Micromax X556 Bedienungsanleitung

S120 L2 Service Manual

Please paste Handset Picture here

S120 L2 Service Manual

1. Technical Specifications :

Please fill below information in Remarks, Below given remarks are for reference only

Particular Remarks

Key Matrix For Flashing SPRD Flashing tool

Chipset SC6531DA

Android Version NA

Processor Frequency 900/1800MHz

Network Mode GSM

ROM 32Mb

RAM 32Mb

Internal memory 4MB

Expandable Memory 8GB

Factory mode code #*868*#

Good Earpiece value in ohms 32 Ohm

Good Loudspeaker value in ohms 8 Ohm

Good Mic value in ohms 330 Ohm

Good Vibrator value in ohms NA

2. CAUTIONS

I. Flashing & Servicing must be undertaken by qualified personnel only.

II. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.

III. Use only approved Tools & components as specified in the parts list.

IV. Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and

alignment

V. Ensure all cables and wires are repositioned correctly if Handset disassembled

VI. Electrostatic discharge can easily damage the sensitive components of electronic products. Therefore,

Service Centre must adhere the precautions which mentioned above.

S120 L2 Service Manual

3. L2 Level trouble shooting

Please add trouble shooting/ Repairing steps against below given symptoms

Images must paste against every suggested troubleshooting hint

1）Main Components

LED BT

SPK

MIC

Motor

S120 L2 Service Manual

2）Display issue

Description Reason Solution

SW FLASH THE SW

Soldering issue Re-soldering the LCD

LCD issue Change the LCD

Segments missing, Fading,

Contrast issue, Black lines, Color

issue, Backlight issue, Blank

display, Bad pixel, Flickering

CPU Refer to the service guide L3

2 Mechanically broken LCD issue Change the LCD

Back Camera

LCD

Receiver

S120 L2 Service Manual

3）Camera

Description Reason Solution

Soldering issue Re-solder it

Camera issue Change it

1 Bad image

CPU Refer to the service guide L3

Soldering issue Re-solder it

Camera issue Change it

2 Camera not ready

CPU Refer to the service guide L3

Soldering issue Soldering issue

Camera issue Change camera

3 DEAD,No functionality

CPU CPU

4 Canot turn to front

camera Camera issue Change front camera

5 Canot turn to back

camera Camera issue Change back camera

LCD TESTING JIG

S120 L2 Service Manual

4）Speaker

Description Reason Solution

The SPK with dust Clean the SPK

SPK foam issue Change it

Spk issue Change it

1 Noise/crack

CPU Refer to the service guide L3

Soldering issue Re-soldering it

SPK issue Change it

2 No volume

CPU Refer to the service guide L3

Soldering issue Re-soldering it

SPK issue Change it

3 Low volume

CPU Refer to the service guide L3

The volume of good SPK is 8Ω +/-0.5

Back camera with

flashlight

S120 L2 Service Manual

5）Microphone

Description Reason Solution

Some dust with MIC Clean the MIC

Assembly issue Assembly it

MIC issue Change it

1 Noise with uplink side

CPUor related component Refer to the service guide L3

Soldering issue Re-solder it

MIC issue Change it

Volume low/no

volume with uplink

side

CPUor related component Refer to the service guide L3

3 TDD noise MIC issue Change it

SPK

S120 L2 Service Manual

1, The volume of good mic K is 2.2kΩ +/-0.5%2，Soldering temperature is 330+/-10℃

6）Receiver

Description Reason Solution

There is dust with receiver Clean the receiver

Receiver issue Change it

1 Noise/crack

CPU Refer to the service guide L3

Connection issue Assembly it again

Receiver issue Change it

2 No voice/ volume low

CPU Refer to the service guide L3

MIC

S120 L2 Service Manual

1. The volume of RECEIVER is 32Ω +/-15% Ohm(at 1KHZ,179mV input)

7）Vibrator

Description Reason Solution

Motor assembly issue Assembly it again

1 Vibrating is not

properly Motor issue Change it

Motor soldering issue Soldering it again

Motor issue Change it

2 No vibrating

CPU Refer to the service guide L3

 The volume of good Vibrator is 30Ω +/-5%

 Soldering temperature is 330+/-10℃

RECEIVER

S120 L2 Service Manual

8）Battery

Description Reason Solution

the voltage of battery is less

than 3.3V

The voltage of battery is more than

1V, and its volume is 150mΩ+/

-10%,

then the battery is good, you can

charge it by DC power (

4V) directly

the voltage of battery is less

than 3.5V

Keep charging it until its voltage to be

3.7V

1 no output

the voltage of battery is 0 Change battery

the voltage of battery is less

than 3.5V

Keep charging it until its voltage to be

3.7V

the voltage of battery is 0 Change battery

2 no charging

CPU or charging IC with issue Refer to the service guide L3

3 Auto charging CPU or charging IC with issue Refer to the service guide L3

Motor

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