Questions tagged [rework]
The rework tag has no usage guidance.
47
questions
3
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How do I cut a trace?
I've often had the need to cut a trace here and there to debug something or fix a bad layout. I've not really come up on a way to do so that's
Safe
Controllable
Reliable (won't magically reconnect if ...
- 12.4k
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0
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152
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Solder balls or solder paste for reballing?
So, I'm planning on doing a reball for the graphics chip of my Pavilion DV4-1212LA.
It's going to be the first time so I have to buy the required tools, like a suction pencil for lifting the IGP, fine ...
- 159
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0
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25
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For BGA rework, can a kitchen plate-/dish- warmer be used after preheating in oven?
Doing some casual PCB reworks for repair purposes, I'm looking for ways to improve the process.
Currently, I'm using a (not yet) modified kitchen oven to preheat, and then hot air to reflow.
A problem ...
- 181
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51
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BGA rework - Help needed
I've just started working on a PCB with BGA components (EPC GaN HEMT devices, plus BGA gate drives), and my attempts at assembly, have been quite frustrating.
I'm using a heat plate (set to 150 ...
- 49
0
votes
0
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88
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Rework with a coating over the solder joint
I've got a simple board to repair (a switch/junction board for a fancy bike light). The wires to a DC connector broke because of insufficient strain relief.
It's a trivial job, except there's a paint-...
- 2,541
0
votes
1
answer
119
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What is this "tool" and how is it used? [duplicate]
I purchased a rework station, and it came with the tool shown. I've never seen or used such a device before but checking the illustration of a couple of other rework stations showed similar tools ...
- 103
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1
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135
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How to prevent repeated re-soldering of SMD chip during testing?
Lets say you have a commercial device you are experimenting with. It has a flash memory chip that cannot be read while in-circuit (I have already tried the clip thing), so you have to de-solder it ...
0
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0
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21
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what's the proper soldering iron temperature for wave soldered cards using with SACX plus 0307 bars
Hello all we need a proper technique to rework for wave soldered PCB's either SMD or Leaded components . We are using SACX plus 0307 solder bars for wave soldering . Here we have soldering issues with ...
0
votes
0
answers
41
views
BGA Stuff, unstuff PCB Pad Short
I am using Artix 7 FPGA (XC7A200T-2FPG676) BGA package on PCB, after unstuffing of FPGA I want to short two pad P18 and R18 on PCB with each other and then wants to stuff back my FPGA .
Note: P18 and ...
0
votes
1
answer
195
views
Connect 2 BGA pins before soldering IC?
My first thought was it's not possible but I need a method that could potentially work, just for testing purposes. What I'm trying to do is the following:
I forgot to breakout one BGA pin that I need ...
- 83
0
votes
1
answer
183
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Flux for removing LGA socket
I have been looking into the stackexchange searchbar and also I have been searching for a day or two globally, even the "similiar dialog on this website" when I was creating this post.
I ...
- 3
1
vote
2
answers
273
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How to remove solder bridges on a 6-layer PCB - how to rework a board that won't heat?
I made my first batch of 6-layer PCBs. On some of the boards I got a solder bridge on an MCU - I know I need to improve my design, my solder mask, and my mounting method.
Usually on 2- or 4-layer PCBs ...
- 498
1
vote
0
answers
92
views
oven rework - possible culprit?
These small LGA16 parts needed replacing:
Desoldered them with heat gun, cleaned with acetone, put new parts into place, fixed them with this sticky aluminum tape, applied flux and put them to the ...
- 1,060
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3
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148
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Is there anything like spring steel hold-down probes to help with SMT assembly?
I occasionally do minor SMT assembly and re-work. I know the standard practice for holding parts is to glue them, but sometimes I'd like to have a more temporary approach. For example, sometimes I ...
- 113
2
votes
3
answers
694
views
How to stop frying components with my rework station?
Recently I decided to invest in a rework station (namely the Yihua 858D) as I am sick of ruining pads when desoldering components.
Just today, I have fried £50 in components.
I am using the station to ...
- 137
1
vote
2
answers
593
views
Laptop HDD (100565308 Rev A) BIOS chip swap - chip won't come off?
I'm attempting to remove a BIOS chip from a Seagate Momentus 7200.4 HDD with a 100565308 Rev A chip number.
I've followed videos ...
- 13
2
votes
1
answer
246
views
BGA VCC and VSS shorted after desoldering
I am really confused with working with BGA chips.
I am new to this but have been following other guides so I thought I should give it a try. I am using a DIY pre heater that has a 800watt IR bottom ...
- 23
7
votes
3
answers
2k
views
Audio signal on oscilloscope
I am exploring the mainboard of an Epson 3010 projector. This particular projector has internal speakers but does not have an audio out and - as I have built my own external audio amplifier - I wanted ...
- 125
1
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1
answer
133
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 ...
- 78k
1
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1
answer
143
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. ...
- 123
17
votes
9
answers
7k
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 ...
- 393
2
votes
3
answers
2k
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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 ...
6
votes
8
answers
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 ...
- 16.8k
3
votes
2
answers
2k
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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 ...
- 133
4
votes
1
answer
286
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 ...
- 2,496
4
votes
2
answers
252
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 ...
- 625
1
vote
1
answer
420
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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 ...
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3
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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 ...
- 1,133
10
votes
7
answers
3k
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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 ...
- 137
2
votes
1
answer
207
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 ...
- 595
2
votes
2
answers
501
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 ...
- 189
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1
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2k
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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 ...
- 21
1
vote
1
answer
257
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....
- 625
2
votes
2
answers
16k
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 ...
- 625
0
votes
1
answer
485
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 ...
- 3,526
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votes
0
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253
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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 ...
- 625
3
votes
3
answers
24k
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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 ...
- 321
1
vote
1
answer
69
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 ...
- 2,298
3
votes
3
answers
618
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 ...
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2
votes
1
answer
375
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 ...
- 2,496
1
vote
1
answer
3k
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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 ...
- 365
4
votes
3
answers
406
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, ...
- 589
0
votes
4
answers
898
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 ...
- 17.5k
1
vote
4
answers
778
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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votes
2
answers
1k
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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 ...
- 31.7k
2
votes
6
answers
2k
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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 ...
- 31.7k
0
votes
4
answers
454
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 ...
- 1,008