The Expert Mobile PCB Manufacturer in China

PCBMay- The Best Fit for Your Mobile PCB Needs

With our extensive know-how in the PCB industry, PCBMay is your partner for all your Mobile PCB needs. Mobile PCB assembly requires the best attention and care. You need to do business with a qualified, reliable manufacturer while staying on your budget.

Surely, PCBMay is your go-to for all your Mobile PCB needs! This is because we offer affordable, but excellent quality Mobile PCBs. We understand how important good value PCB products are for you. By partnering from us, you will drive your business to success.

The growth in the mobile devices industry is rising, and will continue to rise. Hence, it is important that your Mobile PCB manufacturer conducts:

• Professional PCB artist software design
• Sound visual and microscope test
• Thorough in-circuit tests
• Automated Optical Inspection (AOI)
• Checks using high-resolution cameras

You can rest assured that PCBMay follows these steps and more!

We make sure to check if your specifications are correct by giving you a detailed Work-in-Progress (WIP) report. In case there are any complaints, we will immediately   answer with a full 8D quality report. As you can see, your satisfaction is 100% guaranteed with PCBMay.

You will find it easy to communicate with us. You can place an order any time it is convenient with you, as we have sales personnel available 24/4 in case you call or message. You can also email us or chat us – we will respond immediately.

Any questions with your order will be handled professionally. We prioritize our customer’s happiness above all else.

So, what are you waiting for? Skyrocket your mobile PCB business! Order Mobile PCBs from us now!

Mobile PCB: The Ultimate FAQ Guide

Mobile phones are a revolutionary invention of the modern telecommunication system. The tiny compact mobile set can be possible only for the development of Mobile PCB. Also, they are improving day by day and offer more and more features and services.

PCBMay have been manufacturing all kinds of mobile circuit boards, maintaining the highest quality, and ensuring customer satisfaction.

What Is A Mobile PCB?

Mobile PCB is a small circuit board that is designed for analog-to-digital and digital-to-analog conversion of mobile phones. A Mobile PCB board is constructed by the combination of necessary computer chips.

So that they can convert the analog audio signal into a digital signal. Again, they change the converted digital signal of mobile phones into analog.

Mobile PCB

How Mobile PCBs Are Made?

Like other circuit boards, Mobile PCBs are constructed by Printed Circuit Boards materials such as copper is conductive material with polytetrafluoroethylene, fiberglass reinforced epoxy.

Several steps have been done for making printed circuit boards for mobile. Here are the steps-

Step 1 – Circuit Design

First, make the blueprint of the circuit design along with a mobile charger diagram. For this, use software and trance-wide calculators.

Step 2 – Print The Diagram

The next step is to print out the circuit diagram using a plotted printer. That print copy will show the details about Mobile PCB layers and components. Clear ink means non-conductive areas where the inked part shows the conductive copper trances.

Step 3 – Construct The Structure

In this part, the physical construction starts. The substrate carries the necessary components of the circuit structure. They are formed through oven heat to be secured. Copper layers are etched in this step.

Step 4 – Components Alignment

After alignment of the tracks and components of inner and outer layers, now time to laminate under UV rays. The board needs to be washed in an alkaline solution to clean the excess photoresist. Also, remove the unwanted copper.

Step 5 – Layer Interconnection

Then the clean layers are inspected. The holes are drilled in this step that creates a connection to inner and outer layers.

Mobile Circuit Board Etching

Step 6 – Fusing

Now the board forms a shape by fusing. After that, the laminating process begins. Then the prepreg layer goes under the substrate, copper foil, and PCB resin. After that, the copper layer is applied. Pins are punched on the layers to press them together.

Step 7 – Plating

After that, they are ready for plating. The fused layers are passed through a chemical solution. These will create a cote panel with thin copper conductive layers.

Step 8 – Planting

Now it’s time to plant the mobile circuit board. A thin tin guard is applied to the circuit. That will protect the inner copper layers.

Step 9 – Apply Solder Mask

After plating and planting, again eating is processed. Then apply an epoxy solder mask film on the circuit board.

Step 10 – Place SilkScreen

One of the crucial steps is silkscreen the circuit. The critical and essential lines are placed on the board. After that, coated with a soldering coat finish to enhance the quality of the circuit

How Does A Mobile PCB Work?

The mobile phone PCB is considered the brain of the smartphone. This circuit operated the entire functionalities and operations. Not a single component works behind the functionalities. Several components work combined in the mobile circuit diagram. Have a look-

Computer Chips

We already mentioned the mobile phone PCB diagram is designed with few computer chips. The role of computer chips is to convert the analog-to-digital signal and vice versa.

When analog audio signals go from an analog device, they convert the signals into digital.

Again, do the opposite conversion that is from digital to analog.

Moreover, the digital signal processor of the mobile circuit board did both compression and decompression of audio signals. And you may wonder, the capacity is 40MIPS. Which can continuously convert 40 Million instructions per seconds signals analog to digital and digital to analog every second.

Computer Chips

Flash Memory and ROM Chips

In mobile circuit boards, flash memory and ROM chips are placed for the storage location of smartphones. The capacity varies from device to device and also can be customized.

Again, the radio frequency and power sections are served for the power management and mobile phone charging system. Though the flash memory and ROM chips are absent in the mobile charger PCB diagram. These both control and operate various FM channels where RF amplifiers help the signal go in and out of the antennae.

Microprocessor

The other crucial element of Mobile PCB that works for mainly consumers. The microprocessor(CPU) operates and checks mobile tasks which are performed by the keyboard and display area. Also, deal with the control signals as well as command operations. So that, user can easily understand and use the keyboard’s functionalities.

Watch the video to learn more about Mobile Circuit Board –

How Many Layers Are Used To Construct Mobile PCB?

Mobile PCBs are usually multilayers that may contain 2 or more laminating conductive layers. The number of layers depends on the device requirements. To construct a smartphone PCB diagram, up to 12 layers can be used.

Now you may ask why single layers are not used in smartphones? Well, single-layer PCBs are useful for simple applications. To integrate with complex applications, multi-layer printed circuit boards are suitable. They have enough capabilities to deal with and fulfill the requirements of the application.

Multilayer Printed Circuit Board

Besides providing several noteworthy benefits that single PCBs don’t. For example, mobile circuit boards are more flexible, smaller in size, and light-weighted. Also, they are capable of operating functions as well as increase the performance of the overall mobile.

What Are The Advantages Of Mobile PCB?

The advantages of Mobile PCB can’t be described in one word. Here are the key benefits of mobile circuit boards-

1. For using a multilayer circuit, increase the functionalities and capabilities
2. The Mobile PCB is very small compared to other devices’ circuits. It’s more compact and lightweight
3. Provides higher mechanical strength so that the performance won’t degrade
4. Halogen-free Dupont layered Mobile PCBs are environment friendly.
5. Ensures higher reliability to satisfy consumers
6. More thermal resistance capacity
7. Easy to store and maintain due to having a mobile PCB holder.

High Performance Mobile Circuit Board

Are There Any Limitations Of Mobile PCB?

Besides a lot of benefits, the common drawback is sometimes Mobile PCB may cause thermal shock.

Thermal Shock Of Mobile Circuit

What Are The Requirements For Designing Mobile PCBs?

Designing the mobile circuit especially the android Mobile PCB diagram is challenging initially. Now it’s not too hard if you know the requirements. PCBMay offers customization in the designing of mobile circuit boards. The main requirements of designing Mobile PCB are as follows-

Multilayer PCB Fabrication

Laminating the multilayer PCB is the 1st requirement. During manufacturing time The multilayer circuit board for mobile phones is fabricated by a subtractive process. Layers are in between 2 to 12 and they are interconnected by the laminations, electroless copper, copper plating, and mechanical drilling.

And then time to fabricate the solder mask. The colors are different for different purposes like green, orange, etc. With a solder mask, solder coating and silkscreen are placed on the circuit board.

Use BUM Technology

During the subtractive process for double layer or multilayer circuit boards, the lead finish is applied as an insulating dielectric on both chemical plating and electrical plating through the holes. This is called BUM technology for manufacturing Mobile PCB. This process is repeatedly run until the circuit layer lamination is fully finished.

Smartphones require small and thin circuit board diagrams. BUM technology makes the PCB thin with higher density. Also keeps the trace space and width lower. For IC-grade high-density packaging, this efficient method is used.

Place Fiducial Marks

Another must-have requirement is the mobile phone PCBs have at least 2 fiducial marks. In phone circuits, the spaces are placed very carefully to arrange flexibility.

The diameter should be 1mm contrasting between the environment and solder mask materials color. If the estate is limited, the solder mask size could be customized as 0.5 mm.

In addition, the fiducial marks should have the same background to make them compatible with copper coating.

Fiducial Marks Of Mobile PCB

Design The Panel

After these, the final requirement is designing the panel of the Mobile PCB. The panel may be double-sided on long slit hole panels.

• Double-Side V-Groove Panel

A double-side v-groove panel is more suitable for designing Mobile PCB at a lower cost. Or need to repair them after breaking up. This method works like the neat margin for Mobile circuit boards. The technique is to apply 30 degrees with ⅓ or ¼ of the total circuit thickness. If the ICs with BGA or QFN packages are installed in the device, this method is not appropriate for the application.

• Long-Slot Hole Plus Circular Hole

If the Mobile PCB has more than 4 layers then the LCD board, SIM, and TF cardboard button boards are fabricated by this technique. The Long-slot hole plus circular holes are applied according to the daughterboard’s shape and figure and applied to the irregular or arc shape.

With the development of the properties of smartphones like miniaturization, multifunctions, intelligence, reliability, etc this method is useful and efficient.

What Problem Comes When Mobile PCBs Tracks Are Broken?

Printed circuit boards have copper conductor lines which are known as PCB traces or tracks. They are the conductive path to pass signals through the circuit board surface. When electricity passes through tracks, a significant amount of heat is produced.

This is one of the reasons for tracks being broken or burnt. Some other factors like excess pressure, Improper component spacing, lightning strikes, severe power surges or shorts, dirt, and carelessness are also responsible for line disconnecting of PCB.

When a track is broken, it affects the functionalities of the Mobile PCB. Sometimes, breaking tracks can stop the total operations of mobile phones.

How Do We Know The Mobile PCB Track Is Broken?

If the mobile phone is not working properly, the common problem behind it is the broken track of the internal circuit boards. There are some other reasons like Chemical Leakage, Electromagnetic Issues, Missing Solder Mask Between Pads, or even defeat in the mobile charger PCB diagram that can cause the malfunction of the device.

Even the broken tracks are not visible to the naked eyes. Then what is the way to know if the Mobile PCB track is broken or not?

Well, the “Line Checking” method is used in the telecommunication industry to find out the broken tracks. The mobile circuit board should have 7 to 10 layers for this checking system. For this technique, the following tools will be needed-

• Analog/Digital multimeter
• Desoldering station
• Soldering gun
• Magnifying glass

Copper Tracks Of Mobile Circuit

The steps of Line checking are as follows-

Step 1 – Visual Inspection

Start with a Visual Inspection, find out anywhere the Mobile PCB board is getting burnt or melted.

Step 2 – Power Module Checking

Then check the power module. For this, you need to check the input and output voltage regulator to give the regular value or not.

Step 3 – I/O Ports Checking

Next step is to check the Input/Output Ports. The damage in I/O ports is also the reason for the malfunction of the mobile phone.

Step 4 – Communication Ports Checking

Check the Communication Ports whether the lines are connected properly or not.

By checking these modules, you will find out whether the PCB tracks are broken or not. If you find the lines are separated for burning, melting, or other reasons, immediately repair them.

Our company PCBMay provides great services for only manufacturing PCB boards but also repairing them effectively.

Is There Any Difference Between Mobile PCB And Telephone PCB?

Besides, the Mobile PCB is compact, thin, repairable, and consists of more layers than The Mobile PCB and telephone PCB have differences. The mobile works by radio frequency where the telephone is operated by cable.

So the arrangement and placement of components, their properties, number of tracks, layers, fabrication processes are quite different for them.

In telephone printed circuit boards, there is a metal disk known as the diaphragm. That converts the sound waves into electrical energy. This electrical energy goes through the telephone cables and is again converted into sound waves, Which can be heard by the receiver person.

On the other hand, the printed circuit board of a mobile has computer chips. This circuit board is also regarded as a mini-computer for its features and capabilities. Which are higher than the telephone circuit.

Mobile circuit boards convert the audio analog and audio signal into digital. The digital signals pass as radio waves that can catch another mobile. The receiver mobile circuit is converted into an analog signal again, And people can hear it then.

Mobile Charger Circuit Board

What Are The Components Of Mobile PCB?

Various components are used to construct Mobile PCB based on the device requirements. Mobile PCB components are-

• Antenna Point
• Antenna Switch
• Power Frequency Oscillator
• Network IC
• Power IC
• Central Processing Unit
• Flash IC
• Logic IC
• Charging IC
• Audio IC

Mobile PCB Components

How To Repair The Mobile PCB?

Mobile PCBs can be damaged for many reasons. After identifying, they can repair them by following steps-

• Fix the surface to remove the damaged parts
• Then clean the copper tracks to remove tracks
• On the track, put copper tape
• Restore the circuit by the holes
• Again place the circuit solder and components
• Cut out the extra copper tape from the repair place

What Is The Standard Thickness For Mobile PCB?

Mobile circuit boards are usually multilayers. The standard Mobile PCB thickness is 1.57 mm or around 0.061 inches. For 8 to 10 layers PCB, the thickness range will be 0.062, 0.093, and 0.125 inches.

Again the 12 layers PCB circuit has 1.6 mm boards. It doesn’t mean that more layers of PCB make it thicker. The PCB manufacturer optimizes and maintains the standard thickness whatever the layers are.

Again the strand thickness of PCB traces is between 7 to 12 mil range depending on the application requirements.

Mobile PCB Thickness

What Is The Highest Heat Resistance Capacity Of A Mobile PCB?

Mobile PCBs are high-temperature PCBs, they have to work for multiple functions. The Mobile PCB is constructed by polyimide flex laminate systems though it has the capacity level. The highest temperature withstanding capacity is 150 degrees Fahrenheit.

More temperature may cause melting and breaking the tracks of the internal circuit. So far, the mobile will not work properly, the keyboard and screen fail to interact. Again the solder melting point temperature is around 360 to 370 degrees Fahrenheit. Thus low temperature is useful for operating the mobile properly.

High Temperature Mobile Circuit

What Are The Differences Between Mobile PCB And Remote PCB?

Mobile PCB is worked by converting signals analog to digital and vice versa. They are made of copper conductive layers. The computer chips combined work behind the functionalities of mobile circuits.

Where the remote printed circuit board has an infrared LED along with another PCB component. The circuit LED interacts and sends a signal to the receiver device. And the receiver operates according to the radio signal. For example, tv remote, remote control car, drone, etc.

High Density Mobile PCB

Another main difference between mobile and remote PCB is the distance. Mobile PCB is so powerful that it can transfer and receive signals from any corner of the world by radio frequencies. Where remote PCB can work only a limited distance.

Does Mobile PCB Contain Gold?

To fabricate Mobile PCB, a certain amount of gold is used. It may vary from device to device, android, or IOs operating system. Approximately 140 to 700g of gold is used in mobile phone circuit diagrams.

Gold has an efficient conductive capability. Also can carry a little amount of current. These properties are essential for smartphones. For these reasons, gold is used along with copper and other PCB materials.

Gold Finished Mobile PCB

What Are The Main Characteristics Of Mobile PCB?

Mobile PCBs have some significant characteristics that make the device unique and user-friendly to all. Have to look at the main characteristics of Mobile PCB-

Intelligentization

Mobile circuit boards feature intelligence such as a voice assistant, improving photo quality, GPS, etc. That can interact with people and machines.

Miniaturization

The circuit size is getting smaller day by day. That makes the mobile phone compact and lightweight.

Multifunctions

Mobile phone circuits can operate and control multiple functions at a time. The mobile circuit diagram and components are developed in such a way to deal with several services wherever the consumer wants.

Which Storage Conditions Need For The Long Life Of A Mobile PCB?

Let’s have a look at the storage conditions that are needed for the long life of Mobile PCB-

1. Store the circuit board with the company’s original packaging
2. The temperature of the storage place should be between 4 to 29 degrees centigrade
3. Strictly forbidden to keep in the refrigerator below 4-degree centigrade temperature
4. The storage room humidity should not be more than 70%
5. Clean them regularly by Mobile PCB cleaner
6. Don’t put anything heavy on the mobile circuit board
7. Use Mobile PCB stand to keep them in or

Mobile PCB Cleaner

What Are The Safe Handling Requirements For Mobile PCB?

Several components and materials are used for fabricating Mobile PCBs under heat and pressure. You should keep yourself protected and maintain some safety standards.

That will prevent the possibility of illness or any other diseases for the conduct of PCB materials.

Washing hands

Some ingredients are harmful to your skin. It’s better to practice using hand gloves when preparing and storing circuit boards. If somehow you did these without gloves, wash your hands properly after the laminating process.

Safety Equipment

During the manufacturing of Mobile PCB, high radiation can happen. You should wear safety glasses, an apron and hand gloves. These save you from direct conduct of sharp edges of metal, heat, and chemicals.

Room ventilation

The room or fabrication place should have a proper ventilation facility keeping sufficient temperature. Any dark, gloomy room may hamper the manufacturing process of Mobile PCB.

Is It Possible To Custom Laminate On Mobile PCB?

Mobile PCBs are multilayer circuits, so custom laminates can be done on them. Usually, mobile circuit laminates are made by Polyimide for their mechanical, thermal, chemical, and electrical properties.

If your application is needed, you can customize the laminate type, materials, thickness, components, thermal properties as well. Also change the finish like Glossy, matte, metallic, solid color, textures, etc based on the device requirements.

Watch this video to learn more about the layering process of PCB

How To Choose The Best Manufacturer For Mobile PCB?

If you need a Mobile PCB assembly and telecommunication service, you should choose the appropriate manufacturer. To find out the best manufacturer, you should consider the following things

• Manufacturing process
• Total cost
• Type and quality of materials
• Layers and laination fabrication
• Packaging, storage and maintaining ability
• Services they provide on time

Obviously, choose the experience and high rated manufacturer company. For this, PCBMay has been serving for the past 15years with the highest customer satisfaction.

Conclusion

Now time to wrap up the content. PCBMay provides all types of services and consultancy about Mobile PCB. Mobile PCBs are compact, smaller, and intelligent enough to satisfy the customers. Hopefully, now you don’t have any confusion about the mobile phone circuits.