Have you been entangled in the failure analysis of the board for a long time? Have you spent a lot of effort on the prototype debugging process? Have you ever doubted your original correct design?
Maybe many hardware engineers have had similar psychological conversations. Data shows that 78% of hardware failures are caused by poor soldering and incorrect material patches. The engineers spent a lot of time and effort on the sample debugging and analysis, which delayed the progress of the project. If you can't find a bad cause at a time, the engineer will doubt his original correct design, causing him to stray into the wrong direction of thinking. When actually doing hardware debugging, engineers tend to consider many high-level potential incentives, but they are not willing to doubt whether the welding is reliable enough, but often "the safest place is the most dangerous place." Engineers will habitually believe that such simple things as welding will not cause many seemingly complicated problems. Once such problems occur, they will habitually consider the robustness of the software and the rationality of the design of the hardware circuit. such as,
Case 1, due to the virtual welding of a certain signal in the DDR high-speed signal part, the system seems to work normally when transmitting a small amount of data. However, when doing large-volume burst operations, such as high-definition movie playback, operating system loading, It will often give an error. It is often mistaken for software reasons, and software engineers have no chance to look at the code for a long time.
Case 2, due to improper control of time and temperature during soldering, the plastic structure inside the connector such as LCD and USB melts and deforms due to high temperature, causing a certain signal to be accidentally disconnected, so that the LCD has no display, USB has no communication, and is mistaken. Thought it was a software driver problem.
In the third case, a large number of decoupling capacitors are densely distributed next to the CPU power supply. Due to the excess solder in the soldering process, a certain capacitor is short-circuited. As a result, the hardware engineers spend a lot of time to check the cause of the short circuit one by one.
Case 4, high-speed signal interface connector, due to a certain signal virtual welding, the system can work at a lower bus frequency, once the bus speed is increased, the system immediately reports an error. The cause of such problems is basically difficult to locate.
In the fifth case, due to the poor soldering of the inductor part, the PWM dimming function of the LED failed, and the engineer spent a lot of time confirming whether it was a software or hardware problem.
Welding, seemingly simple, but there are also a lot of work details and steps pieced together, and these links are also interlocking with each other, any link error will lead to the final problem. China Southern Electronics Industry Association and Maxim Technology Massembly set up a service organization for professional sample patch welding in Shenzhen Nanshan High-tech Park, aiming to provide effective and reliable sample placement services for R&D electronic technology companies. Improve R&D and product launch speed. Its originality has been inserted into its own 3Q quality inspection link in the whole patch work process, point material, labeling, printing, patching, and over-furnace, which effectively reduces the possibility of hardware failure. Sex.
Therefore, in the hardware debugging process, it is recommended that engineers first observe the welding quality of your prototype. 1. Is the material correct? 2. Is the foot position correct? 3. Is there a case of continuous tin, empty welding, and virtual welding? Is the solder paste full and reflective after the furnace is over? 5. Is there any browning on the PCB? 6. Is the structural part of the connector melted at high temperature? 7. Does the chip position correspond to the silk screen?
After checking the above "shallow" project, put your energy on those "high-level" issues!
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