I have an APU1D4 running for more than 1 year without any problems.
After a cold reboot (shutdown, disconnect cable from the power supply, wait a few minutes and reconnect to power supply), the LEDs were blinking at the beginning but no BIOS or OS writes to UART. But I realized that something beeps inside of my APU1D4. It's the buzzer BU1 that beeps every 1/4 second, no LEDs are blinking anymore and the power input PWR drops to 5.3V - 5.5V. When the power supply has no load, he brings 12V.
- buzzer BU1 beeps every 1/4 second.
- no LEDs are blinking.
- power input PWR has a voltage between 5.3V and 5.5V.
- the power supply (originally from PC Engines) without load brings 12V.
Is there anyone that had the same problem? How did you resolve the problem?