Service Manual
Description:
[1] The LED will flash green once if the terminal is powered on normally.
[2] The 3.3V and VBAT voltages are available for the MMI board.
[3] Check whether the connector for the LCD or MMI board is damaged or properly connected.
[4] Use a normal LCD to check whether the problem is caused by the LCD.
[5] The VOUT voltage at Pin8 is 5.5V if U7002 works normally.
[6] Check whether J7001 is damaged or shorted.
[7] The impedance between pins is about 90
.
[8] The VBAT voltage range is 3.6~4.2V.
[9] The VREFH voltage is 1.225V.
[10] Please refer to the test standard for current in the chapter “Tuning Description”.
[11] Compare with a normal board.
[12] The waveform is similar to square waveform corresponding to the frequency.
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