A1 Dead :(

ok finally got around to testing the PSU while connected to to the A1 all powers are fine but the pin 9 SB only reading 3volts should be 5volts could this be whats stopping my A1 booting ?

@poweramiga

Nah, mate, 3V is enough there, I think.

If you bring it to the Club meeting next week, I could have a butcher's at it.

@poweramiga

You have my deepest sympathy. I hope you get it sorted, mate.

@poweramiga

Does anything happen? Do disks spin up, fans, any output on the monitor/serial, anything?

I think it could be the 5VSB. What does the 5VSB read when powered off but plugged in? It should still be 5V and the network light should be blinking if a cable is plugged in. (Does the A1 have network lights?)

If the power button works at all you could try bridging the 5VSB to 5V with a diod. That way the 5V would help lift the 5VSB up to a decent level if the PSU starts at all that is. The ring marking on the diod towards the 5VSB!

@Deniil

The PSU fires up the fans dvdroms lights flash HD light stays on solid hd spins no display on monitor tried 3 new batteries etc only thing i can see is the low voltage on the pin 9
before it stopped working when turned on would take maybe 10 to 20 attempts to get uboot to show once booted was fine then went away on holidays turned of at wall 2 weeks later came home now nothing at all no uboot :(

@poweramiga

A capacitor may be broken on the 5VSB. Caps typically don't like holidays. If they were bad before, they will break when powered on after a week of power off.

If you have the skills, open the PSU and look for bulged capacitors. If you find any, replace them with something similar, but never lower voltage.

Or try bridging the 5VSB to 5V using a not too weak diod.

@poweramiga

Hope you can bring it back to life.

I haven't been able to do so with mine. Tried a new battery, a new PSU, tested my gfx card in other machine... Next will be to find an old machine to test the memory module.

Good luck to you!

@poweramiga

Any output from the serial port?