Electro help

Wednesday, March 05, 2014

LG RAD 225B - RAS 225 [HTS] - POWER SUPPLY & POWER AMPLIFIER - SCHEMATIC [CIRCUIT DIAGRAM]

POWER AMP

SMPS

CLICK ON THE SCHEMATICS TO MAGNIFY

Tuesday, March 04, 2014

KEYBOARD REPLACEMENT- HP Compaq Notebook nc4000 Series (User Repairable)

Prepare to replace the Keyboard:

Turn off the notebook.

Disconnect the AC adapter and all external devices.

Remove the battery pack by following these steps:

a. Turn the notebook bottom side up with the front facing forward.

b. Slide and hold the battery release latch [1] to the left. The rear edge of the battery pack releases from the notebook.

c. Lift the rear edge of the battery pack up and swing it forward [2].

d. Remove the battery pack.

LED switch cover removal

Close the notebook and turn it bottom side up with the rear panel facing forward.

Remove the two T8M2.0×8.0 screws that secure the LED switch cover to the notebook.

Turn the notebook topside up with the front facing forward.

Open the notebook as far as it will open.

Press down on the (esc) key 1 to reveal the notch 2 in the left side of the LED switch cover.

Insert a flat-bladed tool into the notch and lift the left side of the LED switch cover 3.

After the left side of the LED switch cover has disengaged from the notebook, swing the LED switch cover up and to the right.

Remove the LED switch cover.

Close the notebook and turn it bottom side up with the rear panel facing forward.

Remove the T8M2.0×8.0 screw that secures the keyboard to the notebook.

Turn the notebook topside up with the front facing forward.

Open the notebook as far as it will open.

Lift the rear edge of the keyboard 1.

Slide the keyboard toward the display 2 until the notches on the front edge of the keyboard clear the top cover.

Swing the front edge of the keyboard up and back 3 until it rests on the display.

Release the zero insertion force (ZIF) connector 1 to which the pointing stick cable is attached and disconnect the pointing stick cable 2 from the system board.

Release the ZIF connector 3 to which the keyboard cable is attached and disconnect the keyboard cable 4 from the system board.

Remove the keyboard.

Reverse the above procedure to install the keyboard.

Monday, March 03, 2014

HOW TO DISASSEMBLE [OPEN] - DELL-S1709WC - LCD MONITOR

TO REMOVE STAND

Remove the two screws and remove the stand.

Pull out the hinge cover follow the arrowhead direction and remove it, then remove the hinge.

Click on the pictures to Zoom In

Remove the two screws and remove the base.

Pry the monitor up then find out the hooks’ position, use the tool (like the picture or other card) to insert into the gap of bezel and rear cover, then turn over the monitor and take off the rear cover.

Remove the one screw and remove the keyboard.

Disconnected the keyboard connector.

Remove the screw and remove the small cover shield.

Remove the screws and then remove the shield.

Remove the screws remarked in red and disconnect connector remarked in green.

Remove the screws and remove the main frame.

Note: Make LVDS connector’s metal side down.

DELL S1709WC - 17" LCD Color Monitor - POWER 7 INVERTER - SCHEMATIC [CIRCUIT DIAGRAM]

SMPS [POWER]

INVERTER [BACK-LIGHT]

CLICK ON THE SCHEMATICS TO ZOOM IN

Sunday, March 02, 2014

HP Pavilion Notebook PC - HOW TO REPLACE KEYBOARD [User Replaceable]

KEYBOARD REPLACEMENT (User Replacable)

1. Unplug the AC adapter, if present, and then remove the battery.

2. Remove the keyboard cover.

3. Remove the four M2.5×4.0mm screws that secure the keyboard to the top case.

4. Lift up on the keyboard at the switchboard PCA end, and then pull it toward the display assembly to release the tabs from the top case.

5. Turn the keyboard over, and then disconnect the motherboard cable.

6. Remove the keyboard. [Do not excessively bend or fold the keyboard cable. Excessive flexing can damage the keyboard cable connectors.]

Lay the keyboard face down on the top case, forward of its normal position, and then reconnect the keyboard cable.

Slide the metal tabs on the bottom of the keyboard into their slots in the top case, and then lower the keyboard into place.

Removing the Keyboard Cover

1. Unplug the AC adapter, if present, and then remove the battery.

2.Remove the two M2.5×4.0mm hinge cover screws that secure the keyboard cover to the rear of the notebook.

3. Carefully insert a flat-blade screwdriver blade under the keyboard cover near the right end, and then near the center, then near the left end, and then gently lift up the center of the cover. Gently pry up the hinge covers if needed, being careful not to damage the plastics or wireless antenna underneath.

4. If necessary, while holding the center of the cover, carefully insert the flat-blade screwdriver under the right side of the display assembly hinge, gently pry up, and then lift the cover out. This procedure might need to be repeated on the left side of display assembly hinge to completely remove the cover.

Be careful not to damage the antenna PCA that is connected to the left and right display assembly hinges. Damaging either antenna PCA can degrade notebook performance.

DISASSEMBLE [OPEN] - SONY KDL40U4000 - LCD TV - LED BLINKING CODES

LED BLINKING CODES

The identification of errors within the EG1L-L chassis is triggered in one of two ways: - 1: Busy or 2: Device failure to respond to IIC. In the event of one of these situations arising the software will first try to release the bus if busy (Failure to do so will report with a continuous flashing LED) and then communicate with each device in turn to establish if a device is faulty. If a device is found to be faulty the relevant device number will be displayed through the LED (Series of flashes which must be counted).

LED ERROR CODES