If you accidentally swap the GND wire with a data line, or if the CMD / CLK lines are cross-wired to a power plane, massive cross-currents will flow. Furthermore, if you power the eMMC via the programmer but forget to tie the target board's main ground ( GND ) to the Postal3 programmer's ground, current will try to find an alternative return path through the data pins ( D0 ), causing immediate overheating.
It's entirely possible that the eMMC chip itself is faulty. Users on the forum-monitor.net forum have discussed this exact scenario. When encountering an unresponsive or busy eMMC, one developer commented: "Скорее всего eMMC дохлая" (Most likely, the eMMC is dead). A short circuit within the chip's internal components can cause it to overheat instantly. This is especially common if the chip was subjected to physical stress, excessive voltage, or a previous overheating episode. The failure of the eMMC's internal components, such as the power management circuits, can lead to a direct short between the Vcc and ground lines inside the chip, causing the chip to heat up rapidly as soon as power is applied. postal3 emmc hot
When a technician searches for "postal3 emmc hot," they are typically dealing with an eMMC chip that has become "read-only" or has a corrupted boot partition. The "hot" aspect usually involves one of two scenarios: If you accidentally swap the GND wire with
Technicians use the Postal 3 to perform several low-level operations on eMMC/eMCP chips: Users on the forum-monitor
: Instead of using the Postal 3 to power the eMMC, leave the programmer's VCCcap V sub cap C cap C end-sub
If you see the "restart eMMC power" log, physically disconnect and reconnect the chip's power source before trying again .
: Ensure the programmer's logic levels match the board. Sending 3.3V into a 1.8V eMMC line can cause permanent hardware failure.