PAX A920 Android System Recovery: DNS Configuration... | terminalfaults.org

Technical Background:

Android System Recovery indicates a system-level failure. DNS resolution relies on the network interface controller (NIC) to communicate with a DNS server. Potential failure points include corrupted network configuration files, incorrect DNS server addresses, or a faulty NIC. Electrical Overstress (EOS) events due to static discharge can damage the NIC. Signal attenuation from cable damage or EMI can disrupt network communication. The A920 likely uses DHCP for automatic DNS configuration, but a static IP could be set. Bootloader corruption could also trigger recovery mode.

Symptoms:

Device displays 'Android System Recovery' screen. Network connectivity failure indicated by inability to resolve domain names (DNS issue).

Possible Causes:

Incorrect DNS server address configured in the network settings.
Corrupted network configuration files within the Android operating system.
DHCP server is not providing a valid DNS server address.
Faulty network interface controller (NIC) due to static discharge (ESD) or physical damage.
Intermittent network connectivity due to cable strain or electromagnetic interference (EMI).
Operating system files have been corrupted causing boot failure.

Solution:

1

Safe Handling: Disconnect the PAX A920 from its power source and network cable.
2

Inspect Network Cable: Examine the network cable for any signs of physical damage, such as cuts or bends. Replace if damaged.
3

Verify Network Connectivity: Connect a different device (e.g., laptop) to the same network cable and test network connectivity and DNS resolution.
4

Reboot the PAX A920: Reconnect the power source and allow the device to attempt a normal boot. Observe if the 'Android System Recovery' screen persists.
5

Access Network Settings: If the device boots, navigate to the network settings (usually under Settings > Wi-Fi or Ethernet). Verify the DNS server addresses. Change to a public DNS server (e.g., 8.8.8.8 and 8.8.4.4) for testing.
6

Factory Reset (Data Loss Warning): If the device remains in recovery, perform a factory reset from the Android System Recovery menu. This will erase all data on the device.
7

Contact Support: If the issue persists after a factory reset, contact PAX support for further assistance. Do not attempt to open the device.

Safety Warning:

Avoid opening the PAX A920 casing. Doing so will likely trigger the internal anti-tamper mechanisms and render the device unusable. Static discharge can damage electronic components. Ground yourself before touching the device. Ensure the device is placed on a stable and dry surface to prevent accidental falls and liquid spills. Safe Handling: Unplug the device from the power source before any physical inspection or cleaning.

Prevention:

Implement cable strain relief measures to prevent damage to the network cable. Use a surge protector to protect the device from power surges. Clean the touchscreen regularly with a dry, lint-free cloth. Ground yourself before touching the device, especially in dry environments, to prevent ESD.

Expert Tip:

If the device is configured for a static IP address, note that the Android System Recovery screen sometimes displays a generic error message even when the IP configuration itself is the root cause. Use the bootloader menu to view/reset IP settings without fully booting the OS, if possible. In some cases, a network loop can cause DNS resolution to fail; ensure that there are no redundant network connections or spanning tree protocol issues on the network.

Frequently Asked Questions

•Is the device under warranty?

Check the device's warranty status. If under warranty, contact PAX support before attempting any troubleshooting.

•Has the device been physically damaged or exposed to liquids?

Physical damage or liquid exposure can cause internal component failure and network connectivity issues.

•Are other devices on the same network experiencing DNS resolution problems?

If other devices are affected, the problem may be with the network's DNS server or internet connection.

PAX A920 Android System Recovery: DNS Configuration Diagnostic Report

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Is the device under warranty?

•Has the device been physically damaged or exposed to liquids?

•Are other devices on the same network experiencing DNS resolution problems?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: