Multilayer Repair

[@haxxorsheep]

This is next level repair! I would love to see this done on a 2022 motherboard. This is doomsday knowledge.

[@Ho1yhe11]

Sts telecom does a few good examples with iphones

[@tomasnokechtesledger1786]

That's what I call contemporary artistry.

[@Jenny_Digital]

How about a modern 20 layer impedance controlled board covered in BGA's and varying layer materials?

[@Envinite]

You throw the whole board away

[@zivilian]

Or you fix it.. the same way.. just alot smaller everything.

[@tomasnokechtesledger1786]

the thing almost have Life ON it ...

[@a.c.2659]

@@zivilian would take weeks probably :d

[@jmikronis7376]

Boards made today are considered disposable. A board that’s a replacement will have upgrades in parts as well as firmware.

[@apl175]

The use of the word excavator, drills and burr tools, and the general style of narration reminds me of dental school training videos on fillings and root canals.

[@jessstuart7495]

On a thru-hole board where the traces are connected at vias or through-holes, I'd just run a jumper wire. The most common inner-layer break is rework damage at a through-hole where someone replaced a part.

[@Razor2048]

I wonder if this can still be done with modern PCB's and if it is worth doing to test equipment where there is a chance that you will encounter a 7 layer PCB. (non working test equipment is cheap if you can repair it but it is always a gamble since you may end up with a unit that has a bad PCB trace. (I have been unable to find tools that are designed for modern PCB's which use very small traces)

[@zivilian]

modern 2018 board repair tech here: we still replace traces but now its more or less just being able to get access to them in general. If you have access to two ends, normal procedure is to just take jumper wire which we currently have down to 10 microns. All work is done in much nicer microscopes. But I am still using pace products and they are still relevant in the industry for sure.

[@TheNefastor]

This is amazing but I have to ask... was this ever common practice ?

[@ChadDoebelin]

yes, as an example in navy, on a boat in the middle of the ocean you can't just order another PCB from amazon.

[@ChadDoebelin]

also as vintage equipment gets to a certain age these skills will be needed to keep artifacts of technology for museums.

[@TheNefastor]

@@ChadDoebelin I really don't think so. This type of repair is impossible on anything made this century. As for warships, they carry spares. I don't think any warship has an electronics lab with the tools and personnel to do this sort of thing. I asked because it seems to be something that was only possible back before BGA packages, buried vias, micro vias and track widths of 100 microns. Any tech that old is no longer in use, it's in a museum.

[@phipli]

@Jean Roch There are a fair number of 80s and 90s computers still used by people for nostalgic fun. I am quite literally watching this video because I'm trying to decide if to try to repair some corroded blind vias, or bypass them completely. It's quite fun to never give up on a dead logic board. Unless a custom chip is blown, most things from up to the end of the 90s are fixable with enough determination.

[@ChadDoebelin]

@@TheNefastor you don't think any warship has an electronics lab with the personnel to do this sort of thing? Based on what experience? My statement comes from actually being in the Navy for six years and living on a ship. What about you?

[@justaguy4real]

Well what size was that wire solder? 6:55

[@fred9za]

How the hell does one know exactly were the trace is broken i.e. where along its length is it broken so we don't excavate incorrectly especially in modern colour boards.

[@therealjammit]

X-rays. Sometimes you have enough available eyelets you can narrow down where it must be with continuity tests.

[@fred9za]

@@therealjammit thanks for the knowlage I will defnatly file this away for use one day

[@patrioticwhitemail9119]

@@fred9za you can use xray if you are desperate. This should be done with a proper layer-by-layer customer repair booklet that once-upon-a-time came with every electronic device designed to be repaired, not thrown away.

[@enigmacrk200]

This is something from 100 years ago back then traces where bigger boards where not as many layered or nearly as dense.. not to mention cost has come down in combination of all these things make ake this kind of repair in the now times impractical for most cases

[@impactodelsurenterprise2440]

A cnc servo driver replacement would cost thousands of dollars. Right to repair pcb boards should still exist.

[@dreamyrhodes]

Apple: lol we will just sell you a new device.

[@dreamyrhodes]

@@carmelojonathan7729 lol k

[@tomasnokechtesledger1786]

And Chysler, too.

[@TheNefastor]

*Louis Rossmann blood pressure increase detected*

[@ISmellBurning]

Excellent... as usual.

[@therealjammit]

"Smoosh" is a technical term.

what solvent they use?

[@1UTUBEUSERNAME]

IPA

[@TheLightningStalker]

Back then I think everything was RMA. You needed special stuff to remove that. Now IPA or even just water in some cases.

[@dodgydruid]

I've been repairing computers since the 70's and not once have I used a ESD strap... I just use the other way of having the power cable plugged in but not switched on and earth myself to the chassis which when earthed to the mains has a bulletproof method of earthing far better than some soppy bit o' plastic.

[@plirofor1032]

is there available the printed material in pdf?

[@stargazer7644]

Pdf didn’t exist when this was made.

[@patrioticwhitemail9119]

@@stargazer7644 you know what he ment. Has anyone scanned an original and uploaded it?

[@havenocat]

Excellent instruction. However - the time to repair, specialized repair equipment, and knowledge, make repair of most boards now that they are multi-layered, impractical. Next generation multilayer boards ought to be snap together layers for easy separation - for diagnosis and repair.

[@patrioticwhitemail9119]

You ask the companies to throw away money for our convenience lol.

[@socks7545]

sounds like that would still require specialized equipment to separate layers and realigning without error as well, otherwise it sounds like you'd be working backwards from the intended purpose of multi layer circuit boards and that is saving space and smaller board designs

[@lotec25]

Does anyone know what Epoxy they are using in this?

[@Frank-bg6xz]

Loctite Hysol 608, used to be Epoxi-Patch which is exactly what they're using in this video. Hysol 608 is clear, but costs more money. They have an off-white one EA1C, it's less money than clear. They also have it in green. Hysol 608 is exactly what they used in the video.

[@seyedmarashi]

excellent thanks

[@techmonster2632]

What about UV solder mask

[@therealjammit]

UV solder mask is new. It's just epoxy that cures with UV instead of a chemical called a catalyst. Two part epoxy doesn't start to cure until you mix the two. One chemical is the actual stuff that gets hard and the other is the catalyst.

[@daudmeer6852]

How to detect the exact location of broken underground line?

[@Vermilicious]

Quite amusing to think about people having actually done this. I guess it might still happen, for very expensive equipment, but I doubt it.

[@CoquiAudio]

I'm wandering how my have done that method, uhmm ?

[@xxaltered7xx]

master

[@mordaljohan75]

Very interesting ,I have trying repair modern pcb , with dremel , binocular , hot air station , i abort ...i go retry !!!....i search any data about schematic pcb made in china for pc laptop ...

[@AlexandreJasmin]

Just use a bodge wire.

[@klafong1]

I watched this video, pondering the question, can *ANY* multilayer board be repaired? To my surprise, the answer is yes, but the specialized supplies, tools, and skills required are only available to professional service technicians. My greatest fear in working on these kinds of boards is, what if I remove a faulty through-hole component, and that happens to damage or destroy a plated through via? I would very likely be forced to replace the entire board.

[@jrmcferren]

The key is to prevent the damage in the first place. A proper solder extractor and technique will prevent this type of damage. Pace has some videos on this this channel showing how to use their tool, but even the generic tools use the same technique.

[@alreed2434]

Good solder wick is a must!

[@adksherm]

@@alreed2434 I wouldn’t use wick for those sensitive applications. A heated solder removal tool is really best.

[@zoreleesevten4107]

Unintentional asmr

[@Ace411275]

try watching this film at 7am, after waking up an hour ago.. I had to watch this crap for my first class during my 3rd semester of avionics school.

[@Mentorcase]

Instructor at 8:40 is cute.

[@valorizacaopessoalestima]

1988 ......2013 ?

[@fredblogs7819]

....step 2: Throw work across floor.

[@krishna34674]

hahah "but joint"

[@ThWind81]

Eh... fuck that.

[@nilamelectronics3872]

Vah mjaavigei

[@omsinchan5649]

too costly for repair 🥲

[@harakatabdelmjid9449]

EXTRA

[@johnnytightlips7501]

Double End Explorer shall be my porn name