TDA2030 Hum - Page 2

johnr66 · 20th November 2012, 04:19 PM

Where does the green wire go on the supply in? I see only two wires off the transformer's secondary. Unless it is out of the picture, the green wire must be connected to the center tap on the transformer's secondary.

use a 40 watt bulb tester when setting this thing up.

prezden · 20th November 2012, 04:47 PM

I connected the on board pot and inputs. Still humming away with no sound (music) This is most confusing

Robert Kesh · 20th November 2012, 08:29 PM

Quote:

Originally Posted by prezden

Could the damaged cap cause the hum?

yes. it is possibly shorting out whatever is connected to it.

prezden · 23rd November 2012, 07:49 PM

Part 2: I replaced all the caps and have had 50% success. One channel is working quite well. There is a very slight hum. The other channel has no audio and a loud hum. I have narrowed the problem down somewhat. By removing one of the caps (C8) the hum is gone but there is no audio. I have tried 2 caps at this location with the same result.
I'm stumped

prezden · 24th November 2012, 06:17 AM

Hello again- I replaced the c8 it still hums. By bridging between c8 and the output gnd the hum completely stops but there is still no audio. It's a shame because the other side sounds pretty decent.
Any ideas?

Jay · 24th November 2012, 07:49 AM

Looks like a bridge amp PCB??

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20th November 2012, 04:19 PM	#11
johnr66 diyAudio Member Join Date: Mar 2009	Where does the green wire go on the supply in? I see only two wires off the transformer's secondary. Unless it is out of the picture, the green wire must be connected to the center tap on the transformer's secondary. use a 40 watt bulb tester when setting this thing up.

20th November 2012, 04:47 PM	#12
prezden diyAudio Member Join Date: Nov 2008	I connected the on board pot and inputs. Still humming away with no sound (music) This is most confusing

24th November 2012, 06:17 AM	#15
prezden diyAudio Member Join Date: Nov 2008	Hello again- I replaced the c8 it still hums. By bridging between c8 and the output gnd the hum completely stops but there is still no audio. It's a shame because the other side sounds pretty decent. Any ideas?