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EEVbog 1613 -Audiophile REPAIR: Chord Hugo DAC

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Greybeard:

--- Quote from: EEVblog on May 13, 2024, 11:08:16 pm ---
--- Quote from: Greybeard on May 13, 2024, 04:23:36 pm ---Dave, I'm quite sure that you can do it much better than here in the video (soldering).
Sorry...  :-//

--- End quote ---

What was wrong with the solder joints?

--- End quote ---
Come on... you know it.
I think just a bit too little solder, too many attempts with too little flux, not enough "shine"...
Don't the joints look a bit ugly?

syzygy:

--- Quote from: EEVblog on May 14, 2024, 01:13:58 am ---
--- Quote from: rsjsouza on May 14, 2024, 12:07:04 am ---To me the PCB design has the plus and minus pads so close to each other that it is a major fail - a catastrophe waiting to happen.

--- End quote ---

... I put some tape over the connections just in case.

--- End quote ---

You should have put tape over where the battery wrapper got cut.

I know you said that the battery cases are negative, but NOT IN THIS SITUATION!  With a dual-rail derived from 2 batteries, the CASE on ONE of those batteries is going to ACTUALLY be the -3.3V rail for the circuit.
-and if THAT battery's case touches the aluminum housing (like that one did when it got sliced) you will have a short circuit.

I'm suggesting THAT is what might have happened with the fault you saw.

thm_w:

--- Quote from: syzygy on May 14, 2024, 04:50:49 pm ---You should have put tape over where the battery wrapper got cut.
--- End quote ---

Agree you'd have a short if it cut through fully, though, the battery wrapper is: a sticker, heatshrink outer layer, and another heatshrink inner layer. Unlikely you'd cut through all of those layers without decent force. When he inserts the battery at 11:30 and pushed it in, there was still voltage on it, indicating no short had been made.


--- Quote from: Greybeard on May 14, 2024, 05:19:08 am ---Come on... you know it.
I think just a bit too little solder, too many attempts with too little flux, not enough "shine"...
Don't the joints look a bit ugly?

--- End quote ---

Looks good enough to me. No shine is due to lead-free solder.

SiliconWizard:
In french, we call that "inspecteur des travaux finis". There's always a herd of them on social media.

EEVblog:

--- Quote from: Greybeard on May 14, 2024, 05:19:08 am ---Come on... you know it.
I think just a bit too little solder, too many attempts with too little flux, not enough "shine"...
Don't the joints look a bit ugly?
--- End quote ---

Nope, they are fine.
Lead free solder, lighting and camera exposure can make anything look like anything.

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