X728: Difference between revisions

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[[File:X728-V2.1-interface-EN.jpg|thumb|right|X728 V2.1 Interface]]

[[File:X728-V2.1-Jumper cap function.jpg|thumb|right|X728 V2.1 Jumper Cap Function]]

[[File:X728-V2.1-packing-list.jpg|thumb|right|X728 V2.1 packing list]]

[[File:X728-V2.0-IMG-0445-Jumper.jpg|thumb|right|X728 V2.0 Jumper cap function]]

[[File:IMG 9490-Interface.jpg|thumb|right|X728 ups board-Interface]]

[[File:IMG 9490-Interface.jpg|thumb|right|X728 V1.3 ups board-Interface (Product Discontinued)]]

[[File:X728-IMG-7976-跳线说明.jpg|thumb|right|X728 V1.3 ups board-Jumper cap function]]

[[File:X728-IMG-~~7975~~.jpg|thumb|right|X728 ~~ups board~~]]

[[File:X728-IMG-7960-1.jpg|thumb|right|X728 V1.2 Interface]]

[[File:X728-IMG-7957.jpg|thumb|right|X728 v1.2 ups board-Back]]

[[File:X728-IMG-7957.jpg|thumb|right|X728 v1.2 ups board-Back (Product Discontinued)]]

[[File:X728-IMG-7975.jpg|thumb|right|X728 v1.2 ups board]]

[[File:X728-A1-IMG-8199-Packing-List.jpg|thumb|right|X728-A1 Packing List]]

[[File:X728-A2-IMG-8211-Packing-List.jpg|thumb|right|X728-A2 Packing List]]

[[File:01-IMG-3946-main.jpg|thumb|right|X728-C1 metal case for X728 V2.x/x735/x708]]

[[File:IMG-3916-acce.jpg|thumb|right|x728-c1 Accessories]]

[[File:X728-PCB.png|thumb|right|X728 V1.3 PCB Layout]]

[[File:X728-PCB.png|thumb|right|X728 V1.3 PCB Layout (Product Discontinued)]]

[[File:X728_V2.0_PCB_Layout.jpg|thumb|right|X728 V2.0 PCB Layout]]

[[File:X728-V2.1-PCB.png|thumb|right|X728 V2.1 PCB Layout]]

==Safety Instructions & Warnings==

==Overview==

'''[NOTE]''': X728 supports also Raspberry Pi 5 hardware, the installation script is updated. Refer to [[X728-script]]

'''[NOTE]''':

X728 supports also Raspberry Pi 5 hardware, the installation script is updated. Refer to [[X728-script]], If you have any problems with RPi5, please refer to [[#FAQ]]: Q1

The X728 is an advanced uninterruptible power supply expansion board for all current models of the Raspberry Pi using a 40 pin header.

It provides 5.1V ~~6000mA~~ Power Backup for even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown，AC power loss/ power adapter failure detection , auto power-on, full poweroff from software, battery capacity reading, and a real- time clock(RTC), buzzer alarm.

It provides 5.1V 5000mA Power Backup for even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown，AC power loss/ power adapter failure detection , auto power-on, full poweroff from software, battery capacity reading, and a real- time clock(RTC), buzzer alarm.

The X728 reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards for enhanced applications. The X728 can also be used with the [[X825]]/[[X828]]/[[X829]] (2.5" HDD/SSD Shield) and [[X857]]/[[X862]]/[[X872]] (MSATA/M.2 SSD shield) for safe data backup.

Video Test Max 5.1V ~~6000mA~~ Output: https://youtu.be/m_oIDrMEp0U

Video Test Max 5.1V 5000mA Output: https://youtu.be/m_oIDrMEp0U

<span style="color:red;"> Note: X708, X703 UPS '''does not support''' Raspberry Pi 5.

----

'''Geekworm UPS Series for Raspberry Pi 5'''

==Update History==

Line 76:

Line 86:

* Remove the hardware ASD function and change it to software implementation

* The charging power indicator (LED1-LED4) is relatively brighter than V1.2.

~~==SAFETY INSTRUCTIONS AND WARNINGS==~~

* <span style="color:red;">You must read these safety instructions and warnings before charging your batteries.

* <span style="color:red;">Lithium Polymer and Li-ion batteries are volatile. Failure to read and follow the below instructions may result in fire, personal injury and damage to property if charged or used improperly.

* <span style="color:red;">Never make wrong polarity connection when charging and discharging battery packs. Always double check polarity of battery's connector to make sure "+" to "+" and "-" to "-".

* <span style="color:red;">Do not mix and use old batteries and new batteries, or batteries with different brand names.

* <span style="color:red;">Lithium batteries has it's cycle life, please replace old battery with new one when it reaches it's service life or when it is two year old, whichever comes first.

* <span style="color:red;">When charging Battery Pack, please put battery in a fire proof container. Please don't leave the X728 on the wood material or carpet and unattended.

* <span style="color:red;">Must keep the X728 away from children.

*Please watch Main Video and Tutorial Video regarding 18650 batteries at: https://www.staysafebattery.com/en/

* Battery Recommend for X728 board, please refer to: [[File:NCR18650B.pdf|X728 battery recommend]]

==Features==

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* Smart and powerful Uninterruptible Power Supply (UPS)

* Provides continuous operations for up to 10~30hours (depending on battery type and qty used)

* Max 5.1V ~~6000mA~~ Power Backup for even the most demanding RPi set ups

* Max 5.1V 5000mA Power Backup for even the most demanding RPi set ups

* Can work with [[X728#X728-A2|X728-A2]] 2-cell battery holder'''(discontinued)''' / [[X708-A1]] 8-cell battery holder to increase battery capacity

* Supports 3000mA fast battery charging

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* Powers the Raspberry Pi via the 40-pin header - no additional cabling required

* On-board DC power jack (5.5*2.~~5mm~~) and Type-C socket convenient for power input

* On-board DC power jack (5.5*2.1mm) and Type-C socket convenient for power input

* On-board PH2.0 connector allows to connect external power switch and DIY your perfect case

* On-board XH2.54 power output connector allows to power other devices

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===SPECIFICATION===

* Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack : 5Vdc ±5%, ≥4A

* Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack 5521 : 5Vdc ±5%, ≥4A

* UPS output : 5.1V ±5% Max 6A

* UPS output : 5.1V ±5% Max 5A

* UPS charging current: 2.3~3.2A

* Terminal Battery Voltage : 4.24V

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* Power via DC5521 Jack of X728, 5.1Vdc +/-5% , ≥4A (DC5525 Jack is compatible with DC5521, also support 5V PSU with DC5525 Jack)

* Power via USB Type-C port of X728, 5.1Vdc +/-5% , ≥3A (Geekworm Type-C 5V 4A 20W power supply is recommended.）

==User manual==

* [[X728-script]]: This is script installation tutorial for X728 shield

* [[x728-hardware]]: Provides some hardware parameter information.

==Packing List==

* X728 Expansion Board x 1

* Screw M2.~~5 *5mm~~ x 8

* Screw M2.5x5mm x 8

* Spacer M/F M2.~~5 *20mm~~ x 4

* Spacer M/F M2.5x20+6mm x 4

* Spacer F/F M2.~~5 *20mm~~ x 4

* Spacer F/F M2.5x20mm x 4

* Jumper link Pitch 2.54mm x 2

[[File: IMG-0449-Packing-List.jpg|600px]]

~~==User manual==~~

* [[X728-script]]: This is script installation tutorial for X728 shield

* [[x728-hardware]]: Provides some hardware parameter information.

==X728-C1==

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==X728-A1==

<span style="color:red;font-weight:bold">X728-A1 Optional Raspberry Pi cooling fan</span>

<span style="color:red;font-weight:bold">X728-A1 Optional Raspberry Pi cooling fan</span>（'''Discontinued'''）

* Completely solve the overheating problem of your Raspberry Pi

* Efficient drop temp of your Raspberry Pi by using the X728-A1

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==X728-A2==

<span style="color:red;font-weight:bold">X728-A2 Optional 18650 2-Cell battery holder</span>

<span style="color:red;font-weight:bold">X728-A2 Optional 18650 2-Cell battery holder</span>（'''Discontinued'''）

* Stackable 18650 two cells lithium Ion holder

* Ideal solution to increase battery capacity

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Q: Why Raspberry Pi is randomly rebooting all the time?

Q1: Why does the message "This power supply is not capable of supplying 5A" appear on '''RPi 5'''??

</div>

[[X728]]/[[X729]] UPS shield can provide '''enough 5A''' power supply capacity;

Please set as follows:

'''Step 1''': (Required)

Open the Teminal window based on '''Raspberry Pi OS''' and execute the following command:

sudo rpi-eeprom-config -e

Add <code>PSU_MAX_CURRENT=5000</code> at the end of the file that reads like this:

[[File:X1012-setting.png|700px]]

Press '''Ctrl-O''', then enter, to write the change to the file.

Press '''Ctrl-X''' to exit nano (the editor).

'''Step 2''': (Optional, if you use USB peripherals and require higher current)

Set <code>usb_max_current_enable=1</code> in '''/boot/firmware/config.txt'''

'''Reboot''' your Raspberry Pi 5 to make the change take effect.

'''Note:''' If you are using other OS like Ubuntu, please flash '''Raspberry Pi OS''' first, and then re-flash other OS such as Ubuntu etc after completing the above settings.

</div>

Q2: Why Raspberry Pi is randomly rebooting all the time?

</div>

Line 231:

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Q: Why the X728 V1.3 remove the ASD function?

Q3: Why the X728 V1.3 remove the ASD function?

</div>

Line 240:

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Q: How to restart the pi board when AC Power supply is connected?

Q4: How to restart the pi board when AC Power supply is connected?

</div>

Line 249:

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Q: Which GPIO is used to power the X728-A1 cooling fan?

Q5: Which GPIO is used to power the X728-A1 cooling fan?

</div>

Line 258:

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Q: Are the batteries on X728 hot-swappable? In other words, can I connect an external power supply and swap the batteries out while that is on?

Q6: Are the batteries on X728 hot-swappable? In other words, can I connect an external power supply and swap the batteries out while that is on?

</div>

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Q: Does the rtc have a separate battery? or does it run on the 18650 batteries? what happens if you remove them? will it "lose" time?

Q7: Does the rtc have a separate battery? or does it run on the 18650 batteries? what happens if you remove them? will it "lose" time?

</div>

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Q: What will lead to the X728 board be burnt out?

Q9: What will lead to the X728 board be burnt out?

</div>

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Q: What frequency does X728 use in the I2C communication bus used to communicate with RPI?

Q10: What frequency does X728 use in the I2C communication bus used to communicate with RPI?

</div>

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Q: What the maximum current rating of X728-A1 is?

Q11: What the maximum current rating of X728-A1 is?

</div>

A: The maximum current rating of X728-A1 is 90MA.

</div>

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

</div>

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'''

: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)'''

:Measure the voltage on the X728 DC jack input pads. The auto power-on function will be invalid if the reading is non-zero. Full discharge is achieved when voltage falls to zero, which usually takes more than 30 seconds. Discharge time varies depending on different power adapters.

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

</div>

<~~comments~~ />

<comment-streams id="main" />

[[Category:Product Manual]]

[[Category:Raspberry pi]]

@@ Line 4: / Line 4: @@
 [[File:X728-V2.1-interface-EN.jpg|thumb|right|X728 V2.1 Interface]]
 [[File:X728-V2.1-Jumper cap function.jpg|thumb|right|X728 V2.1 Jumper Cap Function]]
-[[File:X728-V2.1-packing-list.jpg|thumb|right|X728 V2.1 packing list]]
+<!-- [[File:X728-V2.1-packing-list.jpg|thumb|right|X728 V2.1 packing list]] -->
 [[File:X728-V2.0-IMG-0445-Jumper.jpg|thumb|right|X728 V2.0 Jumper cap function]]
-[[File:IMG 9490-Interface.jpg|thumb|right|X728 ups board-Interface]]
+[[File:IMG 9490-Interface.jpg|thumb|right|X728 V1.3 ups board-Interface (Product Discontinued)]]
 [[File:X728-IMG-7976-跳线说明.jpg|thumb|right|X728 V1.3 ups board-Jumper cap function]]
-[[File:X728-IMG-7975.jpg|thumb|right|X728 ups board]]
+[[File:X728-IMG-7960-1.jpg|thumb|right|X728 V1.2 Interface]]
-[[File:X728-IMG-7957.jpg|thumb|right|X728 v1.2 ups board-Back]]
+[[File:X728-IMG-7957.jpg|thumb|right|X728 v1.2 ups board-Back (Product Discontinued)]]
+[[File:X728-IMG-7975.jpg|thumb|right|X728 v1.2 ups board]]
 [[File:X728-A1-IMG-8199-Packing-List.jpg|thumb|right|X728-A1 Packing List]]
 [[File:X728-A2-IMG-8211-Packing-List.jpg|thumb|right|X728-A2 Packing List]]
 [[File:01-IMG-3946-main.jpg|thumb|right|X728-C1 metal case for X728 V2.x/x735/x708]]
 [[File:IMG-3916-acce.jpg|thumb|right|x728-c1 Accessories]]
-[[File:X728-PCB.png|thumb|right|X728 V1.3 PCB Layout]]
+[[File:X728-PCB.png|thumb|right|X728 V1.3 PCB Layout (Product Discontinued)]]
 [[File:X728_V2.0_PCB_Layout.jpg|thumb|right|X728 V2.0 PCB Layout]]
 [[File:X728-V2.1-PCB.png|thumb|right|X728 V2.1 PCB Layout]]
 {{GD Template Impl}}
+==Safety Instructions & Warnings==
+{{UPS Safety Warning}}
 ==Overview==
-'''[NOTE]''': X728 supports also Raspberry Pi 5 hardware, the installation script is updated. Refer to [[X728-script]]
+'''[NOTE]''':
+X728 supports also Raspberry Pi 5 hardware, the installation script is updated. Refer to [[X728-script]], If you have any problems with RPi5, please refer to [[#FAQ]]: Q1
 The X728 is an advanced uninterruptible power supply expansion board for all current models of the Raspberry Pi using a 40 pin header.
-It provides 5.1V 6000mA Power Backup for even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown，AC power loss/ power adapter failure detection , auto power-on, full poweroff from software, battery capacity reading, and a real- time clock(RTC), buzzer alarm.
+It provides 5.1V 5000mA Power Backup for even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown，AC power loss/ power adapter failure detection , auto power-on, full poweroff from software, battery capacity reading, and a real- time clock(RTC), buzzer alarm.
 The X728 reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards for enhanced applications. The X728 can also be used with the [[X825]]/[[X828]]/[[X829]] (2.5" HDD/SSD Shield) and [[X857]]/[[X862]]/[[X872]] (MSATA/M.2 SSD shield) for safe data backup.
-Video Test Max 5.1V 6000mA Output: https://youtu.be/m_oIDrMEp0U
+Video Test Max 5.1V 5000mA Output: https://youtu.be/m_oIDrMEp0U
 <span style="color:red;"> Note: X708, X703 UPS '''does not support''' Raspberry Pi 5.
+----
+'''Geekworm UPS Series for Raspberry Pi 5'''
+{{Raspberry Pi 5 UPS Sets}}
 ==Update History==
@@ Line 76: / Line 86: @@
 * Remove the hardware ASD function and change it to software implementation
 * The charging power indicator (LED1-LED4) is relatively brighter than V1.2.
-==SAFETY INSTRUCTIONS AND WARNINGS==
-* <span style="color:red;">You must read these safety instructions and warnings before charging your batteries.
-* <span style="color:red;">Lithium Polymer and Li-ion batteries are volatile. Failure to read and follow the below instructions may result in fire, personal injury and damage to property if charged or used improperly.
-* <span style="color:red;">Never make wrong polarity connection when charging and discharging battery packs. Always double check polarity of battery's connector to make sure "+" to "+" and "-" to "-".
-* <span style="color:red;">Do not mix and use old batteries and new batteries, or batteries with different brand names.
-* <span style="color:red;">Lithium batteries has it's cycle life, please replace old battery with new one when it reaches it's service life or when it is two year old, whichever comes first.
-* <span style="color:red;">When charging Battery Pack, please put battery in a fire proof container. Please don't leave the X728 on the wood material or carpet and unattended.
-* <span style="color:red;">Must keep the X728 away from children.
-*Please watch Main Video and Tutorial Video regarding 18650 batteries at: https://www.staysafebattery.com/en/
-* Battery Recommend for X728 board, please refer to: [[File:NCR18650B.pdf|X728 battery recommend]]
 ==Features==
@@ Line 101: / Line 100: @@
 * Smart and powerful Uninterruptible Power Supply (UPS)
 * Provides continuous operations for up to 10~30hours (depending on battery type and qty used)
-* Max 5.1V 6000mA Power Backup for even the most demanding RPi set ups
+* Max 5.1V 5000mA Power Backup for even the most demanding RPi set ups
 * Can work with [[X728#X728-A2|X728-A2]] 2-cell battery holder'''(discontinued)''' / [[X708-A1]] 8-cell battery holder to increase battery capacity
 * Supports 3000mA fast battery charging
@@ Line 136: / Line 135: @@
 * Powers the Raspberry Pi via the 40-pin header - no additional cabling required
-* On-board DC power jack (5.5*2.5mm) and Type-C socket convenient for power input
+* On-board DC power jack (5.5*2.1mm) and Type-C socket convenient for power input
 * On-board PH2.0 connector allows to connect external power switch and DIY your perfect case
 * On-board XH2.54 power output connector allows to power other devices
@@ Line 142: / Line 141: @@
 ===SPECIFICATION===
-* Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack : 5Vdc ±5%, ≥4A
+* Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack 5521 : 5Vdc ±5%, ≥4A
-* UPS output : 5.1V ±5% Max 6A
+* UPS output : 5.1V ±5% Max 5A
 * UPS charging current: 2.3~3.2A
 * Terminal Battery Voltage : 4.24V
@@ Line 158: / Line 157: @@
 * Power via DC5521 Jack of X728, 5.1Vdc +/-5% , ≥4A (DC5525 Jack is compatible with DC5521, also support 5V PSU with DC5525 Jack)
 * Power via USB Type-C port of X728, 5.1Vdc +/-5% , ≥3A (Geekworm Type-C 5V 4A 20W power supply is recommended.）
+==User manual==
+* [[X728-script]]:  This is script installation tutorial for X728 shield
+* [[x728-hardware]]:  Provides some hardware parameter information.
 ==Packing List==
 * X728 Expansion Board	x 1
-* Screw M2.5 *5mm	x 8
+* Screw M2.5x5mm	x 8
-* Spacer M/F M2.5 *20mm	x 4
+* Spacer M/F M2.5x20+6mm	x 4
-* Spacer F/F M2.5 *20mm	x 4
+* Spacer F/F M2.5x20mm	x 4
 * Jumper link Pitch 2.54mm x 2
 [[File: IMG-0449-Packing-List.jpg|600px]]
-==User manual==
-* [[X728-script]]:  This is script installation tutorial for X728 shield
-* [[x728-hardware]]:  Provides some hardware parameter information.
 ==X728-C1==
@@ Line 188: / Line 187: @@
 ==X728-A1==
-<span style="color:red;font-weight:bold">X728-A1 Optional Raspberry Pi cooling fan</span>
+<span style="color:red;font-weight:bold">X728-A1 Optional Raspberry Pi cooling fan</span>（'''Discontinued'''）
 * Completely solve the overheating problem of your Raspberry Pi
 * Efficient drop temp of your Raspberry Pi by using the X728-A1
@@ Line 201: / Line 200: @@
 ==X728-A2==
-<span style="color:red;font-weight:bold">X728-A2 Optional 18650 2-Cell battery holder</span>
+<span style="color:red;font-weight:bold">X728-A2 Optional 18650 2-Cell battery holder</span>（'''Discontinued'''）
 * Stackable 18650 two cells lithium Ion holder
 * Ideal solution to increase battery capacity
@@ Line 219: / Line 218: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q: Why Raspberry Pi is randomly rebooting all the time?
+Q1: Why does the message "This power supply is not capable of supplying 5A" appear on '''RPi 5'''??
+</div>
+<div class="mw-collapsible-content">
+[[X728]]/[[X729]] UPS shield can provide '''enough 5A''' power supply capacity;
+Please set as follows:
+'''Step 1''': (Required)
+Open the Teminal window based on '''Raspberry Pi OS''' and execute the following command:
+ sudo rpi-eeprom-config -e
+Add <code>PSU_MAX_CURRENT=5000</code> at the end of the file that reads like this:
+[[File:X1012-setting.png|700px]]
+Press '''Ctrl-O''', then enter, to write the change to the file.
+Press '''Ctrl-X''' to exit nano (the editor).
+'''Step 2''': (Optional, if you use USB peripherals and require higher current)
+Set <code>usb_max_current_enable=1</code> in '''/boot/firmware/config.txt'''
+'''Reboot''' your Raspberry Pi 5 to make the change take effect.
+'''Note:''' If you are using other OS like Ubuntu, please flash '''Raspberry Pi OS''' first, and then re-flash other OS such as Ubuntu etc after completing the above settings.
+</div>
+</div>
+<div class="toccolours mw-collapsible mw-collapsed">
+<div style="font-weight:bold;line-height:1.0;">
+Q2: Why Raspberry Pi is randomly rebooting all the time?
 </div>
 <div class="mw-collapsible-content">
@@ Line 231: / Line 260: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q: Why the X728 V1.3 remove the ASD function?
+Q3: Why the X728 V1.3 remove the ASD function?
 </div>
 <div class="mw-collapsible-content">
@@ Line 240: / Line 269: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q: How to restart the pi board when AC Power supply is connected?
+Q4: How to restart the pi board when AC Power supply is connected?
 </div>
 <div class="mw-collapsible-content">
@@ Line 249: / Line 278: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q: Which GPIO is used to power the X728-A1 cooling fan?
+Q5: Which GPIO is used to power the X728-A1 cooling fan?
 </div>
 <div class="mw-collapsible-content">
@@ Line 258: / Line 287: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q: Are the batteries on X728 hot-swappable? In other words, can I connect an external power supply and swap the batteries out while that is on?
+Q6: Are the batteries on X728 hot-swappable? In other words, can I connect an external power supply and swap the batteries out while that is on?
 </div>
 <div class="mw-collapsible-content">
@@ Line 267: / Line 296: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q: Does the rtc have a separate battery? or does it run on the 18650 batteries? what happens if you remove them? will it "lose" time?
+Q7: Does the rtc have a separate battery? or does it run on the 18650 batteries? what happens if you remove them? will it "lose" time?
 </div>
 <div class="mw-collapsible-content">
@@ Line 276: / Line 305: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q: What will lead to the X728 board be burnt out?
+Q9: What will lead to the X728 board be burnt out?
 </div>
 <div class="mw-collapsible-content">
@@ Line 285: / Line 314: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q: What frequency does X728 use in the I2C communication bus used to communicate with RPI?
+Q10: What frequency does X728 use in the I2C communication bus used to communicate with RPI?
 </div>
 <div class="mw-collapsible-content">
@@ Line 294: / Line 323: @@
 <div class="toccolours mw-collapsible mw-collapsed">
 <div style="font-weight:bold;line-height:1.0;">
-Q:  What the maximum current rating of X728-A1 is?
+Q11:  What the maximum current rating of X728-A1 is?
 </div>
 <div class="mw-collapsible-content">
 A: The maximum current rating of X728-A1 is 90MA.
+</div>
+</div>
+<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 auto boot after unplugging and reconnecting the power supply?
+</div>
+<div class="mw-collapsible-content">
+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'''
+: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)'''
+:Measure the voltage on the X728 DC jack input pads. The auto power-on function will be invalid if the reading is non-zero. Full discharge is achieved when voltage falls to zero, which usually takes more than 30 seconds. Discharge time varies depending on different power adapters.
+:[[File:X728-FAQ.jpg|700px]]
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 [[Category:Product Manual]]
 [[Category:Raspberry pi]]