Dell 1800 fp screen blown power board

[jepezus]

the wire diagram for a dell 1800 fp if your power supply is blown

[jepezus]

Re: Dell 1800 fp screen blown power board

there is only one wire cabel that is like this so its easy to fix it no need to worry about the power for the backlight its on the smaller board that gets power from the molex if your done making the connector keep in mind not to exceed 1 mtr of cabel becouse if you will it will not give you any screen @ all

[Wizard]

Re: Dell 1800 fp screen blown power board

That is because the device to be powered doesn't have sufficient capacitors, due to cable length and resistance (thin wires are like that) is enough to drop voltage and increased ripple.

Careful with the color and labeled wires, this one you show is poorly drawn. Be accurate. There are many who take this at face value and their monitor blows up.

Cheers, Wizard

[Wizard]

Re: Dell 1800 fp screen blown power board

That is because the device to be powered doesn't have sufficient capacitors, due to cable length and resistance (thin wires are like that) is enough to drop voltage and increased ripple.

Careful with the color and mislabeled wires, this one you show is poorly drawn. Be accurate, put info on which is which for each wires. There are many who take this at face value and their monitor blows up.

Also, there is no such as -5v and +5v WITHOUT ground. We always draw ground if the pins measures fraction of ohm to the chassis ground.

Just a note: very rarely a unit might have isolated supply island that is seperated from main ground, especially in units that have audio. I see this occassionally in TVs and some good audio combined with other systems in one. That will have extra text to the voltages like this for example: It is easily seen when you study one of those power supply that measured with no connection between audio supply and the other supplies especially ground paths. And good designer always put for every wire of power gets at least one ground wire to prevent ground loops through other chassis if number of ground wires is insufficient. Generic units are notorious for skimping on this.

12V
12V
5V
ground
ground
ground
audio_ground
audio_ground
audio_+24V
audio_-24V <---sometimes have dual supply with this -V supply when a ampifier uses pull-push design (better than most single supply audio amp.)

Cheers, Wizard

[jepezus]

Re: Dell 1800 fp screen blown power board

well poorly drawn you can clearly see that wire 1(blue) and 2 are connected together 3 and 4, 5 and 6, 7 and 8 and the negative 5 is ground thats on the pc power suply and the negative 12 is ground also

[jepezus]

Re: Dell 1800 fp screen blown power board

the color of the wires is as they are one blue and the others are all grey, and the molex are the standard colors dont wanna be rude but even my boss who has no knowledge of electronic understands what i have drawn.

[EGuevarae]

Re: Dell 1800 fp screen blown power board

the color of the wires is as they are one blue and the others are all grey, and the molex are the standard colors dont wanna be rude but even my boss who has no knowledge of electronic understands what i have drawn.

You would be surprised the kind of people that lurks around here.