Page 1 of 5

board testing

Posted: 17 Apr 2019, 16:11
by gillandro
hi all i am assembling my kit...all the tests were going as expected till i soldered in the chips....i power the board, the power light comes on and the first led lights fully and the other 3 dimly....i know the manual says to check solder joints....but not sure which chips to focus on or if there is a specific section of the board to focus on...thanks

Re: board testing

Posted: 17 Apr 2019, 17:24
by marcelk
There are tips and tricks on the Troubleshooting page. Specifically focus on these two sections:
  • No test pattern after build step 7
  • System doesn't start
Hope this helps to find the culprit without too much hassle.

Re: board testing

Posted: 17 Apr 2019, 18:03
by marcelk
If LEDs are of different brightness, that's a possible sign of a reversed component. I would first check that R8 is in the correct orientation: the dot must be down. However, if that's the issue, I expect the last (D8) is brightest, not the first.

Screenshot 2019-04-17 at 19.53.42.png
Screenshot 2019-04-17 at 19.53.42.png (89.62 KiB) Viewed 2268 times
The attachment Screenshot 2019-04-17 at 19.53.42.png is no longer available

Re: board testing

Posted: 17 Apr 2019, 19:25
by gillandro
and the other 5 pin resistor packs? thanks

Re: board testing

Posted: 17 Apr 2019, 19:30
by gillandro
marcelk wrote:
17 Apr 2019, 18:03
If LEDs are of different brightness, that's a possible sign of a reversed component. I would first check that R8 is in the correct orientation: the dot must be down. However, if that's the case, I expect the last (D8) is brightest, not the first.


Screenshot 2019-04-17 at 19.53.42.png

Screenshot 2019-04-17 at 19.53.42.png
yes that is the case....i mispoke...when i said first i meant to say d8 or one closest to power ok led thanks

Re: board testing

Posted: 17 Apr 2019, 19:36
by marcelk
It's all in the manual and in the Troubleshooting page:

Screenshot 2019-04-17 at 21.32.53.png
Screenshot 2019-04-17 at 21.32.53.png (52.41 KiB) Viewed 2263 times
Screenshot 2019-04-17 at 21.29.24.png
Screenshot 2019-04-17 at 21.29.24.png (77.71 KiB) Viewed 2263 times

From the Troubleshooting page:
If the “Power OK” LED is lit and stable, double-check that all components are placed in the correct orientation: the ICs, resistor arrays, LEDs/diodes and electrolytic capacitor have a polarity that matters. Start by checking the ICs and diodes. Don’t forget to check the orientation of the resistor arrays: R4, R5 and R8.
R4, R5 and R8 all have the marking/dot down.

Re: board testing

Posted: 17 Apr 2019, 19:47
by marcelk
gillandro wrote:
17 Apr 2019, 19:30
yes that is the case....i mispoke...when i said first i meant to say d8 or one closest to power ok led thanks
Ok. Note that just reversal of R8 doesn't explain the computer isn't running yet. It only explains the differences in brightness for the blinkenklights (and that is harmless by itself). So there must be some other issue. Either a solder joint or a reversed component. Once you've found it, feel free to drop us an e-mail if we need to send a replacement component.

Re: board testing

Posted: 17 Apr 2019, 22:36
by gillandro
i think r4,r5, and r8 are all backwards but ill let you know thanks

Re: board testing

Posted: 17 Apr 2019, 23:23
by gillandro
yes i will need another new r4,r5 and r8 just let me know what is needed to get those sent to me thank you for your help

Re: board testing

Posted: 18 Apr 2019, 06:03
by marcelk
Please e-mail us at support@gigatron.io and we get it arranged