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G75 Motherboard 12V source

Guido7142
Level 7

‎04-21-2013 11:59 AM - last edited on ‎03-06-2024 09:00 PM by Community Admin

Hi, I am planning a little project for my G75 and would like to know if any of you knows a 12V source from the motherboard of the notebook.

Thanks.
G75VW-BBK5 / i7 3610QM / 8GB RAM / OCZ Agility 3 SSD 120GB / GTX 660M
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10 REPLIES 10

ggBanks
Level 10

‎04-21-2013 12:13 PM

I don't know about the 12 volts, but you can get 19 from the power plug, or 5 from any USB.
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Guido7142
Level 7

‎04-21-2013 12:20 PM

I am looking for a 12V or more source that can deliver even when power plug is disconnected.
G75VW-BBK5 / i7 3610QM / 8GB RAM / OCZ Agility 3 SSD 120GB / GTX 660M
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ManOfBusiness
Level 9
In response to Guido7142

‎04-21-2013 07:10 PM

Pull it straight from the battery pack fins @14.4v and use resistors to get your 12 volts, most reliable source.
I use to say ASUS like AZEUS because I thought their products were the Gods of electronics...
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Guido7142
Level 7

‎04-21-2013 07:42 PM

I thought so but, could I cause any overload damage on the board or the battery ? I just want add some things that will consume 2W maximum.
G75VW-BBK5 / i7 3610QM / 8GB RAM / OCZ Agility 3 SSD 120GB / GTX 660M
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ggBanks
Level 10

‎04-21-2013 11:39 PM

No. The worst thing that will happen is that the battery will drain faster, but you cannot overload the system with just 2W.
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Guido7142
Level 7

‎04-22-2013 06:20 AM

Now it occurrs to me that if I hook up something to the battery fins, as you suggest, when I turn off the PC that thing would still be running right ?
G75VW-BBK5 / i7 3610QM / 8GB RAM / OCZ Agility 3 SSD 120GB / GTX 660M
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Guido7142
Level 7

‎06-02-2013 01:03 PM

Does anyone know how the battery pins must be connected to get the power from it ? I hear you need to short two pins to get the negative and some other things too. I will be doing all the work over the pins in the motherboard and not on the battery so anyone has any safety suggestions ?
G75VW-BBK5 / i7 3610QM / 8GB RAM / OCZ Agility 3 SSD 120GB / GTX 660M
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ggBanks
Level 10

‎06-02-2013 11:19 PM

There are a lot of fins on the board, and I don't know which ones you should use, but you could use a 12V voltage regulator that will bring your voltage to exactly 12V. It will work better than with resistors.

About the battery, I don't know if its the same with all laptop batteries, but I found somewhat of an explanation:
21085

I think you should use just the 2 most outside fins to get the 14.4V
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Guido7142
Level 7

‎06-03-2013 12:51 PM

I tried but the thing is that the battery has a circuit inside that decides whether it sends power or not, that is why it has so many pins and some of them are data. When I remove the battery to test which pins contain the voltage I get nothing, apparently the battery is not 'ON' and you need to short some other pins to make it start. These pins all have their respective lines in the motherboard, those are the ones I will be using once I detect the voltage pins.
G75VW-BBK5 / i7 3610QM / 8GB RAM / OCZ Agility 3 SSD 120GB / GTX 660M
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