8. Level 3 Repair

8-1. Components Layout

Main board top view

Main board bot view

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8. Level 3 Repair

Sub board

Reference map

Mb top view

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8. Level 3 Repair

Mb bot view

Sub top view

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8. Level 3 Repair

Sub bot view

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8. Level 3 Repair

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8. Level 3 Repair

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8. Level 3 Repair

8-3. Flow chart of Troubleshooting.

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8. Level 3 Repair

8-4-1. Power On

:

Checking Power signal (LCM, PMU, Clock)

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8. Level 3 Repair

8-4-2. Charging

: The charging controlled by third charger chip

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8. Level 3 Repair

8-4-3. Audio speaker

: The Speaker control signals are generated by MT6357 (U701) and PA AW87319

(U3701), the chip, PA and the speaker are to be checked out.

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8. Level 3 Repair

8-4-4. Audio Main MIC

:

The MIC control signals are generated by PMU chip MT6357 (U701), the PMU

chip and the MIC are to be checked out.

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8. Level 3 Repair

8-4-5. Sub MIC

: The MIC control signals are generated by PMU chip MT6357 (U701), the PMU

chip and the MIC are to be checked out.

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8. Level 3 Repair

8-4-6. Accelerometer sensor

: The Accelerometer sensor is calibrated by using SW algorithm.

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8. Level 3 Repair

8-4-7. Proximity and light sensor

: Proximity (U4417) and Light Sensor (U4416) is worked as below:

Control the

screen’s on/off operation automatically while making phone calls, and adjust the

screen brightness according to ambient light.

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8. Level 3 Repair

8-4-8. TOUCH SCREEN AND DISPLAY

: The Touch control signals are generated by MT6762. It is assembled with LCD.

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8. Level 3 Repair

8-4-

9

. Vibrator

: The Vibrator control signals are generated by MT6357.

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8. Level 3 Repair

8-4-1

0

. Rear Camera

: The Camera control signals are generated by MT6762.

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8. Level 3 Repair

8-4-11. Front Camera

The Camera control signals are generated by MT6762.

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8. Level 3 Repair

8-4-12. Depth Camera

: The depth Camera control signals are generated by MT6762.

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8. Level 3 Repair

8-5. Service Schematics

- U101_MT6762_BB chip IC , Digital

Baseband Processo

r(Top)

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