The multimeter can not directly detect the quality of the memory chip, because the circuit structure of the memory chip is relatively complex, and professional equipment is required for testing and analysis. However, we can detect some memory chip related circuit components through a multimeter to determine whether the electrical connection between the chip and other parts is reliable. Here are some specific steps:
1. Check whether the power supply of the memory module is normal. In DC voltage measurement mode, connect the red probe of the multimeter to the power supply pin of the memory module (for example, VDD) and the black probe to the ground pin of the memory module (for example, VSS). The power supply voltage (e.g. 3.3V) that matches the memory module should be measured. If the voltage is too high or too low, there is a power problem.
2. Measure the electrical connection between the memory module and the mainboard by connecting the red probe of the multimeter to the signal pin on the memory module and the black probe to the corresponding pin on the mainboard. Check that the connection between each pin is intact by testing multiple pins in succession. You can use the short-circuit detection function of the multimeter to determine whether the circuit connection is smooth.
3. Check whether the memory unit of the memory chip is damaged. In the resistance measurement mode of the multimeter, select x1 or x10 and connect the probes of the multimeter to the pins of the memory unit to be detected. If a resistance value approaching infinity is measured, the storage unit is damaged or fails.
4. Detect the timing control circuit of the memory chip: in the frequency measurement mode of the multimeter, connect it to the timing pin of the chip, and check whether the frequency and duty cycle of the clock signal output by the pin are normal. If the output is wrong, the timing control circuit may fail.
It should be noted that before performing the above detection operations, it is necessary to understand the internal circuit structure and pin definition of the chip in advance to avoid misjudgment and accidental injury.
Multimeter memory detection method motherboard to memory data pins are 64, D0--D63. In general, in order to protect the data pin of the memory, each data pin of D0--D63 is added with a small resistance value, which plays a current limiting role, and the resistance value is generally 10 ohMs left and right. The principle of the test is to detect each data foot of the memory chip, address foot, clock foot whether there is a short circuit, bad break and other phenomena with the diode block of the multimeter, the red pen is grounded, the black pen measures the resistance value of each bar resistance, that is, the resistance value of the data foot of the memory chip, generally the difference in the resistance of each foot is not large, if the difference is very large, there is a problem with the chip. In careful detection of which chip is the problem after replacement is generally good, with this method can also detect the quality of DDR memory chip.