A welding detection system and method for circuit board with cpu

Abstract

The invention relates to a welding detection system and a welding detection method for a circuit board with a CPU (Central Processing Unit). The system comprises a PC (Personal Computer) equipped with debugging software, a circuit board for testing and a power supply, wherein the circuit board for testing is connected with the PC and a tested circuit board by an RS232 (Recommended Standard 232) and a JTAG (Joint Test Action Group) respectively. The method comprises the steps that when a test is started, a debugging program is downloaded into an RAM (Random Access Memory) or an ROM (Read Only Memory) of the CPU by the JTAG, and run by a sequence of address line detection, data line detection and address data line detection; detected data is judged; false welding of the tested circuit board or hanging in a chip, a short-circuited address line and a short-circuited data line are obtained by adopting different data processing methods respectively; in addition, whether the tested circuit board has the short-circuited address line, the short-circuited data line or the false welding is displayed at a serial terminal; and which one goes wrong particularly is provided. The system contributes to quickly detecting and positioning the circuit boards, improves the production efficiency, reduces the operation difficulty, is wide in application scope and has a promotion value.

Description

technical field [0001] The present invention relates to circuit board detection technology, in particular to a welding detection system and method for a circuit board with a CPU, specifically a system and method for detecting whether there is a welding failure on the circuit board and whether there is a problem with the chip . Background technique [0002] With the advancement of technology, today's electronic equipment is developing towards the goal of miniaturization and multifunctional functions. The miniaturization is due to the increasingly mature BGA packaging technology and smaller and smaller pin pitches. Functional diversification means that there are one or more processors on the circuit board, one or more data storage devices (such as NANDFLASH, SDRAM, DDRRAM) and some peripheral devices (such as network cards, XR16L788, etc.), such as figure 2 shown. The above-mentioned devices take the CPU as the core and perform data interaction through data address lines. S...

AI Technical Summary

Problems solved by technology

Since this type of chip has more address lines and data lines, there will be several pads on the circuit board. During the welding process, if one or more bits are soldered or short-circuited, the entire circuit board will not be usable. , due to the large number of pins, and most of the chip packages are BGA packages, the pins are invisible, which increases the difficulty of troubleshooting

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