Generally, how to connect so many pins to the PCB on the external LCD board

If it is a pin connector, it is almost impossible to remove it from the PCB board. Forced removal, both the board and the connector must be damaged.

Blowing with a heat gun, blowing all the pin tin, the board is broken, and the connector is broken. Just for the sake of demolition, for better or worse, you can do it.

It is a cruel way, put the board in a molten tin pot, the connector can be easily removed, and all the components on the board can be easily and quickly removed.

Generally, it is connected by COF, one end of COF is bonded to the glass terminal, and the other end is bonded to the gold finger of the PCB board.

Looking back and forth, measuring with a watch, with the help of a magnifying glass, etc., the best way to adapt to yourself is the best method, which is all explored by yourself in practice.

1. If it is directly soldered, there is generally a PCB copper foil connected to the single-chip base, and plugging in the single-chip microcomputer is equivalent to connecting to the single-chip microcomputer.

2. You can use assembly and c, for single-chip microcomputer, what is needed is the compiled program, what language is used before compilation, it has nothing to do with it.

3. Find the manual, which is generally accompanied by electronic information, including schematic diagrams, PCB diagrams, etc., if you can't find it, you can only redraw the circuit diagram according to the PCB.

4. There seems to be a brand model on the kanban, and there may be corresponding information when you search on the Internet. Or ask the manufacturer to send you another information.

It's not external, the pin connection of the LCD has been connected to the microcontroller on the PCB, of course, these pins must be there.

Yes, otherwise how to control the liquid crystal.

If there is a metal circuit on the PCB, the SMD electronic components are connected in the circuit to realize the sprinkling.

There are two types of components: in-line and SMT.

Straight insertion is inserted into the PCB pad hole through the component pins, and then the pins of the solder pot patch are contact type, and the pads (solder points) correspond to the bottom of the chip component pins, and the electrical principle is the same as that of the plug-in, which is connected through the PCB copper foil. You estimate that you are looking at the computer motherboard, the computer motherboard is generally multi-layer (that is, there are at least 8-24 layers in the mezzanine of the PCB, and each layer can be embedded in the copper foil, so the advantage of doing this is that the surface components can be dense enough, and the connection of physical circuits (copper foil) is all done in the mezzanine.

I've written so much, I hope it will help you, add some points hehe.

It is still connected by the copper sheet in the PCB board.

How to connect the tact switch on the circuit board, in fact, this is not too difficult, how to connect the four pins of the tact power switch.

1. The digital multimeter is adjusted to the diode.

2. Accurately measure the two feet in the four corners to distinguish which 2 corners are open and which 2 are open.

3. Press the function key, accurately measure the two feet at random, and distinguish which 2 corners are open and which 2 corners are disconnected.

4. At the beginning of disconnection, the two pins of the function key can be used as two corners of electric welding.

I'll send you a tact switch soldering** is clear, the tact switch can be turned on and off with two pins, 4 pins are also two pins positive, two pins are negative, the following two switches on the PCB board specifications, ** by Shenzhen Dongao electronic switch **** answer, DHT-1101 and DHT 1101F:

In fact, it is very easy to understand, it is not as complicated as you think, 2 feet as a group, press down two feet to connect the other two feet. 2 feet in the same direction as a group.

The tact switch can be turned on and off by two pins, and the four pins are also two pins positive, and the two pins are negative

One. Basic concepts.

A tactile switch is an electronic switch that belongs to the category of electronic components.

Two. Structure.

Tact switches are divided into two categories: tact switches that use metal reeds as switch contact pieces, with small contact resistance and clusters of 20mn. It feels good and there is"Tick"Crisp sound.

Switches that utilize conductive rubber as a contact path are commonly known as conductive rubber switches. The switch feels good, but the contact resistance is large, generally in 100-300N. The structure of the tactile switch is to move down by the button, so that the contact reed or conductive rubber block contacts the solder plate to form a path.

The operating force of the tactile switch is related to the state in which the reed is located. The starting force is proportional to the distance of the reed compression when the reed is compressed to 5. % to 70% when the operating force suddenly decreases and is accompanied by"Tick"Sound.

There are generally two types of rubber switches for turtle guides. The operating force curve varies greatly depending on the geometry of the rubber block.

Relative humidity: <95%.

Rated voltage: 12V

Rated current: 50mA

Temperature: -25 70

The four pins are connected in two groups, which is actually equivalent to only two pins. It is easy to see that the two pins facing the wide side of the pin are connected, and they are the same pin. You can measure it with a multimeter.