Having problems with your IBM ThinkPad T21 2647 Notebook ?

Thinkpad T21 won't start on battery alone. Works OK with adapter

\015 When pressing power button (only battery connected, No charger) green indicators go ON for a fraction of a second and that's all (I think I hear the blower making a few cycles). I disconnected the battery and pressed the power switch many times+ pressed it for half a minute, all this to try and discharge the alleged overcharged starting capacitor, but to no avail. I'm afraid it all started when I connected a defective charger to the system.Does anyone know the 'start up' circuitry? where is it located? what are its main components? Which pis of the keyboard-to-mainboard connector are involved?\015

Answers :

The power comes into the plug on the back of the computer. This connects it to metal traces inside the mainboard of the computer. These will be connected to voltage regulators which often output 5 volts, 12 volts, 3.3 volts, and the CPU voltage; they sometimes look like the image at right.\015\012These will be connected to cylindrical capacitors distributed throughout the mainboard. Capacitors act like tiny, fast batteries, supplying extra power where needed to maintain a steady voltage during high demand.
\015\012
\015\012Anywhere in your laptop, physical or electrical damage can cause a short circuit. A short circuit will consume all available power, causing your laptop to not turn on. If your power adapter LED comes on when you plug it into the wall, but then goes off when you plug in the laptop, you probably have a short circuit.
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