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pupDAC Step-by-Step Build Thread - Page 4

post #46 of 301
Thread Starter 
Quote:
Originally Posted by kyoshiro View Post

I'm using some 60/40 solder that I had lying around that I bought for soldering the O2, thought it would do the trick nicely as my other roll is a WBT lead-free.  But yeah first time soldering SMDs so need a bit more work here n there. I still havent had time to take the steps suggested as I have caught a cold, should get to it soon enough. Thanks for all the suggestions tho!

Well, we're here when you're ready.  They were all good suggestions and Kim has pointed out a couple of trouble points you may want to check when you're feeling better. smily_headphones1.gif

post #47 of 301
Thread Starter 

Got over the cold yet and had any chance to do those measurements, etc.?

post #48 of 301
Quote:
Originally Posted by tomb View Post

Got over the cold yet and had any chance to do those measurements, etc.?

Will get to it this weekend. Giving a training session tomorrow and have been hard at work preparing for that and other things for my current project. (I work in the IT Sector) But yes, may even get to it tomorrow night :) 

post #49 of 301

gnd to 3v3 next to oscilator is 3.28V

gnd to pcm's 3v3 is 3.32v

gnd to 4v5 is 0

gnd to -5v is only .3v

gnd to -2v5 is 0

post #50 of 301

welll, reflowed u3's pins that arent obstructed and it installs lol

post #51 of 301
Thread Starter 
Quote:
Originally Posted by kyoshiro View Post

welll, reflowed u3's pins that arent obstructed and it installs lol

Well, that's good news!

 

Does it completely work?  You had several voltages messed up, but some shorting pins could cause some of that.

post #52 of 301

Are the FMT0 and FMT1 pins supposed to be connected on the PCM1794?

post #53 of 301

Nevermind, looked at the schematic and answered my own question.

post #54 of 301
Quote:
Originally Posted by tomb View Post

Well, that's good news!

 

Does it completely work?  You had several voltages messed up, but some shorting pins could cause some of that.

 

nope :( 

Get hissing on LEFT channel and nothing on right channel. I probably gotta sort out those voltages

post #55 of 301

partially tried to reflow the other side of u3

 

only 4v5 is reading 0 now.... grrr

post #56 of 301

What does the +5V test point read?

If it's too much lower than 5V, this may be an issue with the 4.75V reg.

post #57 of 301
Quote:
Originally Posted by DingoSmuggler View Post

What does the +5V test point read?

If it's too much lower than 5V, this may be an issue with the 4.75V reg.

5.03V so don't think its this regulator

post #58 of 301

I seem to be getting no power from the USB. I have no idea why.

post #59 of 301
Thread Starter 
Quote:
Originally Posted by scootsit View Post

I seem to be getting no power from the USB. I have no idea why.

Sorry to hear it, scootsit - do you have some pics of the PCB you can share?  Just some info - the USB connection is fairly straightforward.  If the LED doesn't light, it's pretty much the USB connector pins or some soldering issues with L1 and R1.

post #60 of 301
Quote:
Originally Posted by tomb View Post

Quote:
Originally Posted by scootsit View Post

I seem to be getting no power from the USB. I have no idea why.

Sorry to hear it, scootsit - do you have some pics of the PCB you can share?  Just some info - the USB connection is fairly straightforward.  If the LED doesn't light, it's pretty much the USB connector pins or some soldering issues with L1 and R1.


I really gobbed the solder onto the USB jack to be sure it doesn't pull off the board. There's definitely a short somewhere between V+ and ground, it's probably in there. I'm going to fix it tomorrow. If I can't, then I'll post pictures. A few of the USB pins seem to all be connected, so I'm assuming there's a clump of solder stuck under it. Thanks for the offer, though!

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