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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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Vizio TV that won't turn on gets 5v standby power but 19v for all the pins that are supposed to be 12v.
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Motherboard no power,19v ok 1st pchannel fet not fuction, PQ35 TPCA8109 p-channel mosefet sorse and gate 19v coming drain suply not coming,pls give me solution.
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
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Dec 24, 2015 • Computers & Internet
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ASUS adapter for 501J series has a short in the cord. Am in need for a Model # ADP-65JH Input 100-240V Output 19V - 3.24A. What do I need to order. E-mail: [email protected]
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.
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Mar 11, 2011 • ASUS Televison & Video
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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...
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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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Sep 10, 2010 • Computers & Internet
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I have a Toshiba Satellite laptop. The original adapter is 100V, 1.l3A input and 19V, 3.95A (DC). Can I use an adapter with 100-240, 1.1A input and 19V 3.42A output?
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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Jun 19, 2010 • Toshiba 200W SERVER POWER SUPPLY...
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Dear friend,
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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.
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Jan 30, 2010 • Computers & Internet
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Unusual Power Requirement
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
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Apr 18, 2009 • Computers & Internet
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Battery not charging
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
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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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