Amiga 500 is dead

[jhonny82]

Hello guys, today is a bad day for me because my A500 not power on

Today I power it and Amiga goes done, load workbench but without clock (Battery back not found) very strange,, 10 days ago it work all correctly. So, after load WB, i switch power off Amiga for 10 sec. and when I powered ON, Amiga not start, nothing, power led green not work . All off...It seems to be no power.
Maybe power supply failure?? ?? :-( :-( :-( No strange sound i hear, nothing of nothing

[Predseda]

First attempt: remove memory module from trapdoor and try it again. Sometimes this expansion just fails.

[jhonny82]

Originally Posted by Predseda

First attempt: remove memory module from trapdoor and try it again. Sometimes this expansion just fails.

Excuse me Predseda but expansion slot i think not is linked with this because LED GREEN POWER not goes on it seems there is no power inside.

There is no difference when I power button on and off in power supply. NO LED POWER

How can expansion card not goes power On LED amiga?

[Arnie]

There could be a short circuit preventing the Amiga powering up.

[jhonny82]

Originally Posted by Arnie

There could be a short circuit preventing the Amiga powering up.

Maybe but i would first try another power supply ... but no friends here that have power supply.. :-(

[Arnie]

I meant to say that Predseda might think that there may be a short circuit in the mem expansion which is preventing the Amiga from booting. Remove the mem expansion and try again.

[jhonny82]

Originally Posted by Arnie

I meant to say that Predseda might think that there may be a short circuit in the mem expansion which is preventing the Amiga from booting. Remove the mem expansion and try again.

I trying test pin of contacts with a common tester but results is 0V for all pins... it's power supply tha fail?

[Predseda]

Could be. Some PSUs have a fuse inside, check it.

[jhonny82]

Originally Posted by Predseda

Could be. Some PSUs have a fuse inside, check it.

My model is 312-503-03 MADE IN CHINA 5V 2.5A and 12V 1.0A
this model is dangerous to view inside?

[Arnie]

Originally Posted by jhonny82

My model is 312-503-03 MADE IN CHINA 5V 2.5A and 12V 1.0A
this model is dangerous to view inside?

Yes, they can hold a charge for a while. Make sure it has been switched off for some time and unplug it from the mains before you open it.

[ReadOnlyCat]

Originally Posted by Arnie

Yes, they can hold a charge for a while. Make sure it has been switched off for some time and unplug it from the mains before you open it.

Good advice.

Note that if this power supply (PSU) includes a fuse and the fuse is dead that might mean that it has some bigger problems: the fuse likely died for a reason so replace it with the same model of fuse but be ready for it to die again.
These PSUs are quite old now and it is normal for them to fail.

Also, do not short-circuit the fuse with a wire! It is there to prevent damage to the Amiga in case the PSU fails.

[jhonny82]

Originally Posted by ReadOnlyCat

Good advice.

Note that if this power supply (PSU) includes a fuse and the fuse is dead that might mean that it has some bigger problems: the fuse likely died for a reason so replace it with the same model of fuse but be ready for it to die again.
These PSUs are quite old now and it is normal for them to fail.

Also, do not short-circuit the fuse with a wire! It is there to prevent damage to the Amiga in case the PSU fails.

yeah it is a doubt that I have.. fuse don't know if is died or not for now. Another doubt is Maybe switch on/off it's damaged? but i don't know... When it work I switched to OFF and when I switched to ON Amiga has no power (as switched is still OFF) without any kind of noise, clip,nothing!)

[jhonny82]

I have check fuse of power supply and it is ok and switch ON/OFF are ok but there are no power in the secondary but results is 0V for all contacts. It's power supply that died!

[Smakar]

Originally Posted by jhonny82

I have check fuse of power supply and it is ok and switch ON/OFF are ok but there are no power in the secondary but results is 0V for all contacts. It's power supply that died!

My A1200 PSU recently died, and I ended up building a replacement. There are numerous tutorials out there, including this one
http://www.ianstedman.co.uk/Amiga/am..._supplies.html
and http://www.cosam.org/projects/a1200t/psu.html

It turned out not to be that complicated - you may want to give it a go.

[jhonny82]

Finally my amiga working again! I replace power supply with an lightweight PSU with 5V at 4.5A made in china... issue was PSU!

but remain problem of 'battery backup not found' it's strange because battery was changed less of two years ago... battery life is too short?!? or it is wires of battery the issue?

[dlfrsilver]

Most of the time, it's the capacitors which are dying on ya. Once changed for new ones, it's back again for some more !

[jhonny82]

Guys, I have had sucess with "setclock reset" from a shell. Clock now work perfectly! it's a software issue! now my amiga work perfectly @ 100%

[dlfrsilver]

Johnny82 : it can be one of those :

3) P/NO. 312 503-03 (A500/A600/A1200) => http://cosmosunivers.free.fr/PSU/312..._image+kit.jpg

4) P/NO. 312 503-03 rev 1 (A500/A600/A1200) => http://cosmosunivers.free.fr/PSU/312..._image+kit.jpg

5) P/NO. 312 503-03 rev 3 (A500/A600/A1200) => http://cosmosunivers.free.fr/PSU/312..._image+kit.jpg

6) P/NO. 312 503-03 rev 94V (A500/A600/A1200) => http://cosmosunivers.free.fr/PSU/312..._image+kit.jpg

7) P/NO. 312 503-03 rev A500 (A500/A600/A1200) => http://cosmosunivers.free.fr/PSU/312..._image+kit.jpg

Can you open and look ?

[jhonny82]

You says PSU that is dameged (it's heavyweight Made in China with 2.5 A) or you say PSU that i replace?
Old PSU i can open it! (my friend just open it, i can ask him what picture is same)

[dlfrsilver]

yes ask him, and if you can post the photo please