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Questions tagged [rework]

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2
votes
2answers
66 views

SMD desoldering - struggling to get this chip quik stuff working, what am I doing wrong?

So I have to replace a SMD connector, and although i do have soldering experience, it's all with THT. I watched like 10 different YouTube videos on chip quik, and they all made it look so easy, so i ...
5
votes
8answers
2k views

How can I add “standoffs” to elevate a SMD component above the PCB?

I made a mistake when creating a symbol/footprint for a small (2.0 x 1.6 mm) SMD crystal and didn't notice until the prototypes didn't work. Unfortunately, the boards are tiny and expensive (0.4 mm ...
3
votes
2answers
83 views

Is hot air only meant for desoldering?

The question is simple. I only ever seem to find a soldering-related hot air gun on a machine dubbed a “rework station” and the only reference I can find to using hot air to solder SMD components is ...
4
votes
1answer
88 views

When I rework an SMD capacitor or resistor, it will sometimes stick to the soldering tip. Does this high temp then destroy it?

When I rework 0402 capacitors, then often stick to the tip of the soldering iron. My iron is set at 350. I then discard the cap because I am worried the sustained temp for a few seconds has destroyed ...
4
votes
2answers
113 views

Importance of wicking during rework?

I’m wondering how crucial it is to remove as much of the old solder on a bga chip and corresponding PCB pads. Is it best practice to always wick before applying fresh leaded solder? (Presuming most ...
1
vote
1answer
71 views

Suggestions on soldering through hole large planes

I am small scale manufacturing PCB's I designed for high power actuator and LED control. It is 6"x8", 2 ounce copper and large power and ground planes, with no thermal reliefs. It has a section at one ...
2
votes
2answers
1k views

Is aluminium foil a good substitute for kapton tape when soldering?

Can I substitute kapton with aluminium foil when de/soldering a component onto a PCB? I want to desolder a tiny surface mount button from the motherboard of a phone... There are a lot of similarly ...
10
votes
7answers
2k views

Desolder two PCBs soldered together

I have a PCB with an RF module that is built on top of another PCB. If you look at the picture below you can see that it is almost identical to what I have soldered on top of the PCB. The difference ...
2
votes
1answer
139 views

What is the difference between a low end and a high end rework station, and why pay for a higher end station? [closed]

I just got a cheap Chinese rework station, which broke on me after a few minutes. After some inspection, I've found that most of these low end soldering stations look exactly the same, minus some ...
3
votes
2answers
275 views

Recommended pad size for desoldering?

I am designing a PCB that has will hold an Arduino Micro, as well as other components. One of the electrical engineer mentors that are overseeing the board development has told me to increase the ...
1
vote
1answer
981 views

Trying to fix broken capacitor, help? [closed]

So I found an HDTV on the side of the road, brought it home, took it apart, and found the problem. A blown capacitor. So I replaced it with another one of roughly the same value (original was 16 V 470 ...
1
vote
1answer
123 views

Safe to use bigger heater element?

So here's the run down, I purchased a rework/soldering iron station off eBay years ago. Believe it's a cheap Chinese knock off labeled CE 852D+ Recently the heater element for soldering iron went bad....
1
vote
2answers
4k views

Hot air rework temperature to avoid solder melt on opposite end

When removing/replacing chips. Is it safer to use little to no air flow but higher temp heat or lower heat with more airflow? My hot air station is a model 852d+ with a max temp setting of 500c and ...
0
votes
1answer
222 views

Unsolder large TO-220 or TO-247 packages

I'm aware this question may be construed as asking for advice but I'm going to venture to ask anyways. Does anyone have a good method for removing larger TO‑220 or TO‑247 packages? I ...
0
votes
0answers
130 views

BGA Underfill Problem

The problem is that when I heat an underfill chip to reflow it, the solder tends to boil and come out of the sides causing shorts and other problems. Does anyone know how to prevent that and why it ...
2
votes
3answers
8k views

Best Way to Solder/Desolder Surface Mount Components

I recently got my hands on some old motherboards/PCB's, and even though I know reusing parts from old PCB's is not as good as using new parts, I was wondering what the best way is to solder/Desolder ...
1
vote
1answer
58 views

reworking DIY SMT board

I reflowed an SMT board using a hot plate. Afterwards, I noticed that two small pitch QFN components are shifted by about 1mm, and I'm worried that the contacts aren't right. I haven't added any ...
3
votes
3answers
391 views

Removing PCB from complex pattern of soldered-in thru-hole posts?

I have a PCB mounted to a chassis with 16 feedthrus, the feedthrus posts are soldered to plated thru-holes in the PCB. I would like to remove the PCB from the chassis, the problem is that I am unable ...
2
votes
1answer
336 views

Can this be reworked with a hot air gun?

I posted before about the Microchip RN4020 (Bluetooth Low Energy) PicTail failing. I have some spare RN4020 modules and access to a heat gun. If I can take this RN4020 off and put a new one on, how ...
1
vote
1answer
1k views

What is the type of solder used in a playstation 3 (PS3)? And its melting temperature?

I have a hot air station and I'm trying to replace the HDMI port on a PS3 (playstation 3). The problem I'm having is trying to melt the solder on the hdmi port. I'm curious to what kind of solder its ...
4
votes
3answers
189 views

Good method to remove tenting on vias after assembly for debugging?

This is a question about modifying an assembled board to make it easier to debug. In a perfect world, I would have left the bottoms of these vias un-tented. Whoops. I have two BGA parts on a PCB, ...
0
votes
4answers
195 views

What is the optimal way of clearing solder from surface-mount PCB pads for rework?

Say I have an assembled PCB with a QFP package on it. This device gets damaged and I need to replace it. Getting the device off is straightforward, but now all the pads have solder blobs on them. Is ...
1
vote
4answers
563 views

remake PCB hole

I was soldering some components on a PCB and suddenly i realized that i soldered a wrong resistor (i should solder a 10k ohm and I did solder a 1k ohm). I tried to remove it, with iron solder (it wasn'...
0
votes
2answers
609 views

I forgot a resistor on my PCB prototype - how do I add one in?

I need to add a resistor into a data line on my project. The data line is a trace and carries low speed data. A through-hole resistor will be fine. The pins for both ends of the trace are exposed, but ...
2
votes
6answers
1k views

Reworking a PCB - remove these components

I'd like to remove all the ICs from the below PCB, hopefully preserving them for future use: This was a failed (ish) reflow attempt using paste and a hot plate. I have a hot plate, a hot air machine ...
0
votes
4answers
375 views

Rework station recommendations?

We're looking for a decent hot air SMD rework station to help us fix up our prototypes. In the past, I've used one of the low-end Aoyue models, and found it lacking (the interface had problems, and ...