Micromax X377 Bedienungsanleitung

X377 L3 Service Manual

A) Technical Specifications:

Particular

Remarks

Key Matrix For Flashing

N/A

Chipset

SC6531E

Android Version

Frequency

900/1800mHz

Network Mode

GSM

Rom

32Mbit

RAM

32Mbit

Internal SD Card memory

Expandable Memory

Support up 16 GB T card

Factory mode code

*#2020#

Good Earpiece volume

97Hz

Good Loudspeaker volume

89.5dB

Good MIC volume

-42db

Good Vibrator volume

170Hz

Engineering Code

*#346#

X377 L3 Service Manual

1 Main board explored overview..............................................................................................................3

2.1 Can’t download...................................................................................................................................5

2.2 Can’t power on................................................................................................................................... 6

2.3 Can’t getting charged......................................................................................................................... 7

2.4 LCD Display fail....................................................................................................................................8

2.5 Camera is not working........................................................................................................................9

2.6 RECEIVER is not working...................................................................................................................10

2.7 SPEAKER is not working.................................................................................................................... 11

2.8 MICPHONE is not working................................................................................................................ 12

2.9 VIBRATOR is not working..................................................................................................................13

2.10 FM is not working........................................................................................................................... 14

2.11 BT.................................................................................................................................................... 15

2.12 Can’t detect the SIM CARD............................................................................................................. 17

2.13 Can’t detect the TF CARD............................................................................................................... 18

2.14 RF Module................................................................................................................................... 19

X377 L3 Service Manual

1 Main board explored overview

Figure --top

LCM

Power key

X377 L3 Service Manual

TORCH 1 TORCH 2

SPEAKER

VIBRATOR

SIM2

SIM1

T/F SLOT

Charger

MOSFET

CPU RF PA

Battery

connector

BT Antenna

26MHz

Crystal

MIC

Figure—bottom

I/O

Antenna

3.5 Phone

JACK

GSM

Antenna

X377 L3 Service Manual

2.1 Can’t download

It might be the poor soldering of IO Connector, please check the soldering quality of IO Connector first,

and then check the related diagram.

Solution：

1. Use a fresh data cable.

2. Check the I/O connector and its soldering quality, and then check the volume ofJ0802.

3. Re-Solder the IO connector.

4. Re-Solder the 26M crystal (X0601) or change it.

5. Re-Solder the CPU (U0100) or change it.

Figure--BB IC D/L interface

Figure--USB I/O interface

Figure--26M crystal

X377 L3 Service Manual

2.2 Can’t power on

Solution：

1. Check resistor R0999 from net PWRKEY to net PBINT is correct ornot.

2. Power on the handset with DC to verify its current is correct or not, check the diagram of VBAT &VBUS

is shorted or damaged.

3. Re-Solder the 26M crystal (X0601) or change it.

4. Re-Solder the CPU (U0100) or change it.

Figure--Powerkey circuit

X377 L3 Service Manual

2.3 Can’t getting charged

Solution：

1. Use a fresh USB data cable or charger, re-solder the IO connector.

2. Check T0391 is poor soldering, shorted or damaged.

3. Check Mid PIN of battery connector is poor soldering or not ,check the related component is shorted

,broken or not (J0392 might be broken, T0398might be shorted).

4. Re-Solder the CPU (U0100)or change it.

X377 L3 Service Manual

2.4 LCD Display fail

Solution：

1. Re-Solder the LCD or change it.

2. Re-Solder the CPU (U0100)or change

it.

Figure – LCD circuit

X377 L3 Service Manual

2.5 Camera is not working

Solution：

1. Re-Solder the camera or change it.

2. Re-Solder the CPU(U0100)or change it.

Figure – Camera circuit

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