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Notebook Power

September 28th, 2004

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The varistor short-circuit, will make notebook power adapter into the protection of the state

a Twinhead A1000 laptop, because without the power adapter with first wife, he borrowed another model Twinhead notebook adapter, but plug adapter, notebook batteries are still working in the state. Then changed back into Original power adapter, can laptop battery is still only work in the state, can not use the power adapter.

Analysis solution: Since notebook battery state can still work, and it is suspected fault is near the notebook Power Interface circuit damage caused. Re-insert the power adapter laptop power connector, insert an instant interfaces found in some blue sparks, and you can hear a slight "pop" sound. Conclude that, in the notebook power connector near the short circuit phenomenon, leading to the power adapter into the protected status as over-current. Open the notebook, power connector with a multimeter to test resistance at both ends, showing zero, and sure enough there is short circuit.

Closer look at the components near the power connector, no obvious burning phenomenon. Trends through the interface of copper, found near a power interface components, connecting the power terminal and ground. According to circuit analysis, this should be an over-voltage protection resistor (varistor), in the normal state, its resistance is infinite, and if the input voltage exceeds its rated voltage, resistance will be short, to avoid excessive voltage damage to notebook other components. The varistor short-circuit, will make notebook power adapter into the protection of the state, to avoid failure of magnification. Then remove the resistor, and then get put on the same specifications of the resistance to re-boot, laptop back to normal.
Toshiba PA3468U-1ACA Adapter

Dell Inspiron 8600 Adapter

Dell Inspiron 1501 Adapter

Dell Inspiron 6000 AC Adapter

Acer Aspire 3500 Adapter

HP Pavilion DV9000 Adapter

Dell Inspiron 600m Adapter

Dell Inspiron 6400 Adapter

Toshiba PA3467U-1ACA Adapter

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Dell Latitude E7450 Laptop Parts Repair NO BOOT DOES NOT POWER ON
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NEW Antec NP90 Notebook Power Adapter 19 Volt 90 Watt With 7 Tips AM
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Antec NP65 Universal 65W Notebook Power Adapter 7 Tips NEW AM
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HP NOTEBOOK SMART POWER ADAPTER BRAND NEW
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45W Universal AC Adapter Power Supply Wall Charger for Laptop Asus Hp Notebook
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