Table 4-1 Upgrade failures and solutions
Failure Solution
(Computer) Failed to detect the phone's presence
Check whether there is any other driver conflicting with the USB upgrade driver.
Check whether the USB upgrade driver has been installed properly.
Check whether the USB cable has been properly connected.
Check whether the serial port settings are correct.
Failed to upgrade the phone using the USB cable.
Check whether the USB cable has been properly connected.
Check whether the target firmware version is higher than the original one.
Perform the upgrade again.
Fail to upgrade the phone using the microSD card.
Check whether the upgrade file is correct.
Check whether the upgrade method is correct.
Check whether the microSD card functions properly.
Perform the upgrade again.
5 Maintenance Tools
Name: soldering iron Usage: solders components
Name: DC power supply Usage: supplies power
Name: soldering fixture Usage: secures PCBAs
Name: lead-free tin solder wire Usage: solders components
Name: digital multimeter
Usage: measures parameters during maintenance
Name: toolkit
Usage: assembles and disassembles terminals
Name: electric screwdriver
Usage: fastens and removes screws
6 Disassembly Procedure
4. Place the mobile phone on a flat panel, press the phone with your left hand, hold the electric screwdriver with your right hand, and remove all the 15 screws one after another.
3. Check the quantity and positions of screws on the rear cover. There are 15 Phillips screws.
2. Hold the phone with your right hand, lever up the hand hole on the battery cover with your left thumb to open the battery cover.
1. Ensure that the ESD wrist strap is properly grounded.
8. Check the positions of the two screws that are used to connect the battery and the front cover, place the phone on a flat panel, press the phone with your left hand, hold the electric screwdriver with your right hand, and remove the two screws.
7. After the rear cover assembly is removed.
6. Use your hands to hold both sides of the rear cover and remove the rear cover.
5. Check the position of the headset jack. Insert a finger or a spudger from the upper right corner into the headset jack, and slide your finger or the spudger clockwise to release all clips from the rear cover.
14. Hold the phone with your left hand, push leftwards the PCBA with your right hand to release clip 1 at the bottom.
13. Remove the rear camera. Use a finger or plastic tweezers to lever up the rear camera and finally to separate the camera from the front cover.
12. Remove the TP FPC ZIF. First, turn on the ZIF connector switch, use a plastic tweezers to clasp the FPC two ears, pull the FPC upwards, and remove the FPC.
11. Lever up the LCD BTB connector with a crowbar.
18. Use a finger or a crowbar to remove the front camera. Firstly, unfasten the front camera BTB and then remove the camera.
17. Use a finger or a crowbar to remove the rear camera. Firstly, unfasten the rear camera BTB and then remove the camera.
16. Shake the PCBA to release clip 3 on the right side and finally to separate the PCBA and the front cover.
15. Hold the phone with your left hand, push rightwards the PCBA neck position with your right hand to release clip 2 on the left side.
19. End.
7 Assembly Procedure
2. Connect the rear camera BTB male and female. Make 1. Ensure that the ESD wrist strap is properly
grounded.
4. Gently move the PCBA, aligning the positioning hole at the PCBA bottom with the positioning rod in the lower left corner of the front cover. Press the positioning hole area in the lower left corner of the PCBA with your left thumb to fit the positioning rod in the positioning hole. Press the board at the clip position to fit the board into the clip with your right thumb.
3. Connect the front camera BTB male and female.
Make sure the connectors are properly fastened and do not bump the surrounding components.
8. Use the tweezers to take the anti-dismantle label and attach it to its specified position on the rear cover. Use a cotton swab to gently press the anti-dismantle label, ensuring that the label is securely attached.
7. Install the15 screws clockwise, starting from the headset jack.
6. Use an electric screwdriver to install screws for fastening the front cover and the battery.
5. Fasten the LCD BTB and TP BTB to the PCBA, without touching other components. Install the battery and engage it into the BTB connector.
9. Assemble the battery cover.
8 Troubleshooting Common Faults
Before you repair a G630-U10, back up the user data and restore the phone to its factory settings.
8.1 Startup Failure
Most power-on failures are caused by power supply exceptions. Therefore, you can rectify power-on failures by troubleshooting power supply circuit faults. Power-on failures are divided into the following types:
No current: After you connect the phone to the DC power supply and power on the phone, the reading on the power supply ranges from 0 mA to 5 mA.
Weak current: After you connect the phone to the DC power supply and power on the phone, the reading on the power supply ranges from 5 mA to 100 mA.
Excessive current: After you connect the phone to the DC power supply and power on the phone, the reading on the power supply exceeds 300 mA.
If the G630-U10 fails to be powered on, observe the power-on current reading on the DC power supply to identify the fault.
No current
Figure 8-1 Troubleshooting startup failures with no current
This situation occurs when the main power circuit is short-circuited. Check whether VBUS and VPH_PWR circuits are short-circuited.
Weak current
Connect the phone to a fake battery and maintenance power supply,
press the power key, and observe the current
Is the key copper foil oxidized?
No current
Clean the key
Is the VPH_PWR voltage between the range from 3.4 V to 4.2 V, and equal to the maintenance power
voltage?
Check the clock X201
Figure 8-2 Troubleshooting startup failures with weak current
Connect the phoneto a fake battery and maintenance power supply,
press the power key, and observe the current
Check whetherU201 haspartial DC-DC voltage output
Weak current
Check the U201
Check whether other U201 outputs are short-circuited
Check whether U201 has partial L6/L17 voltage output
Check whether EMMC (U1500) is properly
soldered
Replace the U701 Y
Y
Replace the U1500 N
Excessive current is usually caused by short-circuited power supply circuits (DC power supply) which may result in 500 mA or greater current leakage. Mostly this fault occurs when VBAT is short-circuited to ground.
Figure 8-3 Troubleshooting startup failures with excessive current
Startup failure summary:
1. Current leakage in case of excessive current:
When the phone is connected to a regulated power supply, excessive power such as hundreds of mA current is generated upon a power-on. This problem usually occurs because the VBAT is generally short-circuited to the ground. It also may be because the VPH_PWR is
short-circuited to the ground. It is earlier to troubleshoot VBAT short-circuit to the ground,
Connect the phone to a fake battery and maintenance power supply,
press the power key, and observe the current
Check whether pin 1 of J1601 is
short-circuited to the ground Excessive current
(>500 mA)
Replace the J1601
Check whether the U201 voltage is normal
Repair the capacitor
Resolder or replace the U201 N
Y
N
Startup failure
Check whether the capacitor connected
to the Vbat is short-circuited
N
Y
since fewer components (PA, antenna switch, and capacitor) are connected to the VBAT. You can locate the fault by removing the components separately.
If the voltage on the VPH_PWR circuit is short-circuited, the component removal method is not applicable. Instead, adjust the DC power output voltage to about 3 V, connect the negative end of the power supply to the PCB negative end, connect the positive end of the power supply to the detected short-circuit point, touch the PCB with your hand to locate the hot position after about 20s, and then remove the hot component.
2. Current leakage in case of weak current:
If the power-on current is weak (generally less than 30 mA), usually the power management chip, PA, or an ESD protection tube is damaged. It may also be because the EMMC fails to start up and the program fails to run.
3. No or weak current when you press the power key:
If no current is generated, first check whether the power key fails to work. Then, check the power supply line to the VBAT. If weak current is gated, measure each output voltage of the power supply IC. If all IC output voltage is 0, this fault is most possibly related to the PM.
4. After you press the power key, the current sharply changes within a range or remains unchanged at a fixed value:
This problem is usually due to a CPU or PM communication fault.
8.2 Charging Failure
Figure 8-4 Troubleshooting charging failures
Y Chargingfailure
Is J1602poorly
soldered? Resolder the
J1602
Check the U201 N
Y
Y
Is the battery damaged? Change the
battery N
Are the battery connector and the battery are in good
contact
Repair the J1601 N
Is the charger functional?
Replace the charger N
Y
8.3 Camera Failure
Figure 8-5 Troubleshooting camera failures
Y Camera f ailure
Is the problem solved af ter you Is the problem
solved af ter you re-load the phone
sof tware?