Ericsson A1018s Trouble-Shooting Instruction
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Ericsson A1018s Trouble-Shooting Instruction

Standard electrical repairs
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Trouble-shooting
instruction
A1018s/A1018sc
Standard electrical repairs
4/00021-2/FEA 209 544/16.B
A1018s/A1018sc Standard Electrical Repair
Approved according to 1776-2/FEA 209 544

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Summary of Contents for Ericsson A1018s

  • Page 1 A1018s/A1018sc Standard Electrical Repair Approved according to 1776-2/FEA 209 544 Trouble-shooting instruction A1018s/A1018sc Standard electrical repairs 4/00021-2/FEA 209 544/16.B...

  • Page 2: Table Of Contents

    A1018s/A1018sc Standard Electrical Repair Table of contents Conditions ..................3 Component classes................3 Abbreviations .................. 4 No serv / not able to connect calls............ 5 Doesn´t start..................8 Audiofel .................... 13 Display ..................... 21 Charging ..................24 SIM fault ..................

  • Page 3: Conditions

    A1018s/A1018sc Standard Electrical Repair 1 Conditions 1.1 Component classes. All the components of the board are divided into four classes: A, B, C and D. The class of the component depends on how much of the performance of the phone is affected when replacing it.

  • Page 4: Abbreviations

    A1018s/A1018sc Standard Electrical Repair 1.2 Abbreviations Crystal. Capacitor. Digital circuit. Over voltage protection. Buzzer, LED, pads for display. Connector. Coil. Analogue circuit. Test point. Resistor. Transistor or diode. Antenna connection. Contact surface at the circuit board. Filter AGND: Ground for analogue signal.

  • Page 5: No Serv / Not Able To Connect Calls

    A1018s/A1018sc Standard Electrical Repair 2 No serv / not able to connect calls. 2.1 Type of fault. Connect the phone to a GSM test instrument and try to get serv at –68.5 dBm input signal, check both bands (GSM 900 & 1800).
  • Page 6 A1018s/A1018sc Standard Electrical Repair Fig. 2.1 2.3 The phone only gets serv at GSM 900. Open the phone and check for liquid damages. Check the soldering at N330 (class B), N332 (class B) and N202:40,41 (class C)(all in fig.2.1). Replace N330.
  • Page 7 A1018s/A1018sc Standard Electrical Repair The phone gets serv, but can´t connect a call. Open the phone and check for liquid damages. Check the soldering at the components around N202 (class C) and N550 (class C)(both at fig. 2.1). If the fault remains, send the phone to the next repair level.

  • Page 8: Doesn´t Start

    A1018s/A1018sc Standard Electrical Repair 3 Doesn´t start. 3.1 Type of fault. Attach a dummy battery. • If the phone starts automatically, proceed to section 3.2. Press the On/Off button. • The phone starts (lights up the illumination, asks for SIM or PIN or searching for a network), check the charging function by connecting a charger to the system connector.
  • Page 9 A1018s/A1018sc Standard Electrical Repair Start immediately when the battery is attached. Open the phone and check for liquid damages. Make sure there is no dirt making a short circuit at the On/Off pads (”No” key, fig 3.2). Clean if necessary, use alcohol and a brush.
  • Page 10 A1018s/A1018sc Standard Electrical Repair Fig. 3.3 3.4 The fault is intermittent. Make an outer visual check and make sure the battery screws (fig 3.1) are okay and properly mounted. Open the phone and check for liquid damages, also make sure the connection pads for the battery screws are clean.
  • Page 11 A1018s/A1018sc Standard Electrical Repair Give the board power and make sure VBATT exists at the marked side of the On/Off button (fig. 3.5). If VBATT doesn´t exist, is there a foil damage and the board has to be discarded. Fig. 3.5 Make sure R703 (4.7 kOhm) and R704 (0 Ohm, both fig.
  • Page 12 A1018s/A1018sc Standard Electrical Repair Measure the voltage at the marked side of C710 (~3.1 V). • Incorrect: Replace C710 • Correct: Replace D610. Try to program the phone again Replace D600 If the fault still remains, send the phone to the next repair level.

  • Page 13: Audiofel

    A1018s/A1018sc Standard Electrical Repair 4 Audiofel 4.1 Type of fault. Make a call from the phone that is to be tested (later called the phone) to a phone that is working correctly (later called the reference phone). Check the function of the microphone and the earphone.
  • Page 14 A1018s/A1018sc Standard Electrical Repair Measure the resistance of C840 or C841 (>1 MOhm, class A, fig. 4.1) to check if there is a short circuit in any of them. If the fault remains, send the phone to the next repair level.
  • Page 15 A1018s/A1018sc Standard Electrical Repair Fig. 4.2 4.3 The microphone is out of order. Open the phone and check for liquid damages. Clean the pads to the microphone if necessary. Replace the microphone with one you know is working. Assemble the phone and try again.
  • Page 16 A1018s/A1018sc Standard Electrical Repair If both resistances are correct, measure the resistance between P800 (fig. 4.1) and N800:14 (fig. 4.2) (~2 kOhm). • If it is too large, is there a foil damage and the board has to be discarded.
  • Page 17 A1018s/A1018sc Standard Electrical Repair 4.5 The handsfree microphone is out of order. Open the phone and check for liquid damages, especially around the pads of the system connector, J602:1,2,4 (fig. 4.3). Fig. 4.3 Measure the resistance between J602:2 and ground, it should be larger then 30 kOhm.
  • Page 18 A1018s/A1018sc Standard Electrical Repair Fig. 4.4 If the fault still remains, send the phone to the next repair level. 4.6 The handsfree speaker is out of order. Open the phone and check for liquid damages, especially around the pads of the system connector, J602:1,2,4 (fig.
  • Page 19 A1018s/A1018sc Standard Electrical Repair Both the handsfree microphone and the handsfree speaker is out of order. Make sure the system connector is okay and not dirty. Open the phone and check for liquid damages, especially around the pads of the system connector.
  • Page 20 A1018s/A1018sc Standard Electrical Repair Fig. 4.5 Measure the resistance between J602:6 (fig. 4.5) and ground, it should be >1 Mohm. • If it is incorrect, replace C665 (class A, fig. 4.1). * If the resistance still is incorrect, replace D600 (class B, fig. 4.2).

  • Page 21: Display

    A1018s/A1018sc Standard Electrical Repair 5 Display 5.1 Type of fault. Start the phone, with a fully charged battery attached, using the On/Off button. • The phone doesn´t start, proceed to chapter 3 (“Doesn´t start”-fault). • The display misses one or more segments, proceed to section 5.2.
  • Page 22 A1018s/A1018sc Standard Electrical Repair Fig. 5.1 1 - VLCD (~ 6.2 V) is incorrect, diode measure V608:1-3, V611:1-3 and V611:2-3 (fig. 5.2). Replace if faulty. Measure the voltage at V611:1 (~3.8 V). • If the voltage is missing, make sure N580 (fig. 5.2) is correctly soldered, if it is replace N580.
  • Page 23 A1018s/A1018sc Standard Electrical Repair 3 - I2CDAT (~ 3.2V) is incorrect, measure the resistance of R619 (6.8 kOhm, fig. 5.2). Check the soldering at D600:3. If all is correct, replace D600. 5 - I2CCLK (~3.2 V) is incorrect, measure the resistance of R620 (6.8 kOhm, fig.

  • Page 24: Charging

    A1018s/A1018sc Standard Electrical Repair 6 Charging 6.1 Type of fault. To verify that it is the phone that is faulty, use a charger and a battery you know is working and try to charge the battery. Note! The phone doesn´t begin to charge if the charger is connected to a phone without a SIM card inserted (the display shows ”Insert Card”).
  • Page 25 A1018s/A1018sc Standard Electrical Repair 6.2 Doesn´t show charging in the display. Open the phone and check for liquid damages. Make sure the pads of the system connector are not burned or have oxide or dirt on them. Clean them with isopropyl alcohol if necessary.

  • Page 26: Sim Fault

    A1018s/A1018sc Standard Electrical Repair 7 SIM fault 7.1 What is SIM fault? Insert a working SIM card and attach a fully charged battery to the phone. If the display shows: • ”Wrong card” or ”Insert correct card”, the phone is SIM locked and can´t be repaired at this level.
  • Page 27 A1018s/A1018sc Standard Electrical Repair Give the board power and start it. Measure VVIC at D901:1 (3.2 V, Fig. 7.1). • If the voltage is missing: * Replace C910 and R920 (class A). • If the voltage exists: * Measure the voltage at D901:2 (3.2 V).

  • Page 28: Keyboard

    A1018s/A1018sc Standard Electrical Repair 8 Keyboard 8.1 Type of keyboard fault. Insert a SIM card and attach a fully charged battery. Start the phone using the On/ Off-button. If the phone doesn´t start at all, proceed to chapter 3 (“Doesn´t start”- fault).
  • Page 29 A1018s/A1018sc Standard Electrical Repair Fig. 8.1 8.2 A complete row or column is faulty. Check the corresponding soldering at D600 (Fig. 8.1 and 8.2) for the faulty row/col- umn. (42) 4/00021-2/FEA 209 544/16.B...
  • Page 30 A1018s/A1018sc Standard Electrical Repair Fig. 8.2 If the soldering is correct, measure the resistance from one of the faulty pads (row/ column see Fig. 8.3) to the corresponding pin of D600 (Fig. 8.2). Should be ~0 Ohm, otherwise is there a foil damage.
  • Page 31 A1018s/A1018sc Standard Electrical Repair If the resistance is correct, replace D600 Some keys (not a complete row/column) are faulty. Make sure the soldering at D600:1,120-128 are correct. If the soldering is correct there is a foil damage and the board has to be discarded.

  • Page 32: Illumination And Buzzer

    A1018s/A1018sc Standard Electrical Repair 9 Illumination and buzzer 9.1 Type of fault. Insert a SIM card and attach a dummy battery to the phone. Start the phone by pressing the On/Off -button and wait for the phone to get serv (against an instrument or a “real”...
  • Page 33 A1018s/A1018sc Standard Electrical Repair • If all soldering is correct, replace the buzzer (H600). Try the buzzer again by starting the board in the fixture, the buzzer should sound because there is no SIM card inserted. • If the fault remains, make sure R606 is ok by measure the voltage at both sides of it (VBATT).
  • Page 34 A1018s/A1018sc Standard Electrical Repair * If the resistance of the LEDs are too high, make sure VBATT exist on the them. If VBATT is missing, the phone is probably liquid damaged. If VBATT is correct, make sure R607 (~1.0 Kohm, class A) and R609 (~2.7 Ohm, class A) are mounted and correctly soldered.
  • Page 35 A1018s/A1018sc Standard Electrical Repair Fig. 9.4 * If the soldering is correct, replace D600 (class B). If the fault still remains, send the phone to the next repair level. The keyboard illumination is missing or faintly glowing. Open the phone and check for liquid damages.
  • Page 36 A1018s/A1018sc Standard Electrical Repair Fig. 9.5 Give the board power and start the board. • If only a couple of the LEDs are faulty, replace them. • If none of the LEDs are lit, make sure VBATT exists at them. If VBATT is miss- ing, the phone probably is liquid damaged.
  • Page 37 A1018s/A1018sc Standard Electrical Repair If the fault still remains, send the phone to the next repair level. 9.5 Green top indicator doesn´t work. Open the phone and check for liquid damages. If the red top indicator doesn´t work either (to check it see section 1), measure the resistance of R646 (~470 Ohm) and check the soldering of it (R646).
  • Page 38 A1018s/A1018sc Standard Electrical Repair • If the soldering is correct, replace H650. * If that doesn´t fix it, measure the resistance between H650:3 (fig. 9.7) and D600:94 (fig 9.8) (~0 Ohm) * If the resistance is ~0 Ohm, replace D600 * If the resistance is larger, is there a foil damage.
  • Page 39 A1018s/A1018sc Standard Electrical Repair * If that doesn´t fix it, measure the resistance between H650:1 and D600:93 (~0 Ohm). * If the resistance is ~0 Ohm, replace D600. * If the resistance is larger, is there a foil damage. If the fault still remains, send the phone to the next repair level.

  • Page 40: Rtc

    A1018s/A1018sc Standard Electrical Repair 10 RTC 10.1 Find the fault. Start the phone with a SIM card inserted and a fully battery attached. Set the clock at the right time. Remove the battery and reattach it after one minute. • If the clock in the phone shows 00:00, proceed to section 10.2.
  • Page 41 A1018s/A1018sc Standard Electrical Repair If it is, replace it. Assemble the phone, start it and set the correct time again. Wait a few minutes to allow the backup capacitor to begin charging. Remove the battery and reattach it after one minute. Make sure the fault is fixed. (The backup capacitor needs to be charged for a few hours before it is fully charged.) Compare to a clock...

  • Page 42: Component Lists

    A1018s/A1018sc Standard Electrical Repair 11 Component lists Component lists in document 131 22-2/FEA 209 544/16 (42) 4/00021-2/FEA 209 544/16.B...

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A1018sc

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