The amount in this video, is low risk. It's not really too close to other components. It really depends on how much copper is exposed, and where. If it is a big chunk of copper exposed, between two or more pads/component ends/legs, that do *not* all connect to the same line (for example ground) - then it is more risk. If that happens, you need to consider repairing with new solder mask or similar, to, prevent a possible short. Especially if it's under a chip, because you cannot see if a solder bridge is formed when soldering the chip back on. Just make sure the amount used is extremely thin, so it has a lower height than the solder balls. It *MUST* have lower height than the solder balls, or the chip will not sit down and the solder balls will not connect properly in that spot. You must not push down on the chip to overcome this error, that will spread the solderballs too wide and cause shorts between pads. A solder mask repair under a chip is not for mechanical protection, nothing can touch it once the chip is back on. It's only to prevent solder from contacting that exposed bit. If it happens between two pads that both connect to the same line, for example ground, then it's low risk because those pads are effectively shorted together already by design.
@@HcqsUs No I mean micro cnc destructive removal of the chip. I've been having a terrible time trying to find any useful videos of removing underfilled chips, that are _not_ using s cnc router to physically grind the chip away. Found a couple on removing underfill once the chip is off, but not on the actual chip removal itself. I'm not sure how to do this, so my trial and error attempts have all ended up terribly destructive to both the chip itself and surrounding components.
Thin absorbant cleanroom wipes. By putting the wipe on top like this, you get several benefits. You don't scrape the brush directly on pads, so it is a little more gentle on the pads, original solder mask and smallest components. You soak up much of the old flux at the same time as wiping, so if you don't use excessive amounts of flux cleaner or IPA, you have some level of control where remnants of thinned out flux go, and less flux is absorbed into your brush or q-tips. You don't need to rinse the whole board afterwards as much. It's less mess to clean up, you can just throw away the disposable towel. Your brush does not wear out as quickly.
Another superb demo.clear and concise.keep up the great work folks.
Thank you very much Stephen, will definitely keep up :)
Professional of the kind.
Thank you very much!
excellent video...Highly professional
It's very nice clean Work, fast and precision 👍👍👍👍.
Nice video! Where can I get that power supply wire to connect to the phone?
Excellent and perfect video, please what's the temperature for soldering back again the IC you didn't specify and also airflow.
Hi there, what is the name of the flux are you used? Thnx
Hi, Martin, thank you for your comment, you can check the solder flux on our webshop : www.hcqs.eu
@@HcqsUs can you tell please temperature for soldering back and airflow
great. can u post video power management ic reballing replacing technics
Hi, thank you for your comment, will do
Thank you sir
With the nicks and scratches exposing the copper in the board will the surrounding components be fine?
The amount in this video, is low risk. It's not really too close to other components. It really depends on how much copper is exposed, and where. If it is a big chunk of copper exposed, between two or more pads/component ends/legs, that do *not* all connect to the same line (for example ground) - then it is more risk. If that happens, you need to consider repairing with new solder mask or similar, to, prevent a possible short. Especially if it's under a chip, because you cannot see if a solder bridge is formed when soldering the chip back on. Just make sure the amount used is extremely thin, so it has a lower height than the solder balls. It *MUST* have lower height than the solder balls, or the chip will not sit down and the solder balls will not connect properly in that spot. You must not push down on the chip to overcome this error, that will spread the solderballs too wide and cause shorts between pads. A solder mask repair under a chip is not for mechanical protection, nothing can touch it once the chip is back on. It's only to prevent solder from contacting that exposed bit.
If it happens between two pads that both connect to the same line, for example ground, then it's low risk because those pads are effectively shorted together already by design.
How do you know where the problem is? Is there a plan that i can puchase or something like that?
Where didt you got this tools from
Got a video on chips with underfill, removal and replacement without grinding the chip away?
By grinding, do you mean reballing the chip?
@@HcqsUs No I mean micro cnc destructive removal of the chip. I've been having a terrible time trying to find any useful videos of removing underfilled chips, that are _not_ using s cnc router to physically grind the chip away. Found a couple on removing underfill once the chip is off, but not on the actual chip removal itself. I'm not sure how to do this, so my trial and error attempts have all ended up terribly destructive to both the chip itself and surrounding components.
What's was wrong with screen? Just faulty or a problem with backlight at the motherboard?
Thank you for your comment, this is a faulty screen.
👏👏👏👏👏👏👏👏
Thank you Akram,
What liquid do you use to clean the PCB?
What type of towel is used to place the WiFi chip on, was a cotton towel or paper towel?
Hi, our technician use the paper towel, cheers
Thin absorbant cleanroom wipes. By putting the wipe on top like this, you get several benefits. You don't scrape the brush directly on pads, so it is a little more gentle on the pads, original solder mask and smallest components. You soak up much of the old flux at the same time as wiping, so if you don't use excessive amounts of flux cleaner or IPA, you have some level of control where remnants of thinned out flux go, and less flux is absorbed into your brush or q-tips.
You don't need to rinse the whole board afterwards as much. It's less mess to clean up, you can just throw away the disposable towel. Your brush does not wear out as quickly.
sir wht abt air ...how to use
This is the content of our repair training
Where can I purchase the ICs?
Hi, you can find board ICs in our online shop: hcqs.shop/board-components.html