Archive for the ‘All Other Laptop Issues’ Category

Protected: Testing AC adapter with multimeter.

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Spyware removal software

Is your computer suddenly running sluggish, and unknown toolbars and pop-ups have started appearing everywhere. Microsoft Safety Scanner to the rescue! This portable anti-malware utility requires no installation, meaning it can run from a flash drive — a mighty handy option for troubleshooting a PC that’s so bug-ridden, it can’t even get online. Thanks Microsoft […]

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How to test AO4407 MOSFET

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Common components on laptop motherboard.

Inductor

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Buzzing niose

A bad choke coil usually makes a buzz noise. If the noise is a whine the problem is usually a capacitor.

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AC Adapter Doesn’t Work

Verify that the AC adapter brick is receiving power.  Shut down the computer and unplug the adapter from the system first and then from the power socket. Wait 5 seconds. Plug the adapter directly into the wall socket, bypassing surge protectors, UPS units, or extension cords. The adapter LED should produce a steady green light. […]

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BIOS Recovery Disk

Try a BIOS recovery disk if you think your computer no longer posts due to a corrupted BIOS. More info

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How to test for shorted circuit

To test for shorts set your digital multimeter to resistance.  Connect the red probe to the positive pad on the systemboard and the black probe to the negative pad(ground). If it shows less than 0.5 ohms meaning there is a short in the circuit.

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Replacement AC adapter

Ok, You tested the AC adapter and it’s dead. So it’s time to shop for a replacement AC adapter.  Original AC adapter cost 3 to 5 times more than a generic AC adapter.  Avoid generic AC adapter if all possible.  However, if you do decide to replace the original AC adapter with a generic one, you’ll have to […]

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How to locate short circuit.

Using a workbench power supply: You can use a regulated power supply to locate a shorted component.  Connect the negative output to the ground and positive to the fuse.  Slowly vary the output voltage and keep an eye on the current drawn. Soon as the current drawn about an amp or two, place your finger […]

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