Any help will be appreciated! Attaching few images for an idea.

Thanks.

⟐ Commented novembro 18, 2025 at 3:40 GMT-7

I have a LG Xboom GO XG7QBK that doesn't "work":

• After pressing the power button the power led turns on.
  • Pressing it again doesn't turn it off.
  • No sound output (beeps or whatever on startup, buttons)
  • I can hard reset it (7sec power + boost button) after which the devices turns off, but doesn't solve the issue
• Can't put in BT Pairing mode
• When plugging in the charger, no battery led indications.
  • The device turns on with the battery only, charger disconnected.
  • The device turns on with charger plugged in, battery disconnected.
  • The device turns on with both connected
• Pressing the power and volume up/down for two seconds make the power led blink 4 times, to turn on/off "auto power management".
• If i connect it to the wall, and then use a cable to connect my phone, it charges the phone.
• After opening it up:
  • Replaced the cable that connects the buttons to main board (damaged it while disassembling, replaced it just to be sure), no change in behaviour
  • When pressing BT + Play/Pause for two seconds, all leds (colours+power+Boost+Bluetooth) start blinking except for the battery leds. Colours stop after 1min or so.
    • When in this state i can't convince the device to hard reset. Need to remove power source to "turn off".

Pictures of the motherboard, no apparent damage, ill review all components when i have a magnifier.

Any suggestions on next steps to diagnose?

Update:

Ive been using the fixbot do diagnose and check some stuff, and came to the following conclusion:

My LG Xboom Go XG7QBK powers on (Power LED is on), but it is "frozen" or "soft-bricked."

There is no audio, the Bluetooth/Reset buttons do not respond, and it won't produce any sound. I have performed deep troubleshooting on the main board (EBR37418701) and found the following:

• Main Power (PVDD) at the TAS5822M amp (Pins 6/7) is 7.38V (Normal).
• Logic Power (DVDD) at Pin 9 is 3.39V (Normal).
• The Reset pin (MRST) on the Bluetooth daughterboard is 3.2V (High/Normal).
• **CRITICAL:** The I2C bus (Pins 11 and 12 on the TAS5822M) is sitting at 0V, but shows high resistance to ground (no short).
• **CRITICAL:** Pin 29 (PDN) on the amp is at 0V, meaning the MCU is keeping the amp in shutdown mode.

It seems the Bluetooth module/MCU is powered and not in hardware reset, but it is failing to initialize the I2C bus or execute its boot sequence. I have already tried a battery disconnect and holding the power button to drain capacitors. Is there a known "Force Boot" or "Firmware Recovery" key combination or a specific test point to jump to force a firmware reload on this model? Or does this indicate a failure of the MCU/Flash memory on the daughterboard?

⟐ Edited by author maio 29, 2026 at 12:54 GMT-7