Tip & How-To about Computers & Internet

AC adapter connectors

HP, Compaq, Toshiba and some others have problems with their AC adapter connectors on the motherboard. This is because they are not secured to the motherboard very well. They are just soldered to the board by the adapter leads. This puts stress on the leads whenever the plug is bumped or from plugging and unplugging the adapter. The adapter connector will, over time, become loose. The adapter will then not charge the battery, and when the battery becomes weak, the system will not power on. Some times, the unit will power on, but will shut off if the adapter plug is wiggled. If you continue to operate your system in this state, heat will build up from arcing at the ac connector and will burn the motherboard. If not repaired, the system board and CPU could be damaged beyond repair. Replacing the motherboard is then the only option This could cost $350 and up. So the word is GET IT REPAIRED EARLY

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my hp compaq tc4200 wont turn on.if i plug power cable it shows charging after few seconds it wont charge i removed battery but the problem still


Here below are possible causes and troubleshooting steps of laptop that can't power on, hope it may help:
Possible causes:

1. AC adapter failure.
2. Power jack failure.
3. Motherboard failure.

Possible troubleshooting steps and repair solutions:
1. Test your compaq tc4200 power supply with a digital multimeter. It's possible that you have a failed AC adapter. If you don't have a multimeter, test your laptop with another known good AC adapter.

2.It's possible that power jack (socket where you plug the AC adapter) is broken. Remove the motherboard and take a closer look at the power jack. In some cases you can fix the jack by resoldering it on the motherboard. In other cases you have to replace the jack with a new one. Using a multimeter, test if the power goes to the motherboard through the jack.

3. If replacing the AC power adapter and jack on the motherboard doesn't help, most likely you have a bad motherboard. Replace the motherboard.

Jan 08, 2013 | HP Computers & Internet

3 Answers

laptop not charging


Unfortunately on most Compaq/HP mobile devices the AC pin is soldered directly onto the motherboard. If the pin is severely bent of broken off then a service is required, usually to replace the motherboard. Having the broken off like then can actually create a minor crack in the PCB. Sorry for the bad news.

Nov 17, 2007 | Compaq Evo N610C Notebook

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