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HIFIDIY PCM1798 DAC problem (No Sound)

post #1 of 4
12/30/09 at 10:10am
Thread Starter 
I just finished building the DAC but unfortunately i cannot hear any sound.



When i connect the USB, the LED indicator is glowing but not the Coaxial LED indicator. Computer has recognized the DAC and installed the drives too...but i can't hear any sound. There are 4 opamps on this board and two of them are showing no voltage at all.... What could be the possible causes ?? I emailed Candy about this but he/she is yet to respond to my question.

The voltage reg 7805 is getting slightly more than warm....can touch it. But one more SMD reg LM1117 is getting very very hot. It should output a voltage of 3.3V but it is showing only 0.3V...

Did anyone build this DAC ??
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post #2 of 4
12/30/09 at 10:15am
Thread Starter 
Here is what i found of this DAC....There are a total of three SMD regs and one 7805. Two SMD regs are working fine as per my multimeter. The one which is at the top is showing output voltage of only 0.3 while it should be 3.3

Could be this the reason for not getting voltage to the OPamps ??
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post #3 of 4
1/4/10 at 6:36am
Thread Starter 
I have fixed the voltage issue at the regulator.

But still i find there are no voltages at the indicated opamps.

How to debug this issue ?? Do I need a layout diagram for this ?
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post #4 of 4
1/4/10 at 7:24am
Thread Starter 
I left the DAC switched on for one night and now there is no source LED (SLED) glowing ......... the DAC was showing distortion when i played it for the first time and i thought there might be some loose connection.
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