Asus ZS551KL Troubleshooting Manual - Page 46
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SD/SIM card detection - ASSY
SMT problem are the main cause of SD card detection.
1.
Probe SD_CARD_DET (R2212.2) to check if it pulls high (1.8V) when tray is
inserted.
2.
Check U2201 for cracks, short circuits, SMT problems. Also check:
SD card:
CON2206,
squeezed and bending pins.
3.
X-ray to check all RLC components inside shielding U3002. If not, reheat the
shielding, and retry.
Tray insert detect pin state
CON2202, SIM card:
CON2204, CON2203, for any
Crack on U2201