Asus ZS551KL Troubleshooting Manual - Page 10

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PC can't detect USB COMPORT. Check your device manager for COM Qualcomm

QDLoader 9008. If not, please check:

Check the power supply/battery (4.2V)

Make sure all fixture pins contact well, also check the connection of the IOFPC

and Sub board

If heavy current occurs when booting up, probe VBAT (T9603 or T9602) and

VPH_PWR (C2402.1 or C2402.1) and search for short circuits.

(1) VPH_PWR shorts to

NFC Power U5402, BL driver PU8901, Audio codec AU2601, Vibrator AMP

U2401.

If system shuts down before booting up, check MSM_RESIN_N (T8702) if the

TP is high (1.2V). Check which power in the PON sequence ended.

(2) VREG_S2A, S8A, S9A, S3C abnormal impedance:

MSM(U0201), PMIC(PU8401, PU9701) to search for short circuits. If not, try to

reheat or remount DDR.

1001 Provision check fail-DL

GND: X-ray check PMIC

PU9701 & PU8401 &

Check both DDR &

PU9001,