EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: justin66 on March 12, 2016, 08:41:21 pm
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Hey guys i cant figure out how do i hack my power supply to output more voltage. Can anybody please help me with this?
Please dont tell me about safety precautions trust me i know all the dangers capacitors fire hasard etc and i still need help. Thanks
Now i think i need to disable overvoltage and overcurrent protections first and than mess with pwm. I would like to learn new things going along.
Here is some images
(http://s12.postimg.org/gvz8uyt8p/IMG_20160312_222121.jpg) (http://postimg.org/image/gvz8uyt8p/)
(http://s12.postimg.org/6ogpik70p/IMG_20160312_222146.jpg) (http://postimg.org/image/6ogpik70p/)
(http://s12.postimg.org/9eq1fr3pl/IMG_20160312_223751.jpg) (http://postimg.org/image/9eq1fr3pl/)
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please
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where the chip directly senses the output voltage, install voltage dividers.
how much more voltage do you need?
datasheet:
http://www.sg.com.tw/semigp/data/6105/6105-datasheet.pdf (http://www.sg.com.tw/semigp/data/6105/6105-datasheet.pdf)
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I need at least 14v 15v would be ideal
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You need to start checking capacitor voltage ratings, I wouldn't be surprised to see some 16V rated ones. Also on the other rails that will rise at the same time.
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Just trace out the feedback voltage divider. Look at what all the output rails connect to in the PCB. When you find one that goes in to a tiny resistor that seams to go towards the control chip and has a resistor to ground somewhere that is the feedback. Sometimes there might be a wire going to the ATX motherboard plug to sense the voltage there.
Then you just have to change the values of the resistor in there to change the voltage. Going too high with the voltage can make the PSU switch off as a safety feature, so if that happens then you also need to find the divider for that and disable it.
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where the chip directly senses the output voltage, install voltage dividers.
how much more voltage do you need?
datasheet:
http://www.sg.com.tw/semigp/data/6105/6105-datasheet.pdf (http://www.sg.com.tw/semigp/data/6105/6105-datasheet.pdf)
i noticed that its not direct it had a high value resistor and it was dropping the voltage by 0.4v and installing resistor divider didnt change output voltage unfortunately
ps thanks for the datasheet. but maybe im not skilled enough to find an other solution?
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Just trace out the feedback voltage divider. Look at what all the output rails connect to in the PCB. When you find one that goes in to a tiny resistor that seams to go towards the control chip and has a resistor to ground somewhere that is the feedback. Sometimes there might be a wire going to the ATX motherboard plug to sense the voltage there.
Then you just have to change the values of the resistor in there to change the voltage. Going too high with the voltage can make the PSU switch off as a safety feature, so if that happens then you also need to find the divider for that and disable it.
thanks for the suggestion i found it and its brown wire but still cant seem to do this it looks like it has a reference for 5v and 3v rail but no 12v rail is it dependent on 5v rail? i would guess its not but at the same time how does it sense the voltage than. maybe it sense the voltage before the big ferite coil with a multiple whines???? im lost please help me