How to Measure Memory Chips Using a Multimeter
There are 64 data pins on the motherboard and memory, D0-D63, In order to protect the data bit pins of the memory, a resistor (10 ohms) with a different resistance value is added to all 64 data bit pins D0-D63 to limit the current. The main principle of the tester is to repeatedly test each data bit pin of the memory chip using a program, to see if there are any broken or short circuited data bit pins, as well as the clock pin and address pin of the chip.
So when testing chips with a multimeter, the method of a tester can also be used. As long as the red pen is connected to ground (pin 1) and the black pen measures the resistance of the discharge resistor, which is the resistance of the memory chip data bit, it can be used to determine which chip is broken. Normally, the resistance of each data bit is the same. But it is still not as intuitive as a tester, which can measure the quality of DDR memory chips using this method.
According to the user manual, the measured memory is in 2A and 2B, which refers to single group and double group. But there are 8 16 bit chips, which is equivalent to two groups, and 16 8-bit chips, which is equivalent to two groups.
2A is Group 1 , 2B is Group 2.
During measurement, the data bit pins of each chip in each group will be cyclically tested. Generally, if it doesn't break after 3 to 5 tests, it's good. A good chip is PASS. A faulty chip displays faulty data bit pins.
1. Unable to jump into the test during startup, usually due to chip short circuit or PCB board short circuit. The solution is to remove the chip and replace it with a good PCB board to test the quality of the chip and see what the problem is.
2. The memory tester does not test SPD chips, SPD chips are optional
3. If the golden finger burns, it cannot be tested. The chip must be removed and replaced on a good PCB board to test its quality
