NEC LCD1770NX Capacitor Replacement

はじめに

There are many capacitors on the power supply board that control the amount of power delivered to the monitor. If a capacitor is swelling at the top or appears to have burst, it may need to be replaced.

必要な工具と部品

手順1 Stand

NEC LCD1770NX Capacitor Replacement, Stand: 手順 1、 2の画像 1

NEC LCD1770NX Capacitor Replacement, Stand: 手順 1、 2の画像 2

Place the monitor face down on a clean, flat surface.

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手順2

Firmly remove the back panel of the stand by pulling it up and away from the monitor.

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手順3

Unscrew the two 6mm Phillips PH2 screws to detach the stand enclosure from the stand.

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手順4

Firmly grasp the stand enclosure with your hand and slide it to base of stand.

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手順5

Unscrew the two 14.5mm Phillips PH2 screws holding the stand to the monitor.

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手順6

Lift the the stand straight up to remove it.

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手順7 Monitor Enclosure

NEC LCD1770NX Capacitor Replacement, Monitor Enclosure: 手順 7、 3の画像 1

NEC LCD1770NX Capacitor Replacement, Monitor Enclosure: 手順 7、 3の画像 2

NEC LCD1770NX Capacitor Replacement, Monitor Enclosure: 手順 7、 3の画像 3

Place the monitor screen face up.
Pull the frame off by placing your fingers on the inside of the frame and pulling out and up, the frame should snap off.
Continue your way around the screen.

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手順8

NEC LCD1770NX Capacitor Replacement: 手順 8、 3の画像 3

Unscrew the two 7mm screws from the bottom of the button assembly.
Do not pull the button assembly out too quickly or with too much force! Damage to the wires can occur.
Pull the button assembly out a few inches and unplug the colored cables.

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手順9

Unscrew the gold colored 7mm Phillips PH000 screw holding the button assembly to the monitor.
Remove the button assembly from the monitor.

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手順10

With the monitor face-down, unscrew the 5 7mm Phillips PH2 screws around the outside of the enclosure.

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手順11

NEC LCD1770NX Capacitor Replacement: 手順 11、 3の画像 3

Unscrew the 2 14.5mm Phillips PH2 screws located on the raised center of the enclosure.
Carefully pull the enclosure off the monitor.

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手順12

Unscrew the 10 5mm Philips PH2 screws holding the metal casing to the monitor.

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手順13

Pull the the metal casing off of the monitor to reveal the motherboards.

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手順14 Power Circuit Board

NEC LCD1770NX Capacitor Replacement, Power Circuit Board: 手順 14、 3の画像 1

NEC LCD1770NX Capacitor Replacement, Power Circuit Board: 手順 14、 3の画像 2

NEC LCD1770NX Capacitor Replacement, Power Circuit Board: 手順 14、 3の画像 3

Make a note or use a pen to mark which plugs correspond to which colors. (Pink or Blue)
Remove the four plugs on the brown circuit board by pulling up on the tabs and wiggling them out. You could also use a spudger to help you lift little clips holding them in.

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手順15

NEC LCD1770NX Capacitor Replacement: 手順 15、 3の画像 3

この手順で使用する道具：

Large Needle Nose Pliers

$4.99

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Locate the several multi-wire connectors on the board.
These connect several parts of each board together and consist of several different colors of wires. There is also a zip-tie holding the two sets of wires together that you can cut if it is getting in your way.
Disconnect the three plastic connectors from the blue colored boards by pulling them up while wiggling them.
Some force is necessary, it may also help to use the Large Needle Nose Pliers.

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手順16

この手順で使用する道具：

Phillips #1 Screwdriver

$5.49

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Locate the large black power plug.
Using a Phillips #1 Screwdriver, unscrew the two 8mm colts holding the black tabs to the metal frame.

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手順17

Locate and remove the gold colored 10mm Philips screw located near the black power plug. It holds in a wire that connects to the power plug.

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手順18

Remove 5 8mm Phillip1 screws, with a Philips 1 screwdriver, located in various places on the board.

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手順19

Lift the brown power supply board off of the frame and set it aside.

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手順20 Capacitor

NEC LCD1770NX Capacitor Replacement, Capacitor: 手順 20、 1の画像 1

Find the faulty capacitor on the board.
Bad capacitors can be identified by swelling or bursting at the top.

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手順21

Flip the board over and find the corresponding solder joints. Capacitors have two joints on the opposite side of the circuit board.
Make sure you identify the correct solder joints! We wouldn't want you to desolder the wrong component!
Remember which direction the white stripe on the capacitor is facing! Orientation is important for a capacitor! The markings on the board should also remind which way to face the capacitor.