Dave troubleshoots the Back To The Future Time Circuits in 'real-time", warts and all.
A journey of red herrings, garden paths, the bleeding obvious, and the inevitability of Murphy's Law.
Can you discover the fault before Dave does?
Discussion and comparison of the Tagarno microscope vs the Mantis 3D stereo microscope.
Github schematics: https://github.com/shackspace/bttf
TLC59282 Datasheet: http://www.ti.com/lit/ds/symlink/tlc59282.pdf
Forum: http://www.eevblog.com/forum/blog/eevblog-689-back-to-the-future-time-circuits-troubleshooting/'>http://www.eevblog.com/forum/blog/eevblog-689-back-to-the-future-time-circuits-troubleshooting/
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A journey of red herrings, garden paths, the bleeding obvious, and the inevitability of Murphy's Law.
Can you discover the fault before Dave does?
Discussion and comparison of the Tagarno microscope vs the Mantis 3D stereo microscope.
Github schematics: https://github.com/shackspace/bttf
TLC59282 Datasheet: http://www.ti.com/lit/ds/symlink/tlc59282.pdf
Forum: http://www.eevblog.com/forum/blog/eevblog-689-back-to-the-future-time-circuits-troubleshooting/'>http://www.eevblog.com/forum/blog/eevblog-689-back-to-the-future-time-circuits-troubleshooting/
The live camera feed: http://www.eevblog.com/live'>http://www.eevblog.com/live
EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2
Support the EEVblog through Patreon!
http://www.patreon.com/eevblog
EEVblog Amazon Store (Dave gets a cut):
http://astore.amazon.com/eevblogstore-20
Donations:
http://www.eevblog.com/donations/
Projects:
http://www.eevblog.com/projects/
Electronics Info Wiki:
http://www.eevblog.com/wiki/
Done.
We have all done this rabbit hole stuff. Excellent video.
Once, again… a good set of steel picks is essential for SMD rework. Every time you finish a chip, lightly rake the pins with the pick and watch for movement. (Don't pull on them too hard!)
Schematics with pins stubs and nets labels only are my PET HATE!!!! Hate, vomit, spew…..
My first thought would be to check that the flux capacitor is, err, fluxing.
You can see the pin move when you touch it with the probe
Love it. I’m thinking of making one for my classic mg midget. Would be such a laugh but struggling to find enough resources to pull one together
Pin pitch did not look off the angle of the chip was off. It looked to me like it was tilted to the left a few degrees.
So delightful to watch ! Have a good day
at last 🙂
finally messing with things at your level there i see…
I don't understand this language or wtf you're doing but I'm here for it
Also goes to show how a basic scope can be a useful diagnostic tool – don't underestimate the power of even an old single channel analog scope when troubleshooting. Also, most problems lean more towards the basic than the complex.
Multiple failures nearly always screw up your logical substitution method, and initially lead you in the wrong direction. We all do it, and 40mins is getting away with it lightly.
If connecting the power wrongly damages one chip it rather makes sense to assume the others are at least likely to be worthy of inspection. What this teaches me is: stand back and take a few moments to see the whole situation instead of focusing in to a single known fault.
Dave thanks for all the time and effort you put into your videos.
3 separate devices showing the exact same symptom, to suspect 3 separate failure instead of a single failure wouldn't be terribly sensible. especially considering that they all had the same symptoms…
Only hint that all three may be dead is the fact the are all connected together serially, so the first killed the second and third… it's lucky that they didn't re-kill your repaired no1 chip..
First rule of rework, if it doesn't work rework lol
You could also connect a GPS to the Arduino to get Satellite accurate time and date.
Why did you use a soldering iron instead of an SMD rework station?
TLDR: Dave messed up
Hey Dave, great vid. Love the Pulp Fiction reference 🙂
It is displaying dingbats and hexadecimal!
Stoked you nutted it out! Would love to have a clock like that to go with all my BTTF stuff. Just started playing with arduino so ya never know, might just be able to build it one day. Top job mate.