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Posted on Jan 02, 2017
SOURCE: i have an LG laptop
First, I would recommend you bring the laptop in a well-lit room, try to power it on, look closely at the screen and tilt it back and forth. You may see a dark image of what you're supposed to see, and, if so, that means your laptop's back light is out. If you still see nothing, try to attach the external monitor and power cycle the laptop a few times and try to hit the LCD/CRT button, which is usually (Fn + F4). If you still can't get any display, there is likely something wrong with the laptop's motherboard, which is often an expensive repair. It is usually more sensible just to replace the laptop than attempt to have it repaired.
Posted on Aug 27, 2011
The test is to bypass the Power On switch.
If the Power Supply comes on you have a bad $5 Power On switch.
If the Power Supply does Not come on you have a bad Power Supply.
The test does Not involve the Power On switch itself, and there is No splicing of wires.
Let's take a look at a basic example of a motherboard, for a Dell Optiplex GX240,
Looking at the photo, look at the long whitish connector at the top left. It is on the far side of the Ram Memory slots, and next to the round CMOS battery. This connector has two rows of 10 socket holes.
Another basic view, using the System Board illustration from the Service Manual, on Dell Support,
Number 27 - Main power connector, points to it.
The power cable that connects to it is a 20-pin ATX main power cable.
Observe the photo to the right, and view the Green wire.
The Green wire is the Soft Power On wire. (Abbreviated as PS_ON)
ALL <- of the Black wires you see are Ground wires.
A jumper wire is used to Briefly connect the Green wire, to ANY Black wire.
(The Power On switch is a Momentary Contact Switch)
The preferred jumper wire is a paper clip.
The paper clip is straightened out, then bent into a U-shape. The top of the U is wrapped a few times with black plastic electrical tape. This taped area is for your fingers, and thumb to hold onto.
U-shape jumper wire turned upside down, the 'legs' are what is used.
One 'leg' of the jumper wire goes down into a socket hole, with the Green wire.
The other leg goes down into ANY socket hole, with a Black wire in it.
This is with the 20-pin ATX main power cable plugged into the motherboard, just as is shown in the photo to the far right.
The 'leg' of the jumper wire goes down into the socket hole,
RIGHT NEXT TO, the existing wire already in the socket hole.
Slides down past the insulation of the wire.
(Goes in the Back of the connector. Where the wires go into the connector, is the Back of the connector)
At the end of every wire going into that main power cable connector, is a metal terminal. The jumper wire 'leg', MUST slide down past the insulation of the wire, and Touch that metal terminal.
The tip of the metal terminals for the wires, can be seen in the middle photo.
(This is what the metal terminal looks like, not crimped on a wire,
Power supply plugged into power, the jumper wire legs are inserted down into the 2 socket holes.
The contact made is no more than 2 seconds.
Power Supply comes on you have a bad Power On switch.
Power Supply does Not come on you have a bad Power Supply.
(Voltage for the Soft Power On circuit is 5 Volts DC.
In comparison two D cell flashlight batteries store 3 Volts DC.
May be a small spark when you connect. Just the way electricity works.
You may wish to wear a glove on the hand for the jumper wire)
This is one example of a ATX Power On switch, that is used in a LOT of desktop computers. It is inside the plastic assembly of the Power On button,
IF you go to buy a Power Supply, LOOK at the shape of the Power Supply's case presently in your computer.
If it is a Small Form Factor (SFF) GX240, there is only one style that will fit.
The other styles of the GX240 use a basic ATX form factor Power Supply.
(SFF style of Power Supply looks like this,
ATX style looks like this,
Computer unplugged from power, ('natch), and computer case open, FOLLOW Anti-Static Precautions.
Dell Optiplex GX240 Service Manual,
For additional questions please post in a Comment,
Posted on Jul 31, 2012
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