My LG 37lc2d recently blew a capacitor, since I've never soldered on a board I asked a friend of mine to do it. He tried to remove the old cap today with no luck. He said he turned ths iron all the way up to 700 degrees and it wouldnt melt the solder on the board. Anybody have any suggestions?
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Re: new guy with some questions
sounds like he either didn't tin the tip, his tip wasn't a chisel (instead was a thin needle tip), or it is a low wattage iron.
changing the title to match the subject.sigpic
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Re: Cap Removal Issues
The surface where the wire of the capacitor comes through the board can be so small, the tip of the solder gun can't make proper contact with the copper pad and the capacitor wire, so the area never heats up to the point where the solder becomes liquid.
In such cases, the solution is to just melt some solder on the tip of the gun and make contact between the gun and that wire so that the extra blob of solder will transfer the heat.
Add some solder to the other pin of the capacitor, then alternate between heating each solder blobs while wiggling the capacitor with your fingers or a tool.
Stainless steel needles also help, to clear the hole after removing the capacitor.
Solder on boards is usually the kind that only melts at about 235c, so the gun needs to heat up to about 300c. If you add regular solder with lead, this solder turns liquid at about 180c, so it helps adding a bit.Comment
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Re: Cap Removal Issues
Thanks for the quick replies. I'll let him know.Comment
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I have a Lenovo IdeaPad Gaming 3 15ACH, which has started exhibiting the well-known issues of the Lenovo IdeaPad 3.
All stress tests run perfectly, and there are no performance issues. However, the solder joints are almost certainly starting to fail. If the top two screws on the back are not screwed in, moving the screen results in a BSOD or, in some cases, a slight artifact and freeze. This is a 2023 notebook..
How can I extend its lifespan? Could reflow help?
It has ryzen 5 5500h, rtx 2050, no soldered ram.
Example of the artifacts:
...03-01-2025, 11:11 AM -
This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.
There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as... -
Hello, I'm a beginner for micro soldering. Right now I have some difficult to solder a qfn 20, I guess I put too much solder on the thermal-ground pad, the result is a corner of chip wich don't touch the board (last try).
I use a wire solder with hot air, I tin the board and chip before with iron and I use good flux.
I will have to solder a LVDS connector (40 pins, laptop pc), I saw a solder paste in seringe, good quality (it does not scatter).
See the test :
https://youtu.be/bNAzC-EvqHs?t=1767
With hot air from bellow the board, that's... -
Can someone recommend any good UV solder mask? But i need a solder mask that will stand high temperetures. The thing is...sometimes i have a bigger cooper ripped from the board, lets say mosfet pad... i reconstract it with cooper sheet, then i "glue it" with solder mask...then i use UV light...and let it cool a bit. After, i try to clean the cooper of extra solder mask..and till that part all is ok. But, when i use a soldering iron to solder that pad/cooper...the solder mask gets weaker or destroyed and finally the pad is ripped again from the board .
Is there any solder mask... -
So I though in my spare time I’d set myself up repairing motherboards mainly pin damaged lga1151 sockets types.
I’m using an achi ir sc pro rework station (gave up on my Achie ir6500 - don’t recommend)
I’ve managed to get my rework profile somewhere in the correct region (after a lot of trial and error) to get the old sockets off and reflow new ones back on again, the problems I’m getting is not all of the solder balls are re-attaching when re-flow occurs. I know this because when socket is removed pads still look clean and have no solder...
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