Help please/ Debugging how to?

[Moltenmetalburn]

Ive got a pile of non working builds piling up. It seems for every one I get built another doesn’t work and I don’t know enough to get through them on my own. after an integral preamp I built today doesn’t work yet again I am pretty frustrated.

My integral is farting and distorting. I reflowed everything thrice. Then I swapped all the Electrolytics, one film I suspected, and the Q2 transistor. Still a farting crackling mess.

After blindy swapping 10 parts and no change I need help.

How do I learn to debug and use an audio probe??? I bought one but haven’t experimented yet.

getting so frustrated it makes me want to give this up at times.

I see some extremely talented people here helping others debug, I could use your help as well.

thanks!

 

[Moltenmetalburn]

Still just lying here dead.

Anyone have any other ideas. Im not sure what else to do but blindly poke at circuit with probe. ??‍

 

[music6000]

Post Good pictures of Front & Back of PCB in its current form.
If you stop following up on a Issue, Members will stop trying to sort out the Problem!

 

[Moltenmetalburn]

Post Good pictures of Front & Back of PCB in its current form.
If you stop following up on a Issue, Members will stop trying to sort out the Problem!

Pictures were posted above. I can take and post more.
I didn’t stop following up? ??‍ Others clogged up the thread asking about my resistors because I posted pics.

 

[music6000]

Pictures were posted above. I can take and post more.
I didn’t stop following up? ??‍ Others clogged up the thread asking about my resistors because I posted pics.

Post Good pictures of Front & Back of PCB in its current form.
FULL SIZE FRONT & BACK Pictures including Jacks & Footswitch!

 

[Moltenmetalburn]

Post Good pictures of Front & Back of PCB in its current form.
FULL SIZE FRONT & BACK Pictures including Jacks & Footswitch!

What you are asking for was included. Jacks/full size etc. I just reviewed all the pictures, and those pics were as large as the forum would allow me to upload.

I will take some more when I get home and post them again to see if I can get anything larger/clearer. ??

 

[Moltenmetalburn]

Post Good pictures of Front & Back of PCB in its current form.
FULL SIZE FRONT & BACK Pictures including Jacks & Footswitch!

I took some more pictures and tried to get everything sharp enough to see. Not sure if they are better. ??‍ Let me know what you think.

 

[Chuck D. Bones]

How can you not tell if your pix are any good? Your resistors are pretty, but are nearly impossible to read. Too much glare.
Looks like the switch & jacks are wired correctly.
Your board needs to be cleaned. Then reinspect everything. Check solder joints, component values. Those resistors are a snug fit, it's possible you cracked one. That's why we're making in-circuit measurements.
Going back to your May 24 post, set your meter to a higher scale and measure it again. I think the meter is overranging.

 

[Moltenmetalburn]

How can you not tell if your pix are any good? Your resistors are pretty, but are nearly impossible to read. Too much glare.
Looks like the switch & jacks are wired correctly.
Your board needs to be cleaned. Then reinspect everything. Check solder joints, component values. Those resistors are a snug fit, it's possible you cracked one. That's why we're making in-circuit measurements.
Going back to your May 24 post, set your meter to a higher scale and measure it again. I think the meter is overranging.

I wasn’t concerned with the resistor values as they are already confirmed and well visible in the other picture set. I didn’t even look at them in this set to notice the glare.

I thought the solder pads, switch and jacks were what he was asking to see more clearly.

Inspecting the resistors I see no damage anywhere and have never had any issues installing these previously. I would expect cracks to be easily seen?

Ive been through every solder joint. Inspected everything for weeks. Component values are correct, Ive checked them all as far as I can tell. Ive since built three more working TC preamps on various pcb. This one is just a mystery to me and my limited knowledge.

I simply refuse to give up and see it as a learning experience. dont want to keep adding to the dead build pile.

I need to get more alcohol to clean the pcb better, ran out recently.

I’ll recheck “post 24” etc with the meter set higher and report back

thanks to everyone willing to help. ??

EDIT: I just rechecked the value of every single component on the board again under magnification. electro polarity, etc.
Everything is correctly placed and valued.