Power line fault

May 03, 2011, 07:39:32 AM

#0

sniperchild

sniperchild

Show sniperchild's last posts.

Show general stats for sniperchild.

Hero
Posts: 3

Power line fault

I have a GE-SBC 9260 which has developed a power line fault. Connection at the power jumpers was intermittent and now the board fails to start.

Could anyone identify points on the same net as the +5V pin and GND so that I may test continuity and/or supply power through different contacts?

A swift reply would be greatly appreciated

May 03, 2011, 08:17:22 AM

#1

admin

admin

Show admin's last posts.

Show general stats for admin.

Administrator
Super Hero
Posts: 342

Re: Power line fault

Attached is the picture of the voltage regulator chips. The pin 3 as indicated by the arrows is the 5V input. The big tab is connected to the output, they should be 3.3V and 1.8V.

VoltageRegulator.jpg (59.72 KB, 609x344 - viewed 65 times.)

May 03, 2011, 08:27:34 AM

#2

sniperchild

sniperchild

Show sniperchild's last posts.

Show general stats for sniperchild.

Hero
Posts: 3

Re: Power line fault

Thankyou for the picture and fast reply

I appear not to have continuity from either jumper pin to any pins on either regulator - i do have continuity from the negative side of the protection diode to GND on the regulators.

Any suggestions on what my fault may be? broken track, bad joints on the jumper? Could a component failure cause this?

Where do I stand on supplying power directly to the input of one regulator, should that get the board up again?

May 03, 2011, 10:05:07 AM

#3

admin

admin

Show admin's last posts.

Show general stats for admin.

Administrator
Super Hero
Posts: 342

Re: Power line fault

The 5V conenction from the J1 is solid copper plane. It is unlikely the copper plane would cause the intermittent connection problem. Please check the J1 soldering and mating of your power supply to J1.

May 09, 2011, 07:24:57 PM

#4

sniperchild

sniperchild

Show sniperchild's last posts.

Show general stats for sniperchild.

Hero
Posts: 3

Re: Power line fault

I have thoroughly checked the connections, and the only conductivity I have is to the cap across the jumpers on the board topside.

I am facing a time pressure and need to get a board running in the next couple of days, I have probed around and ascertained that the USB sockets each are raw connected to the 5V and GND rails. My intention is to introduce power to the board the wrong way down a USB cable.

Can you confirm if that will work or am I going to let the magical black smoke out?

Is there a better place to jump the 5V in?

« Last Edit: May 09, 2011, 07:57:27 PM by sniperchild »

May 10, 2011, 07:41:30 AM

#5

admin

admin

Show admin's last posts.

Show general stats for admin.

Administrator
Super Hero
Posts: 342

Re: Power line fault

The GESBC-9260 is not degined to be powered from USB port. Connect the 5V from USB port will not damage the board but proper operation is not guaranteed.

The 5V should be connected to J1. As indicated in the picture the 5V should be present on pin 1 of both linear regulators.