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Toshiba notebook pa3299u power problem. I tested ith multi meter my power supply and it work fine. The problem si when I turn on the power then no led. not noise, nothing happen. I would like to know if somebody know which piece broke often in that case please?

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Power supplies have been known to go bad but still test good. Reason being is your more than likely only testing the output voltage and not the output amps. The amps are the most important thing, you can have your voltage but the psu may not be releasing enough amps to power the processor.

Also depending on the age of the laptop you may have a fried processor which will cause a similar senario.

Or you may have simply had someone kick the power cord while it was in the laptop and caused the dc input jack to break it's solder connections, which is usually the case i see in my shop.


Posted on Sep 23, 2009

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quick thing to try is unplug the power and remove the battery plug in the power pack and try it with the battery out.

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Try this: unplug the power supply from the laptop, remove the battery, and, while no power is being supplied to it, hold down the power button for about 10 seconds. After doing this, plug everything back in and try to turn it on. If it still does not work, you might want to test the power supply with a voltage meter (try your nearest electronics store if you do not own one). If it still does not work, it is possible that the motherboard could be dead. Also, you might want to try calling Toshiba to see if there is a known issue with your model, as this is sometimes the case.

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try another wall outlet first. if it still doesn't turn on. then you going to need a meter in order for you determine if the power supply is at fault.
put the postive (red) lead to the positive side of the power supply output lead (+) and the negative to the negative. if your read 12V on the meter. the power supply is good.
if the power supply is good. then, take out the battery out of the laptop. push and hold the power button on the laptop for 20sec (resetting the laptop). replace the battery and the AC. if that don't work. then you have other power problem.

please email me (frcs68@hotmail.com) if any additional question you may have.

thank you

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You can find a multi-meter at Radio Shack, Wal-Mart, etc. Just plug the red lead into the center of the end of the cable and the black one onto the metal 'barrel' surrounding the power supply 'jack'.

Your multi-meter should be set to 200v DC.

If your power supply is outputting near the output it should, your power supply is probably good and it is going to boil down to a bad DC input on the mainboard of the laptop.

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