subject: Laptop Can Not Use The Power Adapte [print this page] 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.Dell Inspiron 1501 Adapter
