Author Topic: Whole-glued PCB taking apart  (Read 589 times)

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Offline marhuumTopic starter

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Whole-glued PCB taking apart
« on: January 14, 2025, 11:01:01 am »
How is the most efficent, correct way to take apart a PCB which is a entirely laminated/glued in such that no one can normally act to flip around to face the PCB's PC ie. printed circuit side ?

It's old front-load Samsung wash machine's (but made in China) whose On-Off tactile push switch spring was dysfunction and then its pins have been broken too because has been  pull apart forcefully it's sitted at top-right spot
Useful correct guidance or info is invaluable, gratified
« Last Edit: January 14, 2025, 10:38:44 pm by marhuum »
 

Offline inse

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Re: Whole-glued PCB taking apart
« Reply #1 on: January 14, 2025, 11:18:16 am »
This PCB is potted, usually only to be removed mechanically.
Is the potting compound hard or soft?
 

Offline Greybeard

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Re: Whole-glued PCB taking apart
« Reply #2 on: January 14, 2025, 11:27:43 am »
You can try hot air in combination with mechanical scratching tools.
 

Offline marhuumTopic starter

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Re: Whole-glued PCB taking apart
« Reply #3 on: January 14, 2025, 11:43:56 am »
This PCB is potted, usually only to be removed mechanically.
Is the potting compound hard or soft?

I believe it's soft, as we can see a bit white due to as a scraped part on top-right corner, by end-sharp metal shaft
« Last Edit: January 14, 2025, 10:39:47 pm by marhuum »
 

Offline inse

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Re: Whole-glued PCB taking apart
« Reply #4 on: January 14, 2025, 12:05:12 pm »
Or carefully grind an orifice from the back side to access the solder pads, might be less effort
« Last Edit: January 14, 2025, 02:38:32 pm by inse »
 

Offline ciradrak

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Re: Whole-glued PCB taking apart
« Reply #5 on: January 14, 2025, 09:01:23 pm »
I'm trying to fix a similar machine.   Is the encasing material silicone?   On mine I extracted the board by using a small Dremel cut off wheel on the hard plastic case & then prying away the encasing silicone using a large plastic spudger to avoid damage to the circuitboard.

I tested mine to see if the soft clear material around the board would melt using a soldering iron.  It did not melt at all.
 

Offline max.wwwang

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Re: Whole-glued PCB taking apart
« Reply #6 on: January 15, 2025, 07:02:25 am »
Potting is commonly seen, based on my experience, with the boards of Samsung washing machines. It's convenient for the manufacturer, but looks super ugly and is painful for people who need to repair or salvage parts from them. I hate it.
Neutral | grounded
 

Offline Poroit

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Re: Whole-glued PCB taking apart
« Reply #7 on: January 16, 2025, 07:49:37 am »
as per @inse post.

CAREFULLY dig it out manually.

It can be a frustrating process !!
 

Offline inse

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Re: Whole-glued PCB taking apart
« Reply #8 on: January 16, 2025, 08:00:42 am »
I know, that‘s why I proposed destructive approach only to expose pads of ripped out switch
 


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