Asus ZD553KL Service Manual page 49

ASUS
L3 Service Manual
FM failure analysis steps are as follows:
1. Check if the headphone plug is in good contact (if there is a headphone symbol display), whether
the wiring device is good for the welding line.
2. Check the FM module operating voltage is normal, such as abnormal replacement PMU.
3. Check whether XO_IN is normal,
3. Check that the U2900 output is normal with the CPU FM signal demodulation circuit "FM_DATA"
and "FM_SSBI".
2017-06-08
ZD553KL - 49 -