Crack with Speedball - Sound gone in left channel

[ajswaagman]

Crack with speedball had worked well for about 3 weeks.  Today i there is no audio in the left channel except for some noise/popping occasionally.  All LED's light up except D1 on board B pictured.  It also appears that the D1 LED is charred if you look closely.

Thanks for the help!

 

[Paul Birkeland]

How are your voltages?

 

[ajswaagman]

Now the LED is lit and the amp works fine.  it does look like the D1 LED on the B board illuminates more from the bottom than the top, so maybe i missed it initially in a room with more light?

I guess i'll monitor the amp and see if the left channel drops out again.  Both times(left channel not working/amp working) the amp had just been turned on so it doesn't seem like a bad solder joint heating up and failing or filling properly and working.

voltages
1: 73.7
2: 182.6
3: 0
4: 182
5: 71.5
6: 0
7: 104.2
8: 0
9: 103.2
10: 0
11: 0
12: 0
13: 181
14: 0
15: 201
20: 0
21: 220