BlackBerry shows “no network connection” when starting BlackBerry World problem solved!

Blackberry official feedback from users who have been using their Blackberry phones (Blackberry OS 10.3. The “No network connection” appears when BlackBerry World is applied. To continue, please connect to the “Settings” page. Wi-Fi or mobile networks.” Tip for the problem. The official solution to this problem is detailed below.

Problem environment.
Blackberry OS 10.3.x
BlackBerry World

Problem Description.
When launching BlackBerry World on a BlackBerry 10 smartphone, the following error message is displayed.
“No network connection to continue, please connect to Wi-Fi or mobile network in Settings.”
No Network Connection
To continue, connect to Wi-Fi or mobile network in Settings.

Problem Cause:
The BlackBerry World app needs to be updated to the latest available version before it can be accessed on a BlackBerry 10 smartphone.

Manually install BlackBerry World 5.4.0.8 from your computer to the BlackBerry 10 smartphone. To install BlackBerry World manually, complete the following steps.

On your BlackBerry 10 smartphone, enable development mode.
Tap Settings.
Click on Security and Privacy
Click to develop mode
Verify that the listed IP address is 169.254.0.1
Switch the development mode to ON.
Since you need a device password to turn on development mode, enter the device password when prompted. If the device password is not created, you will be prompted to create a
Connect your BlackBerry 10 smartphone to your computer via USB, and then complete the following steps accordingly.
Windos.

On your computer;
Ensure that Java is installed. click here for steps on how to determine if Java is installed.
Make sure the BlackBerry USB driver or BlackBerry Link is installed.
For system requirements for BlackBerry Link for Windows, click here
Download BlackBerry World – Recovery Tool 0.9, then Extract the blackberry-appworld-update-0.9 folder to your computer.
Open the extracted blackberry-appworld-update-0.9 folder.
Open/run appworld-update.bat
Enter the device password.
For security reasons, the device password is not displayed
Press Enter
After the installation is complete, result :: success will be shown. Disconnect the BlackBerry 10 smartphone from the computer.
In BlackBerry Smartphone 10, turn off the development mode by restarting the BlackBerry 10 smartphone or toggle OFF in development mode to set the device.
Mac OS X / macOS

On the computer;
Make sure the JDK is installed. to install Java SE Development Kit 14, click on the here.
Ensure that the BlackBerry USB driver or BlackBerry Link is installed.
For system requirements for BlackBerry Link for Mac OS X, click here.
Download BlackBerry World – Recovery Tool 0.9, then Extract the blackberry-appworld-update-0.9 folder to your computer.
Open the extracted blackberry-appworld-update-0.9 folder.
Open/run appworld-update-mac
Enter the device password.
For security reasons, the device password is not displayed
Press Enter
After the installation is complete, result :: success will be shown. Disconnect the BlackBerry 10 smartphone from the computer.
In BlackBerry Smartphone 10, turn off the development mode by restarting the BlackBerry 10 smartphone or toggle OFF in development mode to set the device.
Additional information
If the device password is entered incorrectly, you need to close and reopen the application.

If the application is launched and the development mode is OFF, the development mode IP address is not set to 169.254.0.1 or if the computer is unable to detect a connected BlackBerry 10 smartphone, the following message will be displayed. Otherwise, the following message is displayed.

Error: cannot connect: connection to /169.254.0.1:443 timed out. Please check the IP address settings of the target. You may have to reboot the target.
Mac OS X / macOS specific
If the use of appworld-update-mac messages is blocked because the identity of the developer cannot be verified, complete the following steps

Select the Apple menu
Select System Preferences
Choosing Security and Privacy
General labels
Select to block “open anytime” next to appworld-update-mac since you cannot confirm the identity of the developer.
Associated with.
BlackBerry World experienced a “network error” unable to download the app suspect cloud
Update BlackBerry World for BlackBerry 10 (with: Blackberry World download installer)

*The above information is for reference only, and it is recommended to make a backup of the data in the phone.

Huawei P8 Youth Edition Mobile 4G Single Board Q1602 Corruption Causes No Charging, No USB Recognition

I. Description of the phenomenon, problem

The fault on the maintenance work order for the phone does not charge, plug USB does not respond.

Second, the key process, root cause analysis

1. As the motherboard for the market repair, dismantling the motherboard before doing any maintenance actions, first consider whether the motherboard is burned out or customer plug and play Damaged USB interface phenomenon, that is, the first visual inspection of J1602 (USB interface) and the surrounding components appearance, found no abnormalities.

Considering that the phone does not have any response when plugged into the USB, the motherboard fault for not charging, do not identify the USB, it is likely that USB The interface has open pins or path open phenomenon. But the measurement of the USB interface of the various pins to ground impedance, and normal board comparison are normal.

3. Since the ground impedance is normal, the motherboard is no problem with the channel, but does not mean that the motherboard voltage and power supply are normal, so view the circuit diagram , through the circuit diagram USB interface pin by pin towards the measurement of each pin path voltage.

Huawei P8 Youth Edition Mobile 4G does not charge, does not identify USB repair Figure 1

4. The measurement process and corresponding measurement points are shown in the following table.

Huawei P8 Youth Edition Mobile 4G does not charge, does not recognize USB repair Figure 2

Visible measured voltage values are also normal, but considering the VBUS_USB to charge management chip (U201) between the Also through a field effect tube Q1602, this field effect tube is to control the VBUS_USB voltage to protect U201 So we measured the voltage of VCHG (C1622) and found that the voltage is 4.23V, which can be seen after Q1602. The voltage is reduced by 0.7V. Consider the voltage reduction of the control due to Q1602 body damage.

Conclusion, solution and effect

After replacing Q1602, the phone charges normally and identifies USB normally.

IV. Summary of experience, preventive measures and standard recommendations

The two faults of not charging and not recognizing the USB are often both present at the same time, and when fixing such faults be sure to link them together for a comprehensive repair. Location. The key point of such failure is about the USB pin measurement, step by step in accordance with the pin measurement anomaly, against the wiring diagram for Find out why.

iPhone 7 phone water plug no 4G signal failure

Faulty model】:iPhone 7

Fault phenomenon: No 4G letter on water inserted card

The phone is in the water, the plug-in card has a 2G signal, no 4G signal.

[Failure Analysis].
The phone can be on 2G signal, not on 4G signal, indicating that the 4G signal part of the problem, the phone is water before this fault, then water parts in the 4G signal channel caused by.

[Repair process].

Mobile phone disassembled, take off the motherboard, microscope observation, observation is not out, remove the 4G amplifier chip.

Remove the TDDPA_RF 4G amplifier chip, measure the ground resistance of the pad, found that the 11 pin MLB_PA_VBATT to ground infinity, it seems to break the line.

View the circuit diagram, found that this voltage to TDDPA_RF, MLBPA_RF 2 chip, MLBPA_RF this chip is not installed.

This voltage is PP_PA_VBATT through R7113_RF resistor renamed MLB_PA_VBATT, microscope observation, found that R7113_RF resistor has been corroded.

Check the circuit diagram labeled as 0 ohm resistor, directly shorted it.

Put the chip back on, install the machine test.

[repair results].
Test 4G signal back to normal, water caused by 4G amplifier power supply is insufficient, caused by no 4G signal, to the end of this repair.

iPhone 6p phone external no sound, headphones normal

Faulty model] iPhone 6p 64g

[Fault phenomenon]

Customer description said the phone external sound, insert headset normal, vibration and answer the phone are normal.

[Failure Analysis]

The boot test is indeed the same fault as described by the customer, because plugging in the headset normally represents the working condition of the phone big audio is already met. It could be a problem with the big audio chip and the audio amplifier or the I2S2 (the audio cable for the external amplifier). It could also be caused by the external pairing.

[Repair Process]

First troubleshoot the external match problem, the phone motherboard removed into our test machine rear shell assembly inside, boot test again found that the original fault. Now you can basically rule out the reasons for external distribution, the target directly aimed at the large audio IC disassembly chip, observe the pad with or without tin and drop point. All normal directly to the material board to remove a large audio IC tin mounted. And then this boot test found that the fault is still the same, now basically rule out the cause of the big audio IC. Disassemble the audio amplifier, measure the corresponding points, found 45_AP_TO_CODEC_XSP_I2S2_, and then remove the audio amplifier. BCLK (I2S2’s clock signal) is disconnected.

This point is only connected to the big audio, audio amplifier and CPU, dismantle the big audio to measure the corresponding point found resistance value is normal, directly from the big audio below to pull a first fly line to the audio amplifier to the corresponding point.

Directly mount the audio amplifier, power on the test.

Repair results]

Power on test, normal external playback, fault repair completed.