Toshiba 30W Adapter Model : PA3743U-1ACA is failing to power up laptop. Laptop tested ok with an other adapter. 19V is ok at output pins but without load. Steps taken : Main electrolyc cap changed with no avail. Power transistor and output reg Ic measured ok on circuit. Zener diodes tested ok. Board inspected, no burned item. A dry joint cap in output section resoldered Any clue
Oh yes I overlooked that line... Then most likely is an IC on the main electronic board inside the adapter. I suggest you to replace it with a new adapter unless you're an electronics enthusiast.
And what's about the power connector jack which will be plugged into the laptop? Have you checked that those has power ready (test with power meter!) and the the connector delivers the power (if available) to the laptop?!
He talked from an other power adaptor! Also, even if his adaptor delivers power, that didn't means that the connector jack is OK! We had such several times over the years!
Don't know about where you are, but in my neck of the woods you can buy voltage testers for as low as $5US. Get one if you can and check the voltage output directly at the adapter's plug. The sticker on the adapter lists electrical input and output parameters. On some devices the parameters are molded into the plastic enclosure.
You got the right answer from Mr.X, which I thank properly. Indeed I'm talking about the failing adapter. Of course, broken and short cable is the weakness of most adapters, and that's the first thing to check, by a Tech.
I mentioned in my 1st post, I measured 19v at output pins, tested power transistor, output reg IC and zener diodes. It should be obvious that a tool is needed for checking these components, at least a multimeter!!!
I mentioned in my 1st post, I measured 19v at output pins, tested power transistor, output reg IC and zener diodes. It should be obvious that a tool is needed for checking these components, at least a multimeter!!!