All Questions
Tagged with pcb-assembly surface-mount
58
questions
1
vote
1
answer
68
views
Unknown SMD component - PCB Designation question
I have a board we are trying to repair. We are unable to get any technical documents from the manufacturer, no schematic or BOM for the board. This has multiple switches, think metal dome you press ...
- 13
3
votes
1
answer
223
views
Identify 5 pin smd marked "KV.." from motherboard led tv Panasonic
Identify 5 pin smd from motherboard led tv Panasonic that burned.
- 31
1
vote
1
answer
102
views
Identifying an SMD component
It is related to the USB bus voltage in a Delta HMI that has been damaged. Is this a 2.4 V Zener diode? This component is marked with the letter D311 on the PCB.
0
votes
0
answers
41
views
Could 94-HB board be used for SMD and THT soldering?
I have a circuit that I designed lately which is quite simple based on just 1 opamp and have an SMD and THT components (like a relay) and will be producing mass production in Chinese factories and it ...
0
votes
0
answers
70
views
SMD button not in jlcpcb BOM
I want to try the jlcpcb assembly service.
I created the BOM, by using the bom2grouped_csv_jlcpcb. I inspected the generated file and indeed all the SMD components ...
- 1,369
4
votes
1
answer
275
views
SMT Reflow solder quality issue with SN42/BI58 paste
I have been doing hardware design and PCBA prototyping for a while and I have issues with quality of reflow soldering. I have a small lab including a pick'n'place machine, stencil printer (eC-stencil-...
- 453
0
votes
0
answers
77
views
QFN-28 REVERSE Breakout Board
I am trying to build a PCB board that I found on GitHub. In a rash we ordered few sets of the PCBs without inquiring about the parts availability. Turns out one of the parts is not available in all ...
- 109
15
votes
3
answers
3k
views
SMD 0402 resistor flipped on its side
I received some boards back from the PCBA fab and noticed that one 0402 resistor is flipped onto its side (R25):
This site tells me this is a pick-and-place error. But the footprint happens to be one ...
0
votes
2
answers
196
views
Aligned vs not-aligned components: Which is better for PCBA process?
I am designing a Raspberry Pi hat PCB for a home automation control project.
It contains many SMD resistors and capacitors.
I was just wondering if aligned components have any benefit over not-aligned ...
- 73
6
votes
4
answers
3k
views
SMD, reflow or hot-air gun?
What are the advantages and disadvantages of using a reflow oven vs a hot air station for prototyping SMD PCB? Do you need an oven or would an air station work?
- 720
0
votes
1
answer
70
views
SMT PCBA production
I am interested in setting up an SMT factory for producing PCBA. I have researched and know the whole assembly process such as solder paste application, reflow oven, etc. Regarding the packaging of ...
- 13
2
votes
3
answers
809
views
How do I get pin headers to reflow flat to the board?
I work for a small company as an apprentice. We build mostly mass produce double sided PCBs. We are having trouble keeping the pin headers flat to the PCB through the reflow oven process.
The first ...
- 21
6
votes
1
answer
462
views
Why do I have shorts/bridges on QFN packages on PCBA during assembly? Stencil Printing problem
I am trying to do a home assembly of PCB but I have issues after reflow soldering. Especially I have bridges/shorts on the pins of QFN packages. I have assembled multiple boards other joins are okay ...
- 453
4
votes
1
answer
2k
views
Solder SMD on through hole
Can I just solder an SMD part directly on the through holes of the PCB?
The pitch of SMD matches the pitch of the through holes.
- 161
2
votes
1
answer
1k
views
What could have caused this SMD capacitor failure?
I have an 0805 capacitor that has failed short circuit on a board. The maximum voltage it would see should be 16V. It has value 4.7uF, is rated to 25V and is X7R.
I don't understand why it might have ...
