Anker 71an7105 Usb power adapter - blown fuses

**clearchris** · 04-20-2015, 05:20 PM

These are great little power supplies, except that are known for blowing fuses. The newer model has resettable fuses, so after 3 blown fuses, it was time...

Original with fuses:
IMG_20150420_131116.jpg

After adding resettable fuses:
IMG_20150420_180202.jpg

Not the prettiest, but considering the size of the new fuses vs the old ones, not too bad really. Each port is rated for up to 2.5a, I chose a 1.6a resettable fuse that throws at about 3a.

**ben7** · 04-21-2015, 07:07 AM

Nice fix!

By the way, what brand caps are in the PSU? Could we maybe get a pic of the topside of the board?

-Ben

**clearchris** · 04-21-2015, 09:36 PM

You got it.

Top, bottom.and close ups of caps.

IMG_20150421_213122.jpg

IMG_20150421_213446.jpg

IMG_20150421_213218.jpg

IMG_20150421_213138.jpg

**stj** · 04-21-2015, 10:15 PM

you need to resolder the bridge rectifier & power inlet.

**ben7** · 04-22-2015, 04:50 AM

Wow, that is better than I expected! They even used polymer caps!

**clearchris** · 04-22-2015, 03:37 PM

sti: Is that because they are a little light on solder or do you see something else?

ben7: Yeah, aside from the fuses, it's not a bad device. I was surprised to see what appears to be polymer caps as well. These came pretty cheap too, on sale for like 15$ or so. They do up to 8A across 5 ports with 2.5a max from any 2 ports at a time.

**kc8adu** · 04-22-2015, 06:50 PM

nice ring cracks.

**stj** · 04-22-2015, 08:36 PM

Quote:

Originally Posted by kc8adu

nice ring cracks.

exactly, the solder is cracked.

**clearchris** · 04-23-2015, 08:54 PM

Hmm, thanks for the heads up. I took a closer look and couldnt tell if they were cracks or some kind of residue . There were certainly rings of some sort. I removed the lead free solder and used some 63/37 instead. Nice and shiny now.

**clearchris** · 07-23-2015, 05:59 AM

Newer version of the power adapter.

This version seems constructed for easy replacement of fuses, the board has more room for the fuses (still not resetable) and the board has slots underneath the fuses so its a lot harder to solder it in wrong. The solder on the board is a different alloy, it requires a LOT more heat to melt.

IMG_20150721_182117.jpg

IMG_20150721_182129.jpg

Resetable fuses soldered in:
IMG_20150722_113725.jpg

**ben7** · 07-23-2015, 06:04 AM

Nice! Now they should use a synchronous rectifier on the output :P

airsky98 · 09-12-2015, 06:32 AM

Quote:

Originally Posted by clearchris

These are great little power supplies, except that are known for blowing fuses. The newer model has resettable fuses, so after 3 blown fuses, it was time...

Original with fuses:
Attachment 110290

After adding resettable fuses:
Attachment 110291

Not the prettiest, but considering the size of the new fuses vs the old ones, not too bad really. Each port is rated for up to 2.5a, I chose a 1.6a resettable fuse that throws at about 3a.

what part number should i buy for the resettable fuse ? i have one lying around, got it from HK last year, too troublesome to get it fix.

**clearchris** · 02-21-2020, 03:59 PM

Sorry, didn't see the reply. Probably late, but here's what I bought.

Digikey:
652-MF-NSMF150-2
MFG Part No:MF-NSMF150-2
MF-NSMF150-2
Bourns Resettable Fuses - PPTC
US HTS:8533290000 ECCN:EAR99 COO:CN

04-20-2015, 05:20 PM	#1
clearchris Badcaps Veteran Join Date: Dec 2013 City & State: San Antonio My Country: United States Line Voltage: 120v 60hz / 240v 60hz I'm a: Hardcore Geek Posts: 399	Anker 71an7105 Usb power adapter - blown fuses These are great little power supplies, except that are known for blowing fuses. The newer model has resettable fuses, so after 3 blown fuses, it was time... Original with fuses: IMG_20150420_131116.jpg After adding resettable fuses: IMG_20150420_180202.jpg Not the prettiest, but considering the size of the new fuses vs the old ones, not too bad really. Each port is rated for up to 2.5a, I chose a 1.6a resettable fuse that throws at about 3a.

04-21-2015, 07:07 AM	#2
ben7 Capaholic Join Date: Jan 2011 City & State: Trenton, NJ My Country: USA Line Voltage: 240/120V 60Hz I'm a: Hardcore Geek Posts: 3,982	Re: Anker 71an7105 Usb power adapter - blown fuses Nice fix! By the way, what brand caps are in the PSU? Could we maybe get a pic of the topside of the board? -Ben __________________ Muh-soggy-knee

04-21-2015, 09:36 PM	#3
clearchris Badcaps Veteran Join Date: Dec 2013 City & State: San Antonio My Country: United States Line Voltage: 120v 60hz / 240v 60hz I'm a: Hardcore Geek Posts: 399	Re: Anker 71an7105 Usb power adapter - blown fuses You got it. Top, bottom.and close ups of caps. IMG_20150421_213122.jpg IMG_20150421_213446.jpg IMG_20150421_213218.jpg IMG_20150421_213138.jpg

04-21-2015, 10:15 PM	#4
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 22,428	Re: Anker 71an7105 Usb power adapter - blown fuses you need to resolder the bridge rectifier & power inlet.

04-22-2015, 04:50 AM	#5
ben7 Capaholic Join Date: Jan 2011 City & State: Trenton, NJ My Country: USA Line Voltage: 240/120V 60Hz I'm a: Hardcore Geek Posts: 3,982	Re: Anker 71an7105 Usb power adapter - blown fuses Wow, that is better than I expected! They even used polymer caps!

04-22-2015, 03:37 PM	#6
clearchris Badcaps Veteran Join Date: Dec 2013 City & State: San Antonio My Country: United States Line Voltage: 120v 60hz / 240v 60hz I'm a: Hardcore Geek Posts: 399	Re: Anker 71an7105 Usb power adapter - blown fuses sti: Is that because they are a little light on solder or do you see something else? ben7: Yeah, aside from the fuses, it's not a bad device. I was surprised to see what appears to be polymer caps as well. These came pretty cheap too, on sale for like 15$ or so. They do up to 8A across 5 ports with 2.5a max from any 2 ports at a time.

04-22-2015, 06:50 PM	#7
kc8adu Super Moderator Join Date: Nov 2003 City & State: dayton ohio My Country: U.S.A! Line Voltage: 12vdc,120/240vac,480vac 3ph on my bench I'm a: Professional Tech Posts: 8,296	Re: Anker 71an7105 Usb power adapter - blown fuses nice ring cracks.

04-23-2015, 08:54 PM	#9
clearchris Badcaps Veteran Join Date: Dec 2013 City & State: San Antonio My Country: United States Line Voltage: 120v 60hz / 240v 60hz I'm a: Hardcore Geek Posts: 399	Re: Anker 71an7105 Usb power adapter - blown fuses Hmm, thanks for the heads up. I took a closer look and couldnt tell if they were cracks or some kind of residue . There were certainly rings of some sort. I removed the lead free solder and used some 63/37 instead. Nice and shiny now.

07-23-2015, 05:59 AM	#10
clearchris Badcaps Veteran Join Date: Dec 2013 City & State: San Antonio My Country: United States Line Voltage: 120v 60hz / 240v 60hz I'm a: Hardcore Geek Posts: 399	Re: Anker 71an7105 Usb power adapter - blown fuses Newer version of the power adapter. This version seems constructed for easy replacement of fuses, the board has more room for the fuses (still not resetable) and the board has slots underneath the fuses so its a lot harder to solder it in wrong. The solder on the board is a different alloy, it requires a LOT more heat to melt. IMG_20150721_182117.jpg IMG_20150721_182129.jpg Resetable fuses soldered in: IMG_20150722_113725.jpg

07-23-2015, 06:04 AM	#11
ben7 Capaholic Join Date: Jan 2011 City & State: Trenton, NJ My Country: USA Line Voltage: 240/120V 60Hz I'm a: Hardcore Geek Posts: 3,982	Re: Anker 71an7105 Usb power adapter - blown fuses Nice! Now they should use a synchronous rectifier on the output :P

02-21-2020, 03:59 PM	#13
clearchris Badcaps Veteran Join Date: Dec 2013 City & State: San Antonio My Country: United States Line Voltage: 120v 60hz / 240v 60hz I'm a: Hardcore Geek Posts: 399	Re: Anker 71an7105 Usb power adapter - blown fuses Sorry, didn't see the reply. Probably late, but here's what I bought. Digikey: 652-MF-NSMF150-2 MFG Part No:MF-NSMF150-2 MF-NSMF150-2 Bourns Resettable Fuses - PPTC US HTS:8533290000 ECCN:EAR99 COO:CN

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