souder sur une carte électronique - Page 1
Forum section: electronics / repair

author: mariefav
author_rank: Newbie
timestamp: December 30, 2022, 10:51:04 am
content: Bonjour,en photo jointe j'ai une carte électronqiue de ma machine à laver. Il y a une soudure cassée je l'ai entourée en noir. J'hésite à reprendre la soudure car l'espace est pas grand j'ai peur de déborder sur les autres contacts. J'ai acheté une carte neuve en pièce détachée chezhttps://pcdt.fr/lave-linge/ils sont ok pour me la reprendre si je l'ai pas déballée donc c'est super cool. L'enjeu c'est de la renvoyer et donc de réussir ma soudure.ma question est-ce que si je bave un peu ma soudure sur le contact voisin ça va poser problème ? C'est le bouton on/off de la machine à laver quand même je veux pas que ça foute le bazard.merci de vos retours

author: coromonadalix
author_rank: Super Contributor
timestamp: December 30, 2022, 11:23:22 am
content: Cest un forum en AnglaisIt's an English forumMercithks

author: Ian.M
author_rank: Super Contributor
timestamp: December 30, 2022, 12:03:58 pm
content: OTOH Chromium's Google translate works well here, for me, it detected a page in French and auto translated it, so lets see what we can do to help. For those who have problems auto-translating forum content here:Quote from: mariefav (translated) on December 30, 2022, 10:51:04 amIf you have suitable tools available, and the correct type of flux and solder,and there is no other fault, (see Grumpydoc's comments below)you can certainly fix it. Tell us what soldering tools you have or can borrow. It would help if you can find some scrap PCBs to practice on, removing and replacing parts then confirming that the re-made connections are good using a DMM (digital multimeter) in continuity test mode.You will almost certainly needdesolder braid(also known as 'solder wick') to remove the solder from the failed joint so you can inspect it for a broken track or lifted pad on the PCB. It can also be used to clean up any solder blobs that get where they shouldn't. Chemtronics is a good reliable brand - there are others that are good but most of the Chinese brands on Ebay or Amazon are far less effective or even useless!If the pad is still firmly attached to the PCB and not broken from its track, you only have to resolder it. Otherwise you may need a patch wire between the switch pin and the nearest part of its track that is still intact and firmly attached to the PCB to reconnect it. If the distance is short and it doesn't need to cross any other tracks or pads, you can use bare tinned copper wire (solid, not stranded), preferably with diameter a bit less than the pin thickness. If the distance is greater or it has to cross other tracks or pads, you must use an insulated patch wire, or put insulation under it. Kynar insulated wirewrap wire (30 AWG silver plated copper solid core) is the easiest to work with, but you could use any small diameter insulated solid core hook-up wire or even for fairly short distances, bare tinned copper wire with Kapton tape insulation under it so it doesn't short-circuit any other pad or track it crosses. If it is going to a track rather than an existing solder pad, you'll need to scrape off the green solder resist to expose bare copper, clean it with an abrasive glass fibre pencil brush, and pre-tin it with solder before you attempt to solder the patch wire to it.If the pad has lifted, after soldering the patch wire to the pin and pad, and cleaning the flux off the board with a toothbrush and flux remover or denatured alcohol (Alcool À Brûler Auchan is suitable), taking care to use enough to wash all the dissolved flux off the edge of the board, and letting the board dry completely, you can glue it back down by applying a drop of thin cyanoacrylate superglue at the edge of the pad, then pressing it down (and holding it) to the board with a small jeweller's screwdriver or similar tool till the glue sets. Do not glue the pad before soldering as the fumes from hot cyanoacrylate are noxious and toxic. If the pad is completely detached, it may be preferable not to replace it, but just solder a stiff patch wire to the pin and nearby track it broke off from, then glue under the switch body to reinforce it following the full procedure as described for gluing a lifted pad.N.B. look closely at how the PCB fits to the front panel - there may be plastic supports that must touch the board near the switch that will affect how you route patch wires.However, if the board is very high value and there is still a shop that does any sort of electronic repairs in a town near you, you may prefer to pay a professional technician to make the repair for you. Any shop that still repairs TVs and other home entertainment electronics should be able to do the repair well, and some larger independent mobile phone repair shops who do PCB repairs could also do it, but show them the fault on the board and ask their price before agreeing to the work.They will probably say "We can re-solder the connection but there is no guarantee." as they cannot test the whole board.Edit: See Grumpydoc's comments below

author: grumpydoc
author_rank: Super Contributor
timestamp: December 30, 2022, 12:50:47 pm
content: Hello mariefav, welcome to EEVblog.The photo is not very clear, I presume that you have fund a dry joint on the push button in the area outlined in black.However I'm rather more worried about the SO16 IC (outlined in red) which seems to have migrated from its pads.You can repair that with basic soldering tools, but if it has overheated enough to melt the solder there might be another fault present.Bonjour mariefav, bienvenue au EEVblogComme des autres ont déjà dit EEVblog est un site anglophone.La photo n'est pas très nette, je présume que vous avez trouvé une soudure froide sur le bouton poussoir dans la zone délimitée en noir.Cependant, je suis plutôt plus inquiet pour le CI SO16 (encadré en rouge) qui semble avoir migré de ses plots de soudure.Vous pouvez réparer cela avec des outils de soudure de base, mais s'il a suffisamment surchauffé pour faire fondre la soudure, il peut y avoir un autre défaut.

author: BILLPOD
author_rank: Frequent Contributor
timestamp: December 30, 2022, 08:27:06 pm
content: no lo comprende

author: grumpydoc
author_rank: Super Contributor
timestamp: December 30, 2022, 09:03:05 pm
content: Quote from: BILLPOD on December 30, 2022, 08:27:06 pmYou don't have to understand French - Ian.M provided a (machine) translation of the original query which is easy enough to follow, especially if you realise that "weld" and "solder" are basically the same word in French (souder) and we're talking about soldering here. mariefav thinks that the problem is a dry joint on the power switch, I have a feeling it might be more to do with the fact that one of the SO16 chips seems to have desoldered itself and gone for a wander across the board.My answer was the same text in English and French - the latter out of politeness, but we have pointed out that EEVblog is an English speaking forum - maybe that's why mariefav has not been back - though worries about language skills are not the blocker that they once were given excellent, free, online translation tools. I recommendDeeplwhich is generally better than Google (but the latter is pretty good these days as well).

author: grumpydoc
author_rank: Super Contributor
timestamp: December 30, 2022, 09:14:02 pm
content: OK, well, that's interesting.The photo is a still from this YouTube video,https://youtu.be/LqYZ-y7_fhw- so, really I haven't a clue WTF is going on or what the motivation for the original post was. The reason the IC is halfway across the board is that it's just been dropped there and is about to be soldered in place.I don't know if the original query is genuine, for now I'm leaning towards the notion that it wasn't, especially as the OP hasn't rejoined the conversation in either English or Frenchmariefav - if you would like to provide photos of your own PCB, and give us some more details of your fault, please do so.

author: Ian.M
author_rank: Super Contributor
timestamp: December 30, 2022, 09:43:42 pm
content: Good point. I've alerted our moderators and deactivated the link in my translated quote in case they determine its spam. I hope I'm wrong and Mariefav turns out to be genuine.

author: grumpydoc
author_rank: Super Contributor
timestamp: December 30, 2022, 10:00:33 pm
content: Quote from: Ian.M on December 30, 2022, 09:43:42 pmLikewise, even if not it might be no more than a crude attempt to advertise a site selling spare parts for white goods - though there are aspects of the site which would put me off such as no clear company details and lack of a SIRET/SIREN (French company registration numbers).But at the moment my 6th sense is tingling.

author: Swake
author_rank: Frequent Contributor
timestamp: December 31, 2022, 07:38:26 pm
content: Joining the opinion that this is indeed SPAM/advertisement. The same website is referred in the profile of OP.Having no experience with them I can't judge that site, nor the company. There are company details and registration numbers on the site though.My suggestion to the mods is to at least remove the links/names.

author: shakalnokturn
author_rank: Super Contributor
timestamp: December 31, 2022, 11:18:47 pm
content: Either someone technically illiterate or apost... In either case I don't see this getting anywhere.

author: grumpydoc
author_rank: Super Contributor
timestamp: January 01, 2023, 12:18:44 pm
content: Quote from: Swake on December 31, 2022, 07:38:26 pmAgree, it's been reported by Ian.M and myself. Hopefully anyone coming across the original post will see the whole thread - it's not long - and be warned off.

author: mariefav
author_rank: Newbie
timestamp: January 02, 2023, 08:10:21 pm
content: Bonjour, merci beaucoup de vos conseils. J'ai fais la soudure avec mon chéri mais en effet ça ne devait pas être le problème. En plus on a un peu trouée la carte. Bref on a monté la neuve et là c'est cool ça remarche.Thank you guys for your answers. My boyfriend and I tried to proceed with the solder but the card has been deteriarated (a hole due to the worm) Finaly we decided to put the brand new card and it works from now. Thank you so much again to all of you

author: Ian.M
author_rank: Super Contributor
timestamp: January 02, 2023, 08:20:15 pm
content: @mariefav,If you are not a spammer, please delete the URL link from your original post above. Thank you.Si vous n'êtes pas un spammeur, veuillez supprimer le lien URL de votre message original ci-dessus. Merci.