The Mother Board

Motherboards.org forums. Free tech support, motherboard ID, and more.
It is currently Mon Oct 21, 2019 5:16 pm




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Tue Feb 26, 2019 12:18 pm 
Offline
Pilgrim
Pilgrim

Joined: Tue Feb 26, 2019 12:10 pm
Posts: 1
Hi everyone. Im looking for some advice, hope someone is willing to help.

Its a short question. Im trying to find a short to ground on a motherboard. I have a dc power supply.
Usually I see people using dc power when theres a short. It drops to something like half the voltage set and 1 to 2 amp draw.

For me on numerous occasions I make contact at say 19v and a 19v rail, voltage drops to zero, I get a spark and almost no voltage at maybe 1 amp.

Without some sort of voltage I can find the short with something getting hot. I never see others using power supplies gettting sparks and voltage doesnt seem to drop to zero for them.

What am I doing wrong?

Please help me on my way


Top
 Profile  
Reply with quote  
PostPosted: Thu Feb 28, 2019 1:32 am 
Offline
Mobo-fu Master
Mobo-fu Master

Joined: Sun May 06, 2001 12:01 am
Posts: 37568
Location: Netherlands
You can safely discard of that motherboard now.
None of the components is capable of handling 19V.

I don't know where you got the story you can use a power supply to check for shorts. Usually you take a multimeter.

_________________
We hate rut, but we fear change.
********************************
System error, strike any user to continue...


Top
 Profile  
Reply with quote  
PostPosted: Thu Feb 28, 2019 10:25 am 
Offline
Black Belt 2nd Degree
Black Belt 2nd Degree

Joined: Mon Aug 09, 2004 7:33 pm
Posts: 2760
Location: Milwaukee - Wisconsin
Don't know why you'd pump so much voltage to find a short... :o

Just need to find continuity to your ground where you don't expect it. You're looking for resistance - so whatever the multimeter's "voltage" is when testing ohms. probably in the 500mV range or lower.

-R

_________________
Lian Li Lancool First Knight Series PC-K59W
Intel Core i7-960 Bloomfield 3.2GHz
EVGA X58 FTW3 132-GT-E768-TR
EVGA GeForce GTX 1070 FTW GAMING ACX 3.0
G.SKILL Ripjaws Series 12GB (3 x 4GB)
Crucial M4 128gb SATAIII SSD x2
Crucial M4 256gb SATAIII SSD
OCZ Saber 1000 960GB Enterprise SSD
Corsair Professional Series HX850 PSU
Dell UltraSharp U2713HM 27" w/drop ceiling mount
Logitech G930 7.1 Headset
DBPOWER RGB LED Keyboard
Logitech G402 Hyperion Fury


Top
 Profile  
Reply with quote  
PostPosted: Fri Mar 01, 2019 12:05 pm 
Offline
Enlightened Master
Enlightened Master

Joined: Fri Jun 14, 2002 1:03 am
Posts: 17184
Location: England
Unless its a laptop motherboard or certain mini/pico/nano itx boards... Look for any damaged components or board traces.

_________________
I have been programming on computers since the ZX81.
I am an apprentice trained Electronics Engineer with qualifications to back it up.
I have been repairing computers since 1996.
Yet to some people I still know nothing...


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 


Who is online

Users browsing this forum: BLEXBot [Bot] and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group