How to test for faulty Max756?

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rob_in_canada
 
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How to test for faulty Max756?

Post by rob_in_canada »

I recently completed a mintyboost kit (1.2) and had it working fine - USB gave 5V, charged my son's Ipod. When I put it in an Altoid's tin, it stopped charging. The USB was only delivering 2.9 V. Even removing the PCB from the tin didn't help. I suspect that the tin shorted some components on the board and may have damaged the MAX756 chip.

My question: how can I test this hypothesis? With a breadboard, perhaps? These chips seem to be somewhat difficult to locate so I wanted to make sure that I was correcting the real problem.

Note: I've re-soldered all of the points on the PCB but no luck.

adafruit
 
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Post by adafruit »

well there's not really any other part of the mintyboost that can get damaged so its probably the chip :(

rob_in_canada
 
Posts: 4
Joined: Tue Sep 04, 2007 12:40 pm

Post by rob_in_canada »

ladyada wrote:well there's not really any other part of the mintyboost that can get damaged so its probably the chip :(
Drat! Is there a better supplier than maxim-ic? They want to charge $50 for international shipping (to me in Canada). That's just a tad steep for a $3.02 part.

adafruit
 
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Post by adafruit »

digikey doesnt have it? also you can check octopart.com

rob_in_canada
 
Posts: 4
Joined: Tue Sep 04, 2007 12:40 pm

Post by rob_in_canada »

ladyada wrote:digikey doesnt have it? also you can check octopart.com
I managed something through digikey. Thanks!

rob_in_canada
 
Posts: 4
Joined: Tue Sep 04, 2007 12:40 pm

Post by rob_in_canada »

Just a follow-up. I bought 3 Max756+ chips from Digi-Key. They even have the option of charging Canadian dollars and using Purolator (a Canadian courier service). It came to about $32 in the end.

Of course, the MintyBoost now works flawlessly.

adafruit
 
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Joined: Thu Apr 06, 2006 4:21 pm

Post by adafruit »

sucks :(

but now you can build 2 more :)

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