Electrical Engineering

Questions tagged [rework]

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Recommended air flow and temperature in hot-air gun to recover a MLB from MacBook

First I would like to say I've searched and researched, I think enough, for an old topic that discuss this matter but wasn't able to find any specific information. I've a main logic board from a ...
1
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1answer
55 views

How to reflow a part in an infared IR rework station?

I bought a cheap chinese infrared rework station, mainly to unsolder large QFN's or QFP's from a board. The main problem with hot air is the inability to heat large areas evenly. I can easily ...
1
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1answer
87 views

What's the best type of tape to cover a pin on a connector?

I have a pin (the flat kind--think a PCIe card) that I need to tape over to block the signal. What type of tapes work well for this? I tried electrician's tape, but it's a bit too thick and stretchy. ...
17
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9answers
5k views

How to remove this component from PCB

Anyone have any idea how I could remove this component? I've tried blowing hot air, used solder wick, tried to poke the holes with two soldering irons, cut the pins to near the PCB, but it won't ...
2
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2answers
270 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 ...
4
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8answers
3k 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
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2answers
122 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
117 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
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2answers
125 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 ...
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1answer
90 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 ...
3
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3answers
2k 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
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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
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1answer
157 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 ...
2
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2answers
315 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 ...
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1answer
1k 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
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1answer
146 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....
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2answers
6k 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
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1answer
277 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 ...
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0answers
152 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
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3answers
11k 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
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1answer
59 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
429 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
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1answer
339 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
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1answer
2k 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
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3answers
210 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, ...
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4answers
198 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 ...
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4answers
609 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'...
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2answers
664 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
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6answers
2k 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
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4answers
394 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 ...