booting problems

[wpte]

well, I guess it's finally my turn

basicly it boots normally until wireless is about to be initialised
I'm able to restore firmware via tftp.
sometimes it boots up real slow, and the restoration mode seems to kick in after 5 minutes or so.

I have no other adapter capable of 2.5A
I guess it's probably the adapter tho, but how do I open it
any advice?

update... only the lan and wan leds burn at normal strength now, nothing happens

[al37919]

update... only the lan and wan leds burn at normal strength now, nothing happens

typical symptom of faulty PSU: _all_ lan and wan leds are burning

to open it is easy: it is just glued. So, you'll need a knife to carefully break it along the glueing line.

it can also be an electrolyte capacitor on the main board, however, failure of PSU is more likely.

Then you know what to do
http://pic.ipicture.ru/uploads/090413/y3EaVJRS1h.jpg

[wpte]

typical symptom of faulty PSU: _all_ lan and wan leds are burning

to open it is easy: it is just glued. So, you'll need a knife to carefully break it along the glueing line.

it can also be an electrolyte capacitor on the main board, however, failure of PSU is more likely.

Then you know what to do
http://pic.ipicture.ru/uploads/090413/y3EaVJRS1h.jpg

thanks al37919,
I just tried it with a 5W psu, and the power led starts burning along with the connected lan port led
but it's not enough juice jet
the old psu seems to give me only 2W

I tried to open it up by cracking it open, but I can't seem to get grip on it, I'll try it with a knive, or just go and buy a better psu

[wpte]

I've found a psu, but it'll cost me 50 euro, so that's a no go

Same issue here. 10v 1200uF capacitor corrupted in the power supply. Changed with a 25v 1200uF capacitor (20 cents). Also I made some little holes in the box before closing with glue.

Works!

Paolo

I'm not really a electronic wiz, but 25V 2200uF will work as well?
10v 1200uF
25V 2200uF

edit: fit's better I guess: http://www.conrad.nl/goto.php?artikel=421934


it's popped

[al37919]

I'm not really a electronic wiz, but 25V 2200uF will work as well?
10v 1200uF is like 12W
25V 2200uF is 55W

so I guess it's take anything that can handle more than 12,5W?

I'm also familiar with electronics more from practical side than from theory, but your relationship between voltage rating, capacity, and power I think deserves a Nobel prize

Everything is more simple: it is 5V device, therefore you need capacitor rated by 10V or higher. It is output capacitor, therefore the higher capacity the better. Plus, it should have size which will be able to fit in this case This is main limit of capacity in your situation.

Some people recommend to add 100nF ceramic capacitor in parallel to it.

I think the one you've pointed out should be ok.

[wpte]

I'm also familiar with electronics more from practical side than from theory, but your relationship between voltage rating, capacity, and power I think deserves a Nobel prize

Everything is more simple: it is 5V device, therefore you need capacitor rated by 10V or higher. It is output capacitor, therefore the higher capacity the better. Plus, it should have size which will be able to fit in this case This is main limit of capacity in your situation.

Some people recommend to add 100nF ceramic capacitor in parallel to it.

I think the one you've pointed out should be ok.

hehe
yes, it has been a while I had something about this on school, but you're right there is no relation ship between those factors

anyway, the one I've pointed out is not really fitting since the inside of the casing is 25mm, and the the capacitor is 25mm tall
so this is a better one I think: http://www.conrad.nl/goto.php?artikel=445981
20mm tall and 12,5mm wide, which should just fit with a bit of force probably, since the heatsink is in the way

the other one http://www.conrad.nl/goto.php?artikel=421919 has the exact same size and specifications

[al37919]

just an observation --- on all three pages you've shown the capacitors on the pictures have 10x smaller capacity than in attached description Strange guys...

[wpte]

just an observation --- on all three pages you've shown the capacitors on the pictures have 10x smaller capacity than in attached description Strange guys...

yeh well, they're not going to photograph everything I guess, only one of the series since they all look alike