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The problem is in the power supply adapter, or the dc jack in the laptop is loose, if you move the cord from the power adapter to the computer and it comes back on then it is more than likely the dc jack in the laptop that is attached to the motherboard. The remedy is to replace the dc jack or resolder the old one, in order to do this the computer must be taken apart down to the main board for service.
Most probably, your friend disconnected the cable connecting the touchpad to the motherboard while disassembling the laptop to fix the DC power pin, & forgot to reconnect it back. You will need to partially disassemble the laptop again & reconnect the touchpad to the motherboard.
Reconnecting the video cable should be too hard. I'm not an expert on the model mentioned but have worked on several different laptops and know my way around them.
Remember to unplug from power, and remove the battery before starting.
Also, you may want to search for a field or repair manual on the toshiba website.
I would probably start with removing the keyboard to see what you're working with. The cable may br right there in plain view. If it looks like you hit a dead end, try from the bottom of the laptop. You'll know where to plug it back in because it wont be a very long cable, probably flat, and will only fit into one place.
Sounds like you may have gotten the polarity of the wires mixed up, or the two connections are shorting somewhere. If you heated the wires too much they may have melted through the insulation and short circuited. You may also have a bad connection inside the computer portion of the jack - or the input, and may have to be soldered back onto the board - entails disassembling some of the laptop.. One other possibility is that the output cord to the powerjack is no good and if you can find another cord with the same type of male plug for it you could break the case apart, solder on a new (used) cord.
An Ohm meter comes in handy here but a simple 1.5 volt light with a battery in line can be a cheap meter for testing stuff. Hope this helps. Could stick your tongue on the end of the wires to see if you have voltage but I would do it quickly and hope you don't have a bad heart. 20 volts shouldn't hurt you, especially if your not standing in a puddle or have a pace-maker. 4 amps is a lot though, as it only takes 1 amp to kill you.
you have to strip down the laptop so you can access the underside of the motherbord then you need to desolder the solderd connectors and remove the DC jack then put the new DC jack in its place and solder back in place please note this is quiet a big job and requires knowlage of laptops
If the old one works you have another power supply or wrong one. Check the properties of your power supply.
Related to your issue you also may consider this:
1.- Computer AC / DC cable is bad not allowing the computer battery to charge. 2.- Battery is bad. 3.- Battery charger board is bad.
Solutions: 1.- Computer AC / DC cable is bad not allowing the computer battery to charge
Verify that the AC and or DC cable is not bad by testing the computer only with the power plug connected and the battery out of the laptop. 2.- Battery is bad
It is possible that if the power plug is good that the computer battery is bad. Leave the computer connected to the power with the battery connected in the computer for at least one hour; if the battery does not charge, consider having the battery and/or the laptop serviced or repaired.
If the computer and/or battery is not in warranty consider just replacing the battery as it is very likely that it is just a bad battery. 3.- Battery charger board is bad
If the battery has been replaced or an alternate battery from an alternate identical laptop does not work in the computer, it is likely that the power or charger board within the laptop is bad. It is recommended that the laptop be serviced or repaired.
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