• 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?

⟐ Edited by author May 28, 2026 at 5:48 MST

⟐ Commented May 28, 2026 at 3:13 MST

I was doing some calculations on my TI 5660 and mid calculation, the printer stopped, it displays an error (E and 0). I checked to see if the paper got jammed, or if the ink ribbon is stuck and both move freely. When I tried to reset the error, the printer makes a buzzing noise and the error is not cleared. Does anyone have any ideas how to fix this? Thanks in advance.

⟐ Edited by author May 27, 2026 at 15:16 MST

⟐ Answered May 27, 2026 at 11:55 MST

⟐ Commented May 27, 2026 at 11:47 MST

I’m looking for help with a possibly soft-bricked ZOYI/Zotek ZT-703S oscilloscope multimeter.

Symptoms:

• The device powers on normally
• It immediately enters oscilloscope mode
• The oscilloscope itself still works and reads signals correctly
• However, all front buttons become unresponsive in the main UI

What is interesting:

• The buttons DO work in bootloader/USB mode
• POWER + F1 during startup successfully enters USB mode
• F2 successfully exits USB mode

I also have the known “RAM” USB issue:

• The device appears as “RAM” over USB
• Reduced storage size is shown
• Larger firmware files no longer fit

I already tried multiple official firmware versions, but the issue persists.

After researching EEVBlog and the abandoned open-zt703 project, I suspect:

• corrupted persistent settings/filesystem,
• corrupted internal flash state,
• or a firmware/UI crash when restoring oscilloscope settings at boot.

Important findings:

• The STM32 SWD interface appears to still be enabled
• The open-source project documentation mentions:
  • full chip erase,
  • filesystem recreation,
  • settings reset,
  • and recovery through ST-Link + STM32CubeProgrammer

At this point I’m considering buying an ST-Link V2 and attempting recovery through SWD.

Before I do that, I wanted to ask:

• Has anyone successfully recovered a ZT-703S from this exact state?
• Is there a known way to reset only the settings/filesystem area?
• Does a full chip erase also destroy the original bootloader permanently?
• Has anyone dumped the original flash/bootloader?

Any advice would be greatly appreciated.


Video demostration https://www.youtube.com/shorts/B2H7HaynO...

⟐ Edited by author May 27, 2026 at 10:43 MST

⟐ Answered May 27, 2026 at 8:45 MST

Secret cards name is lnv55L96c made by Samsung.

***

there is a secret card under metal sheaild***

Toshiba 55sv685d

What ist the problem? I love this tv. Can you help me please?

bDys23xvRHKQVJfZ.full (4000×3000) https://share.google/YsSsvDXFM1pmCy4sN

⟐ Answer unaccepted May 27, 2026 at 10:14 MST

⟐ Answered May 26, 2026 at 21:26 MST

⟐ Answered May 26, 2026 at 20:47 MST

⟐ Commented May 26, 2026 at 16:55 MST

Any recommendation or teardown fixes for it? I tried to push it back in, but i cant be fully inserted.

⟐ Commented May 26, 2026 at 11:12 MST

Nothing seems to be physically snapped or broken, but I can't just slide it back in. It feels like there is an internal plastic stopper or clip blocking it from re-entering the slot. I really want it to click back into place and adjust normally.

Since the Kraken Ultimate headband doesn't have the standard visible screws under the cushion like the regular Krakens, how can I safely force or snap the metal arm back into the track without breaking the internal wiring or splitting the plastic housing?

Any advice or tricks would be greatly appreciated. Thanks!

⟐ Commented May 26, 2026 at 10:26 MST