AOI circuit board,Automotive lighting PCB,Electronic assembly PCB,Socket terminal PCB-Shenzhen Weienchen Technology Co., Ltd.

Tel: +86-755-29662580

Email: sales@victoriapcb.com

current position: Home  》  News  》  FAQ

PCBA repair and rework process

source:FAQ release time:2021-04-26 Article author:Victoria Popular:pcb

1. The process purpose of PCBA repair and rework


① Solder joint defects such as open circuit, bridge, false solder and poor wetting generated in reflow soldering and wave soldering process need to be repaired manually with the necessary tools (such as: BGA rework station, X-ray, high-power microscope) Remove various solder joint defects to obtain qualified pcba solder joints.


②Repair the missing components.


③Replace the sticking position and damaged components.


④There are also some components that need to be replaced after the single board and the whole machine are debugged.


③Repair the whole machine after leaving the factory.

PCBA返修

Second, the solder joints that need to be repaired


The following describes how to determine the solder joints that need to be repaired.


(1) Electronic products should be positioned first


To determine what kind of solder joints need to be repaired, you should first locate the electronic product and determine which level of product the electronic product belongs to. Level 3


It is the highest requirement. If the product belongs to Level 3, it must be tested according to the highest standard, because the third level product is based on reliability as the main goal; if the product belongs to Level 1, it is fine to follow the lowest level standard.


(2) It is necessary to clarify the definition of "good solder joints".


Excellent SMT solder joints are those that can maintain electrical performance and mechanical strength in the use environment, method, and lifespan considered by the design.


Therefore, as long as this condition is met, there is no need to repair it.


(3) Measure with IPCA610E standard. It is not necessary to use the soldering iron to rework if the conditions of acceptable level 1 and 2 are met.


(4) Detect with IPC-A610E standard, defect level 1, 2, 3 must be repaired


(5) Test with IPCA610E standard. Process warning level 1 and 2 must be repaired.


Process warning 3 refers to conditions that do not meet the requirements. But it can also be used safely. therefore. General situation process alert


It shows that level 3 can be treated as acceptable level 1, and repairs are not required.


3. PCBA repair and rework process requirements In addition to meeting the requirements of 1. SMC/SMD manual soldering process, add the following ③ requirements. When disassembling SMD devices, you should wait until all pins are completely melted before removing the device. To prevent damage to the coplanarity of the device.


Four, rework precautions


①Do not damage the pad


②The availability of components. If it is double-sided welding, a component needs to be heated twice: if it is reworked once before leaving the factory, it needs to be heated twice (disassembly and welding each heat once): if it is repaired once after leaving the factory, it needs to be heated again twice. According to this calculation, it is required that a component should be able to withstand 6 times of high temperature welding to be considered a qualified product. Therefore, for high-reliability products, components that may be repaired once cannot be used again, otherwise reliability problems will occur


③The component surface and PCB surface must be flat.


④Imitate the process parameters in the production process as much as possible.


⑤Pay attention to the number of potential electrostatic discharge (ESD) hazards. ①The most important thing for rework is to follow the correct welding curve.


Read recommendations:

Network communication board (sixth floor)

Mobile phone template (six layers)

Six-layer Immersion Gold Board (BGA)

SMT stickers

What is a PCB and its composition?Tantalum capacitor PCB Wholesale

Previous:What is HDI circuit board? Back to list Next:Cleaning mechanism of solder joints in SMT processing

Online message

Popular recommended products

Related Information

PCB enterprises should pay attention to SMT matters.Electronic components PCB

2024-04-03

PCB - the core building block of electronic products.Automotive Electronics PCB

2024-03-25

PCB - the bridge and link of the electronic world

2024-03-18

How to define high-frequency and high-precision circuit boards.Industrial Electronics PCB

2024-03-11

USB PCB interface layout and wiring requirements

2024-01-22

Electrolytic capacitor PCB.Steps for using PCB pins

2024-01-15

Automotive ElectronicWhat aspects should be considered when processing and manufacturing PCB boards?

2024-01-08

Electrolytic capaciWhat is the difference between a gold-plated circuit board and a gold-plated one?

2023-12-25

When grinding PCB boards, attention should be paid to.Oscillator (belonging to crystal) PCB

2023-12-18

Industrial Electronics PCB!What precautions should be taken when copying and grinding PCB boards

2023-12-11

Do you know who is more suitable for LED direct display, regarding the difference between PCB board

2023-12-05

Aluminum electrolytic capacitor PCB.What are the standards for selecting PCB boards

2023-11-27

Surface Mount Technology (SMT) Phase PCB

2023-11-20

Oscillator (belonging to crystal) PCB.The main functions of PCB board

2023-11-13

What is the difference between RO filter and PCB filter

2023-11-06

Method for determining blind hole PCB board

2023-11-01

Electronic Manufacturing Services PCB!What are the effects of PCB board color on performance?

2023-10-23

Introduction to the Manufacturing Steps and Requirements of PCBA Test Stand

2023-10-16

PCB version maturity stage.AOI circuit board price

2023-09-25

How to maintain a PCB circuit board

2023-09-19

Development Trend of Printed Circuit Board.Zener diode PCB Vendor

2023-09-14

Common problems and cause analysis of PCB circuit board sampling.Zener diode PCB price

2023-09-08

What are the issues that need to be understood in PCB circuit board design?IGBT module PCB factory

2023-09-08

How to reduce the risk of bending and deformation in PCB circuit board production?Inverter PCB Produ

2023-08-16

What are the three main factors that constitute welding defects in PCB circuit boards?Multilayer PCB

2023-08-16

The structure of a glass teapot.LCD Module PCB factory

2023-08-11

Glass teapot.Inverter PCB Processing

2023-08-11

PCB online debugging

2023-08-08

PCB offline programming

2023-08-08

What are the precautions for PCB design?

2023-07-27