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ASUS
SIM1 and SIM2 power supply and signal is separated, when the SIM holder does not recognize the SIM
card can
check the relevant circuit. Fault, not card analysis process is as follows:
1. The first SIM booth of welding and examine whether the pin height consistent.
2. Review the working voltage of SIM card 'VDDSIM' is normal.
3. Check the SIM card control signals' SIM_SCLK ', 'SIM_DA', lines is normal.
4. No problem with the above checks, the CPU is replaced.
2017-06-08
L3 Service Manual
ZD553KL
- 36 -
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