Asus ZS551KL Troubleshooting Manual - Page 49
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There are two conditions of vibrator problems:
No vibration/ unusual vibration:
1.
Check whether both springs (U3305, U3304) contact well with the vibrator.
Please assemble again to double check the RF cables don't interfere with
the SUB board.
2.
Swap the vibrator to avoid NG parts.
3.
Check U2401 and nearby components if there are any cracks, or SMT
problems.
4.
R2408, R2409, and R2401 should be non-mounted. R2410 should be
mounted.
5.
Probe VIBRATOR_SHDN(R2410.1). It should pull high (1.8V) when vibration.