FPGA Board not working

Thread Starter

omerysmi

Joined Oct 10, 2014
55
Hi,
I have an fpga board (Altera DE0) which is not working, i found that there is always a short circuit between 3.3V to GND.
When i powered the board with an USB cable the voltage regulators got heat... by the beginning i thought that the voltage regulators casued the problem but after i removed them from the board the short circuit remained.
There is something I can do in your opinion? or it's so complicated to solve it?

This is the schematic document of my board:
https://rti.etf.bg.ac.rs/rti/oo1pot/labvezbe/DE0_Release.pdf

Thanks.
 

bertus

Joined Apr 5, 2008
22,270
Hello,

That is quite a large board.
I would check the 10uF tantalium capacitors.
I have had them create a short quite some times.
Often they are discoulored when shorted.

Bertus
 

Thread Starter

omerysmi

Joined Oct 10, 2014
55
Hello,

That is quite a large board.
I would check the 10uF tantalium capacitors.
I have had them create a short quite some times.
Often they are discoulored when shorted.

Bertus
There is a way to check them without capacitiance meter?
 

bertus

Joined Apr 5, 2008
22,270
Hello,

Is the short only on the 3.3 Volts?
Look in the schematic and on the photo in the manual wich capacitors come in play then.

Bertus
 

Thread Starter

omerysmi

Joined Oct 10, 2014
55
Ok, i found that also 1.2V is shorted to ground, i removed C24,C27,C28,BC35,BC37 from the board and the short circuit is remained..
 

Thread Starter

omerysmi

Joined Oct 10, 2014
55
Hello,

The 1.2 Volt regulator gets its input from the 3.3 Volts regulator:

View attachment 158696

Bertus
Ok but i removed this regulator from the board, so apart from the fpga chip there is no component which use both 1.2v and 3.3v...
What i'm trying to say is that if there is a problem in C14, C15, BC26 through BC33, it should affect only on 1.2V...
 
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