnecessary component replacement.
Aroma Neckband Component Reference
| Section | Identified Part | Reported Specification |
|---|---|---|
| Main PCB | LC6956A | T1_V2.0(LC6956A)-200914 |
| Main IC | BP03006-56A4 | 30 Pins |
| Crystal | 24 MHz | 4-Pin |
| Microphone | SH-018 | 2-Pin |
| Push Buttons | Tactile Switch | 3 Pieces, 4 × 4 × 0.8 mm |
| Charging IC | I50Ad88 | 5 Pins |
| Charging Input | Type-B USB | 5V |
| Charging LED | Red LED | Charging Indication |
| Bluetooth LED | Blue LED | Bluetooth Indication |
| Battery | XD 481036 | Li-Polymer, 3.7V, 200mAh |
| Battery Designation | 1ICP5/11/38 | Battery Identification |
Important Repair Considerations
The component markings in a neckband should always be verified from the actual PCB before ordering replacement parts. Markings such as BP03006-56A4 and I50Ad88 identify the parts used in the referenced board configuration, but an identical-looking component from another board is not automatically a drop-in replacement.
The same principle applies to the battery. Voltage, polarity, dimensions, capacity, connector arrangement, and protection requirements should all be checked before installation.
For board-level repair, accurate measurement is more reliable than replacing several components based only on the symptom. A multimeter, continuity testing, a controlled power supply, magnification, and a known-good reference board can be more valuable than simply changing the main IC.
Note: Use these component details as a repair reference and verify the exact PCB revision and markings before replacing any component.
Disclaimer: Component specifications and model associations are based on the referenced board information and may vary by production batch, PCB revision, or firmware; verify the actual hardware before repair or replacement.
