Paradise Builders

[stephan-schulz]

No stuffing errors to be found.
Running out of options.

 

[as_audio]

We need clear pictures of both sides of the pcb.

 

[ste]

Yes, R18c.

 

[as_audio]

I see a solder bridge on BC337 near to the wired output, picture of post 4461.

 

[stephan-schulz]

Here are the pictures.
pls bear in mind that i bought this project half started so not all soldering has been done by myself.

 

[ste]

@as_audio I think you’ve solved it…

 

[as_audio]

Wait and see ..

 

[as_audio]

4485 : soldering looks like a mess. Bad layout, miniature copper eye sizes and poor mask design are the reason.

 

[as_audio]

Did you use silver solder ? For a board like this the old style lead type is preferred.

 

[stephan-schulz]

I see a solder bridge on BC337 near to the wired output, picture of post 4461.

Removed. No changes.

Was almost impossible to solder some of the eyes. Boards are from 2012 as far as I know.

All will go into the bin. Worst project ever. Lesson learned: Never buy half started projects from people you dont know.

Thank you all for your great support.

 

[ste]

Don’t give up. It’s worth persevering.

 

[as_audio]

Do not throw them away.

It is not likely that the solder bridge caused any additional harm,
but semiconductors in the area can be easily checked in place.

It is highly likely that you can find other soldering errors.

 

[as_audio]

Looking at the copper side I see more issues.

Have a close look at all three-legged components.
It even seems one connection is missing the copper tab.

Otherwise :
let me be your waste bin. I fixed a lot like these.

 

[as_audio]

Photographic angle of the component side does not allow solder inspection.
Remove excess flux on the copper side with solvent and toothbrush.
Remove excessive solder and reflow in certain places.

I had a short look only :

 

[stephan-schulz]

Ok guys!

One final attempt to save the world 😂!
when Soccer (Saarbrücken vs Kaiserslautern) is over i‘ll resolder everything suspicious.

 

[as_audio]

Too much solder in many places. With small size copper eyes
like these it is advisable to clip the leads first and solder later.

 

[as_audio]

Paradise is a transimpedance amplifier ..

No, it is not.

 

[stephan-schulz]

cleaned up the soldering and now everything works.

(luckily i will solder the other board all by myself.)

With 10k parallel to the input I was able to adjust the voltage on the input to 0V, output being close to 0V aswell.

 

[as_audio]

You owe me four beers.

 

[stephan-schulz]

At least !!

Where are you locaed?