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Old 07-04-2022, 03:36 AM   #1
corrize
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Default How to desolder this component beside chemical cap ?

Hello, I need your advise pls ?
The black component at the center of picture is dead, I need to replace it (itís a Nikon D5 camera). Itís easy to desolder with hot air. But beside, there is a chemical cap, and I donít want to destroy it.

How do you do ?
I have low melt solder and good capton. Is it better to desolder the cap (for safe) with iron, then desolder-resolder the black component with hot air ? Or these caps are strong enough and capton and other cover can avoid hot air damage ?
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Old 07-04-2022, 03:49 AM   #2
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Default Re: How to desolder this component beside chemical cap ?

You add leaded solder to the chip you want to remove, then you cover all the other nest by stuff with capton tape and then proceed to remove the IC with hot air and a small nozzle. I wouldn’t worry about that brown SMD cap beside it. Matter effect, I’d even take it off if it’s in my way.
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Old 07-04-2022, 09:18 AM   #3
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Default Re: How to desolder this component beside chemical cap ?

Angle the nozzle away from the cap and plastic connector, capton tape and or a thermal pad to protect from the heat if you're worried.
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Old 07-04-2022, 02:15 PM   #4
corrize
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Default Re: How to desolder this component beside chemical cap ?

OK thanks, I will do all that. I will mix low melt solder at chipís pads with a solder iron for help a little bit, because there is a thermal pad under chip.
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Old 07-05-2022, 05:37 PM   #5
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Default Re: How to desolder this component beside chemical cap ?

Drill a hole or take somehow the cap of the IC, cut the legs and take everything off with the soldering iron.
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Old 07-07-2022, 07:18 AM   #6
corrize
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Default Re: How to desolder this component beside chemical cap ?

I grinded the chip, I removed the half of the box, I dont have tools for more. I made a short attempt (410 degree), I saw the solder bright but I canít remove the chip. Not enought heat or it could be soldered to PCB ground pad ? I guess I should remove the chemical cap first ? I have true low melt solder, I can use it ?
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Old 07-07-2022, 07:55 PM   #7
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Default Re: How to desolder this component beside chemical cap ?

I took larger stuff off with that trick using my 80W soldering station at 380C. You can preheat the bottom of the board with the hot air while using the soldering iron on top. If you feel comfortable, drill the hole a little deeper.
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Old 07-09-2022, 09:03 AM   #8
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Default Re: How to desolder this component beside chemical cap ?

You can do what CapLeaker is suctioning but you would need to use a dril bit slightly smaller in diameter than the hole size and drill in the center of the hole on the board for best results
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Old 07-09-2022, 10:50 AM   #9
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Default Re: How to desolder this component beside chemical cap ?

Quit with the drilling and learn how to use your hot air.
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Old 07-11-2022, 09:00 AM   #10
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Default Re: How to desolder this component beside chemical cap ?




my bad
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Old 07-13-2022, 12:41 AM   #11
corrize
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Default Re: How to desolder this component beside chemical cap ?

Hum, it seams I was not clear in the last post… In this thread I’m scared to destroy the chemical cap… But look the last pictures, it’s not a chemical cap, it’s a coil ! LOL
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Old 07-13-2022, 09:43 AM   #12
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Default Re: How to desolder this component beside chemical cap ?

Quote:
Originally Posted by corrize View Post
Hum, it seams I was not clear in the last postÖ In this thread Iím scared to destroy the chemical capÖ But look the last pictures, itís not a chemical cap, itís a coil ! LOL
I was going to say that but was afraid I was wrong. I was looking everywhere for a cap (???) lol. Yeah you can melt that coil package...no harm done, just make sure it's still continuous of course.
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