Question about Dell Inspiron 700M Notebook
Normally the AC adaptor gets fried, the fuse inside the plug that goes into the mains normally blows. If you are getting power to the laptop in some form, you should first of all check the adapter.
Plug this into the mains and, with a multimeter set to 20 volts DC place the red probe onto the inner jack pin, and the black probe to the outer part of the jack, see if the voltage reading is 20 volts, give or take a volt. ONLY do this if you have first inspected the charger, check for any burning smell or melting of the case or wires (to be safe).
If the voltage is correct, (remember that dell laptops will only charge with genuine Dell chargers), the charger may be powering the laptop but NOT charging it..If you can, try and obtain another Dell charger to eliminate the charger being at fault.
Now remove the battery, press and hod the power button for 30 seconds and try it on ac power alone, a fried battery will sometimes stop the laptop from booting, if it DOES boot, the battery has been damaged (possibly the battery charge circuit too).
If it does NOT boot, the problem lies on the motherboard. There is, near the charger port on the motherboard a small ceramic fuse of about 3mm length with metal caps. This may look intact but if again, you apply a multimeter set to 10 Ohms across the terminals of the fuse and do not get a reading, the fuse is dead and will need replaced. I normally bridge the fuse connections with a soldered wire of 3 amps but this is NOT a recommended fix long term
If the laptop still does not boot, there is a resistor or possibly a capacitor blown, remove the motherboard fully and check , you will see a blown resistor as it will appear charred and blackened, whilst capacitors tend to burst at the top (usually).
In this case, it is probably not worth the cost of fixing.
If the laptop does boot, but does not charge even with a new charger, look at the motherboard again, near the battery I THINK there is a similar ceramic fuse for the battery charging circuit, check this also
Posted on Jul 28, 2011
Testimonial: "Thank you for your comprehensive diagnosis. I will check it our and get back to you"
Thiere is no fuse to replace, unlike some other devices you may be familiar with.
However, there are many components that could be affected, such as the motherboard, CPU, and battery.
Disconnect the power adapter, flip over the laptop and remove the battery. Reconnect the power adapter and see if the laptop powers on. If it does, replace your battery. If it does not power on have your laptop checked. Could be a fried motherboard.
Hope this helps.
Posted on Jul 28, 2011
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Posted on Jan 02, 2017
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