cobaltmute
Headphoneus Supremus
- Joined
- Jul 2, 2008
- Posts
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- 14
Check for solder bridges. On both the TPS and after it. Hot = drawing too much current from the TPS, which implies short to ground somewhere.
Check all your pins near pin 1 (the dot) on the PCM2707. Looks like you may have some bridge their.
Test the resistance between the 3v3 point and 0V - should be high - if not you're tracing bridges.
I'd clean up C7.
The solder overlaps an adjacent trace and the solder mask does
not alway prevent a short.
Edit: Checked a bare board...they are supposed to overlap.
ARGH! Desoldered C7 to get to see the TPS chip connections better and *snap* said the tweezers and *boing* went the cap.where to get a new one here in Finland, buuh.
Tinkered with the DAC today. No progress though. A new TPS chip in place i checked for solder joints on the chips, got a 0 - 3.3V resistance of some 70ohms. When I plugged the DAC in the port the Wolfson chip gave out some smoke - bad news I guess.
Will se if I'll place a new order on a second kit and do one from scratch.
I'm sorry you're having such bad luck with it.
Well. I've got a problem
I assembled the board. Took a bit of time, but it went great. I powered it up, LED is on, no detection.
After some quick debugging, here's the status. Regulator gets hot, therefore there's a short somewhere. TP1 to ground is 0 ohm. Bad.
Reflowed the usual suspects. Even though they did look quite shiny already. No chance. I resoldered a few caps that I suspected as well, but no luck.
I'd love a second pair of eyes to help me out. Here are some macro shots:
https://picasaweb.google.com/theatilla/BrokenGrubDac?authuser=0&feat=directlink
It's something on the left side of the r6, r4, r1 arc, since on the right side there's a bit of resistance.