BGA rework lifted traces on board... Help? - Page 1
Forum section: electronics / repair

author: BAM5
author_rank: Contributor
timestamp: January 20, 2016, 06:00:57 am
content: Long time watcher, n-th time save my ass post.So I got this laptop from a friend, a hp DV6-3050us, better than anything I have. Graphics chip was causing troubles (apparently a common problem). "Reflow"ing it helped a few times, but was never permanent. So I decided to reball it. Stupid thing though, the manufacturer put bits of epoxy under it on the corners. When I picked up the chip off the board it appears I may have picked up a few traces/pads with itCould someone please give me hope? I'd prefer not to have to buy a new mobo for this. Are there ways to repair pads? Perhaps the vias just have some gunk in them I can scrape with a pin and get solder back up to the top? Perhaps many bga chips have redundant pads? Perhaps all pads weren't used? GaaaaaaaLet me know of any solutions or ideas you may have. I'm pretty stubborn, so just giving up isn't a valid option to suggestSympathy/"I fucked up my board too, don't worry about it" posts are welcome

author: alsetalokin4017
author_rank: Super Contributor
timestamp: January 20, 2016, 06:25:11 am
content: Sounds like you need to watch a bunch of Louis Rossmann's videos.

author: BAM5
author_rank: Contributor
timestamp: January 20, 2016, 06:30:03 am
content: Louis Rossmann. On it.1 minute into his channel trailer and I've already found myself subscribed!

author: BAM5
author_rank: Contributor
timestamp: January 20, 2016, 06:35:26 am
content: Nudging didn't work because of aforementioned epoxy :< Damn manufacturers! I probably should have gotten a pin and got in there to clean out the epoxy :/Too late now!

author: BAM5
author_rank: Contributor
timestamp: January 20, 2016, 07:38:59 am
content: alsetalokin4017 do you know of any specific videos of Rossmann's that go into bga repair? He has a lot of vids that are like 40 minutes :S

author: wblock
author_rank: Regular Contributor
timestamp: January 20, 2016, 08:09:10 pm
content: Quote from: alsetalokin4017 on January 20, 2016, 06:25:11 amWasn't the problem with those GPUs inside the chip? So maybe:.There have been recalls on many HP DV notebooks with defective GPUs.

author: BAM5
author_rank: Contributor
timestamp: January 20, 2016, 09:22:14 pm
content: Actually just watched that vid last night. Wasn't aware of that. Probably still would've tried anyway though

author: flolic
author_rank: Frequent Contributor
timestamp: January 20, 2016, 09:44:40 pm
content: Quote from: blueskull on January 20, 2016, 06:38:10 amThe usual red epoxy under BGA corners softens when you preheat PCB to cca. 140-150C.It can then easily be scraped off with suitable tool. I use wooden toothpick thinned so that can fit between BGA package and PCB.I removed (too) many glued BGAs without problem...Do not use metal tool, it will damage something.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: January 21, 2016, 01:13:57 am
content: Well, the problem seems to be how to fix what you've got now. It's nice to know how to avoid creating the problem in the future, but it's too late for that in the present case.The only way I can think of is to fabricate and install some kind of pad-substitute. You could try carefully cutting out bits of copper foil and gluing and soldering them in place on the PCB, perhaps using fine magnet wire to bodge in the necessary connections. It might be possible to drill through the PCB in the location of the missing pads, depending on what's in the middle layers or on the other side.Can you post a photo of the damaged BGA pad area on the PCB?

author: BAM5
author_rank: Contributor
timestamp: January 21, 2016, 02:07:58 am
content: Ok, so the type of glue I had was the corner stuff, and I did heat it up and scrape as much off of the outside corner as I could with some tweezers, but I didn't get the stuff under the board.Yes alsetalokin4017, I agree, a solution to my current problem would be nice, but I'm starting to lose hope on this thing. My new phone's camera sucks. I'll grab my old phone and a lens out of a laser pointer. I'll have some photos tomorrow.Repairing this is going to be pretty tricky as these pads are pretty tiny. I'd need some extremely thin magnet wire. I think I counted like, 8 damaged padsAs long as someone says it can be done though, I'm going to try.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: January 21, 2016, 01:58:44 pm
content: 8 damaged pads....That is going to be tough. First though let's see if you can _carefully_ clean off the pads as Louis shows in this video (not a graphic chip, but the principle is the same):This should allow you to see clearly how bad the pads are. But if there are really 8 bad ones, and they aren't at the edges of the array.... well, just about anything can be fixed if you are willing to spend the time and effort and have the right tools. Brain surgery might be easier though....

author: Rasz
author_rank: Super Contributor
timestamp: January 21, 2016, 05:34:32 pm
content: Quote from: BAM5 on January 20, 2016, 06:00:57 amin to recycle bin we go"reballing" is a fraud, voodoo magic to F clients in the A by scammy technicians.You would need a real brand new GPU from a fixed batch, those are either >$100-200 or/and fake from chinese dumpsters with fake markings