Dave shows you how to rework and replace a blown SSOP surface mount SMD chip with ChipQuik, solder wick, and drag soldering. And also mentions other methods using a hot air gun and pre-heater.
Can he fix the Back To The Future Time Circuits and restore the timeline to it's original order?
Bonus rant about the lack of PDF schematics in Github projects.
The BTTF Time Circuits were designs and made by Shackspace
https://github.com/shackspace/bttf
http://shackspace.de/?p=4343
Video of Dave blowing up the Time Circuits:
https://www.youtube.com/watch?v=ehXw1Amj40E
Forum: http://www.eevblog.com/forum/blog/eevblog-689-how-to-rework-solder-smd-chips-bttf-time-circuits-repair!/'>http://www.eevblog.com/forum/blog/eevblog-689-how-to-rework-solder-smd-chips-bttf-time-circuits-repair!/
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Can he fix the Back To The Future Time Circuits and restore the timeline to it's original order?
Bonus rant about the lack of PDF schematics in Github projects.
The BTTF Time Circuits were designs and made by Shackspace
https://github.com/shackspace/bttf
http://shackspace.de/?p=4343
Video of Dave blowing up the Time Circuits:
https://www.youtube.com/watch?v=ehXw1Amj40E
Forum: http://www.eevblog.com/forum/blog/eevblog-689-how-to-rework-solder-smd-chips-bttf-time-circuits-repair!/'>http://www.eevblog.com/forum/blog/eevblog-689-how-to-rework-solder-smd-chips-bttf-time-circuits-repair!/
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.
Wouldn't a simple diode have protected that whole thing?
how to do it with 88i6745-TFJ1
Dave: "My chips disappeared magically!!
Me: Don't worry, this is normal business at my house… A few cable ducts (a few hundred bucks) disappeared magically after I laid them directly in forn of my dad's desk (like "Hey, this time you can't get around helping me to install these").. They never reappeared…
Wow. Must . find. one. you . fix… 🙂
I been looking for something like chip quick. I been destroying boards because I didn't have something like this. I thought I needed to get the temperature higher.
Hmm. I'd check the reworked chip, if the soldering is good enough. :-}.
(late but maybe better then never)
Let me just make a quick complaint here – you should never be committing a PDF of the schematic to the repo since it isn't a source file. It's a compiled file, really.
I agree with you 100% Dave – that stereo microscope must be fantastic to use for fine SMT work. I recently spent about three weeks off and on attempting to reattach a 144pin TQFP with a unregulated Weller 2012 iron, 5mm solder and a 10x jeweller's loop. Needless to say I failed – due partly to removing a pad while trying to clean my excess solder off for yet another try. Also, by that point all the CPLD's legs were badly bent and the final death knell came when one broke off as I was trying to straighten it. That hurt – a LOT – as the work piece was a retro graphics board for a 1980's Atari home computer and had taken months and months to save up enough to buy in the first place. One of those microscopes with the vast depth of field and cavernous working distance would have made all the difference. I can't tell you how much I grew to hate the smell of burning plastic when I time and again touched the barrel of my iron against the loop, all the while singing my eyebrows as I was crouched about 15mm from the joint. Oh, for that stereo scope…!!!
The problem is very simply the cost.
I am an amateur hobbyist – not even a full-blooded hobbyist! – and trying to get back in to electronics after more than twenty five years. I am giving it a try as a means to keep a mental focus and battle depression. I also have almost no income. I had to sell a kidney just to buy a rebadged Atten soldering station. I cannot afford a multimeter more expensive than the £10 ones you get in car parts shops. An oscilloscope is pure fantasy – I can't spare any more body parts!!! I bet more than a few hobbyists are in a similar position.
Humour aside, it would be incredibly useful if you would do a video – or better yet series – about real budget electronics; not the super swish gear but how to get the absolute best value from the least cost, or at least workable value from reasonable cost.
So one thing i have a hard time understanding, is how do you know what SMD device is bad on a motherboard? There are so many…
Dave no offense but you are a horrible solderer especially considering the MASSIVE amount of tools and equipment at your disposal and your experience in the field. I'm a avionics technician and if I performed repairs to your quality I would be fired and have my certifications revoked. Your hardware troubleshooting is also not on the so fast side.
Was there a video before this one, that showed the troubleshooting and how you figures out what was wrong with this circuit?
Watching that (de-)soldering was reeeaaally painful… sure, everybody has his own preferred techniques, but taking it off only with wick (since it's broken anyways), and stitching the new one on with some finer solder wire and a pencil tip would probably have done the job in half the time. (and is it just me, or is this QuickChip stuff rather awful to clean off, which makes it quite-not-so-quick instead?)
I replace quite a few chips at work… If I don't need to save it for some reason I just use an exacto knife and a soldering iron to lift the legs, only takes a few seconds…
no wonder this circuit failed. it says made in japan
Dave, you missed the key mark (white oval) that indicated how to align your ribbon connector.
EEVblog With your capture card, why not use the Avermedia GameCapture HD2 it's PC free and records directly to either usb or an internal HDD. Has HDMI in with Live Passthrough
ChipQuick!? More like ShitQuick!! hhahahahha
I like this guy
cheers from romania
How did you keep the solder from not blobbing up and shorting out the pins? (like a huge puddle?) Does the flux keep the solder only on the pins?
Could the ChipQuik cause the cold solder joint that you found in the next video, if not cleaned off well enough?
Great scott
PDF schematics are a must…
Another easy way to remove SMT packages with leads is to carefully cut the leads with a sharp knife (don't cut the board), then you can just swipe what's left of the leads off with your iron.
hablas demasiado amigo !! dale con mas calma 😉
Yeah this is another case of the cooler something is, the more likely something is to go wrong.
It's a little riskier, but you could also cut the pins off and wipe them away with the iron. Does not work for thermal pads of course
Hi Dave, we have here in Mexico some kind of green paste to remove SMT chips very fast, I don't know who made this paste or what's on it (I heard it has some nasty and poisonous stuff on it so it's forbidden in some countries) but it still works great. A 4 CC jar can remove more than 200 chips ! Please let know if you want me to send a jar of it and a video of how to use it for you to demonstrate how it works and how safe or dangerous it can be.