Apple MacBook Air 13 – How to disassemble – How to remove the CPU fan – How to remove the CPU heat sink

Apple MacBook Air 13: CPU FAN AND HEAT SINK REPLACEMENT PROCEDURE 

Before proceeding, power down your machine. Close the display and lay it on a soft surface top-side down. Remove the following ten screws:
Two 9 mm P5 Pentalobe screws 

Eight 2.6 mm P5 Pentalobe screws.
Wedge your fingers between the display and the lower case and pull upward to pop the lower case off the Air. Remove the lower case and set it aside.

To ensure that everything is de-energized and won't turn on while you're working, it is recommended that you disconnect the battery. Grab the clear plastic pull tab attached to the battery connector and pull it toward the front edge of the Air to disconnect the battery from the logic board. Do not lift upward on the connector as you disconnect it.

Use the flat end of a spudger to pry the I/O board cable connector up out of its socket on the I/O board.

Carefully peel the I/O board cable from the adhesive securing it to the top of the fan.

The following connector has an especially deep socket. Use care when disconnecting it. While gently pulling the I/O board cable upward near its connection to the logic board, use the flat end of a spudger to pry up on alternating sides of the connector to help "walk" it out of its socket. Remove the I/O board cable.

Use the tip of a spudger to carefully flip up the retaining flap on the fan cable ZIF socket. Be sure you are prying up on the hinged retaining flap, not the socket itself. Peel the rubber gasket off the adhesive on the top of the fan.

Remove the following three screws securing the fan to the upper case:

One 3.6 mm T5 Torx screw
One 2.7 mm T5 Torx screw One 3.6 mm T5 Torx screw with a short head,

Lift the fan from the I/O board side and pull it free from the upper case. Removing the fan will also disconnect the fan ribbon cable. Be careful not to snag it.

Disconnect the I/O board by pulling its power cable away from its socket on the logic board. Pull the cable parallel to the face of the logic board toward the right edge of the Air.

Use the flat end of a spudger to pry the left speaker cable connector up and out of its socket on the I/O board. Pry up from beneath the wires.

Use the tip of a spudger to carefully flip up the retaining flap on the microphone ribbon cable ZIF socket. Make sure you are flipping up the retaining flap, not the socket itself.

Remove the single 3.6 mm T5 Torx screw securing the I/O board to the upper case.

Gently de-route the camera cable from its notch on the I/O board and push it out of the way with the tip of a spudger.

Lift the I/O board from the logic board side and pull it free from the upper case. Removing the I/O board will also disconnect the microphone ribbon cable. Be careful not to snag it.

Remove the two 4.9 mm T8 Torx screws securing the antenna cable retainer on the left display hinge to the upper case.

Push the antenna cable retainer out of the way and remove the single 3 mm T5 Torx screw securing the end of the heat sink to the upper case.

Remove the four 2.5 mm T5 Torx screws securing the heat sink to the logic board.

If the heat sink seems to be stuck to the logic board after removing all five screws, use a spudger to carefully separate the heat sink from the faces of the CPU and GPU.

Remove the heat sink from the logic board. When reinstalling the heat sink, be sure to apply a new layer of thermal paste.

When reassembling your device, attach the gasket to the heat sink as shown. The tail of the gasket should fit into the notch in the heat sink, it should not end up underneath the heat sink tab that will rest on the logic board. Be sure the small post molded into the rubber gasket mates with the hole cut into the upper right corner of the logic board.

How to replace the speakers of Blackberry Curve - 8320

Blackberry Curve 8320: HOW TO REPLACE THE SPEAKERS 

Hold the phone with the back facing you. Press the silver tab down and remove the cover.

Pull up on the top edge of the battery to remove it.

Use a plastic opening tool to gently pry the bottom cover loose.
Do not use excessive force at risk of damaging the antenna, which is under this casing.
Pull the cover from the front of the phone after the back is loose.

Remove the two top screws with a T5 Torx screwdriver. The screws are 8mm long.

Gently pry off the top of the side casings.
The side casings cannot be fully removed yet because they are screwed on at the bottom.

Use a plastic opening tool to detach the securing clips holding the the front panel in place. There are six securing clips total.

Remove the front panel. You may need to apply some force because the front panel is attached to the rest of the device with adhesive.

Use a T6 Torx screwdriver to remove the four screws located on the corners of the keyboard frame. The screws are 6mm long.

After the bottom two screws have been removed the side casings can be removed.

Remove the back case. The speaker is located on the back case.

How to check the lamp usage – How to extend lamp life - projector - Benq TH670

Benq projector - Benq TH670 – How to check the lamp usage – How to extend lamp life – How to replace the lamp - How to reset the lamp hour

How to check the lamp usage time

When the projector is in operation, the duration (in hours) of lamp usage is automatically calculated by the built-in timer. The method of calculating the equivalent lamp hour is as follows:
Total (equivalent) lamp hour
= 1 (hours used in Economic mode) + 4/3 (hours used in normal mode)
The lamp hour in Economic mode is calculated as 3/4 of that in Normal mode. That is, using the projector in Economic mode helps to extend the lamp hour by 1/3.
To obtain the lamp hour information:
1. Open the OSD menu and go to the Advanced menu > System Setup: Advanced > Lamp Settings menu. Press OK on the projector or remote control.
2. Select Lamp Timer and press OK on the projector or remote control.
3. You will see the Equivalent Lamp Hour information displaying on the menu.
4. To leave the menu, press MENU on the projector or remote control.
You can also get the lamp hour information on the Information menu.

How to extend Lamp life
The projection lamp is a consumable item. To keep the lamp life as long as possible, you can do the following settings via the OSD menu or remote control.
Setting Lamp Power
Using Economic/SmartEco mode will reduces system noise and power consumption. If the Economic/SmartEco mode is selected, the light output will be reduced and result in darker projected pictures, the projector protected for longer working life.
Setting the projector in Economic/SmartEco mode also extends the lamp operation life. To set Economic/SmartEco mode, go to the Advanced menu > Picture > Lamp Power menu and press LEFT/RIGH.

Normal:  Provides full lamp brightness.
Economic: Lower brightness to extend the lamp life and decreases the fan noise.
SmartEco: Adjusts the lamp power automatically depending on the content brightness level.

Setting Auto Power Off
This function allows the projector to turn off automatically if no input source is detected after a set period of time to prevent unnecessary waste of lamp life.
To set Auto Power Off, go to the Advanced menu > System Setup: Basic > Auto Power Off menu and press LEFT/RIGHT . The time period can be set from 5 to 30 minutes in 5-minute increments. If the preset time lengths are not suitable for your presentation, select Disable. The projector will not automatically shut down in a certain time period.

How to replace the lamp

1. Turn the power off and disconnect the projector from the power outlet. If the lamp is hot, avoid burns by waiting for approximately 45 minutes until the lamp has cooled.
2. Loosen the screw on the lamp cover.

3. Remove the lamp cover by (a) pushing the lamp cover upward and (b) lifting it off.

# Do not turn the power on with the lamp cover removed.
# Do not insert your fingers between the lamp and the projector. The sharp edges inside the projector may cause injuries.

4. Loosen the screws that secure the lamp.

5. Lift the handle so that it stands up.

Use the handle to slowly pull the lamp out of the projector.

# Pulling it too quickly may cause the lamp to break and scatter broken glass in the projector.

# Do not place the lamp in locations where water might splash on it, children can reach it, or near flammable materials.
# Do not insert your hands into the projector after the lamp is removed. If you touch the optical components inside, it could cause color unevenness and distortion of the projected images.

6. Insert the new lamp into the lamp comparent and make sure it fits in the projector.

7. Tighten the screws that secure the lamp.

# Loose screw may cause a bad connection, which could result in malfunction.
# Do not over tighten the screws

8. Ensure the handle is fully laid flat and locked in place.

9. Replace the lamp cover by sliding it into place.

10. Tighten the screw that secures the lamp cover.

# Loose screw may cause a bad connection, which could result in malfunction.
# Do not over tighten the screw.

11. Restart the projector.

Do not turn the power on with the lamp cover removed.
How to reset the lamp hour
12. After the startup logo, open the OnScreen Display (OSD) menu. 

Go to the Advanced menu > System Setup: Advanced > Lamp Settings > Reset Lamp Timer menu and press OK on the projector or remote control.

A warning message displays asking if you want to reset the lamp timer. 

Select Reset and press OK on the projector or remote control. 

The lamp time will be reset to '0'.
Do not reset if the lamp is not new or replaced as this could cause damage.

Samsung Galaxy R – Disassembling procedure

Samsung Galaxy R – Disassembling procedure – How to remove the case – How to remove the battery – How to remove the front facing camera – How to remove rear facing camera – How to remove the headphone  jack

DISASSEMBLING PROCEDURE 

Insert your fingernail or a plastic tool into the opening near the headphone jack on top of the phone.
Gently pry apart the rear case from the midframe and remove.

Insert your fingernail, or a plastic tool, into the crevice on the lower left side of the back side.

Gently pry the battery from the back of the phone.

With the Phillips head screwdriver, remove all seven 4.0mm screws, highlighted in red, from the rear case.

Insert your finger or an opening tool underneath the midframe and gently pry apart from the phone.

Insert an opening tool underneath the bottom panel near the bottom left side of the back of the phone.

Gently pry the part of the motherboard that is pointed out in the picture to the left from
underneath the part of the phone that it is latched under.
Lift the bottom panel off the back of the phone.

Use tweezers to grasp the vibrator firmly and pull it away from the top panel with enough force to break the glue bond.

Insert an opening tool underneath the top panel near the top left side of the back of the phone.
Gently lift the panel from the back of the phone.

Rear Camera

The rear facing camera is located near the top center on the underside of the motherboard.
To remove the camera, flip the orange clip circled in red and pull the camera from the motherboard.

Front Facing Camera

The front facing camera is located in the top right corner of the back of the phone.
To remove the camera, gently pull until it detaches from the motherboard.

Headphone Jack

The headphone jack is located near the top left side of the motherboard.
To remove the headphone jack, gently pull on the area indicated in red until it detaches from the motherboard.

Samsung plasma TV Troubleshooting

Troubleshooting Tips – Samsung plasma TV No video audio OK- UN55B6000VFXZA - UN32B6000VFXZA -LN52B750U1FXZA - LN46B610A5FXZA – Black circle on the screen – Vertical line – Vertical black lines

Samsung Plasma TV No Video –audio OK
Often when you face the  No video, but audio is ok‖ symptom, you can easily find yourself guessing, or simply ―throwing parts‖ at the problem in order to solve it. This practice can be detrimental in many ways. Cost of repair skyrockets because of all the parts needlessly replaced, the chances of redo dramatically increase, and your first time fix rate decreases as well.
NORMAL INDICATOR LED OPERATION
First, let explain how indicator LEDs normally operate on a Plasma TV logic board.

Under normal operation (non-defective TV), the LED circled in red blinks rapidly (at least once per second). The LED in circled in blue remains unlit.

INDICATOR LED OPERATION IF THERE IS A MALFUNCTION
Here’s what happens if something goes wrong:

When there is a malfunction, the LED circled in red remains unlit. The LED circled in blue blinks approximately once every ten seconds.

Here are the steps you can follow to determine if the Y or X main boards are the source of the problem:
1. Remove the AC power cord.
2. Remove the flat ribbon cable running from the Logic board to the Y-main board.
3. Reinsert the AC power cord.

4. Test: Did the LEDs on the logic board return to normal blinking operation?

IF YES: There is a defect on the Y-main. Replace accordingly.
IF NO: Remove the AC power cord, and then go to the next step.

5. Reinsert the flat ribbon cable to the Y-main.
6. Remove the flat ribbon cable running from the Logic board to the X-main board.

7. Reinsert the AC power cord.

8. Test: Did the LEDs on the logic board return to normal blinking operation?

IF YES: There is a defect on the X-main. Replace accordingly.
IF NO: The problem does not lie on the Y or X-main boards.

Basically, the logic board LED can easily show you if the Y-main and/ or X-main boards are the cause of a  - no video, but audio is ok‖ issue. By simply removing the flat ribbon cables and cycling the power, you can pinpoint the exact board causing the issue and fix it right, without guessing, and most importantly, fix it the first time.

Tech Tips

Samsung UN55B6000VFXZA
Symptom: Distorted and violet or pink smear across top

Check the OSD menu. If the distortion affects the menu, change the panel.

Samsung UN32B6000VFXZA
Symptom: Circles on the screen.

Change the aspect ratio (P.Size),. If the circle remains in the same spot, change the panel. You can also check the internal test patterns. If it shows up, change the panel.

Samsung LN46B610A5FXZA
Symptom: When the unit is first powered on, the symptom can barely be seen. Over time, vertical lines appear, running through picture.

As you can see in this example, the OSD is affected. Replacing the T_CON and the LVDS cable will NOT cure the problem. The panel is the problem.

Samsung LN52B750U1FXZA
Symptom: There are two vertical black lines.

Check the OSD menu. If it affects the menu, change the panel.

Samsung Galaxy Tab 3 8.0 – Disassembling procedure – How to remove the case – How to replace the touch screen Digitizer

TOUCH SCREEN DIGITIZER REPLACEMENT PROCEDURE 

First start out by separating the screen from the back cover by using the larger plastic opening tool to pry them apart.

After every part of the screen is separated from the back cover you should be able to fully remove it with your hands.

Now to remove the battery you must use something small, such as tweezers to disconnect the battery from its port.
Note: the connection lifts up to remove

After the battery is disconnected you may use your hands to pull out the battery. It may be a little difficult because there is adhesive on the backside of the battery to help keep it secure, but it will come out.

Disconnect the relays attached to the motherboard.

Unscrew the 2.9mm screws from the speakers using a Phillips head #000 screw driver and then lift the speakers from the device.

Take a plastic remover tool and carefully unseat each of the electric leads currently plugged into the board.

Unscrew the 2.9mm phillips #000 screw above the battery, and the 3 to the right of the

battery.

Carefully lift the board from the device.

With a plastic remover tool, gently unseat the connection of the proximity sensor to the motherboard.

Gently wedge the plastic remover tool and pry antenna loose, and lift it from the proximity sensor. The Sensor can then simply lifted from the device.

Unscrew the 2.9mm screws from the charging port with Phillips Head #000 and use the spudger to pry it up from under the port to remove component from the device.

Samsung Dryer Error Code – DV350AEW - DV350AGW - DV350AER - DV350AGR - Test mode

Error code causes and solution

t5

Dryer Thermistor Short Sensed
The Thermistor resistance is very low.

Check for: Clogged lint screen, Restricted vent system, Thermistor resistance.

t0

Dryer Thermistor Open Sensed
The Thermistor resistance is very high.
Check for: Clogged lint screen, Restricted vent system, Thermistor resistance.

dO,dE

Door Open Running the dryer with door open

Check for: Loose or open wire terminals in Door Sense circuit.

FE

Power source frequency
Error Invalid power source Frequency Check for: Non Utility power supply

dF

Door Circuit Failure Invalid state for more than 256 milliseconds
Check for: Loose or open wire terminals in Door Sense circuit.

hE or HE

Heater Error Invalid heating Temp in running the dryer
Check for: Restricted vent system,
Thermistor resistance.

bE

Button Error PCB key closed for 75 sec. Check Display PCB for stuck button

od

Over Dry Invalid Dry Time Excessive Dry
Time Inspect sensor bars

Et

EEprom Fail Invalid state of Eeprom
communication Replace Main PCB

Gas Valve Testing

Unplug connectors and test valve terminals
(its numbering is from the front terminal.)
Check across terminals #1 and #3 (Booster Coil). 550 Ohm
Check across terminals #1 and #2 (Holding Coil). 1350 Ohm
Check across terminals #2 and #3 (Both coils in series). 1900 Ohm
Check across terminals #4 and #5 (Secondary Coil). 1300 Ohm

Cycle Count Test Mode

How to Enter:
Press Temp + Signal Keys for 3 sec during Power On State.
Press Signal for 3 seconds (until beep)
Note: Test mode subject to change without notice
Temperature Test Diagnostic Mode
How to Enter:
Press Adjust Time Up + Down Keys for 3 sec during Power On State.
Press Adjust Time Up and it will display the temperature in Celsius.
Compare vent temp to drum temp to see air flow.
This can be with just power on or dryer running.

Sensor Bar Touch Data Mode
How to Enter:
Power on dryer, open door and press in door switch.
Start dryer tumbling. Press Temp + Signal for 3 sec.
Touch both sensor bars with wet cloth, sensor hit numbers show in display.
Note: Test mode subject to change without notice

Software Version Test Mode
How to Enter:
Press Temp + Signal Keys Keys for 3 sec during Power On State.
Press Temp key for 3 seconds (until beep)
Note: Test mode subject to change without notice

Dryer continues to run after cycle completed
Wrinkle Prevent option provides approximately 90 minutes (20 continuous and 70 intermittent) of tumbling in unheated air at the end of the cycle to reduce wrinkling. Press the Wrinkle Prevent button to activate or deactivate this feature. The indicator light above the pad will illuminate when Wrinkle Prevent is selected. Chasing lights appear in the display when the Wrinkle Prevent option is selected. The load is dry, and can be removed at any time during the Wrinkle Prevent cycle.

Testing Electric Heater circuit
Disconnect Blue wire from RY6, turn power on, start dryer read voltage between RY6 Blue wire and CN6 Green wire.
Reading of 120VAC means a proper operating heater circuit. 0VAC means open in circuit.
To test thermostats use ohm meter on lowest scale, any resistance replace component

Testing Main PCB power

output to Heating & Motor circuit.
With motor running in the heating mode, read AC voltage across RY6 and RY5. Any voltage reading means Main PCB is defective.

Testing Motor circuit
With power off read resistance between RY5 Brown and CN7 Blue.
Resistance reading of good motor circuit is about 1.9Ohm. To test thermostat and switch use ohm meter on lowest scale, any resistance replace component.

Motorola Defy XT - Disassembling procedure

Switch off the mobile.

Unlock the back case before open.

Remove the battery
Remove the memory card
Remove the Sim card

Remove 6 screws

Tear off a part of label
Release the usb cover

Open the green case part by yours fingernail from left side to the right side with the usb socket

Be care of your labels
If you want to repair the SIM card slot legs, be sure no short circuits in 6 legs.

To release the PCB for cleaning the Display the the touch screen, remove 2 PARTS by fingernail.

1. Touchscreen adapter
2. Sticker between the touchscreen PCB & mobile PCB
Remove the mobile PCB much careful form top right. Be care the touchscreen circuits.

You can use a cloth, USB vacuum cleaner (be careful of the components in the green case), and adhesive tape to remove all the dust.

That finger pin is left by the Motorola Support Center in Hong Kong!!
You can also clean the camera lens on PCB

Remember to put all parts back and insert the touchscreen plugs slightly.

Put the green case back, make sure all locks is conneted

You can test the mobile before screw.

After insert the memory card, SIM card and battery, switch on the phoneTest call in and call out, also check the speakerOpen the map Apps to test Wifi and GPSBluetooth file transfer
Camera test and save in sd card
Check the sd card files
Try to connect with PC

If all works, remove the SIM card and battery.

Recheck the label is it on the top of the green case
Screws up all 6 screws
Put back all battery and SIM card
Close the back case and lock it
Close the USB cover