Siemens ST55 Bedienerhandbuch

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ST55 Company Confidential

ST55

Level 2.5

Repair Documentation

V 1.0

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ST55 Company Confidential

Table of Content

1Introduction........................................................................................................................3

2Repair Location Code........................................................................................................4

3RTC (RTC Battery) ............................................................................................................5

4LCD Connector (J503).......................................................................................................8

5Camera Connector (J504)...............................................................................................11

6Speaker Spring (JP202) ..................................................................................................14

7SIM Connector (J101)......................................................................................................17

8MIC Connector (JP201)...................................................................................................20

9Battery Connector (JP301)..............................................................................................23

10 IO Connector (JP401)...................................................................................................26

11 Earpiece (JP203)..........................................................................................................29

12 Joystick (SW401)..........................................................................................................32

13 Keypad Connector (JP402)..........................................................................................35

14 FUSE (F401) ................................................................................................................38

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ST55 Company Confidential

1 Introduction

ST55 product family, consists of 1 tripleband (GSM900, GSM1800 and GSM1900) handset

Partnumber on IMEI label:

ST55: S36880-S6850-T100

This manual is intended to help you carry out repairs on level 2.5, meaning limited

component repairs. The documented failure highlights should be repaired in the local

workshops.

All repairs have to be carried out in an environment set up according to the ESD

(Electrostatic Discharge Sensitive Devices) regulations defined in international standards.

If you have any questions regarding the repair procedures or technical questions about the

spare parts do not hesitate to contact our technical support team in Kamp-Lintfort, Germany:

Tel.: +49 2842 95 4666

Fax: +49 2842 95 4302

E-mail: [email protected]

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2 Repair Location Code

The front side of M/B (Connect with keys)

7. JP301

8. JP401 2. J503

4. JP202

3. J504

6. JP201 5. J101 1. RTC

The rear side of M/B

10. SW401

11. JP402

9. JP203

2.1 Code Description

1 RTC RTC 7 JP301 BATT Connector

2 J503 LCD Connector 8 JP401 IO Connector

3 J504 Camera Connector 9 JP203 Receiver

4 JP202 Speaker Spring 10 SW401 Joystick

5 J101 SIM Connector 11 JP402 Keypad Connector

6 JP201 MIC Connector

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3 RTC (RTC Battery)

3.1 Affected Units

Type: ST55

Affected IMEIs / Date Codes: All/All

Affected SW-Versions: All

3.2 Fault Description

Fault Symptoms for customers:

Time/Clock will reset each time power on.

No call records can be saved.

Fault Symptom on GSM-Tester:

None

Component Information

The RTC is a capacitor that supplies the power to the system to make the real time clock go on

counting about 45minutes after the main battery of phone is taken off. Besides, the RTC battery

will always be charged from the PMS when the main battery is inside the phone. See drawing

below.

PMS: Power Management System

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3.3 Repair Document

Description of procedure

Diagnosis

Visual check and measure with a multimeter to detect if the RTC is oxidized or

deformed.

Repair by component change

1. Remove the defected RTC by Hot Air Blower (350°C ~ 400 °C) (350~400 °C).

2. Put on new RTC and add solder at the “+” side first.

3. Then add solder at the “-“ side.

Repair by SW-Booting

Not possible!

Test

Retest handset after repair procedure as described above

List of needed material

Components

ST55 RTC battery

Part Number: L36385-F505-X

Jigs and Tools

Hot Air Blower (350°C ~ 400 °C)

Soldering Iron (350°C ± 20 °C)

Special Tools:

Multimeter

Working materials

Desolder Wick / Braid

Solder

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Drawings

Figure 1.1: ST55 Board RTC Side (Top View)

¨―

Figure 1.2: ST55 Board RTC Placement (RTC) (Top View)

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4 LCD Connector (J503)

4.1 Affected Units

Type: ST55

Affected IMEIs / Date Codes: All/All

Affected SW-Versions: All

4.2 Fault Description

Fault Symptoms for customers:

No screen or wrong display.

Fault Symptom on GSM-Tester:

None

Component Information

The LCD Cable Connector is a 30-pins contact type socket. There are 2 type signals transmitted

through this connector.

1. LCD signal:

A2, D0~D15, WR, REST, VDD 2.8V,VDDL 2.5V are used to transmitted the address signal, data

signal, control signal and power signal of LCD.

2. Backlight LED signal:

There is 11V power supplied to the anode of backlight LED via D303. LCDlight - connects the

cathode of backlight LED and the resister that can limit the current passing through the LED.

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4.3 Repair Document

Description of procedure

Diagnosis

Visual check and measure with a multimeter to detect if pins are cold, insufficient

soldering, oxidized or deformed.

Repair by component change

1.Re-solder this connector if cold or insufficient soldering.

2.Use hot blower to remove defective connector and add solder on pads.

Avoid excessive heat! Watch surrounding component!

3.Heat and put on a new connector to enhance adhesion.

4.Re-solder new connector afterwards.

Repair by SW-Booting

Not possible!

Test

After repair procedure as described above, power on handset and check the display.

List of needed material

Components

ST55 LCD Connector

Part Number: L36334-Z97-C311

Jigs and Tools

Hot Air Blower (350°C ~ 400 °C)

Soldering Iron (350°C ± 20 °C)

Special Tools:

Multimeter

Working materials

Solder; Desolder Wick / Braid

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Drawings

Figure 2.1: ST55 Board LCD Connector Side (Top View)

Figure 2.2: ST55 Board LCD Connector Placement (J503) (Top View)

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ST55 Company Confidential

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