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Problems with the PCBs

Started to assemble the first circuit board and run into a problem straight way. It turns out that there is a short circuit between the 5V and GND planes on the board. It’s taken a bit of time to track down where the problem was but managed to locate the issue at the cost of sacrificing a couple of the circuit boards.

The problem was that several vias don’t seem to have any clearance between them and the power planes. Looking at the files in a gerber viewer then it looks like the vias have clearance on the two inner planes as expected.

Gerber view

By shining a light under the board it’s possible to see where the vias have no clearance. The ones highlighted in green are correct and have no issue, the ones in red seem to be shorting out the inner two layers. I have confirmed this by drilling out these vias and confirming that the direct short between them has gone.

Closeup of the PCB

PCBs have arrived

The finished PCBs have arrived and look good. Quality seems good on the build of them.

Next stage now is to build up the ATX power circuit and ensure it’s working before attempting to build more of the computer.

Blank PCB

Blank PCB Logo

Blank PCB Closeup

PCB design completed

The schematic design has been done and after many hours routing tracks I the PCB layout has been completed and ready to be sent off for manufacture.

Ddriag rev 2 PCB

Board Specs

  • layers: 4
  • size: 380mm x 240mm
  • vias: 1615
  • holes: 3438
  • traces: 4627

I’m getting the PCB manufactured with EasyEDA as the board cost was reasonable for a 4 layer board of this size. Once the boards have been delivered will post an update.

Ddriag rev 2 Top View