Most Complete: Light PCB Assembly

LED lighting is becoming more common in everyday life. Uetpcb participated in thousands of LED lighting projects by providing led light pcb as well as LED PCB assembly service.
As a professional led light pcb manufacturer, we have an advanced led pcb assembly machine and a professional pcb integrated led fabrication team. We are working hard to provide the best pcb led lighting assembly service.

What is Light PCB Assembly?

The technology of printed circuit boards is a useful tool in supporting LEDs. These sheets are made of fiberglass, metal, or other materials. And can connect electronic components. These boards are often referred to as LED lighting pcb assemblies and are critical to many LED applications.

Advantages of light pcb assembly

Low thermal emissions

This is by far one of the most important reasons for using China led pcb assembly.
The most conventional light sources or other light sources in the circuit have always had problems with heat dissipation. However, in the case of light pcb assembly , this is not a big problem. Many emerging technologies are combined with heat sinks that eliminate even a very small amount of heat. This in turn allows the entire circuit and other components to operate at relatively very low temperatures.

Low power consumption

Light pcb assembly also have a significant advantage in that they consume very little power. Because of this, LED bulbs are starting to become the new energy-efficient lights and are being widely promoted everywhere. In general, when one uses LEDs, the demand for electricity is reduced by as much as ten times compared to other lighting sources.

Lightweight construction

Light pcb assembly are lighter than traditional circuitry and designs.

Ease of manufacturing and integration

Manufacturing of technology is never an easy task. With a large number of components, arrays, etc., there is a lot of work going on in the background before your average technology reaches the end user. LED PCBs are fairly simple and easy to manufacture, while saving manufacturers money.

Light pcb assembly is largely dust and moisture resistant

While this in itself is not absolute, it is more durable and long-lasting than more traditional forms of circuitry and light sources. More specifically, they are ideal for outdoor use, where they are almost constantly exposed to dust and moisture.

Additionally, the structure can be made stronger by adding safety features and sealing systems to it.

Applications of Light PCB Assembly

The amazing combination of energy efficiency, cost effectiveness, and design flexibility that Light pcb assembly and related products provide makes them a well-recognized technology. The following applications can use the technology.


Light pcb assembly indicators are now used in telecom equipment because of its tremendous heat transfer capability. LEDs with aluminum will have a beneficial effect on the application.


Light pcb assembly can use in the transportation and aviation industries, as well as traffic lighting. There are also signal lights, highway tunnel lighting, and street lighting. LED PCS is used to indicate and provide interior lighting in airports and other aviation industries.
We can use an aluminum LED pcb assembly machine for automotive accessories such as indicators, brake lights, headlights, and other applications. Aluminum led pcb assembly machines would be suitable for the automotive industry because they offer characteristics such as durability and economy.

Computer and military

Computer and military

Light pcb assembly displays and indicators for computer applications are gaining huge popularity in the international market. This is thanks to the LEDs on aluminum printed circuit boards, as they effectively disperse heat. Manufacturers insert aluminum printed circuit boards into computer accessories, such as power supply units and central processing unit boards, to quickly transfer heat.
Printed circuit board


You can find LED pcb assembly machine tools for the medical industry, including operating rooms in hospitals, where doctors perform physical examinations on patients and perform surgery. Aluminum printed circuit boards are extremely thermally-rotating, which ensures the proper functioning of medical equipment for all patients.

How to remove smd led from pcb

Problems and solutions encountered in light PCB assembly

pcb First Article Inspection

Control current in light PCB assembly

Light pcb assembly has the advantages of high illumination, long life, stability, and low energy consumption.
But the technology has a downside that greatly reduces its efficiency – custom LED circuit boards tend to generate high levels of heat. As a result, the system cannot be cooled efficiently by conventional means.
Custom pcb led lighting assembly use metal-core PCBs because they are highly efficient at solving problems associated with heat dissipation.
When your lighting system emits a lot of energy, you can damage the connected accessories. For example, Light pcb assembly in an aquarium can emit heat into your waters, causing your pet to boil. LED PCB assembly solves all of these problems, making LED lighting technology flawless.
identification of circuit board components

Solder LED components in pcb led lighting assembly

One of the things that need proper control or attention when performing light PCB assembly is soldering the components. In order for LED lamps to work efficiently and be as durable as possible, it is important to ensure that they are soldered to the correct base. A ceramic plate is the most efficient because it minimizes heating.
When you need Light pcb assembly, you need to consider.
  1. Solder bridges: When you make an accidental connection while soldering, it may lead to a short circuit.
  2. Soldering may also occur when the component is warping.
  3. You want to make sure that your solder head is clean and tidy so you can create a good joint. This will allow you to use enough heat induction when soldering.
  4. Begin by soldering the smaller parts, then moving on to the larger components. It allows you to quickly assemble the PCB.
single sided pcb

Light pcb assembly material selection

Typically, the functionality, maneuverability, and lifecycle of a PCB make LED lights dependent on its construction. Therefore, the list of materials you choose for the board can bury or improve the quality and efficiency of the entire system.
PCB manufacturers can use many products to create boards that are consistently efficient.
These include substrates, laminates, and different types of boards. It is important to note that a single material can cause a board’s functionality to be ruined if it is placed in an incorrect place. This is why material selection remains a major issue in LED PCB assemblies.
metal core pcb

LED PCB assembly with aluminum substrates

1. Aluminum substrate increases the stability of the PCB. Just because the heat transfer is better than other materials, it will not affect other parts.
2. Aluminum is strong and durable and can withstand high temperatures.
3. In addition to being durable, aluminum is lightweight and more comfortable to handle and even transport.
4. Compared to many other panels, aluminum is cheaper. It is also recyclable and therefore environmentally friendly.
5. Aluminum has better heat transfer capability and therefore can work at low temperatures, thus ensuring a longer working time. Aluminum will extend the life of the PCB.
6. When using aluminum, heat moves faster. Thus, it functions more efficiently and does not exceed the temperature specified for it.

Printed circuit board

Embedded pcb led lighting assembly

In small and thin electronic products for custom LED PCB assembly, this is the most suitable for the use of embedded LED PCB. The pcb led lighting assembly is suitable for medical equipment, low-light environment, as well as some aviation and marine equipment. The following are some of the benefits of using embedded pcb led lighting assembly.
1. Light pcb assembly are dust and even moisture resistant
2. They are lightweight and less noticeable
3. LED pcb assembly is available in a choice of colors, sizes, and light intensities
4. Light pcb assembly has a lower backlight coating and membrane switches
5. They consume less power and are therefore very energy efficient
6. PCB led lighting assembly works better on silver and copper flexible membrane switches.

blank sided pcb

Single point, surface mount and integrated LED

These are lighting pcb assembly that are designed by the manufacturer so they can meet the user’s specifications. They are available in a variety of sizes and colors. These LEDs can be placed in any area. They can also create colors and reduce the size of the produced light. Each one of these lights has its advantages and disadvantages.
1. Light source optimization
2. Fixture has added value
3. much easier to make new designs when dealing with integrated LEDs
1. They have an expiration date
2. They can be difficult to replace
3. Most of them do not have solid warranty coverage

Light PCB Assembly Specifications

1. Number of layers

These layers consist of aluminum and magnesium.

2. Types of layers

Usually, the base layer is made of aluminum alloy metal. Aluminum alloy substrates used to make the base are ideal for through-hole technology for transfer and heat dissipation. The thermal barrier is made using some ceramic polymers with good viscoelastic properties.

3. The number of flexible PCBs

Flexible PCBs can be single-layer or multi-layer PCBs. Devices that require high-speed execution are ideal for multi-layer flexible PCBs.

4. Size

Layers Max Size & Min Size
1-2 layers 59”x50” 0.2”x0.2.”
4-6 layers 32”x28” 0.4”x0.4.”
8-20 layers 30”x24” 0.4”x0.4.”
The size of the PCB is critical. Because the manufacturing cost of the board is dependent on its size and layout,

5. Substrate

Engineers can specify PCB coating materials, PCB dimensions, and various other specifications that may be included.
Commonly used materials for PCB bases are:
FR-4 and epoxy – FR-4 is a very poor conductors of heat
Metal-core- is also the material used at the bottom of the LED PCB.
Fr-4 uses for low thermal equipment, while Metal-core uses for equipment with high thermal quality.

6. Minimum spacing

The distance between components of an LED PCB should be equal to the height. A component measuring 0.05 inches should be placed 0.05 inches closer to its next component. This spacing is useful for inspecting solder joints and other PCB components. Surface mount technology uses a minimum space width of 0.006 inches.

7. Hole size

When making printed circuit boards, the aperture is an important aspect to consider. It is important to know the ratio between the thickness of the plate and the diameter of your drilled hole. This ratio is known as the PCB aspect ratio. A 3:1 aspect ratio means that the PCB’s thickness is 24mil and the drill holes’ diameter is 8mil. Board sizes between 8mils and 10mils can have a minimum aperture of 6mils.

8. Solder mask

It is also known as solder mask coating. It creates a thin layer of copper over it and helps to ensure the reliability and high performance of the PCB.

9. Silkscreen

Information that needs to be included on the silkscreen includes the switch settings and the logo of the device manufacturing company. It also displays the identifications of the components, test points, and a number of different versions.
Silkscreen method
Manual screen printing can be done when the line width is greater than 7mil. It must also have a registered tolerance (of 5mil) Liquid photo image is used when the image line width exceeds 4mm.

10. Connectors

Connectors on the edge of China  LED PCB assembly are a surface finish that provides a flat surface. The flat surface is very useful as it provides resistance to any tearing or abrasion due to repeated insertion. It is usually applied to areas of the PCB that are more prone to tearing and abrasion. For example, edge connectors and keyboards.

11. Ribs

Flexible PCBs sometimes require certain circuit board components to be rigid. This is where stiffeners can come in handy to support certain components on a printed circuit board. Rib thickness typically ranges from 0.008” to 0.59”. The thicker the rib, the more support it provides to the PCB assembly.

12. LED PCB assembly surface treatment

Choosing a good LED PCB assembly surface finish is critical as it is the finish that protects the copper from corrosion. The surface finish enables the PCB to have its components soldered directly to the board.

Light PCB Assembly Process


Step 1: Design and Output

The circuit board must be compatible with the PCB layout that was created by the PCB designer. Altium Designer, Or CAD, and Pads are all common PCB design programs. Almost all PCB Fab Houses conduct a Design for Manufacturing check to ensure the design meets the required tolerances before it is made.
pcb Normally AOI inspection

Step 2: From movie to file

After the PCB designer has exported the PCB schematic file, and the manufacturer has done a DFM inspection, PCB printing can begin. To print the board, the manufacturer uses a special printer known as a plotter. This makes photo films of the printed PCB. All films should have holes punched to ensure perfect alignment. Adjusting the table where the film is placed determines the accuracy of the holes. When the table is in the right alignment, holes are punched. These holes do use to position the pins in the next stage of the imaging process.

Aluminum PCB

Step 3: Print the inner layer

The previous step of the film creation did aim at drawing out the graphics of the copper path. Now it’s time to print the graphics from the film onto the copper foil. In PCB construction, cleanliness is really important. The copper-faced laminate is cleaned and put into a purged environment. At this stage, it is crucial that no dust particles are deposited on the laminate. Otherwise, errant dirt specks may cause circuits to short or remain open.


Steps 4: Remove unwanted copper

After removing the photoresist and covering the hardened resist with the copper we wish to retain, the board moves on to the next stage: removing the unwanted copper. After the copper is removed by the solvent, the copper-resistant hardening resist must be removed. Another solvent can accomplish this task. The board now shines only on the copper substrate required for the PCB.
Wave Soldering in PCBA Assembly Process

Step 5: Layer alignment & optical inspection

Once all layers are cleaned up and ready to go you will need to align them all. Alignment holes align the inner layers with the outer layers. The technician places these layers into a machine called an optical punch, which allows for precise correspondence to accurately punch the alignment holes.

Printed circuit board

Step 6: Layering and gluing

At this stage, the board is formed. All individual layers are waiting for their union.
Printed circuit board

Step 7: Drilling

To find the location of the drill target, the X-ray locator identifies the correct drill target point. The appropriate alignment holes are then drilled to hold the stack for a series of more specific holes. Once the drilling is complete, additional copper lines at the edge of the production panel are removed with a contouring tool.


Step 8: Copper Deposition and Plating

The panel is then ready for plating after drilling the holes. The chemical deposition process deposits approximately 1 micron thick copper on the panel’s surface.
Printed circuit board MACHINE

Step 9: Outer layer imaging

Step 3: We apply the photoresist on the panel. This step is similar to the previous one except that we now image the outer panel with the PCB design. To prevent contaminants adhering to the surface of the layer, we first place the panel in a sterile chamber. Next, we apply a layer with photoresist.
This is the reverse of the inner layer. Next, the outer plate must be examined to ensure that there is no photoresist.

Printed circuit board

Step 10: Plating

We plated a thin copper layer on the panel, just as we did in step 8. Copper plating uses the exposed part of the panel in the external photoresist step. Tin plating can appliy to the board after the copper plating bath. This allows the board to remove any copper that has remained. Tin protects the portion of the panel that will later be coated with copper. The unwanted copper foil is removed by etching.
pcb production

Step 11: Final Etching

This stage removes any copper experiences and unwanted copper exposed below the resist layer. Now, the conductive areas and connections have been properly established.
PCB productin

Step 12: Apply Solder Resistant

The panel must clean before the solder resist is applied to both sides. The UV light will direct at the board through the solder resist photographic film. The remaining covered area will not harden and will remove. The board is then placed in the oven to cure any solder resist.

Requirements for coating A Coating thickness coating film thickness control in 0 05mm 0 15mm Dry film thickness 25um 40um B Secondary coating In order to ensure the thickness of products with high protection requirements, secondary coating can be carried out after the film is fixed whether to carry out secondary coating according to the demand shall be determined

Step 13: Surface treatment

We chemically plat the PCBs with silver or gold to increase solderability. Some PCBs are also subject to hot-air leveling. Hot air leveling results in uniform pads. Achieving light pcb surface finish by LED PCB assembly process. UETPCB can apply a variety of surface finishes to meet customer requirements.

PCB production

Step 14: Silkscreen

Inkjet writing is applied to the surface of the almost-finished board to indicate any information about the Light PCB assembly. This allows the PCB to enter the final coating and curing stages.
pcb production

Step 15: Electric Testing

Technicians use mobile probes as a last resort to check the electrical performance of each network using bare circuit boards.

Step 16: Analysis and Scoring

Packaging LED PCB after Assembly. Types of Light PCB assembly packaging:

  1. Lamp-LED
  2. Surface Mount Device-LED
  3. Side-LED
  4. Top-LED
  5. High power-LED
  6. Flip chip-LED

Why choose us as your China led pcb assembly companies

Our experience with China LED PCB assembly is extensively using the best LED chips like Osram, Samsung, and LG. End applications include horticulture and vehicle, as well as lighting for entertainment, architecture, entertainment, and high-end portable applications. Our Light PCB assembly team has created procedures that allow for the assembly of all LEDs.
Many thousands of electronic engineers have entrusted their projects to start-ups, from LED bulbs for consumer use to medical LED lights.We can help you with everything from commercial flood LEDs to industrial high power LEDs, from automotive LEDs to military LEDs, UETPCB is the perfect place for your Light PCB assembly requirements.
For China led PCB assembly quotes, contact us now – The best China led pcb assembly factory.

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