Archive for the ‘Things You Should Know’ Category

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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Maxim8725ETI IC Battery Control.

General Description The MAX1909/MAX8725 highly integrated control ICs simplify construction of accurate and efficient multichemistry battery chargers. The MAX1909/MAX8725 use analog inputs to control charge current and voltage, and can be programmed by a host microcontroller (?C) or hardwired. High efficiency is achieved through use of buck topology with synchronous rectification. The maximum current drawn […]

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Battery charging issue.

Some charge circuit may use 12v FET gate to verify that POWER IN is correct. If the power is too low, it will not charge.

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Main Power Supply Controller For Notebook Computers MAX8723A

General Description The MAX8732A/MAX8733A/MAX8734A dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX8732A/MAX8733A/MAX8734A include two pulsewidth modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output […]

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Soldering Flux

Flux: It does two things. It deoxidizes the tinned post, as well as spreading heat more evenly.

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Power Drain Procedure

With an extensive use of the notebook, some times notebook would store some static charges which indeed will stop the notebook from powering up or charging the battery. The procedure to remove this static charges from the notebook is known as power drain. Performing a power drain procedure will not effect any personal data or […]

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Laptop and Liquid

Laptop Kill: Liquid Laptops hate drinks, any kind of them. Some may tolerate a small sip of vodka or scotch on the rocks, but that’s about all. Any other kind of drink – coffee, tea, wine, pop or any soft drink will kill them almost instantly. I’ve been dealing with laptops for quite a long […]

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Heat and Dust

The most important part of your laptop that needs to be clean is… the heatsink. Yes, heat is the “cause of death” for most laptops. The heat not only causes all components to expand and contract a little (as you turn it on and off), but will also reach dangerously high levels and make your […]

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