1. Check the PWR_ON voltage of Power B/D and Main B/D connector
2. The normal power supply voltage from Main B/D to Power B/D is 3V or higher
3. If the result comes out ’NG, replace Main Board. If it comes out ‘OK’, replace Power B/D
4. The normal power supply from MAIN to POWER is 3V or higher
Note. 3 / 4
Note 3. How to measure PWR On
PWR_ON
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