SOLVED El Sol no sound

[drgonzo1969]

Ive been trying to troubleshoot this El Sol PCB. The LED lights up when the effect is on but no signal. I get signal when the pedal is bypassed. Here are some photos of the pcb. The IC's are LM386N

 

[Fama]

Everything looks correct on first inspection (although I am no expert either). One stupid question, I assume you double checked that you had the input and output the right way around when you tested it? It sounds like yes since you said you've been troubleshooting it for a bit, but that's an easy mistake to make with unboxed stuff.

 

[BuddytheReow]

Clean your board from flux with some isopropyl alcohol and a (spare) toothbrush. You most likely have a bad solder joint and it’s hard to tell from the pics. Be careful not to get any inside the pot

 

[music6000]

Definately Clean the Board & check if that is 68K = Blue, Grey, Black, Red, Brown?

 

[Laundryroom David]

Looks like you might have a wiring oopsie from footswitch to board. Doublecheck switch and ground from the footswitch to the board.

 

[music6000]

Looks like you might have a wiring oopsie from footswitch to board. Doublecheck switch and ground from the footswitch to the board.

It looks a bit ragged but it looks correct.

 

[Laundryroom David]

It looks a bit ragged but it looks correct.

Right you are. I zoomed in more.

 

[drgonzo1969]

I gave it a good scrub with brush and rubbing alcohol and reflowed all the solder points. still no signal. i got the multimeter out and this is what i got on the ic's.

Pin 1 - 0.74v pin 8 - 0.46v
pin 2 - 4.22v pin 7 - 0v
pin 3 - 8.94v pin 6 - 0.12v
pin 4 - 8.3v pin 5 - 0v

 

[JamieJ]

Your pin 4 has 8.3v and it should be 0v as it’s GND. Also you have 0.12v on pin 6 which should be your positive supply.

Your wiring to your power jack is reverse. Swap these and test again. This should fix it if all is well.

 

[music6000]

I gave it a good scrub with brush and rubbing alcohol and reflowed all the solder points. still no signal. i got the multimeter out and this is what i got on the ic's.

Pin 1 - 0.74v pin 8 - 0.46v
pin 2 - 4.22v pin 7 - 0v
pin 3 - 8.94v pin 6 - 0.12v
pin 4 - 8.3v pin 5 - 0v

Is this your numbering order as your voltages are way off:

 

[Nic]

Your wiring to your power jack is reverse. Swap these and test again. This should fix it if all is well.

View attachment 48628

To me this image looks like center positive wiring. I always wire my negative on the big tab and works perfectly. I think @music6000 point about pin order. Or the power supply used is center positive ?

 

[music6000]

Your pin 4 has 8.3v and it should be 0v as it’s GND. Also you have 0.12v on pin 6 which should be your positive supply.

Your wiring to your power jack is reverse. Swap these and test again. This should fix it if all is well.

View attachment 48628

It is wired Correctly.

 

[drgonzo1969]

Ya that is the order i read the pins. Double checked resistor and cap values. but still cant figure out why im getting those funny readings

 

[Laundryroom David]

Ya that is the order i read the pins. Double checked resistor and cap values. but still cant figure out why im getting those funny readings

Hmmmm.

What kind of power supply are you using?
Where did you get the ICs?

 

[music6000]

Hmmmm.

What kind of power supply are you using?
Where did you get the ICs?

9V

 

[fig]

What's the voltage showing at the cathode of the protection diode? [sanity check]

 

[drgonzo1969]

i got 8.93v on cathode of protection diode

 

[drgonzo1969]

i've tried it on my walrus audio power supply and my cheap amazon power supply. they are both center negative

 

[music6000]

Where did you source those LM386N, What Brand is written on them?
Take a Pictue so we can see the writing?

 

[drgonzo1969]

Huh looks like i bought these LM386n from BOJACK on amazon.com in 2020