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Describe your Dell INSPIRON 6400 Motherboard Problem When i connect the power adapter, the adapter LED light gos off i found Aa MOSFET was short FDS4435 i change it but the problem is still existing if any expert can guide me that will be very helpful Thank you,
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1. Take the battery out of the laptop & try to turn on the laptop using power adapter only. If the computer turns on, then the battery is defective & needs to be replaced. 2. Make sure the power adapter is not defective. Test the output voltage of the power adapter using a voltmeter. Compare the voltmeter reading to the nominal value written on the adapter or the laptop. 3. If you have another processor which is compatible with your laptop's model, try swapping processors & test to see if the laptop will work. 4. The power button could be bad. 5. The motherboard could be defective & needs to be replaced.
YOu are having issue with the motherboard. ther might be a short circuit or bad part on the motherboard that might have caused it not to detect the ac adapter and system will not power on. You need to have motherboard replacement.YOu can contact dell for repair options.
Check your mains adapter plug that connects into the laptop power socket with a multi-meter, the voltage should be slightly higher than the voltage that is printed on the label on the bottom of the adapter. If the voltage is zero or way below the voltage that is printed on the label then the power adapter is faulty and needs to be replaced.
If the adapter is OK then connect it to the laptop power it up then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard.
This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. I suggest you get a quote first.
Unplug the battery from the laptop and then plug the AC adaptor into the laptop. If the green light still goes off then your motherboard is shorting out the adaptor and the motherboard needs to be replaced.
if you are really ready to pay, I suggest that you refer to Dell center closest to you. Laptops inner parts are very sensitive and should never be modified by a non-expert. Not to mention that you can't replace a transistor on the motherboard with just any other one, or else it would cause much damage, which ,I afraid, is already done in your case.
so are any of the legs of MOSFET Short ?
Make sure it not a ground.
where is this MOSFET located ?
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