Where to start? 1) It may say "No clean" flux, but clean it. Especially when you made your second attempt. Get some 99& IPA, dissolve the burnt sticky mess and remove with a cotton bud or microfiber wipe. 2) More flux. If the work are is not glistening wet with flux, add some. Among other things, this will promote the natural surface tension of the molten solder to flow between the pads and pins and spring into shape. 3) The solder tip is not a paint brush. Stop painting the solder. Heat the surfaces and allow the flux and solder's surface tension to work. Let the solder flow into place. Definitely stop raking the solder tip across the delicate pins. You're not getting any heat onto the pads and you're just bending the pins and soldering them to themselves. 4) Less solder. Solder tip size or shape isn't the reason for so many blobs and bridges. It's the amount of solder being used. 5) When your chip is on the pad, use one finger of your free hand with gentle pressure to hold the chip in place while you solder a pin on a single corner. Check the alignment and solder the opposite corner. With only two corners (ideally two pins) soldered, you can continue to make small adjustments by re-heating one corner and very slightly pivoting the other. 6) Steady your solder hand like you would a writing utensil or typing on a keyboard. Your forearm, wrist, palms or edge of your partially closed hand will be firmly anchored on the desk surface. 7) Think all the pins are solid and you have no bridges? Did you do step #1? Even when you've indicated you thought everything was good, it's hard to tell if there aren't still some bridges on some of the pins in that frame. Clean the burnt flux, dry the area and re-inspect.
its the fine things like @stevenbrentson8 has mentioned your technique is rough but it will improve with practive you have to actually do this by hand a few times before you find the perfect method for you.
I always try to use tweezers to apply pressure on the chips when you clean it. Also you could always flux up and use the heat gun whilst applying pressure. But good effort hope you get it sorted soon. They always a pain well done not a easy task you did 😊
I'm fairly competent at soldering but I always dread working on VLSI chips, they can be a real pain. Even through-hole components can be tricky on boards with internal ground and power planes.
Your hand is correct mate you did well for a first attempt I have seen far worse soldering on QFP packages and had to undo some pretty bad messes. Well done for attempting it bud all you need now is practice, practice, practice
Not the easiest things to solder, it's almost as difficult as you made it look 🤣 2nd attempt wasn't too horrible. Pads could have been cleaned flatter and put some pressure on the chip where you're tacking it down - it will be a lot easier if the pins are closer to the pads. Also it looked like you needed to keep adding fresh flux more, and keep cleaning you iron tip.
Where to start?
1) It may say "No clean" flux, but clean it. Especially when you made your second attempt. Get some 99& IPA, dissolve the burnt sticky mess and remove with a cotton bud or microfiber wipe.
2) More flux. If the work are is not glistening wet with flux, add some. Among other things, this will promote the natural surface tension of the molten solder to flow between the pads and pins and spring into shape.
3) The solder tip is not a paint brush. Stop painting the solder. Heat the surfaces and allow the flux and solder's surface tension to work. Let the solder flow into place. Definitely stop raking the solder tip across the delicate pins. You're not getting any heat onto the pads and you're just bending the pins and soldering them to themselves.
4) Less solder. Solder tip size or shape isn't the reason for so many blobs and bridges. It's the amount of solder being used.
5) When your chip is on the pad, use one finger of your free hand with gentle pressure to hold the chip in place while you solder a pin on a single corner. Check the alignment and solder the opposite corner. With only two corners (ideally two pins) soldered, you can continue to make small adjustments by re-heating one corner and very slightly pivoting the other.
6) Steady your solder hand like you would a writing utensil or typing on a keyboard. Your forearm, wrist, palms or edge of your partially closed hand will be firmly anchored on the desk surface.
7) Think all the pins are solid and you have no bridges? Did you do step #1? Even when you've indicated you thought everything was good, it's hard to tell if there aren't still some bridges on some of the pins in that frame. Clean the burnt flux, dry the area and re-inspect.
These are all good tips.
its the fine things like @stevenbrentson8 has mentioned your technique is rough but it will improve with practive you have to actually do this by hand a few times before you find the perfect method for you.
Good tips, thanks.
I'm staring down thee barrel of attempting this myself - any reason not to use hot air to do the replacement?
I always try to use tweezers to apply pressure on the chips when you clean it. Also you could always flux up and use the heat gun whilst applying pressure. But good effort hope you get it sorted soon. They always a pain well done not a easy task you did 😊
Looks far better on the 2nd attempt mate ... Good luck getting it running :) ..
Well done for giving it a go!
I'm fairly competent at soldering but I always dread working on VLSI chips, they can be a real pain. Even through-hole components can be tricky on boards with internal ground and power planes.
Your hand is correct mate you did well for a first attempt I have seen far worse soldering on QFP packages and had to undo some pretty bad messes.
Well done for attempting it bud all you need now is practice, practice, practice
I'm sure everybody's first go is pretty bad. I'm just doing it on camera and making my mistakes in public, lol
Solder 2 legs the board on opposite sides, then position the bent pins into their proper locations, and use a small, pencil point size tip
Not the easiest things to solder, it's almost as difficult as you made it look 🤣 2nd attempt wasn't too horrible. Pads could have been cleaned flatter and put some pressure on the chip where you're tacking it down - it will be a lot easier if the pins are closer to the pads. Also it looked like you needed to keep adding fresh flux more, and keep cleaning you iron tip.