Work on SMD circuit board

Ya’akov

Joined Jan 27, 2019
5,657
Your question is so ambiguous as to be unanswerable.

Are you asking about tools? Techniques?

Why Android in particular.

Could you explain what you are trying to do?
 

Thread Starter

basudeo

Joined Oct 24, 2020
8
How to check and work with on SMD circuit board sometimes it is very difficult to sold and pull the nano components?
 

AlbertHall

Joined Jun 4, 2014
12,020
I got a cheap hot air machine and it makes removing smd components very much easier and with less risk of damage to the board and the surrounding components. I still use a soldering iron to place components on the board.
 

Thread Starter

basudeo

Joined Oct 24, 2020
8
I got a cheap hot air machine and it makes removing smd components very much easier and with less risk of damage to the board and the surrounding components. I still use a soldering iron to place components on the board.
How to protect other components from hot gun heat while working on one component?
 

AlbertHall

Joined Jun 4, 2014
12,020
The gun comes with assorted nozzles so you can choose a suitable size. You heat the part you want to remove and as soon as the solder melts you can remove the air and the component (tweezers) so the surroundings get minimum heat.
 

nsaspook

Joined Aug 27, 2009
9,723
But in this option it is very prone to melt plastic cover and nearby components, as the temp of blower / hot gun around 350 or 500 deg c.
The tape or thin foil taped to the PCB will act as a heat barrier to reduce the transmission of heat to what's below.
With a narrow tip, low air flow, proper heat range and practice you can easily remove components without damaging taped components. If the near components are really sensitive then hot tweezers are necessary.
 
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Thread Starter

basudeo

Joined Oct 24, 2020
8
What will require the ambient temperature and air of blower /Hot gun for pulling / fixing out smd components?
 

nsaspook

Joined Aug 27, 2009
9,723
Chip upgrade SMD rework. I designed the board to give plenty of space around the controller for easier soldering and possible controller upgrades.
New chip installed.
PXL_20210425_202921374 (1).jpg
PXL_20210425_201429755.jpgPXL_20210425_200721782 (1).jpgPXL_20210425_200703208 (1).jpgPXL_20210425_200557604 (1).jpg
Old chip removal.

This was all done with a
 

JohnInTX

Joined Jun 26, 2012
4,667
Chip upgrade SMD rework. I designed the board to give plenty of space around the controller for easier soldering and possible controller upgrades.
New chip installed.
View attachment 239886
View attachment 239887View attachment 239888View attachment 239889View attachment 239890
Old chip removal.

This was all done with a
I am finally setting up a rudimentary SMT rework/prototype station. I like the Sparkfun HotAir rig.

What are you using for a digital microscope? Happy with it? Recommendations for old eyes? I don't mind spending a few $$ for a good rig. Kind of like the ability to use a BIG monitor too..
Sorry for the hijack. Thanks in advance!
 

dl324

Joined Mar 30, 2015
14,458
How to repair Android phone with accuracy and quality?
Take it to an authorized repair shop. In theory, they'll be able to do a complete test after they think they've repaired it. Otherwise, there's no guarantee that there won't be some undiscovered problem.

EDIT: inserted "won't be"
 
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nsaspook

Joined Aug 27, 2009
9,723
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