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boost converter test failed
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boost converter test failed

by smallgene on Wed Jul 02, 2014 10:21 pm

I get the beep when it is plugged in. However, when I test the voltage, it only comes out to 8.7 V.
For you convenience, I have attached a picture of the board and the soldering on the back.
Please let me know if there's something amiss.

Thanks for your assistance!

IMAG0505.jpg
IMAG0505.jpg (845.33 KiB) Viewed 924 times
Attachments
IMAG0504.jpg
IMAG0504.jpg (740.85 KiB) Viewed 924 times
smallgene
 
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Re: boost converter test failed

by jarchie on Thu Jul 03, 2014 7:43 pm

What is the value of R5? It looks as if you've installed the 10k resistor as R3, which could indicate that the resistors for R5 and R3 were reversed.

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Re: boost converter test failed

by smallgene on Fri Jul 04, 2014 3:22 pm

AH that is what's wrong. I managed to take them out, but now the R5 resistor's wire is too short to fit. Should i just pick one up from Radio Shack?
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Re: boost converter test failed

by jarchie on Fri Jul 04, 2014 3:58 pm

That's one option. Another option would be to use one of the cut-off leads from another part. One way to do that would be to solder the 10k into the R5 resistor hole; solder a cut-off from another part in the other R5 hole; loop the cut off around the nonsoldered R5 lead; solder the cut off to R5; and trim any excess wire.

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Re: boost converter test failed

by smallgene on Fri Jul 04, 2014 4:14 pm

Unfortunately in the process of trying to remove some excess solder, the lead snapped off the resistor completely. I'll just go to Radio Shack and pick up a pack of R3 and R5 each.
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Re: boost converter test failed

by jarchie on Fri Jul 04, 2014 4:57 pm

Sounds good to me.

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Re: boost converter test failed

by smallgene on Tue Jul 08, 2014 10:10 pm

Would there be any way for me to send about $4 for just these two resistors plus the postage for the envelope?
I would be able to transfer money through QuickPay, PayPal, Venmo, Square or whatever else is most convenient.
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Re: boost converter test failed

by jarchie on Wed Jul 09, 2014 12:27 am

Digi-Key and Mouser both have reasonable prices, although in my experience, shipping is a bit cheaper with Digi-Key.

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Re: boost converter test failed

by jarchie on Wed Jul 09, 2014 2:56 pm

If you're unsure of what to order, I would go with the 10KQBK-ND and 22QBK-ND from Digi-Key. The cost is $0.20 for both resistors, and for me, USPS First Class shipping typically costs between $2 and $4 on small orders. (I live in California.)

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Re: boost converter test failed

by smallgene on Wed Jul 09, 2014 3:15 pm

I ordered exactly those two this morning. Took some time to narrow down the choices, but thanks for the confirmation that I picked the right one. Thank you.
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Re: boost converter test failed

by smallgene on Mon Jul 14, 2014 4:56 pm

Everything is working fine. Thanks for the help!
smallgene
 
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Please be positive and constructive with your questions and comments.