How much voltage through a power cable

[Kevin Authenthic]

Greetings all and thanks for reading my post based on a DV7 3165DX basically my problem is the testing of voltage because after installing a new motherboard my laptop is no longer turning on and I can not justify if it is the motherboard but I doubt that is the problem that was caused although when i removed the processor it seemed as if the thermal has melted onto some of the processor but before I installed this processor everything was working fine the only reason I bought a new motherboard because I was having graphic problems


Long story short guys my question is how much voltage should the DC IN JACK CABLE SUPPOSE TO HAVE I see that there 5 wires...

2 black cables which I know are ground so read 0 voltage
and I have 2 Yellow cables which read pretty low like 2.5V
and then I have the 2 red cables which ready 19.5 V that look pretty accurate.


I read somewhere the yellow cables powerup fan and hardrives i dont know if this is true but w.e. Anyways my problem lies that everytime I click the power button the laptop doesnt turn on and the fan doesnt even attempt to spin at the very least

 

[Shamar Holtz]

I don't know how much V goes through your cord but I do know a bit about laptops.

laptops suck ass when it comes to self repairs. You should never open up your laptop if it isn't 1 or 2 screws to take off (Like your RAM door and your Hard Drive door). Most laptops once you take them apart they don't operate the same when you "Put it back together", Laptop companies tend to do this on purpose so you can not do self maintenance on your laptop.

 

[i7Baby]

The power brick labelling usually says what input voltage and output voltage(s) apply.

 

[Kevin Authenthic]

The power brick labelling usually says what input voltage and output voltage(s) apply.

I see but what do you mean the power brick? are you talking about the adapter which states 18.5 but I am talking about the part that you plug the charger into that is on the laptop

such as http://www.ebay.com/itm/538085-001-Laptop-DC-Power-Jack-Cable-FOR-HP-PAVILOIN-DV7-2180US-DV7-3080US-/271425676396

 

[Shamar Holtz]

The power brick labelling usually says what input voltage and output voltage(s) apply.

I see but what do you mean the power brick? are you talking about the adapter which states 18.5 but I am talking about the part that you plug the charger into that is on the laptop

such as http://www.ebay.com/itm/538085-001-Laptop-DC-Power-Jack-Cable-FOR-HP-PAVILOIN-DV7-2180US-DV7-3080US-/271425676396

I am pretty sure it would be 18.5 if that is what the AC Adapter says, It wouldn't put any less or any more power into your PC than it says on the adapter. Any less than the 18.5 adn the computer will not function correct or at all and any more than 18.5 and the computer parts will fry, laptops are very sensitive to power

The cord you linked had to have been transferring 18.5v of power or else your PC wouldn't have worked in the first place

 

[leeb2013]

the DC output will be stated on the charger and probably on the bottom of the laptop too. I'm not sure where the 6 black/yellow/red wires are which you mention. Perhaps a photo would help.

 

[Kevin Authenthic]

the DC output will be stated on the charger and probably on the bottom of the laptop too. I'm not sure where the 6 black/yellow/red wires are which you mention. Perhaps a photo would help.

 

[leeb2013]

The red cables are correct if they're the same as what the power supply states. The yellow are likely some kind of detection to tell if its a genuine psu or something.