Phantom 410 case power LED broken?

[kamechi]

Hi i need some help, i have a phantom 410 white and recently i found the power LED is not lightning up anymore.

i also have asrock z77 extreme 4 and i pretty sure i plug in the correct pwr LED+ / pwr LED- cable.

how can i fix it? is it mobo faulty or the LED faulty?

 

[Harvey]

Three possibliities:

1. The LED is bad.

2. The wire and/or connector to the LED is bad.

3. The logic on the motherboard that turns on the LED is bad.

If you unplugged any of the wires in the bundle from the front panel, could you have reversed the power LED connector to the motherboard?

Check the connection diagram for your motherboard to ascertain which of the two pins is supposed to connect to the positive lead. Typically, in the wire bundle from the front panel, the positive (+) each component is a unique color, and the negative (-) wires are all the same color, uaually white or black.

Testing the LED, wire and connector:

You can test the LED, itself, with a couple of clip leads, a 1/4 watt resistor (~1000 ohms), a 9 volt battery or other low volage DC source from your motherboard and a piece of solid wire or even sewing pins.

1. Plug the solid wire into one terminal of the connector on LED wire pair.

2. Plug the solde wire from one end of the resistor into the other connector on LED wire pair.

3. Connect the positive terminal of the power source to the other end of the resistor.

4. Connect the negative terminal of the power source to the solid wirei (alreadh connected to the connector from the LED). The light may be dimmer than you normally see. The resistor limits the current to protect against burning out from too much current or a reversed connection, either of which which could damage the LED.

If the LED lights up, it's good. The resistor will probably keep the light level dimmer than you're used to seeing. If it doesn't light up, reverse the power connection. If it still doesn't light, either the LED or the wire/connector to it is bad.

If your voltage source is low (5 volts), you can try a slightly lower resistor value (~500 ohms) to provide more current to the LED.

You might be able to do a quick and dirty test of the LED by connecting the leads from a multimeter set to measure resistance (ohms). When measuring resistance, the meter provides the required current at a safely limited level without the need for an external resistor. Various makes of meters differ so the polarity of the current from the meter may be positive at either the red or the black lead. If it fails in one direction, reverse the connection.

You can test the motherboard logic by connecting a voltmeter across the two pins on the motherboard's LED power terminals while the mechine is running.

Hope that helps.

 

[kamechi]

i tried plug HDD power lead cable into the PWR lead on the motherboard and it light up. so i guess is the pwr LED faulty. How can i replace it? Do i have to cut off the old one?

 

[Harvey]

You'll have to disassemble enough of the case and/or front panel far enough to get access to the LED to deterine is whether the LED is actually replaceable, due either to how it's mounted or how it's attached to the wire pair. You may have to clip the wires from the old LED and solder them to the new one before or after it's mounted in place.

If you can remove the LED, determine it's size. There are standard names for various LED sizes that define the shape and dimensions. Then, find a replacement for that size and color LED, attach the wires and replace it the way it was mounted.

Note - Before clipping the wires from the LED, the longer of two leads is positive (+).