Before attempting any advanced solutions, try these basic troubleshooting steps:
For technicians: If the phone shows no signs of life, connect a USB-to-UART adapter to the test points on the motherboard. If you see no serial output, the CPU or eMMC (storage chip) is not powering up.
| Test | Result | |------|--------| | Power on/off | Pass | | Charging (USB & wall) | Pass | | USB data transfer | Pass | | 24-hour burn-in test (no reboot) | Pass |