[SI-LIST] Re: How to check power bank short
- From: "Mike Finczak" <mike@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sun, 7 Jun 2009 13:58:09 -0400
Jolyn,
Using a low ohm multi-meter or measuring the voltage drop may
not work in some cases, especially if it's a dead short.
For this situation, attach a variable power supply across the
planes capable of 20 to 30 amps. Preset the power supply voltage
to same value as the nominal plane voltage, then slowly crank up
the current. Look for hot spots and smoke.
This method can also be used to blow open internal shorts in
multilayer circuit packs, avoiding the junk bin.
Regards,
Mike Finczak
CopperCAD Design
www.CopperCAD.com
905-488-8958
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of cmos@xxxxxxxxxxxxxx
Sent: Sunday, June 07, 2009 11:27 AM
To: Jolyn L
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: How to check power bank short
Jolyn
Try applying a controlled current to the board
and measure the IR drop across each cap and at
different spots on the board.
The voltage will be highest near the supply,
and drop as you approach the short.
If you go past the short the drop will
not go any lower.
I have used this for finding shorts in PC boards.
Happy hunting.
Sandy
CMOS Solutions
> Hi,
>
>
>
> When the test board power plane is shorted to GND, we usually take out
> decoupling cap, either one by one or desolder all.
>
> Since all the decoupling caps are connected in parallel from power
plane
> to GND, it is hard to check among the hundreds of decap, which one is
> faulty.
>
> Anybody has any quick solution to check which decap is faulty other
than
> desoldering all decap?
>
>
>
> Please advice.
>
> Thanks.
>
> _________________________________________________________________
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