Sunday, June 19, 2016

Samsung Gravity TXT – Disassembling procedure – Mobiles and Smartphones repair and Service

Samsung Gravity TXT 

Pry the back cover off with a plastic opening tool, or your fingernail, in the indentation on the bottom of the device.
Lift the back cover away from the main body of the phone.
Insert your finger in the groove below the battery.
Press the battery toward the audio jack while lifting upward and away from the phone.
Remember to place the battery back with the copper contacts on the battery lined up with those on the phone.
Using your finger, push the SIM Card down and slide out of the slot.
Slide the SIM card out enough to grab it firmly.
Remove the SIM card away from the phone.
Follow the visual on the bottom of the SIM card slot to put the SIM card back in the correct orientation.

When sliding the SIM Card back in the slot, make sure the card goes all the way in the slot until it hits the stopper.
Using your fingernail, push the microSD card slightly deeper into the slot, until you hear a click.
The removal of the battery is not required for this operation; therefore, step 3 can be skipped if just replacing the microSD card.
After the click, release the microSD card to allow it to pop out.
Remove the microSD card from its slot
When placing the microSD card back in the phone, make sure the card clicks in place.
Remove the six 3 mm #00 Phillips screws in the plastic back frame.
Slide the keyboard out.
Use a Jimmy to separate a small segment of the plastic back frame from rest of the phone.
Starting at the bottom of the keyboard is recommended.
Slide an opening pick around the rest of the seam, starting at the gap just created with the Jimmy.

You will have to slide the keyboard back in to separate the back frame from the top have of the keyboard slider.
Lift the plastic back frame away.
Unhook the volume rocker tether with a pair of tweezers or the pointed end of a spudger.
The button and tether will be in the plastic back frame.
Push the + end of the volume rocker toward the inside of the back frame until it rolls over the "+ end" retainer feature on the frame.
You may have to use the back end of a plastic opening tool or solid object to press the + side far enough to release it.
New line.Lift the button out of its slot in the frame.

Samsung Galaxy S6 - How to replace the display of Galaxy S6 - Mobiles and smartphones Repair and Servcie

Samsung Galaxy S6

DISASSEMBLING PROCEDURE 
Insert a paper clip or SIM eject tool into the hole in the SIM card slot on the power button side of the phone.
Press to eject the SIM card tray.
Don't press too hard or you may damage the SIM card tray.
Remove the SIM card tray from the phone.
Slightly warm-up the front panel with blower
Attach a heavy-duty suction cup to the lower half of the rear glass panel.
Secure the suction cup by raising the hinged handle and flipping the latch to clamp both handles in place.
The following steps involve using an opening pick to separate the rear panel from the midframe. If the adhesive is too strong, reapply heat with the iOpener.
Using the suction cup, apply pressure to the middle section of the panel while pulling up the lower edge by pivoting your wrist.
Once you've opened a large enough gap, insert an opening pick between the rear glass and the midframe.
Slide the opening pick around the bottom left corner of the rear glass panel.
Slide the pick down the power button side of the phone.
Slide the opening pick along the top of the phone.
Slide the opening pick down along the volume buttons side of the phone.
Pull up on the rear glass panel while holding down the midframe to separate the components.
If you encounter too much resistance from the adhesive, slide the opening pick under the glass a few more times.
Insert an opening pick between the rear panel and the midframe.
Slide the pick along the top of the phone to loosen the remaining adhesive. Twist the pick to separate the two pieces.
At this point, the rear glass panel should be fully separated from the body of the phone, although the adhesive strip may be attached to both sides.
Pull the rear panel up and away to completely separate it.
Remove the thirteen 3.5mm Phillips #00 screws securing the midframe to the phone.
Firmly grasp the edge of the midframe assembly.
Lift up on the midframe assembly while pushing down on the battery to separate the midframe assembly from the rest of the phone.
Lift the midframe assembly up to separate it from the rest of the phone.
Use the flat end of the spudger to disconnect the battery connector from its socket on the motherboard.
Insert a plastic opening pick between the case and the battery.
Be careful to keep the pick as flat as possible to avoid bending the battery, which may damage it and cause it to release dangerous chemicals.
Push the pick further in to separate the battery from the phone. If the battery is too strongly adhered for the opening pick, place a warm iOpener over the battery to loosen the adhesive.

Do not pry against the motherboard or you may damage the phone.
Remove the battery from the phone.
Use the pointed edge of a spudger to disconnect the Bluetooth and Wi-Fi antenna cable connectors from their sockets on the motherboard.
Use the flat end of the spudger to disconnect the home button connector.
Use the flat end of a spudger to disconnect the display assembly cable from the motherboard.
Disconnect the earpiece speaker assembly cable connector from the motherboard.
Lift the camera-side end of the motherboard to separate it from the display frame. Do not fully remove the motherboard yet it is still attached to the daughterboard via a ribbon cable on the underside of the motherboard.

Disconnect the daughterboard ribbon cable connector from its socket on the underside of the motherboard.
Display Assembly
Slightly warm up the display panel with a hot air gun.
Insert the opening pick at an upward angle.
When done correctly, you will see a gap between the display frame and the displayassembly.

When done incorrectly, the pick will be visible through the LCD. If this happens simplyremove the pick and start again.
Flip the phone over so it's facedown.
Insert an opening pick on the right side of the phone between the display assembly andplastic display frame
Slide the pick downwards to separate the display frame from the display assembly.
Leave the first opening pick next to the headphone jack.
Insert a second opening pick between the frame and display assembly on the display cableside of the phone.
Slide the second pick towards the daughterboard.
Insert another pick between the display frame and digitizer from the top side of the phone.
Slide the pick along the top of the phone towards the vibrator.
Pull the pick out slightly to avoid the earpiece speaker grille.
Slide the opening pick around the top right corner of the phone.
Use just the tip of the pick for this step, as the touchscreen controller IC is below thedisplay frame in the top right corner.
Grasp the opening pick next to the headphone jack and slide it to the bottom right corner ofthe display frame.
Twist the opening pick to separate the plastic frame from the display assembly.
Continue to lift the plastic frame from the right side, using the display connector as ahinge.
Once you've lifted the frame past 90 degrees, thread the digitizer cable through its hole inthe display frame and separate the frame from the display assembly

Lenovo Thinkpad L510 – SL410 – How to test the battery pack – How to check the backup battery – How to check the Adapter voltage

Lenovo Thinkpad L510 – SL410

Checking the ac power adapter
You are here because the computer fails only when the ac adapter is used.
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 adapter for correct continuity and installation.
To check the ac adapter, do the following:
1. Unplug the ac adapter cable from the computer.
2. Measure the output voltage at the plug of the ac adapter cable. See the following figure:
Note: Output voltage of pin 2 of the ac adapter may differ from the one you are servicing.
3. If the voltage is not correct, replace the ac adapter.
4. If the voltage is acceptable, do the following:
Replace the system board.
Note: Noise from the ac adapter does not always indicate a defect.
Checking operational charging
To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer. Perform operational charging. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still does not turn on, replace the battery pack. If the charge indicator still does not turn on, replace the system board. Then reinstall the battery pack. If it is still not charged, go to the next section.
Checking the battery pack
Battery charging does not start until the Power Manager Battery Gauge shows that less than 96% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life. To check your battery, move your cursor to the Power Manager Battery Gauge icon in the icon tray of the Windows taskbar and wait for a moment (but do not click), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Manager Battery Gauge icon.
To check the battery pack, do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the following figure
3. If the voltage is less than +11.0 V dc, the battery pack has been discharged.
Note: Recharging will take at least 3 hours, even if the indicator does not turn on.
If the voltage is still less than +11.0 V dc after recharging, replace the battery.
4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7.
The resistance must be 4 to 30 K Ω. If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.
Checking the backup battery
Do the following:
1. Power off the computer, and unplug the ac 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 figure.
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.

HP LaserJet printer – Clearing Jams – Troubleshooting – Function check – High voltage contact check – Drum rotation check - HP LaserJet 1010 -1012 -1015 -1020 – Printers and copiers repair and service

HP LaserJet 1010 -1012 -1015 -1020

Clearing jams
To prevent damage to the printer when clearing jams, including jams in the output bin, always open the print-cartridge door and remove the print cartridge. Keep the door open and the cartridge out until the jam has been cleared. Opening the print-cartridge door and removing the print cartridge relieves tension on the printer rollers, which prevents damage to the printer and makes the removal of jammed pages easier.
Typical media jam locations
Print cartridge area:
Input tray area: If the page is still sticking out of the input tray, gently try to remove it from the input tray without tearing the page. If you feel resistance, see  Output path: If the page is sticking out of the output bin.
Removing a jammed paper
Media jams might result in loose toner on the page. If you get any toner on your clothes, wash them in cold water. Hot water will permanently set the toner into the fabric.
To prevent damage to the printer when clearing jams, including jams in the output bin, always open the print cartridge door and remove the print cartridge.
To prevent damage to the print cartridge, minimize its exposure to direct light. Cover the print cartridge with a sheet of paper.
1. Open the print cartridge door, and remove the print cartridge.
2. Grasp the middle edge of the side of the media that is most visible, and carefully pull it free from the printer
Do not use sharp objects, such as tweezers or needle nose pliers, to remove jams. Damage caused by sharp objects will not be covered by the warranty.
Always pull jammed media in the direction it would travel through the paper path.
Do not forcefully pull jammed media against the direction of travel through the paper path to avoid damage to the printer.
3. When you have removed the jammed media, replace the print cartridge, and close the print cartridge door.
After clearing a media jam, you might need to turn the printer off then on again.
When you add new media, remove all of the media from the input tray and straighten the stack of new media.
Troubleshooting
No power is available because the power source, cable, or switch failed.
1. Verify that the product is plugged in. Make sure that the printer is plugged directly into a working wall receptacle.
2. Verify that the power cable is functional and that the power switch is on.
3. If these conditions are correct, replace the engine power assembly.
The printer motor does not rotate.
1. Make sure that the printer is plugged directly into a working wall receptacle.
2. Verify that the print-cartridge door is closed.
3. Verify that the print path is clear. If it is, verify that the printpath paper-sensor arms are clean and functional.
4. Verify that the cable from the ECU to the motor is connected.
5. If these conditions are correct, replace the ECU.
6. If, after replacing the ECU, the printer motor still does not rotate, replace the engine-power assembly.
7. If, after replacing the ECU and engine-power assembly, the printer motor still does not rotate, replace the printer.
The media does not move smoothly through the paper path
If the media is consistently jamming and the paper path is clear, replace either the paper-pickup assembly or the fuser, depending on where it is jamming.
Functional checks
This section includes five functional checks for troubleshooting.
Half self-test functional check
The print process can be subdivided into the following stages:
Image-formation stage (charges the drum and writes a latent image to the drum with the laser)
Development stage (forms a toner image on the drum)
Transfer stage (transfers the image to media)
Cleaning stage (removes excess toner from the drum)
Fusing stage (applies heat and pressure to make the image permanent on the media)
To perform a half self-test check
The purpose of the half self-test check is to begin the printing process and then interrupt it in the middle. Examining the printer components at that point allows you to determine which stage in the print process is malfunctioning.
1. HP LaserJet 1010 series: Press the GO button to print a demo (self-test) page.
HP LaserJet 1020 printer: Open the Printer Properties dialog box. Select Print Test Page to print a test page. Click OK to close the HP LaserJet 1020 test page troubleshooting dialog box. Click OK again to close the Printer Properties dialog box.
2. Open the print-cartridge door the instant the leading edge of the paper exits the printer.
3. Remove the print cartridge.
4. Open the print cartridge drum shield to view the drum surface. If a dark and distinct toner image is present on the drum surface, then the first two functions of the electrophotographic process are functioning (image-formation and development). Any failure is occurring in the transfer or fusing stag.
To perform other checks
If no image appears on the photosensitive drum, perform these checks:
1. Make sure that you remove the entire length of the sealing tape from the print cartridge before you install the cartridge. If the tape is not removed, then toner cannot reach the drum.
2. Perform a drum-rotation functional check to ensure that the drum is rotating
3. Perform a high-voltage contact check.
4 Check the fuser connections (callout 1) on the engine-power assembly. Also check the high voltage connection at the back side of the printer.
The following figure shows the HP LaserJet 1010 series products. The connections are located at the same place on the HP LaserJet 1020 printer.
If a transfer problem exists, replace the transfer roller (do not touch the black-sponge portion of the transfer roller). If a fuser problem exists, first check to make sure that the four cables to the fuser are correctly seated in the engine-power assembly.
Drum-rotation functional check
The photosensitive drum, which is located in the print cartridge, must rotate in order for the print process to work. The photosensitive drum receives its drive from the main motor through a system of gears on
the right side of the printer.
1. Open the print-cartridge door.
2. Remove the print cartridge.
3. Mark the drive gear on the cartridge with a felt-tipped marker. Note the position of the mark.
4. Install the print cartridge and close the print-cartridge door. The startup sequence should rotate the drum enough to move the mark.
5. Open the print-cartridge door and inspect the gear that was marked in step 3. Verify that the mark moved.
If the mark did not move, inspect the drive shaft that moves into the print-cartridge area when the printcartridge door is closed to make sure that it is meshing with the print cartridge. If the drive shaft looks functional and the drum does not move, replace the print cartridge. If the drive shaft is damaged, replace the printer.
High-voltage-contacts check
The high-voltage contacts in the printer must have a good connection with the contacts on the print cartridge to provide the necessary voltages for the electrophotographic processes. To check the print-cartridge contacts.
Remove the print cartridge and visually inspect the three connection points (callout 1) on the end of the print cartridge. If they are dirty or corroded, clean the connection. If they are damaged, replace the print cartridge.
Use a dry cloth to clean the connections
To check the printer high-voltage contacts. 
The printer has three spring-loaded pins (callout 1) that make contact with the high-voltage points on the print cartridge. Verify that the pins are not dirty or corroded and that the spring-loading action is functional. If the pins are dirty or obstructed, clean them. If they are damaged, replace the printer.
Solenoid, sensors, switches, and motor location
The following figure shows the locations of the solenoid, sensors, and switches.
1. The door switch detects whether or not the print-cartridge door is closed. Printing cannot continue until the print-cartridge door is closed.
2. Power switch
3. The paper-width sensor senses the width of the media.
4. The paper-delivery sensor senses when media has successfully moved out of the fusing area.
5. The top-of-page sensor detects the leading and trailing edges of the media. It synchronizes the photosensitive drum and the top of the media.
6. Solenoid
7. Motor