Tuesday, May 10, 2016

Mitsubishi Electric WL7200U – LCD PROJECTOR – How to replace the lamp – How to reset the lamp hour Timer - How to Replace the roller filter – Roller filter counter reset – Projector repair and service

Mitsubishi Electric WL7200U

How to replace the lamp 
1. Unplug the power cord.
2. Loosen two screws (a) that are securing the lamp cover using a Philips screwdriver and remove the lamp cover (b) from the projector.
3. Loosen two screws (c) that are securing the lamp box to be removed using a Philips screwdriver.
4. Pull out the lamp box by the handle while holding the projector.
# Pull the lamp box out of the projector slowly. When the lamp is broken, glass fragments may be scattering by quickly pulling out the lamp box.
# Do not spill liquid on the removed lamp box or do not place it near any flammable object or where children can reach to prevent injury or fire.
5. Load a new lamp box securely into the projector in the right orientation.
6. Tighten two screws (c) of the new lamp box tightly using a Philips screwdriver.
# Make sure that the screws are tightened firmly.
7. Insert the lamp cover (b) into the projector and tighten two screws (a) on the lamp cover firmly using a Philips screwdriver.
# You cannot turn on the projector without attaching the lamp cover.
Reset of the lamp operation time
Plug in the power cord and reset the lamp operation time by holding down the LEFT,RIGHT, and POWER buttons on the control panel at the same time about 3 seconds.
Important:
# Unless these 3 buttons are pressed at the same time, the lamp operation time isn’t reset.
# Make sure that the STATUS indicator blinks twice and the lamp operation time is reset successfully.
# The projector doesn’t turn on if the lamp cover isn’t attached securely.
# Be sure to reset the lamp operation time whenever you replace the lamp.
# Do not reset the lamp operation time unless you replace the lamp.
# The lamp is fragile. If it is broken, be careful not to cut yourself with glass fragments.
Cleaning of the projector and the ventilation slots
Use a soft cloth to clean the projector and the ventilation grilles. When the grilles become dirty, wipe them with a soft
cloth dampened with diluted mild detergent, and then wipe them with a dry cloth.
# Clean the inside of the terminal cover frequently as dust is apt to be collected.
To protect the surface of the projector from fading or deteriorating:
# Do not spray insecticide on or inside the projector.
# Do not use benzine or thinner to clean it.
# Do not let rubber or plastic materials contact with projector.
Cleaning of the lens
Use a standard lens-cleaning brush or a piece of lens tissue dampened with lens cleaning fluid. The lens surface is
fragile. Use only recommended, nonabrasive lens-cleaning materials. Do not touch the lens with your fingers.
Roll-up filter
Setting the roll interval
You can set the roll interval of the roll-up filter using the menu.
1. Display the FEATURE menu.
2. Select FILTER MENU by pressing the UP or DOWN button.
3. Press the ENTER button.
4. Select AUTO ROLL UP PERIOD by pressing the UP or DOWN button.
5. Select OFF, EVERY 500H, EVERY 750H or EVERY 1000H by pressing the RIGHT or LEFT button.
OFF.................The filter does not roll automatically. Roll the filter manually when the filter is clogged.
EVERY 500H...The filter rolls about every 500 hours.
EVERY 750H...The filter rolls about every 750 hours.
EVERY 1000H..The filter rolls about every 1000 hours.
Important:
If you select the interval which is shorter than the current filter usage time, the filter rolls once after 1 minute.
The manual roll-up
1. Display the FEATURE menu.
2. Select FILTER MENU by pressing the UP or DOWN button.
3. Press the ENTER button.
4. Select MANUAL ROLL UP by pressing the UP or DOWN button.
5. Press the ENTER button.
Confirmation dialog appears.
6. Press the ENTER button or MENU button.
When you press the ENTER button, the filter rolls once.
To cancel the setting, press the MENU button.
How to replace the roll-up filter
When the filter rolls 9 times, the FILTER indicator blinks red. In this case, prepare a new filter cartridge. When the last filter is clogged, replace the filter cartridge. Before replacing the filter, be sure to turn off the power of the projector and unplug the power cord from the outlet.
1. Unplug the power cord.
2. Loosen two screws (a) that is securing the filter cover using a Philips screwdriver and remove the filter cover (b) from the projector.
3. Remove the roll-up filter cartridge.
5. Insert the filter cover (b) into the projector and tighten two screws (a) on the filter cover firmly using a Philips screwdriver
Reset of the roll counter of the filter
Plug in the power cord and reset the roll counter of the filter (REMAINING FILTERS and FILTER USAGE TIME) by holding down the LEFT, RIGHT and ENTER/GEOMETRY buttons on the control panel at the same time about 3 seconds.
Important:
# Unless these 3 buttons are pressed at the same time, the counter isn’t reset.
# Make sure that the FILTER indicator blinks 3 times and the counter is reset successfully.
# The projector doesn’t turn on if the filter cartridge or the filter cover isn’t attached securely.
# Do not reset the counter unless you replace the filter cartridge.



Noisy Fan – How to replace the Noisy fan of Sony Playstation 3 – Laptop repair and service

Category: Laptop Repair and Servcie 

Contents of this article 

  • How to remove the case 
  • How to remove the connections 
  • How to replace the fan 

Sony Playstation 3 

Turn the PS3 over and lay it on its backside.
Carefully peel the warranty sticker up off the lower case to reveal a hidden screw cover.
To avoid activating the VOID that may come up, heat the sticker carefully to remove and replace it cleanly.
Use the flat end of a metal spudger to pry up the seven screw covers around the edge of the lower case.
Remove the seven 37 mm Phillips screws securing the top cover to the lower case.
Remove the four 13.3 mm T8 security Torx screws beneath the Blu-ray drive opening. (Some models may only have three screws)
Lift the top cover from its rear edge and rotate it toward the front of the PS3.
Lift the top cover off the PS3.
 Squeeze the AC inlet connector's locking mechanism and pull straight up to disconnect it from the power supply.
Pull the DC-Out cables straight up to lift their connector up and out of its socket on the power supply.
 Remove the two 7.6 mm Phillips screws securing the power supply to the lower case.
Lift the power supply upward from its left edge as viewed from the front of the PS3.
 Continue to lift the left edge of the power supply until it lifts off the two metal posts shown in the second picture.
Remove the power supply from the PS3, minding any cables that may get caught.
Pull the fan cables upward to lift the fan connector up and out of its socket on the motherboard.
De-route the fan cables from under the plastic hook molded into the fan shroud.
 Remove the two 9.5 mm Phillips screws securing the fan to the heat sink.
 Lift the fan out of the heat sink, minding any cables that may get caught.

Samsung Galaxy Nexus – Disassembling procedure – USB Port replacement Procedure – Mobiles and Smartphones repair and Service

Category: Mobiles and Smartphones Repair and Servcie 

Contents of this article 

  • How to remove the case 
  • How to remove the Mother board 
  • How to replace the USB board 

Samsung Galaxy Nexus

Verizon Galaxy Nexus won't charge, charges sometimes, or thinks it's charging when it's not plugged in? It might be time to replace the micro USB connector board.
Tools Needed
An opening tool.
Small Phillips screwdriver.
A replacement micro USB board.
Start by removing the battery and SIM card.
Once the battery and SIM are out, remove all six screws from the back.
The next step is to remove the back from the phone.
Using the plastic opening tool gently pry around the edge of the screen. It should come off without too much fuss.
Next we need to remove the antenna, speaker, and vibrator assembly from the bottom.
Start by removing the screw.
Then use the opening tool to disconnect the ribbon cable.
The assembly is clipped to the magnesium body of the phone. It's not very easy to unclip, unless you have a Google GSM phone.
CDMA: Rotate the assembly counter-clockwise. I ended up breaking the clip off because I tried prying.
GSM: For my Google GSM phone, you just needed to push the clip away from the assembly.
The clip used to be here.
Next we need to detach some ribbon cables and an antenna cable from the main circuit board.
Micro USB board. Also has the front notification LED and the main microphone.
Screen connector.
Volume rocker. Some phones have this soldered to the mainboard - not CDMA.
GSM/Soldered: One user was able leave the volume rocker alone, and instead focus on the power button. You can gently separate the power button from the case – held in place only by glue - without remove detaching it from the circuit board. You can then rotate the circuit board out of your way.
Antenna.
Gently detach with the plastic opening tool.
Gently remove the main circuit board.
Keep in mind there are some ribbon cable connectors underneath the board. These should pop off easily, or you can use the opening tool to gently remove them once you have the board lifted up a bit. Also be mindful that these get reconnected with you put everything back together.
Power button cable.
Earphone cable.
The main circuit board also is connected to the main camera and the front facing camera with more ribbon cables. These should stay attached, but be delicate. You don't want to get dust in them when you seal everything back up.
Now we can finally replace the micro USB board.
It has some light adhesive holding it on. Some work with they pry tool and your fingers
should free it easily.
The board left behind some of its adhesive. Make sure to remove it.
With the broken USB board gone we can install the new one!
Peel off the adhesive backing and install the new board.
There are a number of pins and guides that make accurate installation easy.

Lenovo - M490s – Disassembling procedure – How to test the battery pack - How to test the charger – How to remove the bottom case – Laptop repair and service

Category: Laptop Repair and Service 

Contents of this article 

  • How to remove the battery 
  • How to test the battery pack
  • How to test the AC adapter 

Lenovo M490s

Power system checkout
To verify a power 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, refer to the following topics for a checkout:
“Checking the ac power adapter”
“Checking operational charging”
“Checking the battery pack”
Checking the ac power adapter
If the computer fails only when the ac power adapter is used, refer to the information in this topic to check the ac power adapter.
If the power-on indicator does not turn on, check the power cord of the ac power adapter for correct continuity and installation.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage across the plug of the ac power adapter cable. The correct voltages are shown in the following table
Note: The output voltage across pin 2 might differ from the voltage that you measure.
3. Depending on the voltage that you measure, do one of the following:
If the voltage is not correct, replace the ac power adapter
If the voltage is acceptable, do the following:
a. 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 pack 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 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
To check detailed battery status information on the operating systems, do the following:
7: Launch the Power Manager program and click the Battery tab.
8: Do one of the following:
Click Start > Solution Center > System > Battery.
Launch the Settings program from the Start screen, and then click Power.
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 terminals 5 and 7. The resistance should be 4 to 30 KΩ. 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 +12.0 V dc, recharge the battery pack. If the voltage still is less than +12.0 V dc after recharging, replace the battery pack.
If the voltage is more than +12.0 V dc, discharge the battery pack until the voltage becomes less than +12.0 V dc and then recharge the battery pack. If the voltage still is less than +12.0 V dc after recharging, 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.
DISASSEMBLING PROCEDURE 
How to remove Battery pack
Unlock the battery lock 1. Hold the battery latch in the unlocked position, and then remove the battery pack 2.
How to remove Bottom slot cover
Remove the screws 1, and then remove the bottom slot cover 2.
How to remove Base cover
Remove the screws 1 and 2.
Remove the base cover.

Monday, May 09, 2016

Sony VPL-ES7 - VPL-EX7 - VPL-EX70 – How to enter to service mode of sony projector – How to adjust the VCOM – How to adjust the white balance – Projector repair and service


Sony VPL-ES7 - VPL-EX7 - VPL-EX70

How to Enter the Service Mode
1. Power on the projector.
2. Push the switches on the remote controller or controller panel as below.
[Enter] > [Enter] > [LEFT ARROW
] > [Enter] key
3. Service mode menu will appear on the screen
Adjustment of Main Board When it is Replaced
Save the Optical Data and Replacement
1. Try to read the optical data from the faulty unit using the Emie Service tool. If succeeded in reading, replacement of the EEPROM is not necessary but the V COM Adjustment should be performed.
2. If the optical data could not be read from the faulty unit in step 1, remove the IC (EEPROM) from the faulty board and replace the IC (EEPROM) of the new board with the removed one. Reference number: U33, U48(ES7), U20(EX7/EX70)
3. Run the RGB and YUV calibration.
ADC Calibration
RGB Alignment Procedure
1. Power on the projector.
2. Input the following signal from the signal generator to the INPUT A connector.
Timing: VPL-EX7/EX70 : 1024 x 768@60Hz
VPL-ES7 : 800 x 600@60Hz
Pattern: 16 gray pattern
3. Enter the service mode and change to page “ADC Calibration”.
4. Press [RIGHT
] key to run calibration.
5. When calibration is executed, the screen brightness changes for approx. 5 seconds. After that, the screen brightness, the RGB Offset data and the RGB Gain data become stabilized.
YUV Alignment Procedure
1. Power on the projector.
2. Input the following signal from the signal generator to the INPUT A connector.
Timing: 480P
Pattern: SMPTE color bar
3. Enter the service mode and change to page “ADC Calibration”.
4. Press [
à] key to run calibration.
5. When calibration is executed, the screen brightness changes for approx. 5 seconds. After that, the screen brightness, the YUV Offset data and the YUV Gain data become stabilized.
V COM Adjustment
By the Ernie Service tool, the V COM data is not replaced. Therefore, perform the V COM Adjustment when optical data is replaced by the Ernie Service tool.
When the EEPROM is replaced, the V COM data is inherited so that the V COM adjustment is not necessary. If flicker is significant on the screen, perform the V COM adjustment.
Procedure: VPL-ES7
1. Input the 100 % flat-field signal to the INPUT A connector and allow the warm-up of 10 minutes aging at a minimum.
2. Enter the service mode and change to page 4 “Vcom & Misc” page.
3. Input the XGA, R-single color, 30 %, single-line ON/ OFF signal.
4. Move the cursor key until it is positioned at Vcom-R Normal.
5. Adjust the V com-R Normal value until flicker is reduced to minimal by [LEFT
], [RIGHT] key.
6. Change the input signal to the XGA, G-single color, 30 %, single-line ON/OFF signal.
7. Move the cursor key until it is positioned at Vcom-G Normal.
8. Adjust the V com-G Normal value until flicker is reduced to minimal by [LEFT
], [RIGHT] key.
9. Change the input signal to the XGA, B-single color, 30 %, single-line ON/OFF signal.
10. Move the cursor key until it is positioned at Vcom-B Normal.
11. Adjust the V com-B Normal value until flicker is reduced to minimal by 
[LEFT], [RIGHT key.
12. Reverse the “Image Flip” upside-down and right-toleft, and repeat the above adjustment procedure from step 2 to step 11.
Procedure: VPL-EX7/EX70
1. Input the 100 % flat field signal to the INPUT A connector and allow the warm-up of 10 minutes aging at a minimum.
2. Enter the service mode and change to page 4 to select “Vcom & Misc”.
3. Input the XGA, G-single color, 80 %, flat-field signal.
4. Move the cursor key until it is positioned at Vcom-G Normal.
5. Adjust the V com-G Normal value until flicker is reduced to minimal by 
[LEFT], [RIGHT key.
6. Change the input signal to the XGA, R-single color, 80 %, flat-field signal.
7. Move the cursor key until it is positioned at Vcom-R Normal.
8. Adjust the V com-R Normal value until flicker is reduced to minimal by 
[LEFT], [RIGHTkey.
9. Change the input signal to the XGA, B-single color, 80 %, flat-field signal.
10. Move the cursor key until it is positioned at Vcom-B Normal.
11. Adjust the V com-B Normal value until flicker is reduced to minimal by 
[LEFT], [RIGHT key.
12. Reverse the “Image Flip” upside-down and right-toleft, and repeat the above adjustment procedure from step 2 to step 11.
White Balance Adjustment
Preparation before adjustment
Input the 100 % flat field signal to the INPUT A connector and allow the warm-up of 10 minutes aging at a minimum.
HIGH Mode of PC
1. Input the 80 % flat field computer signal to the INPUT-A connector.
2. Set the picture quality mode to STANDARD, and set color temperature to HIGH.
3. The target chromaticity (x, y) is (0.282, 0.299).
4. Enter the service mode and change to CXD9809-Page
2 (ES7) or White Balance 1 page (EX7/EX70).
5. Adjust the PC Hi Gain-R and PC Hi Gain-B until the target chromaticity (x, y) as shown is obtained.
6. Repeat steps 2 to 5 until the chromaticity (x ±0.002, y ±0.002) with reference to the target chromaticity (x, y) is obtained.
MIDDLE Mode of PC
1. Input the 80 % flat field computer signal to the INPUT-A connector.
2. Set the picture quality mode to STANDARD, and set color temperature to MIDDLE.
3. The target chromaticity (x, y) is (0.390, 0.321).
4. Enter the service mode and change to CXD9809- Page4 (ES7) or White Balance 3 page (EX7/EX70).
5. Adjust the PC Mid Gain-R and PC Mid Gain-B until the target chromaticity (x, y) is obtained.
6. Repeat steps 2 to 5 until the chromaticity (x ±0.002, y ±0.002) with reference to the target chromaticity (x, y) is obtained.
LOW Mode of PC
1. Input the 80 % flat field computer signal to the INPUT-A connector.
2. Set the picture quality mode to STANDARD, and set color temperature to LOW.
3. The target chromaticity (x, y) is (0.312, 0.334).
4. Enter the service mode and change to CXD9809-Page
2 (ES7) or White Balance 1 page (EX7/EX70).
5. Adjust the PC Lo Gain-R and PC Lo Gain-B until the target chromaticity (x, y) is obtained.
6. Repeat steps 2 to 5 until the chromaticity (x ±0.002, y ±0.002) with reference to the target chromaticity (x, y) is obtained.
HIGH Mode of VIDEO
1. Input the 80 % flat field 480/60i or 575/50i signal to the INPUT A connector.
2. Set the picture quality mode to STANDARD, and set color temperature to HIGH.
3. The target chromaticity (x, y) is (0.282, 0.299).
4. Enter the service mode and change to CXD9809-Page
3 (ES7) or White Balance 2 page (EX7/EX70).
5. Adjust the PC Hi Gain-R and PC Hi Gain-B until the target chromaticity (x, y) is obtained.
6. Repeat steps 2 to 5 until the chromaticity (x ±0.002, y ±0.002) with reference to the target chromaticity (x, y) is obtained.
LOW Mode of VIDEO
1. Input the 80 % flat field 480/60i or 575/50i signal to the INPUT A connector.
2. Set the picture quality mode to STANDARD, and set color temperature to LOW.
3. The target chromaticity (x, y) is (0.312, 0.224).
4. Enter the service mode and change to CXD9809-Page
3 (ES7) or White Balance 2 page (EX7/EX70).
5. Adjust the PC Lo Gain-R and PC Lo Gain-B until the target chromaticity (x, y) is obtained.
6. Repeat steps 2 to 5 until the chromaticity (x ±0.002, y ±0.002) with reference to the target chromaticity (x, y) is obtained.