Advanced electronics question.

Hi guys,
Weird stuff is going on with my laptop. Actually, it came from repairing a day ago, because it wouldn't turn on at all. The repairing guy said it was working fine, and that he was testing it for ten hours the day before.
I was using it for about half an hour today and it went off again. But this time, weird stuff, it does work when I disconnect it from the wall. So: the PC is working fine, but only when with batteries. If while working with batteries, I plug it in, it goes of right away. Even more strange: The charger is able to load the battery (I can see the charging light on when the PC is off), its just that it cannot make the PC work. Does this make any sense for anyone with advanced electronics knowledge?
Thanks.

 

You need to try another power adaptor to see if yours is faulty, if it`s not that it`might be that the motherboard power/charging circuit it damaged.

 

I'd buy a $10 cheapo from eBay to test with.

 

The power adaptor is working fine, and this is happening after some repairing time after a tea splash incident, so I´m pretty sure it's a motherboard issue, which cannot get power from the adaptor.
Now, do you think it would be possible to make an adaptor to feed the laptop directly from the battery plug (given that the regular inlet is not working but the battery seems to work normal)?
Thanks.

 

Well it depends on the exact nature of the problem. There is circuitry that senses whether you have an adapter plugged in with power on, if so the power switches from the battery to the adapter. If it is just the plug you could possibly cut the plug off the end and hard solder the cable to the connector pins, but if it’s the switching that is not working, you are not going to repair the problem with the above approach.

Edit: If the above is unable to fix the problem, you will need a new motherboard to repair or someone that knows how to do component level repair.

 

Just replace the power assembly and/or motherboard. If it's feasible, it's going to be a ridiculous hack to work around the safety cutoffs and the battery data that needs to be transmitted.

 

It a capacitor problem maybe from the liquid tea.

Not worth fixing or trying. Up to 6 hrs to dissemble and it may not work.
My friend who's a Electrical Engineer wasted his time trying to fix a circuit problem also.

Buy a new laptop, maybe the Lenova T series with tea drainage holes

 

Ha! 6hrs?!

In some notebooks I've taken apart, the motherboard is separate from the power board. I've replaced DC power boards on a good deal of Acer's. Here's an example. It plugs onto the motherboard, is modular, and is often times pretty cheap. Replacing it, if your notebook has one, can be as simple as taking the bottom plate off. What kind and model notebook is it?