Why are your videos *so* interesting? I've never thought that I will enjoy looking at someone soldering some chip balls, yet I find it intriguing. Is it because you mix humor, life advice and explaining things in perfect proportion? PS: I don't expect Louis to reply.
So PPV54 and LMNOP42 are both screwed so we need to check OU812. What we need to do is desolder pin 69 and find its square root (8 something). And THIS is why it's do damn interesting......
Thanks so much dear Louis Rossmann for this online classes. You really teaching very well. We really love you so much and we're looking for enough resources. 💐🏭
I watch your uploads frequently and I still can't get over the optics of the stereoscope. Our POV is excellent. I work on various modules and PCB's associated with Aerial Photog /Drones. I would be in heaven seven to have this kind of visual.
So i know this is one idea you might not want to do Louis .. But I'd love to see a video of the top 10 or top 20 components to always make sure to keep in stock along with the reason to have X component that you may not wanna get from donor boards, complete with enough data on each component so anyone can order from say mauser.. It'd be great for people who's starting in on this field
Em.. not sure about this but did you replace a polyfuse with a 0 ohm resistor? (0 was written in there).. Also polyfuse reverts to the working state after current drops to reasonable levels - self resets (based on fuse specs), so no wonder that the polyfuse almost newer blows... or am i wrong?
Louis question if you get time for it, where is the wire attached too besides the blown pad? Isn't it suppose to be connecting to another part of the board, a different pad? Let me know I'm curious. Or is it used just to connect the pad to the ball in such a way that there needs to be the wire there to form the connection?
Great video! But why do you choose the NC-559-V2-TF Tacky Flux over the VS-213-A-TF ? Amtech's web site says that the NC-559-V2-TF needs to be completely cleaned away to avoid contamination, capacitive effects and possible corrosion, over time (but still names it "No-Clean"!). Also, the NC-559-V2-TF is listed as: "won’t solder lead-free metals". Isn't all solder tinn sold today, lead free (Environmental requirements) ? My task is to heat up a GPU in order to re-seat the chip hoping to mend cracked or broken solder balls underneath it, without actually removing the chip. I have been told that this may fix a malfunctioning GPU, as they tend to elevate from the PCB if overheated during operation, possibly causing some odd balls to crack and loose contact. Then, by applying plenty of flux, melting it and letting it flow in underneath the chip, is said to be a useful method that may fix such problems. But of course, since the chip isn't removed, cleaning away remaining flux underneath it, is impossible. Comments?
Hey Louis I love your videos, you may have answered this in a previous video but I have not watched all of them. Would you consider doing videos on fixing other products? I would love to see you fix a drone for example, they are becoming increasingly relevant nowadays and nobody on RU-vid is doing component level repair. And televisions? My TV has a screech going on. Anyways I thought I would ask. I absolutely love your channel!
TVs cost $299 at best buy so people expect me to fix them for $49. even worse they want me to come to their house, fix it on the spot, all for $49. so I will never fix a television. in terms of drones, if demand were high enough and people were willing to pay sure..
Hi. I have been watching many of your videos. It surprises me that you heat the chips (from the top) for a relative long time with your hot air soldering tool. Isn't there a risk of overheating them? I just ordered a hot air soldering tool, and I am going to practice on some old boards first, to get used to this soldering technique. Also: some chips require a thermal pad. Are the chips in this case soldered to the thermal pad, or do they use thermal conductive grease most of the time?
That is how the chips are designed to be used. BGA chips are made with balls of solder already on them, although Louis is reusing parts, so he makes do with creating his own with solder on the board's pads instead. Other components don't have solder balls when new - with these, a solder paste - microscopic balls of solder suspended in flux gel - is put on the pads and the components placed on top. Then the whole board is put through an oven which heats everything up to the solder's melting point. Louis doesn't use paste, he just melts fresh solder onto the pads, adds more flux, and heats. Parts with thermal pads under them just have either solder paste or balls underneath the pad, and it is soldered to be board in an oven. If hand soldering them, you just need to get everything to the right temp.
I can explain. That pin holds a high voltage, so, when this board got wet, electrolysis ate the copper pad away from under that ball of solder. In order to get the board working, he had to replace the missing pad. So he soldered a wire from a nearby point to where the pad was, and allowed it to solder to the pad on the new chip.
Sir good iam romany from egypt ihave mini pcb pc board it bent foroced during i remove it and the boared stop workenig the cpu pga soldring directly on board the side of board was bent may some bga balls are dis connected kindly i need your advice what can i do to resoldring the dis conncted balls please help me
+Louis Rossmann Thank you. You're the shit. I saw the video where you explained how you helped the girl move out into a hotel and get her dad arrested and she killed herself. You are a good, hard working, humble person and you deserve all the success you have.
You never showed the schematic and why that pad blew as you told in the beginning :p nice job though! It always looks so damn easy under a microscope haha.
He will not, because it is to much pain in the ass with the customers. They phoned him 5x per day and wrote like 10 mails per day only to ask if the phone is repaired. People can live nowadays without a laptop but not without a phone. He mention once his experience with this in one of his videos.
Check out a channel called iPad Rehab, Jessa has some iPhone and iPad component repair videos there, basically the same stuff what Louis does, but with iPhones.
LOL what if the Bad BGA pad is in the middle ? drill a hole under the motherboard with the wire already welded to the chip ? im not making fun of you but just thinking of a solution.
most motherboards use many layers of traces inside a single pcb- there might be something in the middle of the board you're drilling through or shorting
You could mill out the layer(s) of fibreglass and reinstate the via and pad, along with substrate.. there's just no way it's economical to do for a Macbook. You lose a non-edge pad on a fine pitch BGA, you scrap the board. Some of the really low density BGAs you could possibly run a very fine wire to if you can locate the net somewhere accessible.
Harry Haefner Yes. And it always behaves like an intact fuse. Well, bit like tinfoil wrapped around the fusebox... But anyway the christmastree lights again.
I use flux everyday to brush my teeth, never use too much and they'll always shine. Trust me, I'm an engineer P.S: More than salty it's kinda bittersweet, like a sarcastic joke ;P
