JBL xtreme 2 do not charge.

? OFB TI 041 A4N4 = BQ24610 BQ24617 ?
https://www.ti.com/lit/ds/symlink/bq24617.pdf?ts=1670179931771&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fen-us%252Fdocs%252Funiversalsearch.tsp%253FlangPref%253Den-US%2526searchTerm%253DOFB%2BTI%2526nr%253D3

New battery (accumulator).

Extern power <= 8,4 VDC constant current (CC) ca 300 mA charging accumulator and constant voltage (CV) charging.

Accumulator reach full charge after x hours if extern power unit charging the accumulator.

Battery (Accumulator) reach NOT full charge from motherboard.

Maybe problem with the motherboard´s switching unit charger for the accumulator?

I hear a high frequency sound from the motherboard sometimes when the adapter plug-in is connected to the JBL xtreme 2.
Maybe the BATFET is switching and overcurrent (input current regulation) appear
or buck is operating simultaneous as the BATFET is switching?

Is Q1 (ACFET) SI7617DN and Q2 (ACFET) SI7616DN replaced by a 3 Amp Schottky Rectifier SK34A D21?
RAC 0,010 ohm R212 is as www.ti.com´s recommendation 10.2 Typical Applications 10.2.1 System with Power Path

Maybe the solution of the problem "JBL xtreme 2 do not charge" is:
REGN LDO has 0 volt at pin 18. The correct level is 6 V.

9.3.7 Enable and Disable Charging
The following conditions must be valid before charge is enabled:
• CE is HIGH.
• The device is not in undervoltage lockout (UVLO) and not in VCCLOWV mode.
• The device is not in SLEEP mode.
• The VCC voltage is lower than the AC overvoltage threshold (VCC < VACOV).
• 30-ms delay is complete after initial power up.
• The REGN LDO and VREF LDO voltages are at the correct levels.
• Thermal shut (TSHUT) is not valid.
• TS fault is not detected.
One of the following conditions will stop ongoing charging:
• CE is LOW.
• Adapter is removed, causing the device to enter UVLO, VCCLOWV, or SLEEP mode.
• Adapter is over voltage.
• The REGN or VREF LDO is overloaded.
• TSHUT IC temperature threshold is reached (145°C on rising edge with 15°C hysteresis).
• TS voltage goes out of range, indicating the battery temperature is too hot or too cold.
• TTC safety timer out

Linear & low-dropout (LDO) regulators: https://www.ti.com/power-management/linear-regulators-ldo/overview.html
Maybe a problem with the REGN 6 V LDO:
9.3.7 Enable Charging
• The REGN LDO and VREF LDO voltages are at the correct levels.

REGN LDO has 0 volt at pin 18. The correct level is 6 V. D1 and C5 is ok, maybe.

REGN REGULATOR
VREGN_REG REGN regulator voltage VVCC > 10 V, CE = HIGH, (0- to 40-mA load) 5.7 6 6.3 V
IREGN_LIM REGN current limit VREGN = 0 V, VVCC > VUVLO, CE = HIGH 40 mA

9.3.8 System Power Selector
The break-before-make logic keeps both ACFET and BATFET off for 10 µs before ACFET turns on.
This prevents shoot-through current or any large discharging current from going into the battery.

9.3.20 PG Output
The open-drain PG (power-good) output indicates whether the VCC voltage is valid or not.
The open-drain FET turns on whenever BQ2461x has a valid VCC input (not in UVLO or ACOV or SLEEP mode).
The PGpin can be used to drive an LED or communicate to the host processor

9.3.22 Charge Status Outputs
The open-drain STAT1 and STAT2 outputs indicate various charger operations as shown in the Table 2.
These status pins can be used to drive LEDs or communicate with the host processor.
OFF indicates that the opendrain transistor is turned off.
Table 2. STAT Pin Definition for BQ2461x
CHARGE STATE STAT1 STAT2
Charge in progress ON OFF
Charge complete OFF ON
Charge suspend, timer fault, overvoltage, sleep mode, battery absent OFF OFF

PROG 20 AI
Charger POR Default Settings Program – At power up, the charger detects the resistance tied to
PROG pin to determine the default switching frequency and the default battery charging profile.
The surface mount resistor with ±1% or ±2% tolerance is recommended.
Please refer to more details in the section of PROG Pin Configuration.

JBL_xtreme_2_do_not_charge_1.3gp
JBL_xtreme_2_do_not_charge_2.3gp
JBL_xtreme_2_do_not_charge_3.3gp
JBL_xtreme_2_do_not_charge_4.3gp

Is the JBL xtreme 2 fault-tolerant?

The Tolerant Engineer by Bill Marshall / https://www.rs-online.com/

Component Tolerancing

Tolerating Faults

Electromagnetic Interference & RF Emissions Compliance

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Etc.

You must be a member to read this following article:

https://www.rs-online.com/designspark/the-tolerant-engineer?cm_mmc=SE-EM-_-DSN_20170717-_-DM67156-_-BOX2_URL1&cid=DM67156&bid=350426701

Is Sony better?

No more JBL. After the warranty period or some years JBL xtreme 2 did not charge and the warranty is not valid any more...