SAMSUNG GALAXY GT-P7320 - GSM TELEPHONE TROUBLESHOOTING – POWER PROBLEM – TOUCH PROBLEM – SPEAKER PROBLEM – CHARGING TROUBLE

How to troubleshoot - Samsung galaxy tablet - GSM TELEPHONE GT-P7320 – power problem – touch problem – speaker problem – Charging trouble

Samsung galaxy GT-P7320: TROUBLESHOOTING 

Power On does not work

C1009 = 3.5V > 4.2V ?

Check CON1000 component and replace.

When Power key press, is R1500 is 0V ?
Check Power Key FPCB Part & C1519

MSM_PS_HOLD(R728) = 1.8V

After Check UCP400 circuit, Replace UCP400

Check U702 Power stage C794,C795 = 1.1V C787 = 1.8V, C776 = 1.8V,

After Check U702 circuit, Replace U702

Check U700 Power stage C740, C741 = 1.2V, C726 = 2.85V

After check U700 circuit, Replace U700

Check U1107 Power stage C1120 = 5V L1102 = 14~18V

After check U1107 circuit, Replace U1107

CP Power on does not work

Check the Setting-About device Baseband version

After SW D/L, recheck the Baseband version & if the reproducing, PBA is change.

Check U802 power stage C837 = 1.1V, C838 = 1.3V, C839 = 1.8V, C831 = 1.8V C832 = 2.85V

Check the U701 circuit & Replace U701

MDM _PS_HOLD = 1.8V

Check the R815,U806 circuit & replace U806

Check U600 power stage C607 = 1.1V

Check the U600 circuit & replace U600

Check the UCP600 state

Initial Failure

MDM_PON_RESET_N(C862), TP_MDM_PM_INT_N >= 1.8V(HIGH)

Check UCP400 (short, crack, etc.)

MDM2AP_WAKEUP(TP_M400), >= 1.8V(HIGH)

Check UCP600 (short, crack, etc.)

There is 32.768KHz wave forms at OSC701(C748) and OSC800(C835)

Replace OSC701 and OSC800

There is 32.768KHz wave forms at OSC701(C748) and OSC800(C835)

Replace OSC701 and OSC800

There are 19.2MHz wave forms at OSC700(C745) and 19.2MHz wave forms at OSC1100(C1104)

Replace OSC700 and OSC1100

LCD display OK?

Check the LCD part(short, crack, etc.)

Sound is OK?

Check the Audio Part(short, crack, etc.)

Insert SIM card

Check connection of HDC1001

re-connect and check again or change SIMsocket FPCB

Check the SIM Voltage. (R1033) >= 2.8

Change to the new SIM card. If it doesn`t still work SIM card after changing the SIM card, Check the UCP600 (Crack etc)

Abnormal charging

Check C1019 whether voltage is greater than 5V.

Check the TA and the DLC. (TA or DLC may not be connected properly)

Check C1101 whether the voltage reading is greater than 5V. C1011

Check U1003 chip

Check C851 whether voltage reading is greater than 4.2V

Check U803 chip (U803 chip may not work at room temperature)

Check C851 whether voltage reading is greater than 4.2V

Check U803 chip (U805 chip may not work) U805

Check C842 whether voltage is change when TA is connected

Check U803 chip (U803 chip may not work)

Microphone Part

Check main microphone function in cam recording mode

Check the status of MIC module

Replace MIC module

Check the HDC900 is connected

Connect the HDC900

L902 = 1.5V, L903 = 0.3V ? and check the soldering status

Check the U906 LDO and MIC. If there is crack, replace them

Speaker

Check speaker function. Play MP3 with maximum volume level.

Check the speaker module is soldered well.

Resolder speaker module

Check the L906,907,908,909 Signal when music is playing.

Check the U403 and near parts If there is crack, replace them

Check the C951, C954 Audio signal when music is playing

Check the U202 and near parts If there is crack, replace them

LCD

LCD is still off after PWR ON

Check the connection of HDC1100

Reconnect the HDC1100

Check the C1121 and High(about 18V)

Check the Backlight Driver IC(U1107)

Check C1110=1.8V, C1106=1.2V,C1108=3.3V

Check the PMIC(U702) DC-DC(U1100) BUCK(U1105)

Check the signal IDISPLAY_PCLK(TP1107) LCD_F(0)(TP1100)

Check the freq of C1105(19.2MHz)

Replace or resolder OSC1100

Replace LCD Module

Check the U1103

Touch Screen does not work

Check TSP Connector on Main PBA

Reconnect the SLC1200

Pin1 = 2.8 U1202 V(C1201)

Resolder or Replace U1202

U1200,1201 Pin J6 > 2.5V (C1204, C1208)

Resolder or Replace U1200,1201

U1200,1201 Pin J6 > 2.5V (C1204, C1208)

Resolder or Replace U1200,1201

Check the I2C signal of Sensor IC(R1200, R1201)

Resolder R1200, R1201

Replace TSP Module.

Tablet with support for GSM voice communication, SMS, and MMS
For Telstra in Australia

Network	Technology	GSM / HSPA / LTE

Launch	Announced	2012, Q1. Released 2012, Q1
	Status	Discontinued

Body	Dimensions	230.9 x 157.8 x 8.6 mm (9.09 x 6.21 x 0.34 in)
	Weight	458 g (1.01 lb)
	SIM	Mini-SIM

Display	Type	PLS TFT capacitive touchscreen, 16M colors
	Size	8.9 inches, 229.7 cm2 (~63.0% screen-to-body ratio)
	Resolution	800 x 1280 pixels, 16:10 ratio (~170 ppi density)
		TouchWiz UX UI

Platform	OS	Android 3.2 (Honeycomb)
	Chipset	Nvidia Tegra 2 T20
	CPU	Dual-core 1.5 GHz Cortex-A9
	GPU	ULP GeForce

Memory	Card slot	No
	Internal	16GB 1GB RAM, 32GB 1GB RAM

Main Camera	Single	3.15 MP, AF
	Video	720p

Selfie camera	Single	2 MP
	Video

Sound	Loudspeaker	Yes, with stereo speakers
	3.5mm jack	Yes

Comms	WLAN	Wi-Fi 802.11 a/b/g/n, dual-band, hotspot
	Bluetooth	3.0, A2DP
	GPS	Yes, with A-GPS
	Radio	No
	USB	2.0

Features	Sensors	Accelerometer, gyro, compass
		TV-out MP4/DivX/Xvid/H.264 player MP3/WAV/eAAC+/OGG player Photo/video editor Quickoffice HD editor/viewer

Battery		Non-removable Li-Po 6100 mAh battery
	Stand-by	Up to 500 h
	Talk time	Up to 7 h

Misc	Colors	Black
	SAR	1.75 W/kg (body)

ENVIZEN V100M – DISASSEMBLING PROCEDURE - HOW TO REPLACE THE LCD SCREEN

Envizen V100M – Disassembling procedure - How to replace the LCD Screen

Remove the two screws on the side of the tablet that hold the back cover in place using the screwdriver.
The screws for the back cover are: 1.5mm diameter x 3.5mm long
When doing any work on electronic devices, always use an anti-static wrist strap!
With the prying tool separate the back cover from the rest of the device.
The speakers are attached to the back cover and motherboard assembly so remove carefully.
Remove the non-conductive tape that is on the battery and motherboard assembly.
Slide the spudger under the battery.
Pry the battery up, and work your way down the side of the battery, releasing it from the adhesive holding it down.
Be careful not to deform or puncture the battery when prying it out, as it could cause a fire.
Carefully pull the battery out of the Envizen V100M.
Remove the solder from the wires connecting the battery to the motherboard
Remove the soldered wires with the tweezers. If this does not work you are going to have to heat up the solder in order to remove the wires
Remove the power to the LCD screen. This is a matter of removing the grey wire and white wires that are soldered to the motherboard.
Note the orientation of the grey wire and white wire. The location of each wire is VERY important.
Remove the five screws holding the motherboard assembly down using the screwdriver
These screws are also 1.5mm in diameter and 3.5mm long
Remove the three ribbon cables from their couplings.
Using the prying tool gently push the bracket up, allowing for the cable to right out.
Remove the solder holding the white ribbon cable in place.
Then flip the motherboard over to access the screws for the rear facing camera.
Be very careful that you doe not tear the wires for the camera. gently flip the motherboard making sure to not stress out the wires.
Unscrew the camera from the back of the motherboard using the screwdriver.
Gently push on the black plastic bracket holding the camera in place. The bracket should pop right out.
The screws for mounting bracket are also 1.5mm diameter and 3.5mm long.
Now the motherboard is completely removed from the tablet.
Place the motherboard in a static-free location
Remove the three ribbon cables from their couplings
Using the prying tool gently push the bracket up, allowing for the cable to right out.
Remove the solder holding the white ribbon cable in place.
Then flip the motherboard over to access the screws for the rear facing camera.
Be very careful that you doe not tear the wires for the camera. gently flip the motherboard making sure to not stress out the wires.
Unscrew the camera from the back of the motherboard using the screwdriver.
Gently push on the black plastic bracket holding the camera in place. The bracket should pop right out.
The camera is then free from the motherboard assembly and can be replaced.
The screws for mounting bracket are also 1.5mm diameter and 3.5mm long.
Remove the six brackets around the outside of the LCD screen using the screwdriver
The 12 screws holding down the mounting brackets are 1.5mm in diameter and 2.8mm long
The LCD can now be removed from the plastic tablet housing.

KURIO XTREME – DISASSEMBLING PROCEDURE – HOW TO REMOVE THE CASE – HOW TO REMOVE THE BATTERY – HOW TO REMOVE THE MOTHER BOARD

Kurio Xtreme – Disassembling procedure – How to remove the case – How to remove the battery – How to remove the mother board

Kurio Xtreme Tablet: DISASSEMBLING PROCEDURE 
Remove the rubber case by beginning to peel from one of the top corners and continue peeling until the cover is completely removed.
Unscrew the four 4 mm black screws using a Phillips #000 screw driver.
There are two screws on each side of the device (four total).
Insert the plastic opening tool in between the edges of the blue front casing and black back casing.
Slide the plastic opening tool around the perimeter of the device. This may require that you repeatedly run the opening tool up and down the edges of the device.
Be sure not to break any of the plastic clamps along the edges of the device when removing the back cover.
Carefully lift the back panel off of the rest of the device.
Unscrew the three 4 mm screws with a Phillips #000 screwdriver.
Remove the orange data display ribbon wire above the battery by prying open the ZIF
connector with the plastic opening tool.
Remove the orange data display ribbon wire to the left of the battery by prying open the
ZIF connector with the plastic opening tool.
Remove the 7 wires connected to the motherboard by soldering the ends that connect them to the motherboard.
2 pairs of red and black speaker wires (4 wires total)
1 pair of red and black battery wires (2 wires total)
1 gray ground wire
The soldering iron gets very hot and may injure you if exposed to your skin.
Remove the motherboard by lifting it out of the casing.

HKC TABLETS – HKC 7 – DISASSEMBLING PROCEDURE

HKC Tablets – HKC 7 – Disassembling procedure

HKC Tablets – HKC 7 – Disassembling procedure – How to remove the case – How to remove the battery – How to remove the touch screen – How to remove the mother board

HKC P776A 

DISASSEMBLING PROCEDURE 

Insert the plastic opening tool between the digitizer and the case. Place the spudger in the gap created by the plastic opening tool to assist in separation.

Slide the spudger along the perimeter of the device to fully separate the two pieces.

Use your fingers to pop the screen out from the digitizer.

With the plastic opening tool, lift the black latch up.

Pull the optical cord out from the motherboard.

Use your fingers to pop the screen out from the digitizer.

Use the tip of the spudger to release the latches on the motherboard.

Remove the cable from the motherboard.

Use the tip of the spudger to release the latches on the motherboard.

Remove the camera from the device.

Peel off the tape that is attaching the wifi antenna to the case.

Using the soldering iron, heat up the solder that is attaching the antenna to the motheboard. The heat from the soldering iron may cause personal injury or damage the internal components of the tablet.

Suck up the leftover solder using the desoldering pump. Remove the wifi antenna from the motherboard. Insert the plastic opening tool between the battery and case. Apply leverage to break the glue that is attaching the battery to the case.

Continue breaking the glue along the perimeter of the battery until the battery can be removed. Breaking all the glue between the battery and case may take a long time.

Using the soldering iron, heat up the solder that is attaching the battery to the motheboard. The heat from the soldering iron may cause personal injury or damage the internal components of the tablet.

Suck up the leftover solder using the desoldering pump. Remove the battery from the motherboard.

Using the screwdriver, remove the four 4mm by 1.5mm screws that are attaching the motherboard to the case.

Remove the black material that is covering the speaker.

Insert the spudger into the speaker slot on the back of the case.

Push the speaker out of the case with the spudger. Remove the motherboard from the case.

LENOVO THINKPADX 230T – HOW TO CHECK THE AC ADAPTER

Lenovo ThinkPad X230T – How to check the AC adapter

Lenovo ThinkPadX230T – How to check the AC adapter – How to check the battery pack – How to check the Backup battery

Lenovo ThinkPad X230T: Power system checkout
To verify a symptom, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac power adapter.
4. Check that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the ac power adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
“Checking the ac power adapter”
“Checking operational charging”
“Checking the battery pack”
“Checking the backup battery”
Checking the ac power adapter
If you computer fails only when the ac power adapter is used, use the instructions in this topic.
If the power problem occurs only when the docking station or the port replicator is used, replace the docking station or the port replicator

If the power-on indicator does not turn on, check the power cord of the ac power adapter for correct continuity and installation.
If the computer does not charge during operation.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable. See the following illustration

Note: Output voltage across pin 2 of the ac power adapter might differ from the one you are servicing.

3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, replace the system board.
Note: Noise from the ac power adapter does not always indicate a defect.
Checking operational charging
To check whether the battery charges properly during operation, do the following:
Note: Before you begin, install a discharged battery pack or a battery pack that has less than 50% of the total power remaining in the computer.
1. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature.
2. Reinstall the battery pack.
3. If the indicator still does not turn on, replace the battery pack.
Checking the battery pack
The battery status icon in the Windows notification area displays the percentage of battery power remaining.
To check for detailed battery status information, do the following:
For 7: Open the Power Manager program and click the Battery tab.
For 8: Open the Lenovo Support program and click Battery Health, or open the Lenovo
Settings program and click Power.
Note: If the battery pack becomes hot, it may not be able to charge. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it.
To check the battery pack, do the following:
1. Turn off the computer and disconnect the ac power adapter.
2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). The correct voltages are shown in the following table.

3. Measure the resistance between battery terminal 5 and 7(-). The resistances houldbe 4 to 30KOHM. If the resistance is not correct, replace the battery pack.

4. Depending on the voltage that you measure, do one of the following:
If the voltage is less than +11.0 V dc, recharge the battery. If the voltage is still less than +11.0 V dc after recharging, replace the battery pack.
If the voltage is more than +11.0 V dc, discharge the battery pack until the voltage becomes less than +11.0 V dc. Then recharge the battery pack. If the voltage is still less than +11.0 V dc, replace the battery pack.
Note: Recharging will take at least three hours, even if the battery status indicator does not turn on.
5. Replace the system board if the new battery pack is not charged.
Checking the backup battery
Do the following:
1. Power off the computer, and unplug the ac power adapter from it.
2. Turn the computer upside down.
3. Remove the battery pack
4. Remove the backup battery
5. Measure the voltage of the backup battery. See the following illustration.

If the voltage is correct, replace the system board.

If the voltage is not correct, replace the backup battery.
If the backup battery discharges quickly after replacement, replace the system board.

CLICKN KIDS TABLET – DISASSEMBLING PROCEDURE – HOW TO REMOVE THE CASE – HOW TO REPLACE THE TOUCH SCREEN

ClickN Kids Tablet – Disassembling procedure – How to remove the case – How to replace the touch screen

ClickN Kids Tablet 

Start on the side with the camera
Insert a plastic opening tool into the space between the screen and the back side.
The screen side is black, the back side is colored

Press the plastic opening tool in until you hear a “click” and that part of the tablet opens.

Press and slide the plastic opening tool around all sides of the tablet until all sides pop off.
The corners can be tricky. Also, You need to pry out all sides to access the inside.

Lift the detached screen from the camera side until you can see the inside of the tablet.

Don't open too fast, or you might damage the ribbon cables.

Be careful not to damage any wires or ribbon cables during this step.
There are two ribbon cables to remove during this step. Each is connected to a base on the motherboard.
There is a black tab behind the long ribbon cable. Lift up the black tab.
For the ribbon cable in the back, pull the black tabs on the side out.
Detach the ribbon cables connecting the screen to the motherboard.
Remove any tape that is holding down the ribbon cables. Set it aside.
Once the ribbon cables are freed, separate the top and bottom sides.

Remove the yellow tape on the right side. Easiest side to get. Remove the black and yellow tape stuck together on the left and bottom sides of the

screen.

Make sure the screen is facedown and level to prevent or reduce damage to the display.

There is an adhesive on the top edge of the display’s face. Be careful not to damage the display.
Flex the sides of the tablet until the clips holding the display to the screen case pop loose.

Be careful not to damage the display or screen case.

Pull the display from the top side to detach it from the screen case.

LENOVO YOGA TABLET 10 HD+ DISSEMBLING AND CHARGER TESTING

LENOVO YOGA TABLET 10 HD+ DISSEMBLING AND CHARGER TESTING

LENOVO YOGA TABLET 10 HD+

DISSEMBLING AND CHARGER TESTING 

Checking the Computer AC Charger
When you use the computer AC Charger to charge the tablet but no power is charged, see the instructions in this topic to check the computer AC Charger. To check the computer AC Charger, do the following:
1. Disconnect the micro-USB cable from the tablet.
2. Measure the output voltage across the connector marked B of the micro-USB cable. Refer to the following figure:

Note: The output voltage across pin 3 of the micro-B connector might be different from the one you are servicing.
3. If the voltage is not correct, replace the micro-USB cable.
4. If the voltage is acceptable, replace the system board.

Checking the internal battery status
To check the battery status of the tablet, do either of the following:
• Approximate information about the battery status
Get the approximate status of the battery at any time by checking the battery status icon on the system bar in the upper-right corner of the screen. The shorter the green bar is, the less the battery power remains.
• Accurate information about the battery status
To get the accurate information about the battery status of the tablet, do the following:
1. Open the Android Settings screen. To open the Android Settings screen, do either of the following:
– From the main Home screen, touch the Android Settings icon on Lenovo Launch Zone. The Android Settings screen is displayed.
– Pull down the application icon from the action bar and then touch Settings. The Android Settings screen is displayed.
2. Touch Battery in the Device section on the Android Settings screen.
3. The accurate percentage of the remaining battery power is shown on the screen.

DISASSEMBLING

 Rear cover

1. Open the hinge frame and then remove the card slot cover of the tablet using a thin flat blade or guitar pick

2. Remove screws 1  on the rear cover as shown in the figure below.

3. Separate the top right corner of the rear cover from the main body of the tablet using a suction tool as shown in the figure below.

4. Move the suction tool to the left along the upper edge to unlock the entire upper edge of the rear cover from the main body.

5. Attach the suction tool to the areas as shown in the figure below to disengage the three locks inside the rear cover.

6. Slowly remove the rear cover

Right speaker

1. Disconnect the power supply to the tablet by detaching the battery FPC from its connector on the main board using a guitar pick.

2. Unlock the FPC connector of the right speaker on the sub board using a guitar pick.

3. Pull out the FPC of the right speaker from its connector using a pair of tweezers.

4. Remove screws 1 on the holder of the right speaker as shown in the figure below.

5. Remove the holder of the right speaker

6. Lift one end of the right speaker using a thin flat blade and at the same time push the right speaker on the other end in the direction as shown in the figure below.

7. Remove the right speaker.

Battery pack

1. Disconnect the battery FPC from its connector on the main board using a guitar pick.

2. Slowly pull out the hinge pivot using a pair of tweezers until about half the pivot length moves out.

3. Detach the hinge frame at the left end, turn the hinge frame clockwise around its right end so as to steer the battery FPC out through the supporting frame at the right end, and then remove the hinge frame from the main body of the tablet.

4. Peel off the foil on the battery cover at the FPC end of the hinge frame

5. Remove screw 1 on the battery cover as shown in the figure below.

6. Remove the battery cover as shown in the figure below.

7. Remove the battery pack from the hinge frame.

8. Remove the hinge pivot by pushing it on the right side