Electronics > Repair
Tektronix TDS754D - acquisition board test fail
Rax:
--- Quote from: TERRA Operative on May 19, 2024, 04:25:47 am ---0.3mm solder and a conical tip on my iron to solder the legs one by one.
--- End quote ---
Do you use lead-free solder for this? I'm thinking, if lead-free was used in manufacturing it, it may be a good idea to stick with that so one wouldn't mix them.
Rax:
I'm having a hard time soldering these on. I have tried both a very fine chisel tip, a long and fine conical, plenty of flux on the board. The solder just doesn't seen to want to go on there.
* Maybe the .3mm solder I'm using is not very good. An AMZ purchase, terrible product design by using a sticky label which left glue residue on the solder. I've unwinded about 2/3rds of it and I think it's clean, but maybe the product is even worse than I thought? Meaning the rosin core missing in spots, etc.
* Maybe I should just switch to new chips as maybe the pins of these used ones are no so friendly to rework? To be clear, Terra Operative sent them pristine clean and NOS looking (so this is as far from a complaint as can be). But maybe there's stubborn oxide on those legs?
* Maybe I should use lead-free solder, in case the original manufacturing of the board used that (which I didn't think would be the case).Oh, I wish this would take a turn to the smooth path!... Pretty exhausting and frustrating.
Rax:
Well, no luck with the overall repair... I replaced those 4 SRAMs - I think work is good, see pics (I've further cleaned up the flux from there, BTW) - but I still have acquisition board errors (see log). Just maybe different errors - U200 demux now?... Or maybe just errors in its module.
TERRA Operative:
I just used regular leaded solder with additional standard Hakko rosin flux. Nothing special at all and the solder flowed nicely when I replaced the chips in my TDS794D
If your board is clean then you might have bad solder..... I'd get new stuff and reflow the joints to make sure you don't have a dry joint there somewhere.
Once you have that sorted, then we can dive deeper.
Rax:
--- Quote from: TERRA Operative on May 19, 2024, 10:39:44 pm ---Once you have that sorted, then we can dive deeper.
--- End quote ---
Soldering completed successfully, as per my prior post. I've had to look close with a magnifier and eliminated a few bridges. I'm very thorough, so I'd never turn it on before being as certain as I can the work is good. My back hurts more from examining than the actual soldering.
Though probably my "finished" pic doesn't quite depict it well, the solder joints I've done here as good as anyone's, I wager.
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