Hi Guys and Girls,
I have a seriously annoying fault with one of my customer's laptops.
It first came to me and was dropped off with the fault reported as it wouldn't charge or run without the battery.
The first thing I did was check the voltage of the charger and that was correct, but it was a cheap nasty £6.50 replacement. I couldn't be sure of the current though, so I tried my universal power adapter and that worked, so I told them that they needed a new power lead and that they should get a proper one. They asked me to source a good one and I did.
It arrived, I tested it, it worked, I even stripped the laptop to check the voltage was getting to the board and it was. I tested it again successfully and arranged for the customer to come and collect it. When she was here, as I like to do, I demonstrated it, but it was completely dead, just as it had been, so extremely red faced, I said that it was likely to be the motherboard or the dc jack and that it was worth trying the dc jack first. Luckily on this laptop it is on a wiring harness, so there is no annoying de-soldering to be done.
I ordered the socket, received the wrong one, ordered again and finally got the right one, went ahead and fitted it today and tested the hell out of it with both chargers, plugging and unplugging 20 or so times and it was all perfect. Again I arranged for her to come and collect it only for it to be completely dead when she was here!!
It does the same without the battery. I am sure that it needs a new battery, but it should run off the charger without it. when it was working there was a light at the front to say that it was plugged in, now there is no light at all.
Can this just be the motherboard now?? I can't think of any other component involved in the power circuit, but I am out of pocket around £40 now, so I don't want to rush in to getting a new motherboard in case it still doesn't work.
I should tell you, I am a very good computer engineer and I started my IT business in 1994, so I am able to do pretty much anything that any of your geniuses can think of.
To say that I was completely humiliated is an understatement!