[Diy_efi] DIY-WB electrical problems

[Brian Renegar]

Bob, unfortunately, I don't have the second board now.  I built one for a 
friend.  I had tested it to make sure that it at least worked during closed 
loop idle, and then gave it to him.  I never tested my board until now though.

BTW, forgot to mention...  I built both boards together, and had 
accidentally put the LED's in backwards.  After realizing this, I put new 
LED's in the correct way on both boards, and his worked.  But could I have 
damaged some of the other components on my board?  Some of the voltages 
were way off what they should be.

Brian


>Brian,
>
>Having a working board will help immensely. Place the two
>boards side by side and cross-check the components. Can
>even use a DVM to check the resistance of one resistor then
>the same resistor on the other board.
>
>Then flip boards over to solder side and visually compare
>the two. Look for solder shorts and differences between
>the boards.
>
>On #12 below, 7.886V is close enough to 7.9 volts. Have to
>keep in mind that even DVMs can be +-1%, with +- one digit
>on top of that.
>
>BobR.
>
>Brian Renegar wrote:
> >
> > I built two diy-wb units.  The first one worked perfectly.  But the second
> > one is not working and seems to have some issues.  I followed the
> > troubleshooting directions up through # 24, and it failed several of the
> > tests.  Here's my results.
> >
> > <DVM ground to J12>
> > #10  Voltage at U4 pin 8 (should be 2.5V);  I got 4.433 V
> >
> > #12  Voltage at U3 pin 5 (should be 7.9-8.0V);  I got 7.886V but sometimes
> > it would decrease below that
> >
> > <DVM ground to J7>
> > #14  Voltage at U4 pin 14 (should be 0.45V);  I got -1.485V    Voltage at
> > D8 pin 2 was correct though (1.231V)
> >
> > #16  Voltage at U3 pin 12 (should be -4V);  I got 0.79 mV
> >
> > #20  Voltage at U2 pin 5 and 9 (should be 0.45V);  I got 0.449V at pin 5,
> > but -3.968V at pin 9
> >
> > #22 Voltage at U3 pin 9 (should be 0V); I got 2.763V
> >
> > I also got 0.4V at ISO1 pin1 and 2, but then checked again and got 0.1mV.
> >
> > Any help figuring this out would be appreciated.
> > Thanks,
> > Brian
> >
>
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