msd6i981btc
Publish: 2021-04-17 03:14:40
1. 1、 Analysis and maintenance: the output voltage of 3.3V and 24V of the power board is normal, and it is judged that the main board is faulty. Measure the 12V voltage output point on the main board, and find that the voltage at this point is 24V
the main board's u803 (mp1593) and its peripheral circuits form a 12V voltage forming circuit, which converts the input + 24V voltage into DC-DC and reces the voltage to 12V. After checking that there is no abnormality in the peripheral components of u803, replace it and start the machine, and remove the fault
it is found that the grounding area of the integrated block is too small when replacing the u803. In order to prevent it from being damaged again, the grounding welding area of the u803 should be expanded
2. The 24 V and 3.3 V at the P100 socket on the main board are normal, and there is no backlight power on signal, which indicates that the main board has been turned on, the main chip U500 (msd6i981btc) does not work normally, and the measured voltage stabilized power supply is normal. The fault of mbootu502 (25q16) is still normal, and it can not be upgraded by using force software. Finally, it is suspected that U500 is damaged or poorly welded, After repair welding, remove the trouble.
the main board's u803 (mp1593) and its peripheral circuits form a 12V voltage forming circuit, which converts the input + 24V voltage into DC-DC and reces the voltage to 12V. After checking that there is no abnormality in the peripheral components of u803, replace it and start the machine, and remove the fault
it is found that the grounding area of the integrated block is too small when replacing the u803. In order to prevent it from being damaged again, the grounding welding area of the u803 should be expanded
2. The 24 V and 3.3 V at the P100 socket on the main board are normal, and there is no backlight power on signal, which indicates that the main board has been turned on, the main chip U500 (msd6i981btc) does not work normally, and the measured voltage stabilized power supply is normal. The fault of mbootu502 (25q16) is still normal, and it can not be upgraded by using force software. Finally, it is suspected that U500 is damaged or poorly welded, After repair welding, remove the trouble.
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