| newn900 | i'd probaly be well off if i could remove the main memory chip and solder it onto my new device | 08:52 |
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| KotCzarny | high resistance of some pin? (ie. bad solder) | 10:13 |
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| xmn | KotCzarny would you think reheating the solders could reflow for a better connection? | 10:17 |
| KotCzarny | maybe bad solder | 15:28 |
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| Venemo | the device spent the last 6 years in a drawer, turned off, and it worked before. I don't think I did anything that affect the solder, but who knows | 15:29 |
| KotCzarny | my guesses is either bad solder or bad silicon | 15:30 |
| KotCzarny | although that doesnt help if you cant solder tiny part | 11:58 |
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| KotCzarny | that's because modem chip gets desoldered from heavy presses on keyboard | 12:03 |
| cmpxchg | I also did see a slightly oxidized tiny battery soldered on the PCB - wonder why that is not enough to power an RTC to keep time - schematics of N900 available somewhere ? | 23:56 |
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| sicelo | usb port fell out in 2015 or 16 ... so i learned a bit about smd soldering since i couldn't find a shop i could trust with it. flex cable gave out at some other point, but luckily i'd bought a brken n900 from a friend, so i got a good flex. Then TS developed an issue last year, and I also replaced it with the broken N900 too :-) | 02:46 |
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| buZz | perhaps you could just desolder the last pins aswell :D | 04:55 |
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| brolin_empey | It seems like it would be much easier inclusive-or simpler to have a computer boot from an easily removable non-volatile writable medium such as an SD card than from non-volatile memory soldered on the motherboard, such as eMMC or other forms of fixed/soldered flash memory, because then you could even use only the mobile/embedded computer itself or any other computer with an SD card reader/writer to modify the boot medium instead of having to use a USB | 09:16 |
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| Maxdamantus | Personally, I would rather the main storage be replacable without soldering. eg, I have a Kobo Clara HD, which internally just uses a microSD for its main storage. It came out of the box with an 8 GB microSD card, which you can replace if you are able to copy the image to a new card. | 09:35 |
| KotCzarny | its cheaper/faster to solder the chip than to add socket and inserting card in it | 09:45 |
| brolin_empey | enyc: The MSI K7T266 Pro2 (version 2.0?) full-size ATX motherboard in that computer is very reliable even after running for at least fifteen years since my father helped me to originally assemble the computer in early 2002. I always liked how the red solder mask looked compared to the usual green or gold. That motherboard is also old enough that it still works with both a 5.25-inch High-density and 3.5-inch High-density flexible disc drive connected to the | 11:21 |
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| xmn | I'm back on my first after my 2nd broke. Had to do some soldering on the first original one I bought too | 11:34 |
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| gillb | i tried some smt soldering with heat gun and i am very bad at this | 22:37 |
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| gillb | anyone have ideas how to connect wires to battery tabs that appear galvanized or something - solder refuses to stick | 07:14 |
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| xmn | Battery is not solder to board | 20:56 |
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| sicelo | plastic tabs probably. my SyncMaster 2033sw has them ... i'm glad i don't have capacitor issues yet, but the button assembly developed a fault. resoldering the connections (it's just switches) helped somewhat, although one of them still doesn't work reliably well | 15:03 |
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| KotCzarny | sounds like modem dying/desoldering | 11:33 |
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| brolin_empey | Which makes me wonder: in notebook computers with an internal cellular modem, is the cellular modem removable, like a Wireless LAN controller card, or is it soldered on the motherboard, like in a typical smartphone with a monolithic hardware design? | 12:23 |
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| enyc | If I'm trying to rewire (again) usb sockets onto n900's (upside-down soldered on board etc.) might i mbe better getting usb-C or something other than usb-micro anyhow? | 13:49 |
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| enyc | looks like a potential pain to solder however | 13:53 |
| xmn | I just saved my last one of two. Had to do some soldering. But was missing it very much while I was using a dumb phone. | 22:20 |
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| brolin_empey | Core 2 ULV CPUs are only available soldered on a motherboard. Notebook computers use a socketed Core 2 CPU but use a different socket than desktop motherboards and no adapter/converter is available as far as I can tell so I cannot use a ULV nor mobile Core 2 CPU on a desktop motherboard. | 05:40 |
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| brolin_empey | sixwheeledbeast: I redd https://www.gpd.hk/gpdp2max . It is indeed interesting but it has a fan, lacks an integrated numeric keypad, and presumably requires disassembly to access the battery. Also, it looks like the main memory may be fixed (soldered) on the motherboard instead of socketed? The IPS AMLCD sounds nice but an AMOLED display would be more impressive. | 05:04 |
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| brolin_empey | sixwheeledbeast: OK. The soldered main memory sucks if the memory develops a bad bit, especially because it is non-ECC RAM as far as I can tell because I have not seen any mention of ECC RAM. | 11:01 |
| sixwheeledbeast | I wouldn't be expecting many laptops/foobooks to have ECC most tablets would be soldered | 14:39 |
| hmw_metalab | My _previous_ one refuses to charge. I inspected the USB port with a microscope and the solder looks fine. :( | 08:21 |
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| Wikiwide | Of course, this device doesn't include a speaker. It merely includes ten solder pads which may allow to solder on a speaker, for mono audio sound. Currently it's just a video monitor - not sure what its native resolution is, but it accepts N900 image just fine, albeit blurry. | 03:36 |
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| KotCzarny | there is a chance you dont need any soldering | 21:09 |
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| * timeless is definitely not doing soldering | 21:09 | |
| sixwheeledbeast | Yours is a RBC43 by the way. As I say there is no soldering you may need a screwdriver at the worst. 10 minutes. | 21:12 |
| brolin_empey | Unless a feature phone is designed to be so low cost that the battery is soldered instead of using a connector, which I think I saw done on a very low cost feature phone from Asia. | 15:49 |
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| buZz | brolin_empey: the cpu is soldered on | 22:03 |
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| KotCzarny | or resoldering | 20:04 |
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| sunshavi | kotczarny: too bad for me. Do You have a video o resoldering? | 20:05 |
| sixwheeledbeast | reballing more than resoldering | 21:39 |
| brolin_empey | I tried to answer my own question about using a Core 2 Duo ULV CPU on a Socket T/LGA775 motherboard. I found my own messages from this channel while searching the Internet. Apparently the Core 2 Duo ULV SU9xxx CPU, which has a TDP of only 10 W and is what was in the Dell Vostro V13 notebook computer I had, is indeed soldered on the motherboard instead of socketed. Apparently some medium-voltage Core 2 CPUs use Socket P but I do not yet know if a Socket P | 23:48 |
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| DocScrutinizer05 | for soldering: first plate the PCB pads and the component pins' downsides with a moderately thin layer of solder, add high quality no-clean SMD flux, then place component on PCB and reflow-solder with quite hot soldering iron (I suggest >400°C) first the smaller pin, then the larger, by pressing soldering iron tip wetted with some solder on top of the component pin metal area | 13:43 |
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| DocScrutinizer05 | it's a tad counter-intuitive but the hotter the soldering iron, the less risk to overheat the component on reflow to mount to PCB | 13:46 |
| brolin_empey | It seems that usually the low-power (as in electric power, not capability) 80686 or x86-64 CPUs are BGA ICs or some other package meant to be soldered on an embedded motherboard, not a socketed package meant for use on a desktop motherboard. Note that “embedded motherboard” can include a notebook computer in this context. | 12:35 |
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| brolin_empey | Is it possible to use a Core 2 ULV CPU on a desktop motherboard with a socket for the CPU? I used to have a Core 2 ULV notebook computer (a Dell Vostro V13) but I think the CPU was soldered, not socketed. | 12:45 |
| brolin_empey | I guess it could be possible if you could make a board to adapt the soldered package of the CPU, probably a BGA IC, to the socket of the desktop motherboard. | 12:47 |
| Wikiwide | Why cannot a device have only memory cards, instead of solder-on memory chips? | 13:55 |
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| Maxdamantus | So not the ones with the large tabs for soldering onto and the male thread for a cover. | 12:22 |
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| Maxdamantus | just wondering about where to get ones where the part you solder the wires onto is lower-profile. | 12:25 |
| Maxdamantus | Enrico_Menotti: I intend to just put epoxy over the solder joints, so don't need an entire case thing. | 12:48 |
| KotCzarny | maxd: why? you would be stressing soldered part otherwise | 13:15 |
| Maxdamantus | KotCzarny: in my design above the solder joints are not stressed, since it's all under epoxy. | 13:15 |
| Maxdamantus | and as for "why?", I'm pretty sure the fault is never with the solder joint. | 13:22 |
| Maxdamantus | the solder joints are usually encased in plastic anyway, similar to how they're encased in epoxy on my one. | 13:23 |
| DocScrutinizer05 | this either means the interface got disconnected (nroken solder joint), or - more likely -the modem went into shut down state for whatever reason, in an unexpected way that the fremantle "drivers" didn't notice | 08:36 |
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| Vajb | DocScrutinizer05: I suspect solder join. Because I have noticed that temperature affects it. | 08:40 |
| brolin_empey | “USB bus”, heh. QFN ICs have a reputation of causing soldering problems in production. | 05:35 |
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| spinal_ | i still thinking how to connect all terminals without soldering :p | 20:43 |
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| spinal_ | so, i only can use soldering, no other options | 20:49 |
| DocScrutinizer05 | you ruin your device by soldering battery contacts | 20:49 |
| spinal_ | i need a way to connect to battery terminals without soldering and short circuit... | 20:58 |
| sicelo | 20:58 < spinal_> i need a way to connect to battery terminals without soldering and short circuit... << http://n900.elektranox.org/serial-adapter.html .. one neat way by Sebastian reichel | 23:29 |
| {-0-} | Hi all! USB socket repair... trawling through the big thread on the forum but it seems a lot of the pictures are missing. Am I correct in thinking that the 5 tiny pads at the back and the 4 medium pads round the outside are all soldered but the 2 big squares underneath are glued? | 16:23 |
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| sicelo | iirc, originally only the 5 tiny ones are soldered | 16:37 |
| sicelo | but you probably should solder everything :-) | 16:38 |
| {-0-} | amazing to watch that guy soldering when it's all zoomed in! | 20:57 |
| * sparre has to learn how to solder modern electronics. | 12:48 | |
| * sparre hasn't done any serious soldering since he worked on a nuclear reactor. | 12:48 | |
| KotCzarny | i assume soldering in nuclear reactor is easier than dabbling with smd | 12:49 |
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| brolin_empey | Some models of notebook computers, including an Asus model my colleague has, have the main memory soldered on the motherboard. I believe the Asus model is Asus X200MA-US01T. | 03:34 |
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| Hurrian | oh yeah, you have to check first if the preinstalled "DIMM" is actually soldered on the motherboard | 03:39 |
| Hurrian | some laptops from that era have the main DIMM soldered, plus one expansion slot | 03:39 |
| brolin_empey | Hurrian: I meant main memory in the computer architecture sense, not in the computer hardware design sense, i.e., the Asus notebook computer uses DRAM ICs soldered on the motherboard instead of using a (SO)DIMM socket. | 04:44 |
| Hurrian | yeah, newer laptops have all the RAM soldered in | 04:44 |
| Hurrian | but some laptops from a few years ago have preinstalled soldered RAM, plus one expansion slot | 04:44 |
| brolin_empey | “but some laptops from a few years ago have preinstalled soldered RAM, plus one expansion slot” | 04:51 |
| brolin_empey | Hurrian: It is the notebook computer of my father, not of me. I use only desktop and handheld computers, not something in between. Can I tell from the software if the CPU is socketed? Maybe from the package type? I guess if it is some form of BGA then it is soldered on their motherboard but if it is some form of PGA or LGA then it may be socketed? Does the motherboard firmware have to support the CPU released after the model of computer was released? | 05:22 |
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| Hurrian | IIRC you can't check the package type of the installed CPU from software, as socketed/soldered doesn't really make a difference to the software | 06:37 |
| Hurrian | couldnt remember the exact model, but it was an Asus with 4 DIMM slots, yellow soldermask on PCB | 09:25 |
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| Maxdamantus | (if you're able to open it, you could probably just solder the pins together, or tape some aluminium foil over them if you aren't able to solder) | 08:19 |
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| DocScrutinizer05 | Shapeshifter: sorry, I don't. I use separate 15bucks desolder pump | 06:14 |
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| DocScrutinizer05 | usually it simplifies stuff a great deal when you cut the component to remove into pieces, so you can pull one pin at a tme with a pair of tweezers or pliers while heating the solder of that one pin | 06:17 |
| DocScrutinizer05 | unsoldering even a 3pin mouse button switch drives me mad without cutting the switch into pieces beforehand | 06:19 |
| DocScrutinizer05 | for large heavy components you can trun the PCB component side down so components can fall out, the apply a torch to solder side of PCB to reflow large areas very quickly | 06:22 |
| Shapeshifter | DocScrutinizer05: I managed to desolder all 64 switches using the solder sucker... What an ordeal. First I tried to remove the solder from all switches (which are also held in place by a base plate) to remove the base plate, including switches from the PCB but there was no chance in hell that would have worked, because the slightest drop of solder holding a pin in place was enough to make this fail. I | 17:33 |
| Shapeshifter | got really mad and gave up, re-soldered all the switches and wanted to call it a day. I cleaned the PCB using KONTAKT and reassembled the keyboard but then discovered that since I had used so much solder trying to re-solder and re-suck the solder that some of the cleaning fluid, including sticky flux had gone into some of the switches, which were now sticking in the down position.... So I had dinner, | 17:33 |
| Shapeshifter | took a hot bath, calmed down and went at it one more time, this time de-soldering one switch at a time, pulling it from the base plate - repeat. Took me close to 2 hours but I got the hang of it in the end. It's not that hard. It just takes a lot of concentration applying heat just long enough and really sticking that sucker down firmly on the pin... Still a huge pain. A de-soldering tool would be | 17:33 |
| Shapeshifter | DocScrutinizer05: by the way, I once used a 5 buck solder pump and it was abysmal. Now this one I used cost more like 25 but it's /okay/. Engineer SS-02 | 18:19 |
| Shapeshifter | DocScrutinizer51: I just spent like 3 hours trying to desolder keyboard switches from the PCB and I'm going fucking mental... It's doable with a solder sucker buy jesus fucking christ it's maddening. So I want to buy a desoldering station, a real one, with a pump. Do you have a recommendation? | 19:13 |
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| Juesto | Wikiwide: Solder it? | 06:45 |
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| Shapeshifter | DocScrutinizer51: Hey doc ^^ I broke my soldering station (fixpoint ap2, cheap thing). What would you recommend as a replacement? I guess I'd pay up to 150€ if it makes sense. maybe more if it really, really is worth it. | 12:59 |
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| Shapeshifter | Kinda annoying though that I have 4 new tips for this el cheapo soldering station -.- | 13:30 |
| DocScrutinizer05 | tbh I never had a "aircon" for soldering | 13:39 |
| DocScrutinizer05 | depends on the number of solder points you got to make per day | 13:40 |
| CatButts | I took cable from defunct original charger and soldered a barell connector on the other end to plug charger | 18:06 |
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| CatButts | [21:44] <shibiZdn> Figure 2.2 shows variation of tensile strength for solder thickness in a | 21:45 |
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| CatButts | [21:44] <shibiZdn> that of bulk solder (3.5 kgf mm-2), also shown on the graph for reference | 21:45 |
| Wikiwide | /me objects to "solder a wire to PCB" on principle. Have seen it torn out way too many times, painful to connect back. Better to have some kind of reusable connection. | 21:48 |
| varu | n900 shenanigans on my end are put on hold until i get around to properly soldering that usb port back on.. the job i did didn't hold, need better tools or a better approach | 23:21 |
| Wikiwide | Remember http://imgbin.ca/image.uploads/06-12-2017/original-152c5395e0cf4016861191e87bc20382.jpg ? The black wire detached its soldered end from green PCB, delayered it, wavers up and down, making the circuit extremely unreliable (working only when ants are patiently pushing it to connect). | 12:47 |
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| Wikiwide | I soldered a wire to connect this pin to the rest of the circuit, replacing a thin bridge-trace on the PCB with yet another wire. In process, more damage was incurred: one of the two thick wires connecting LEDs to PCB came detached. In attempt to solder it back onto PCB, the two black wires became soldered to each other. | 12:49 |
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