How do you correctly use a Lab Power Supply?

[orientalsniper]

I apologize for crossposting, since I'm not getting much response from this thread.

I bought this HY3010D power supply and I haven't had much success finding shorts in motherboards (laptops mainly). I solder negative to any ground in the motherboard and solder the positive in mosfet, capacitor, inductor, etc.

Most of the time only V is lit up, A is 0.00 (CC light is ON and CV light is OFF).

Out of 10, only 1 motherboard had the faulted component heat up. Would appreciate any technique you guys use, thank you.

[3d0]

Re: How do you correctly use a Lab Power Supply?

Apart from this thread here, I cant find much either.

https://www.badcaps.net/forum/showthread.php?t=35231

If you find anything useful post it here please.

[khaahk]

Re: How do you correctly use a Lab Power Supply?

I apologize for crossposting, since I'm not getting much response from this thread.

I bought this HY3010D power supply and I haven't had much success finding shorts in motherboards (laptops mainly). I solder negative to any ground in the motherboard and solder the positive in mosfet, capacitor, inductor, etc.

Most of the time only V is lit up, A is 0.00 (CC light is ON and CV light is OFF).

Out of 10, only 1 motherboard had the faulted component heat up. Would appreciate any technique you guys use, thank you.

How do you know that short exists? If you apply voltage across very low resistance then the result must be many amps. Either there is no short or you are trying the wrong rail.
I apply low voltage (depending on the rail - 1V is mostly enough) and limit the current to 1A and touch by hand, if nothing heats up then it is time to add more amps. If the short is inside a big IC (northbride or smth), then even 3A might turn it only slightly warm. If you give too much amps at once and the short is inside a small cap, then it might burn up and you might get damaged pcb.
The main point is that you don't need to use high voltage to find shorts.
I attach the negative lead with alligator clip to ground and for positive lead i use either a alligator clip with needle or if more amps are needed then soldering is required. I used rather thick wire (~2mm diam) to solder the alligator clips to, because if you don't then the wires are going to heat up instead.

[orientalsniper]

Re: How do you correctly use a Lab Power Supply?

How do you know that short exists? If you apply voltage across very low resistance then the result must be many amps. Either there is no short or you are trying the wrong rail.
I apply low voltage (depending on the rail - 1V is mostly enough) and limit the current to 1A and touch by hand, if nothing heats up then it is time to add more amps. If the short is inside a big IC (northbride or smth), then even 3A might turn it only slightly warm. If you give too much amps at once and the short is inside a small cap, then it might burn up and you might get damaged pcb.
The main point is that you don't need to use high voltage to find shorts.
I attach the negative lead with alligator clip to ground and for positive lead i use either a alligator clip with needle or if more amps are needed then soldering is required. I used rather thick wire (~2mm diam) to solder the alligator clips to, because if you don't then the wires are going to heat up instead.

Thank you, that's a good point, when the negative wire was getting very hot, it was melting the plastic connector in the PS.

So what you are saying is if I can't increase current, it means I'm on the wrong rail or there's no short?