Repair of a Garmin GPS unit, with characteristic Dave screw-up and Murphy.
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#Repair #GPS #Garmin
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Hi just a quick video this: Garmin GPS what model is it for those playing along at home? The new V 25 97 LM T There's so many bloody models Anyway, it is relatively old and this died on our road trip recently. It's well, it didn't die. it's the problem is is that is loosey-goosey USB connector which is used for charging. Of course it does have its own built-in battery, but so once it's charged, it lasts.

you know, day or something, but then it's dead unless you can charge the sucker up again. So I tried multiple leads when I was out on the road and sure enough it seems to be the connector in there and that's probably just right angle PCB mounted and that that feels really loose till anyway, let's crack this sucker open for little itty bitty talks is here and maybe some plastic are there itself. Stoppers Now that threaded threaded insert, rubbish straight into plastic. No workers.

got to get the price down. A few plastic Clips around the outside as well I Don't expect that to just come off. No. I thought there might be a screw under the barcode there, but no, you get in there and that looks like just injection molder port for the plastic.

and today. oh, that's a nice little compact batteries and it's not one of those. It's got its own plastic molding in the case there. that's it's really quite nice.

I Like it. Yeah, it's a reasonable size speaker that they can get in there. and of course they've got the LCD But it's all happening under here and we've got a can. Can we get that up? Of course we can.

We're in like Flynn but unpopulated footprint there. Wonder what that one's for? Don't know. Not really fast what processes are used is that one? Oh, that's one of those TI application processes jobbies. that's an upside down media.

Tex all the electrons are gonna fall out and that would that the GPS and these little spongy things here just ground connections through to the metal back in plate. Nice on the LCD. They do that for compliance reasons and as external Wa micro SD card and not much else. Anyway, we need to get that board out.

Tell you what I do Like that they use the same screws that ones under a bit of sticky tape as the outer case. That's just you know. Nice touch when you're designing something you know to use all the one type of screw reduces your bill of materials. Yeah, a number of items on there that you can potentially just screw up or or not find or whatever.

And like assembly, you don't have to change tools and disassembly and repair. You don't have to change tools. So win-win-win And there's our patch antenna and we've got more goodness on the bottom. Let's crack that open Tada.

There we go, so we'll go down. Memory: Yeah, more memory. Not too fussed about the details, what we're interested in, that's socket. and let's give it a bit of a wiggle.

wiggle wiggle Yeah, shall we? And oh yeah, look there you go. All the data pins Wow All the data pins have come up. All of them. That's actually good.
I Can just reuse that. I Should just be able to re solder that, but it might know how the pads lifted. I Need to get closer. Look at that.

Wow Every one of those joints is broken every one of them. which is quite unusual because solder. A lot of people think solder is, you know, not supposed to be used as a mechanical strain relief, but that's its two main purposes. Its electrical connection, of course, and then mechanical rigidity of the component to the board, join in it and well, look, all of them are cracked.

So yeah, bloody lead-free rubbish is it. But yeah, Wow There you go. But that's actually really good. It means that the connector is not damaged.

you know, because I don't carry one of these in stock, let alone one with that actual, you know right surface-mount footprint might be able to rustle up one that's a standard right angle, but not a sorry vertical one like this. But there you go. So that's actually a good thing. It looks like the ground pad over here has lifted though, but that's no big deal.

Still got the other ground peg connection over there and that's not the end of the world. Even if both of those were broken, or even if you're needed to, you could fix that. But yeah, I brick and I just sold a we call that off and just put on some fresh solder and Bob's your uncle. All right.

let's check this sucker out under the Tigana Here you can see that: Wow that's really remarkable, isn't it? This GPS is lower. quite all. it's been there for many years. Just you know, the vibration and the stretching and the stress from the leads and stuff like that has just really caused that to completely come a gutter.

No, there's little, um, you know, dendrite II type things there. I'm not sure what the deal deal is there, but anyway, I've got to hold this thing up at an angle. Otherwise, the damn thing focuses on the top of that top of the connector. Just clean it up first.

You know you could argue. Just take off the whole thing first and then clean up the pads. Maybe I do that should just lift it's got to cut out in the board and then once that's done, then you get in there, clean up the pads, and flip the flip the connector over and get on the bottom side if the pins because it's quite hard that inductors in the way. Little pain in the arse.

there. There we go. Now it's all in focus. small eyes, depth of field things.

See if we can heat this sucker up and remove that? Yeah, no walk-ins. Oh I Thought that was a bad. It's not. It's just a gap between the other one.

Pat over here. that one's come completely off, but no workers today. No, it's not. Oh yeah, yeah, it's connected.

Yep, there's some vias there and the one on the other side there that's connected to its ground plane here with this cap and over to the inductor here. So whether or not we need that, see where she's going. So it's these two here, so it's going into there. So yeah, we might have to do what? Reattach that I Wouldn't like to think that we can get away with that.
We might anyway. we can put a little mud wire on there, but now we can get into our little connector, see the copper pads pulled off there. Nothing you can do about that that wasn't me and there's some coppery goodness also peeled off on that side again. Once again, that wasn't me.

That's all the flexing over the years. It's a good way to do this is just maybe put some fresh stuff on there like that and then potentially wick that off. There we go. Another crap: - I get a nice little like cleaned up connector that we can reuse their beauty because I ain't buying one like that you proper ten.

It's probably an off-the-shelf our vertical mini baby. but anyway, you know, cleanup pads on here, bloody speaker wires I sold it on, so that makes it really rather annoying. Kind of like flip it over like that before I can work on it. Now here's where you want to drop your temperature down a bit.

So I've just dropped it down to 330 from 370 so we don't want to lift any more pads. ploy from some fresh stuff there. Then we'll just wake it off and you really don't want to scrape the wick because that can lift your pads too. So yeah, the ground plane nicely cleaned up.

Sorry for the overexposure. they're too much light. Can never have too much light noticed. I'm changing my glasses here I've actually got a special higher magnification here which it allows.

It's better for working like this. I Just thought I'd swap but it's fine. Say it. see it before I Can see it without no problems.

but you know it's better or more better I put that puppy back in there like that and just sort of that sucker. Inductors Really annoying. Sometimes you get ones in the way like that. Here's my point: three eight millimeter stuff here.

Yes I'm using the lid. three rubbish. I Kept forgetting the instructions for the Takano remote control thing I'm gonna have to like print out the Flint you can leave it, you can do some stuff with it. it's not.

um, it's not the best user interface. Let me tell you, get one on the ground rounds in place. First there we go I'll hold It, there Yes. I've changed my tip here.

so just pull it out while it's hot. My silicon mat? No workers. oh you know, curious. I'm using my pacer ATS 200 Here there we go onto a small chisel Doctor is annoying little turd there I just freshly tend my tip there.

Okay, so it's important to keep your tip clean. Yeah, too much solder. Nice. Another side looks a bit ugly.

flux residue on there, but yeah, yeah, that looks like a bought one down in there. This turd. How can we do that? Get a mod wire over the other side of the board because some days or just scrape it right. scrape those videos.
they're bloody scalpels gone walkabout. Wow, that's really hard to do. Could of course remove the inductor little. There's I think it's going to be easier just to scrape his top-hat here off smooth.

how are you doing? and I'm just running wire. It's actually room down there to run a blood war if you're happy. I could actually go from the top of the frame there over to there. that's dog.

I'm actually using the mod wire to prop my little webcam up here. That's annoying because sort of just a short length under that. The problem with that is is that the heat just conducts straight down the warrior and just going to heat up both pads and it's just going to like fall off. it would be really annoying.

So what I'm going to do is actually I just make a short little jump a wire even if you have to fold it back on itself. it's just gonna make the solder and easy. put a bit of flux in there. There we go.

That pad looks like it's taken there. We go. good enough for Australia So that does look like long and boggy there. But yeah, trust me, that was easier than trying to like budge in a tiny little wire across there.

like that. It does the whole thing. it just heat up and it's just fall off. Nice colors in that.

All right. So that's all. back in close the case, let's see what's what and of course I'll have to check that it communicates with does the serial comms but because that's how you update the maps and and a pair up, don't I have a problem I Think they might be assured in there actually cuz this connector was heating up. Wow did I completely screw that? It could be people screaming at me.

There's two vertical ones. Is it the horizontal ones like that at the Edit No I've chosen the wrong pad star dumbass. Dave Too busy worried about the shoot? That's power idiot. It's like just the orientation.

I Just saw the two pads right next to each other to little videos right next to each other. and OH So yes, I looked at the other side and it goes to the inductor. It's the power I Don't even have to measure that. So yeah, dumbass.

Dave And so it happens when you don't even reach engage your brain. so I'm debating whether or not we even need to put that back at all. actually. I Just flip the board back out.

Okay, that's our wonky one. It just. no. it goes down through those two videos and there's nothing down there.

I don't think there's a trace that goes under the inductor. And of course this one's This one's connected over here. and then the V is everywhere else and everything. Hunky-dory Yeah, Check it out.

Look, those fears don't go anywhere. They just fierce next to the pad. This thing's fine I don't think it needs any wire there at all. I was mistaken because I mixed up the other two vias and thought that it actually went somewhere when it didn't I Get some light under there.
Yeah, it doesn't seem to be going anywhere. There's two beers there seem to be flapping around in the breeze. Yeah, yeah. Once again, you get light behind that.

Nope, ain't going nowhere. Don't see any other shorts in there? Yeah I Need to clean this thing up - bit messy, but there's pets. Don't go anywhere. Something weird happening here.

It's just sort of like a rebooting. It's very strange. It's not supposed to do that. Hmm, no.

oh look a flicker. No something going on. You are not going to believe this. I am copying Murphy today Wow Unbelievable.

all that. sort of like weird resetting stuff and like a glitching on the sleigh and all that was caused by not anything I did a bloody dodgy little mini B look at the pissant little cable on that unbranded not marked, not rated, not anything and toss her straight in the bin that was just dodgy as so that was like causing voltage drop and the processor just wasn't getting enough and it was resetting and hiccuping and doing what not and like I replaced the cable and I just tested it on the PC and it's fine. it connects it so everything's winner. Winner chicken dinner.

I could have really chased a red herring down a rabbit hole there, all because of a bloody USB cable. You know you would think that that was something that I just did like so I could have gone down I could have spent ages on that, but no, it was the bloody cable like I knew I visually inspected that everything looks fine. this sucker should work and sure enough I did actually suspect the cable and that was it. Unbelievable So you can, you can really come a gut so there very easily thinking the first time it's happened God if I had a dollar for every time it's happened probably Murphy's got me like that where I've like done something you know I'm repairing something, designing, building, troubleshooting, testing, doing whatever.

It turns out to be nothing that I did. but you know some other equipment, a cable, a connection, or something like that, you know I get any satellites in here CGP if simulated is turned on Awesome. So there you go that works fine. that's now charging up.

it's talking, it's communicating, it's doing whatever. Yeah, I could probably like put some epoxy in there I might actually do that. Maybe put some epoxy on that connector just to really put it in place. Because yeah, it's not the best design really that the USB connector.

it is relying on those pads and they really can be quite solid. but as you saw, one of them was barely connected to nothing. just had some vias there went through to the other side. No, you know.

but when they're actually connected to large pads spread out over the board and you've got lots of pads and you know they can be really structurally sound. but you know vibration. It's in the car of course and it's vibrating. It's over the years and it's get a lot of stress.
you plug it in and plug it out. movie GPS around because this wasn't like permanently mounted, it was kind of like it's just like down in the center console kind of thing bit flapping around in the breeze. and yes, I gets a lot of stress that connected. But anyway, that's fixed.

so there you go. Oh man, oh yeah. and I'm not gonna edit out that goof I've me doing that because hopefully you'll learn something from that that it's easy to make a gif like that when you just assume you know assumptions are the mother of all screw-ups. and well, that just yeah happen there.

I shorted out the power connector got hot. it's a good good. My USB pack. you know it handled that to find it must have a resettable poly switch in there anyway.

I think it continued to dump the power in actually cuz that cable got quite how. it's not like it. just you know. stopped excuse like that happened but noticed it pretty quick and no damage done and that's a repair.

GPS So anyway, if you like that and if you like my screw up, please give them a big thumbs up. And as always discussed down below and the Eevblog forum and Eevblog dot TV domain which now links to my library channel so check that out and subscribe trying to hit 5,000 maybe I can do it by this video. Catch you next time.

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By YTB

22 thoughts on “Eevblog #1281 – garmin gps repair”
  1. Avataaar/Circle Created with python_avatars BlueStar♦️ says:

    Is there any portable Chinese car GPS 4.3 inch , wince type, repair .

  2. Avataaar/Circle Created with python_avatars Stabbo TheHappyClown says:

    I took out the 4 screws in the corners and I can't get the back of the case to pop off. I wish you had shown that step!

  3. Avataaar/Circle Created with python_avatars Brian Banks says:

    my gps charges ok but it won't connect to computer…guess what, I am leaving it for now…no new updates or transfers but oh well….great video!!!

  4. Avataaar/Circle Created with python_avatars Luis Herrera says:

    De lujo me gusto

  5. Avataaar/Circle Created with python_avatars GARY GARNETT says:

    How about I send you my Garmin 420s it needs a new screen as it’s been in the middle as sun too long

  6. Avataaar/Circle Created with python_avatars Mathieu VERSLYPE says:

    Hello, Thank you very much for this video. I have the same issue but I wish relocate the usb port outside the gps. I wish sold a flex on the motherboard. Coul you help me with the pinout assignment on the usb port on the motherboard. Thank you so much.

  7. Avataaar/Circle Created with python_avatars bigpips3051 says:

    Any body have any knowledge with the Garmin Marin Multi Function Displays? I have a Garmin 7602 stuck in boot recovery loader screen. Force update doesn’t work. How could someone go about reprogramming the chip. I have a T56 programmer but I am new to PCB repair, early in my education. I’m active on some discord channels for repair but obvious these aren’t common. I’m hunting everyone for help with these as eventually repairs on these specifically is the niche I’m after perusing!

  8. Avataaar/Circle Created with python_avatars pr0xZen says:

    Garmins like a 17.3-17.4 kohm resistor across ground and the adjacent USB mini pin (pin 5 and 4 respectively). Or they'll be stuck in usb-drive connection to computer mode. Some units will take a 22kohm resistor, this will limit charge current to USB 1.1/2.0 spec (500mA).

  9. Avataaar/Circle Created with python_avatars James Duffy says:

    My garmin dezl 770 keeps dropping signal any ideas how to fix it

  10. Avataaar/Circle Created with python_avatars The2Coolest2 says:

    What's the point of those vias that don't go anywhere?

  11. Avataaar/Circle Created with python_avatars goldenultra says:

    more difficult if the gps has a tv with 2 stereo speakers: i think maybe speaker is glued to case as cannot remove motherboard. any advice would be appreciated.

  12. Avataaar/Circle Created with python_avatars R 2 says:

    You what liars do??

    They lie!!

  13. Avataaar/Circle Created with python_avatars Stan Burton says:

    Were it me, after i soldered it back and verified function, id have slathered the connection with epoxy to help stabilize the connector better.

  14. Avataaar/Circle Created with python_avatars Justin Thomas says:

    Trying to hit 5000 in January, now at 38000 in July

  15. Avataaar/Circle Created with python_avatars motazuk says:

    hehe

  16. Avataaar/Circle Created with python_avatars Liamjay choy tatoo mix🦈 says:

    good day sir,,i am a communicaton technician here in the philippines,,& i have a short knowledge how to repair furono Gp50,Gp30,31,32,,i need ur help,,i want to know how to repair garmin,for that may i recommend to our costumer to used garmin satellite,,& i willing to train you in online,,starting today i have no knowledge about garmin,but maybe if u train me,i mastering that because i am interested to know how to repair a garmin unit,thanks sir

  17. Avataaar/Circle Created with python_avatars Fez says:

    id put some hot glue around the connector for stress relief

  18. Avataaar/Circle Created with python_avatars Erik Burman says:

    Dave I'll give you $10,001 for that. Cash!

  19. Avataaar/Circle Created with python_avatars DrCyb3r says:

    Could you make a "hacking"-Video with one of those GPS devices? They run with Windows and maybe you could use them as a small touch Serial terminal. Or write own Software for it.

  20. Avataaar/Circle Created with python_avatars The Mechatronic Engineer says:

    I love these repair videos! They are very educational! You should do more of these. Cheers.

  21. Avataaar/Circle Created with python_avatars M Bak says:

    Been there, done that. SMD USB connectors are a very common failure mode for power packs and GPS units. Gone are the days of nice chassis mounted sockets bolted to a metal sheet 🙁

  22. Avataaar/Circle Created with python_avatars Hola! David Perkins says:

    Damn these type of USB connectors! They are TOO cheap to use screws to hold the bloody thing in place! A quick yank on the cord is all it takes!

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