X728: Difference between revisions

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Q12: Simulate power outage and reconnection scenario. Why does the Raspberry Pi fail to ~~reboot~~ after unplugging and reconnecting the power supply?

Q12: Simulate power outage and reconnection scenario. Why does the Raspberry Pi fail to auto boot after unplugging and reconnecting the power supply?

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A: ~~The~~ Raspberry Pi fails to ~~reboot~~ after power reconnection due to '''<span class="tb_red">incomplete power discharge</span>'''.

A: In the process of X728 auto power-on test, the Raspberry Pi fails to auto boot after power reconnection due to '''<span class="tb_red">incomplete power discharge</span>'''. This issue usually occurs when cutting power by unplugging the power adapter, while it will not happen if you disconnect the USB port directly.

:'''1. Cause'''

:~~Onboard capacitors hold residual~~ power after ~~power~~ disconnection, ~~leaving~~ voltage at the X728 input terminal. ~~Instant reconnection cannot~~ fully ~~break~~ the ~~power~~ circuit, so the ~~reboot mechanism will not~~ be ~~activated~~.

:Residual charge remains in the power adapter after disconnection, keeping voltage present at the X728 input terminal. Reconnecting power immediately fails to fully cut off the circuit, hence the auto power-on function cannot be triggered.

:'''2. Discharge Completion Check (refer to the picture)'''

:~~Discharge duration differs among power adapters.~~ Measure voltage on X728 input pads; the power is fully discharged when the voltage drops to zero. It generally takes ~~about 20~~ seconds.

:Measure voltage on X728 input pads; the power is fully discharged when the voltage drops to zero. It generally takes over 30 seconds (discharge duration differs among power adapters).

:[[File:X728-FAQ.jpg|700px]]

~~:'''3. Operating Steps'''~~

~~::3.1 Cut off the external power supply~~

~~::3.2 Stand by until input pad voltage reaches zero (Better wait several extra seconds)~~

~~::3.3 Reconnect power, the Raspberry Pi will reboot automatically as normal~~

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 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q12: Simulate power outage and reconnection scenario. Why does the Raspberry Pi fail to reboot after unplugging and reconnecting the power supply?
+Q12: Simulate power outage and reconnection scenario. Why does the Raspberry Pi fail to auto boot after unplugging and reconnecting the power supply?
 </div>
 <div class="mw-collapsible-content">
-A: The Raspberry Pi fails to reboot after power reconnection due to '''<span class="tb_red">incomplete power discharge</span>'''.
+A: In the process of X728 auto power-on test, the Raspberry Pi fails to auto boot after power reconnection due to '''<span class="tb_red">incomplete power discharge</span>'''. This issue usually occurs when cutting power by unplugging the power adapter, while it will not happen if you disconnect the USB port directly.
 :'''1. Cause'''
-:Onboard capacitors hold residual power after power disconnection, leaving voltage at the X728 input terminal. Instant reconnection cannot fully break the power circuit, so the reboot mechanism will not be activated.
+:Residual charge remains in the power adapter after disconnection, keeping voltage present at the X728 input terminal. Reconnecting power immediately fails to fully cut off the circuit, hence the auto power-on function cannot be triggered.
 :'''2. Discharge Completion Check (refer to the picture)'''
-:Discharge duration differs among power adapters. Measure voltage on X728 input pads; the power is fully discharged when the voltage drops to zero. It generally takes about 20 seconds.
+:Measure voltage on X728 input pads; the power is fully discharged when the voltage drops to zero. It generally takes over 30 seconds (discharge duration differs among power adapters).
 :[[File:X728-FAQ.jpg|700px]]
-:'''3. Operating Steps'''
-::3.1 Cut off the external power supply
-::3.2 Stand by until input pad voltage reaches zero (Better wait several extra seconds)
-::3.3 Reconnect power, the Raspberry Pi will reboot automatically as normal
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 </div>