Questions tagged [soldering]

Soldering is the metallurgic process used to fix electronic components to a PCB. Soldering can be done by hand or automatic. PTH boards were usually wave soldered, SMT uses reflow technology.

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3answers
107 views

Glue or soldering?

A 13-pin cable glued to a PCB fell off. The PCB is for the LCD screen of a Canon electronic typewriter. The other end of the cable fits into the main board of the machine. I brought the PCB and cable ...
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3answers
113 views

Current leaks at 500 VDC

Background: I have a small soldered joint on a 500 VDC (0.1 A) lead that's exposed to air. The edges of the joint are fairly ridged and have a few significant edges. In the higher voltage range (40 kV)...
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92 views

Solder that won't stick

Solder to positive end. It stays for a second and unsticks from the board. What can I do? I'm nervous about burning the board.
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1answer
53 views

What's the best way to fix this missing solder pad?

During a repair of a mixer, I had to desolder the XLR output jacks in order to remove the front panel. When I started to resolder them I noticed that an pad (or eyelet? not sure of the difference) is ...
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3answers
81 views

How to connect wires coming from bottom side of a single-layer PCB?

I intend to use an IMS PCB, that is a PCB with aluminium substrate. It will be a single layer PCB (because of the cost, and heat), so only the top layer. I need to connect approx. 20 wires to the top ...
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2answers
102 views

How do I solder a ~20-pin USBc connector near heat-sensitive components?

I currently have an LG V20 and its charging port is deteriorating. Unfortunately, it is out of warranty and the best price that I can find to have it professionally repaired is US$60, which is about ...
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2answers
99 views

What is this white stuff on the solder of this PCB?

These photos were taken from a new-in-box 16kB memory expander for a Timex Sinclair 1000 computer. As far as I'm aware, it was never used. The box was made of thin cardboard with a two part styrofoam ...
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37 views

Soldering wires in place of mini USB

I'm working on a project that I need to take up as less space as possible. One of the components included a mini USB port that I have desoldered. The only problem is that the pads are too small. I ...
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2answers
499 views

Is there any connector for SMD components

I want to fine-tune the resonance of multiple LC-circuits with hand made inductors(coils), and SMD capacitors (NP0 type). Currently, I am tuning the resonance frequency by soldering and desoldering ...
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3answers
160 views

Pebble watch charging contacts worn out, options?

My pebble is getting harder and harder to charge, every time I need to clean the contacts, press hard and hope it charges, and once it does, hold it still.. I am wondering how I can improve the ...
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1answer
100 views

What is the idea behind “heat shrink tubing”?

I have ordered some tubes that are labelled as "heat shrink tubing". I wanted them to cover non-insulated wires in the montage, to prevent them touching something unwanted by chance, or each other. I ...
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37 views

Hot Air Rework Station

What is the best temperature for removing smd components on computer motherboard? I have tried setting the temperature to max which 450c and air at lev 5 but some chips wont come out. If they do the ...
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1answer
505 views

Can Computer Motherboards Work Fine Even With A Damaged SMD Capacitor/Resistor?

I'm asking this because when I was replacing my laptop battery, I accidentally hit and broke/disconected one SMD capacitor off the board, then I turned my laptop on, it made some weird electrical ...
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1answer
65 views

Echo in headphone after soldering

I am not an electrical engineer, but because I broke the 3.5mm jack of my headphone, I decided to mod it to have a removable cable. It's a headphone with mic (hyperx cloud2). It's working well when I ...
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2answers
55 views

How dangerous is soldering lithium ion phone battery, and how easy is messing up

I plan on leading a workshop on how to create led devices(shoes, clothing, etc), and mostly plan on teaching how to do it with old electronics, like phone batteries. The point is trying to do it as ...
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1answer
1k views

Desoldering a through hole capacitor with weird terminals

Apologies in advance if this is the wrong place to post this question. So I've just RGB modded an old CRT TV, and now I'm trying to replace a series of capacitors to hopefully fix some screen ...
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1answer
66 views

Determine solder ball size [closed]

I have ps4 stencils for ps4 APU. On the stencil it says 0.55. Can I asume that the solder ball size is 0.55 or can I go with 0.5? How can I determine the correct solder ball size for the bga chip? (...
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4answers
1k views

Could 48V arc across this small gap?

I have soldered two wires onto this Cree XHP 70.2 LED, tested it in a circuit, and everything works fine. I intend to wire four of these LEDs in series and drive them together at about 48V and 2.4A (...
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1answer
18 views

Matching S22 with a metal plate at the output

So assume we have a highfrequency device which has a missmatch at S22. Some of my colleagues solder a little round metal plate, placed on top of the signalpath it self (shortly before the SMA ...
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0answers
44 views

Accessing SMT pins on prototype board

I need to be able to solder wires to the hidden pins of an smt ic. The ic is soldered directly to the pcb, and they are not visible. I need to access the PCM audio interface on a sim7500e, and the ...
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1answer
70 views

How can I solder a 2nd connection to a mini USB?

I have a device that utilizes a mini USB port to send and receive data. I am trying to figure out how I can hook a micro controller to that mini USB port so that it can also send and receive data. ...
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2answers
89 views

Inhaled fumes from burning IC

I inhaled fumes that came out from burning IC from a module due to wrong wiring. Are that fumes lethal and what are those fumes made up of ??
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1answer
59 views

Keyboard switch removal problems

I recently put together a keyboard and had an issue with a couple switches so I decided to re-solder. I resoldered 2 and that fixed the issues but for this last one I started smelling something ...
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2answers
94 views

Cutting a slot in a PCB using a hand file for a USB connector - are the planes exposed and shorting with the connector?

I'm making a HID keyboard which connects through micro-usb. Unfortunately I made an error in the PCB design and missed including a slot for the usb connector to fit in. Being the enterprising DIY ...
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1answer
126 views

Why is solder not sticking to the PCB pads after using the hot air gun?

I'm training how to use the hot air gun at my hobby electronics station. It's a brand new machine. I can solder easy enough but the hot air gun is well so far only useful for wire shrink tube. Here's ...
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4answers
6k views

How to solder to this glass pcb?

I have this glass PCB I took from a calculator that I'd like to get working with my Arduino as a numpad, but it's a glass PCB. Is there any way I could solder wires to it?
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1answer
51 views

Soldering iron thermocouple measurement HELP

I'm working on a relatively simple soldering iron circuit. I'm using a T12 tip, which consists of a resistor and thermocouple in series. I'm driving the gate of the N channel mosfet with 20V via a ...
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44 views

How to connect to the PCB of an Alcatel Linkhub HH40

I recently bought an Alcatel Linkhub HH40 4G router. Unfortunately, the web interface doesn't provide the functionality I was hoping for (e.g., automatically disabling the radio functionality over ...
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1answer
61 views

How good is the Paracord 550 as an electrical insulator?

So following wikipedia the Parachute cord 550 is made from nylon Kernmantle rope, however this site where I sourced the cables from says that it is made of a Polyester sleeve (outer layer) and a core ...
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1answer
57 views

Rewire Ball-Type Mouse

Im trying to Frankenstein a trackball connection through a mouse controller exactly like this tutorial https://www.youtube.com/watch?v=VC7jhdAMwiw In short, Im using a ball-type-mouse PCB to connect ...
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2answers
309 views

Why isn't solder melting at 370 °C?

I recently tried to use a soldering iron for the first time, but I don't seem to figure out how to use it properly. In the articles I've read about how to solder properly, it is commonly stated that ...
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1answer
56 views

What type of solder to use with unregulated 25W soldering iron?

I have a general purpose unregulated 25W soldering iron (soldering pencil.) What type of solder is suitable for this (melting point degrees, composition?) Mainly for simple repair work (solder ...
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6answers
97 views

Permanent circuit board jumper - I have a RTC chip that kills soldered battery before clock set

If I wave solder in the battery, it begins draining rapidly until the RTC chip (clock) is set. So I installed a jumper. Now I manufacture without the jumper, and then in the bed of nails testing, I ...
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1answer
54 views

How to change the led on this board to a brighter led? 12v input

Needed to change these led to brighter led. Is it possible? If yes then how can it be done? Noobie!!
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0answers
31 views

Burnt Power Jack connection point

New to computer repair and recently came into possession of an old laptop for free after the owner gave it it to me. Initial problem with it was the power jack and the battery, changed the battery ...
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2answers
56 views

Do need to solder on the pin headers panels on the edges of a protoboard or can I just attach them without solder?

I have my first circuit on an Arduino Protoboard, and I was wondering if I had to solder the header pins to the board like the other components?
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1answer
77 views

How to switch a leaded solder soldering station over to lead free solder

I have a soldering station which used leaded solder. I now want to switch over to lead free solder and as such I want to clean the tip. How can I clean the tip of the soldering iron such that I can ...
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2answers
77 views

If I have two aligned PCBs with pads touching each other, will they bind if I reflow them?

I have a design where two boards of the same size will be stacked like pancakes and physically touching. I want to electrically connect them, and I thought of just adding matching solder pads and ...
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2answers
140 views

Beginner soldering help - solder balls/doesn't liquefy and soldering tips blacken

Very frustrated!! Have gotten into electronics recently and watched many videos about soldering and proper technique. I started out with the iron from this kit: https://www.amazon.ca/gp/product/...
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4answers
138 views

Can I use aluminum foil for a heat gun as a nozzle?

Wanted to desolder a small chip with 48 pins on a PCB. Since my heat gun didn't come with a small nozzle included, can I use aluminum foil to create a ghetto nozzle for it? What can I do as an ...
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0answers
28 views

6.3mm Pickering (60's / early 70's) phone/headphone jack Red Blue Black soldering

Hi All, I could guess but that's what ya'lls can help me with. Assuming Black is common & soldered to the top perpendicular tang two end tangs just hold the wired. trying to only solder ...
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5answers
137 views

How to desolder an element from a PCB?

I want to desolder an element from a PCB, I can see all the solder joints that are holding it on to the board and I can reach all of them easily. I am not very experienced in working with a soldering ...
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1answer
71 views

Copper oxide on cables after tinning w/ no clean flux

We just found a problem with some (translucent) speaker wire. We have been tinning wires for a year by dipping the stripped end in no clean flux and then dipping again in lead free solder. We have a ...
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0answers
80 views

SMD LED without soldering

I am working in a project at the university and we need to test (electrically and optically) several different SMD LEDs. The idea is to use or create a socket able to connect the terminals of the LEDs ...
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0answers
56 views

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 ...
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1answer
25 views

Pad disconnected from smd chip

I was trying to breadboard a circuit using 3-D antenna chip. I didn't have pcb board ready for it so I tried to solder jumper wires on the pads and then test the circuit by breadboarding. After ...
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1answer
71 views

How to solder large smd components on a PCB with 2oz copper

I’ve got a large inductor that needs to be soldered to my board. The pads are hidden underneath the component so hand soldering is not an option. The data sheet says to reflow at 260c for 40 seconds ...
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4answers
79 views

Special soldering requirement

I have a special requirement on soldering which I do not know how to achieve. I now need to solder cable to large copper part, which require high solder power. On the other hand, the temperature of ...
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1answer
133 views

Is this chip still usable?

I tried soldering jumper wires to my 3-D antenna, CAS143-47 and little bit of solder found it's way on the chip's body away from the pads. It was my first attepmt at soldering. It looks ugly and ...
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2answers
198 views

Reflow Soldering at home

I’m trying to solder my TSSOP-16 chip to the DIP adapter. I’m planning to apply solder paste to the adapter’s pads, put the chip on the adapter and then use my kitchen oven to melt solder paste and ...

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