Either we have a new pope - or my buck converter is faulty?

Discussion about the MiniTiouner board and the MiniTiouner Digital ATV Receive Software. See also http://www.vivadatv.org/index.php
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Keith G8VMP
Posts: 19
Joined: Mon Jul 25, 2011 11:23 am

Either we have a new pope - or my buck converter is faulty?

Post by Keith G8VMP » Fri Apr 05, 2019 6:27 pm

White smoke....

I've just completed the hardware build and started testing voltages.
The lowest voltage I can get form the buck DC-DC converter is 4.07v and there is 16v on the input.
I cannot physically turn the pot lower its at the end of its travel.

I expected 4.07v to be ok and put a jumper on J2

Very shortly there was smoke coming from the zener diode and I checked the voltage - 6.1v not good!

I assume this is a buck converter problem? or anything else it could be? Input voltage?
If so, where is the best place to get a reliable DC-Dc converter. This one was £1.96 from ebay

Will anything else be dead now?

Many thanks for any advice
Keith

Keith G8VMP
Posts: 19
Joined: Mon Jul 25, 2011 11:23 am

Re: Either we have a new pope - or my buck converter is faulty?

Post by Keith G8VMP » Fri Apr 05, 2019 7:16 pm

I think zener is dead too - just tested 4ohms in each direction.
Hopefully it shorted all the voltage out so the regulators are ok.

2W0ODS
Posts: 51
Joined: Sun Oct 21, 2018 5:15 pm

Re: Either we have a new pope - or my buck converter is faulty?

Post by 2W0ODS » Mon Apr 08, 2019 5:57 pm

There seems to be a few posts of issues with these DC-DC boards, I need to buy one for my kit but I cannot find a known good seller for this particular board or a known good version.

It might be worth putting the info on here where yours was obtained.

Good luck with the build and hope it's just the zener!

Keith G8VMP
Posts: 19
Joined: Mon Jul 25, 2011 11:23 am

Re: Either we have a new pope - or my buck converter is faulty?

Post by Keith G8VMP » Mon Apr 08, 2019 8:08 pm

I got the first one that blew from ebay seller alltopnotch
Second one will be from ebay seller booskibits (although i think someone already had a failure from them)

I'll report back when it arrives.

It was just the zener that blew fortunately.

Keith G8VMP
Posts: 19
Joined: Mon Jul 25, 2011 11:23 am

Re: Either we have a new pope - or my buck converter is faulty?

Post by Keith G8VMP » Wed Apr 10, 2019 5:03 pm

Well there's a thing!

The one I got today from booskibits worked but alltopnotch failed!
Whereas its the opposite for G8DPH

Looks like its a matter of luck then!

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