No power laptop not powering up. I meaured 19v at the input to the motherboard and 5v at the on switch,but without diagrams i cant get any further. Might there be any components known to be troublesome? (dell inspiron 500m) thanks

There may be faulty electrolytic capacitors on the power board check for them first by looking at the ends for bulging or leaking

19 Volts? Input? Sounds like you're dealing with a laptop motherboard, and perhaps an Acer Aspire. Power comes on now, but battery not charging? Is there a PQ36 power MOSFET connected to the drain of the PQ35? If so suspect it to be bad. Also look in this power circuit area at all of the solid capacitors, for this circuit. Any black/brown/burnt looking? (SMD style. Surface Mount Device. Silvery rectangular shaped solid capacitors, and have a band across their middle) Also; IF you are not testing a power MOSFET correctly it will show bad.

ALSO:
Easier to replace the motherboard yes, but;

A) Where will the next generation of true electronic repairman/woman come from? Already we have nothing but a bunch of 'Parts Changers'. NOT tech's. Replace the motherboard; get a new laptop; get a new computer, etc.

B) That Power MOSFET costs about 97 cents USA.
88 cents for the SMD solid capacitors, probably.
Compare that to a L16.99, or L66.79 motherboard.

I commend you are at least trying; thanks!

Regards,
joecoolvette

You need a mains adapterthat has Input 100-240V Output 19V - 3.24A and the input plug that fits into the power socket of your laptop. It does not need to be from ASUS.

Google search the Internet for a suitable power adapter, make sure the output voltage is the same and the amps is 3.24 or higher.

Connect the adapter to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard.
This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. If you cannot DIY then I suggest you get a quote first.

The input voltage doesn't matter - the 100-240 just means the adaptor will work in most countries.

The output voltage is the same, and the current is only slightly lower - so as long as the plug to the laptop is the same AND has the same polarity [+ and - in the same places on the plug] then yes, you will be able to use it.

Dear friend,
You must have some knowledge atleast about the various kinds of power supplys used in different electronic appliences. Otherwise you can't move further. The power supply generally goes to various ICcs and switching devices in the motherbord for differnt purposes. It varies from manufacturer to manufacturer; model to model and so on. What about your status in electronics? The output voltage of the adapters - and thus which in the motherboards- varies form company to company and model to model. You can veiw it on the adapter as ' OUTPUT:19V, 4.74A' and like this. It will be the reading that you must get with the adapter. If you don't get this voltage -without plugging it in the AC outlet- the adapter is faulty. If you don't get the voltage mentioned in the adapter on the motherboard- if the adapter is good- then it is somthing wrong on the motherboard.Reply if you need further assistance.

Unfortunately, the charger socket in the motherboard does not drive electricity to the battery to get re-charge it. It is a typically motherboard problem(Do not confused with a power jack problem). I can not be repaired it.
Two options work always hook with power adapter or get ride of her.

Should not be a problem, the theory here is Volts * Amps =Watts

5V * 2A = 10w

The alternative is to get a LM7505 ($1 or 2) from radioshack or any electronic supply and regulate the 12v down to 5v. its about 1/2 square IC chip.

Pardon my ASCII:
[_]
input 1.7V - 35V ________| | |_____ +5v (+/- 1%)
Pin 1 Pin 3

will accomodate 1 Amp (1.25 if heat sinked) for the CMOS version, slightly higher for the olde r(less effecient) version

The other pin is ground. OF course you will want to check the specs and pin assignment for the brand you buy, these are typical.

TechieJon

It could be the power cord if without the battery the laptop will not power up with the cord.

However, if it does power on, the power cord is fine and it could be a motherboard problem

CHECK YOURE POWER HOOK UP ON THE BOARD MAKE SURE THEY ARE HOOKED UP ON THE RIGHT ONE IF THEY OR OFF ONE PEG IT WILL NOT POWER UP