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ASUS u31sd LAPTOP WILL NOT TURN ON
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Originally posted by opamp View PostOk Its a 1n4148 diode. It needs to be replaced here's a link
http://www.ebay.com/itm/QTY-15-1N414...item3cce4d3f07
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Originally posted by opamp View PostStart checking the mosfet these are numbered 7030AL look at the picture. Put your neg- probe on pin 8 and the pos+ on pin 1. They should have reading one way only.
The other 2 you had circled were not 7030AL, but 5030AL and they read both ways.
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Here's the link for the mosfets. I couldn't find the 5030al but these should work they have the same ratings.
http://www.ebay.com/itm/2pcs-7030L-P...item19d06ce571
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Originally posted by opamp View PostThose are bad too. Check all the them, I mean both sides of the board.
1... 8
2... 7
3... 6
4... 5
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Originally posted by opamp View PostThis is how a mosfet works pins 1,2,3 are the same pins5,6,7,8 are the same. Pin 4 is the gate and supply's voltage to the mosfet so don't touch pin 4 unless you're checking for voltage. When you check the mosfets your DMM is on diode, right?
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Originally posted by opamp View PostThis is how a mosfet works pins 1,2,3 are the same pins5,6,7,8 are the same. Pin 4 is the gate and supply's voltage to the mosfet so don't touch pin 4 unless you're checking for voltage. When you check the mosfets your DMM is on diode, right?
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Yes pin1,2,3 are connected together and pins 5,6,7,8, are connected together only pin 4 is not because that's the gate . If the're voltage in pin 4 mosfet is on if no voltage the mosfet if off. Just image pins 1,2,3 are the pin on side of the diode and pins 5,6,7,8 are the pin on the otherside of the diode and 4 pin turns it on to allow voltage to pass.
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Originally posted by opamp View PostYes pin1,2,3 are connected together and pins 5,6,7,8, are connected together only pin 4 is not because that's the gate . If the're voltage in pin 4 mosfet is on if no voltage the mosfet if off. Just image pins 1,2,3 are the pin on side of the diode and pins 5,6,7,8 are the pin on the otherside of the diode and 4 pin turns it on to allow voltage to pass.
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Originally posted by opamp View PostMake a list of what's bad so you can order it. What were the readings on the mosfet that you say are bad?
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Re: ASUS u31sd LAPTOP WILL NOT TURN ON
Opamp posted an ebay link where you can buy?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740
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