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PostPosted: Wed Mar 30, 2022 2:06 pm 

Joined: Thu Dec 08, 2011 4:20 pm
Posts: 12
Hello y'all,

I'm helping a friend out with a BYOC 27v Boost. When soldering the components, we flipped the locations of R13 and C4. When my buddy caught the error, he ended up pulling off some of the traces on the PCB as he was unsoldering the misplaced components. I tried to solve it by running a little piece of resistor in place of the trace (the red arrow in the 3rd photo points to this repair). I tested this repair with a multimeter and got continuity, so it seemed like the repair worked.

The pedal worked for about 20 minutes and then died. The circuit will allow a signal to pass in bypass mode, but there is silence when the circuit is engaged.

Here are the pics:

I have reflowed all the solder joints and taken measurements of the ICs. Here they are:

IC7660s (and, for what it's worth, this IC feels hot to the touch when the circuit is connected to power)
1 = 9.36v
2 = 5.71v
3 = 0.6mv
4 = 5.74v
5 = 5.89v
6 = 7.71v
7 = 7,25v
8 = 9.37v

1 = 5.83v
2 = 5.70v
3 = 5.42v
4 = 5.37v
5 = 5.39v
6 = 5.34v
7 = 5.35v
8 = 8.41v

Is this pedal salvageable? Or do we now have a nice paperweight? Any input would be appreciated.

EDIT: If the pics don't load, please try the Imgur link here:

Last edited by duhvoodooman on Wed Mar 30, 2022 2:31 pm, edited 1 time in total.
Fixed image display URL's

PostPosted: Wed Mar 30, 2022 2:24 pm 
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Joined: Sun Jan 22, 2006 1:39 pm
Posts: 5639
Location: Moses Lake, WA
Your voltages aren't right. The 7660 is probably damaged. You should be getting around 16V on pin 8 of the TL072 and -8V on pin 4.

*patience is a virtue*

Please do not PM me. email is prefered.

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