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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

Posted by terry figa on

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Measuring the voltage outputs without applying a load doesn?t eliminate the adaptor as the problem. You also have to know how may amps it can supply as well. To answer you specific question common problems are defective battery, A/C power supply and my favorite?s defective power connector or circuitry inside. When you plug in the A/C power adaptor do any of the LEDs light, up? Does anything happen? Also try removing the battery, plugging in the A/C adaptor and try powering up. If this doesn?t work please supply answers to the above questions plus any other pertinent information you may have. As always please don?t forget to rate the posting but please wait till after we?ve finished.

Posted on Jan 16, 2007

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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.

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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.
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Dear sir do you happen to have circuit diagram for acer aspire 5570 , the 19v dc power in connection pin broke in two. i need the schematic diagram for this power system board which lead to the...

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.
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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.
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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.
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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.

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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
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