When an SSD is subjected to severe drops, vibrations, or prolonged thermal stress, the physical connections beneath the volatile DRAM cache chip can crack or separate from the printed circuit board (PCB). Because the SSD controller relies on the DRAM cache to instantly access mapping tables, any disruption in this communication line causes the drive to lock up, display a "Busy" state, or fail to enumerate entirely. Inside our certified Class 100 ISO 5 clean room, technicians perform precision DRAM chip reflowing to restore these vital contacts.
Using high-magnification stereomicroscopes and programmable infrared rework stations, engineers apply a highly targeted thermal cycle to the DRAM chip. This process heats the exact zone to the liquefaction point of the solder without overheating adjacent, temperature-sensitive NAND flash memory cells. By carefully monitoring the surface tension of the liquefied solder, technicians ensure the microscopic Ball Grid Array (BGA) connections beneath the DRAM chip re-seat perfectly onto the circuit board pads, re-establishing seamless data pathways for the mapping directory.
