Fuhjythy DDR2 and DDR3 2 in 1 Illuminated Tester with Light for Desktop Motherboard Integrated Circuits

If the LEDs all light up and the brightness are all the same, the signal is there is no problem The error can be detected by the LED light, indicating open circuit, short circuit, data line or address line Install the 3.3 v (CR2032) battery on the tester, motherboard does not need power on, on the tester's button By booting and reading the RAM Memory Slot Tester, it can indicate the error in the motherboard circuit for further repair Light out or weak light signals gives problem. You must refer to sign indication in addition to that LED light