Alesis M1 Active MK2 repair - Flashing Blue LED FIX

[ncuxcz]

Hi, i have replaced C8. but when i turn it on its start blinking again and after that guard have blown out...do you have any idea what should i do?)

[AaronOwenSmith]

@ncuxcz cheak solder, use a multi meter,

[lacedboxa]

Thanks for the video worked perfectly. Although is it normal for the speakers to stay hot even when the power is off? Did I do something wrong? Thanks

[FormulaZR1]

My right speaker started to flash a few months ago so I ordered the caps. I was able to get the speaker to come on by turning it off and and then on when the LED went out so when it powered up correctly I just left it on, until today when the painters were painting my room and I had to turn them off. Set everything back up and the speaker would just flash.

Swapped out the cap and it powers up perfectly.

[cluckfuster]

A MOSFET can also blow when it goes overvoltage slightly. This usually happens silently and without any external signs that it's done so. Alternatively an open circuit MOSFET on a switched mode PSU, is usually so because it's popped like a little mortar. There'll be a nice crack down the middle where it's let all the blue smoke out.

To fix it you'll have to find the blue smoke and try and force it back in or alternatively buy a new one.

[cluckfuster]

This may sound stupid but have you checked for any solder tracking between the pads on the side where the capacitor is soldered? Because the capacitor is directly across the power supply rail, any shorts like that will blow the fuse. Otherwise a general short elsewhere on the board wouldn't have caused the flashing led problem in the first place and probably wouldn't have caused the cap to blow unless it was a sudden discharge caused by one of the MOSFETs in the PSU going low resistance.

[wediotban]

Hey Aaron, i have changed one the black capacitor because it was a bit swallowed but still keep blowing the fuse any idea..thanks

[AaronOwenSmith]

I updated the info on this video, read for more..

[cluckfuster]

Being the other voice and the hands doing the soldering in the video. I bought mine from ebay...

Ebay item 180704682715 @ £1.85. Capacitors as a rule don't have recognisable part numbers as such. Go for 220uF 50v 105C and you're fine!

I bought a batch of five but only 2 of them were needed. So the others are spare in case it happens again.

I've only given the link for C8 as the C35 replacement although recommended wasn't actually needed. I took one off and tested it only to find it was fine.

[spector969]

Great vid guys, thumbs up! but would it be possible to let us know exactly where in the UK you can get the replacement C8, maybe you could also supply a part number or some way for us n00bs to get the same part as you used, thanks

[padperson]

Nice work guys. A job well done.

[DjDumpty562]

Hello Aaron, I have a question.. I am having the same problem, so i need to replace the capacitor also. My question is, does the capacitor have to be polarized or non-polarized?

[AaronOwenSmith]

@DjDumpty562 yes from what i know you can only get polarized in that size anyway, good luck!