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Ericsson A1018S, Trouble-Shooting Instruction, Page: 28 / 42

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Ericsson A1018S Trouble-Shooting Instruction Download Page 28

A1018s/A1018sc Standard Electrical Repair

4/00021-2/FEA 209 544/16.B

28

(42)

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).

Press all keys and verify which one that doesn´t start.

The easiest way to do the verification is as follow:

•

Go to Menu/Settings/Key sound and choose “Click”.

•

Press the keys "1", "2", "3"... ..."*"," 0" ," #". You should hear a click sound and
see the responding figure in the display when pressing each key. Then press
"Yes", "No", "Clr", "<" and" >". When pressing "Yes" the phone tries to connect
a call, press "No" and the phone should stop connecting a call. Press "<" or " >"
and you scroll the menus and "Clr" clears the display from the figures that came
up.

Open the phone and check for liquid damages, especially around the faulty keys.

Clean the keyboard pads thoroughly and assemble the phone with a new keyboard.
Check if the keys are working according to the test above.

•

If a complete row or a complete column (according to fig. 8.1) is faulty, proceed
to section 8.2.

•

If only some keys are faulty, proceed to section 8.3.

Summary of Contents for A1018S

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

Page 2: ...2 42 Table of contents 1 Conditions 3 1 1 Component classes 3 1 2 Abbreviations 4 2 No serv not able to connect calls 5 3 Doesn t start 8 4 Audiofel 13 5 Display 21 6 Charging 24 7 SIM fault 26 8 Keyb...

Page 3: ...all towards the real network not only towards a GSM test instrument and run it through the normal tests is enough to verify the functionality since the performance of the phone is only slightly affect...

Page 4: ...e at the circuit board Z Filter AGND Ground for analogue signal AFMS Audio From Mobile Station ATMS Audio To Mobile Station DCIO DC voltage used for charging the battery through the system connector G...

Page 5: ...n 2 4 Gets serv but can t connect a call at any of the bands proceed to section 2 5 If the phone can connect a call against the GSM instrument but not at the real net work make sure the phone isn t lo...

Page 6: ...fault remains send the phone to the next repair level 2 4 The phone only gets serv at GSM 1800 Open the phone and check for liquid damages Measure the resistance of N203 5 class B fig 2 1 to ground Th...

Page 7: ...544 16 B 7 42 2 5 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 I...

Page 8: ...charging works the phone probably is okay the fault can be due to problem with the battery The phone only works as long as the On Off button is being pressed proceed to section 3 3 The phone doesn t s...

Page 9: ...rush Fig 3 2 If the fault still remains send the phone to the next repair level 3 3 The phone works as long as the On Off but ton is being pressed Open the phone and check for liquid damages Check the...

Page 10: ...e the connection pads for the battery screws are clean Check the soldering at D600 and D610 fig 3 3 If the soldering is correct and the fault remains send the phone to the next repair level 3 5 The ph...

Page 11: ...e volt age at V702 3 3 5 V when VBATT 5 0 V Incorrect Replace V702 Correct Replace V703 and V704 Note The components V703 V704 R703 and R704 are only mounted at the board version 3920 2 If the fault s...

Page 12: ...Replace D610 Try to program the phone again Replace D600 If the fault still remains send the phone to the next repair level 3 7 The current consumption is 200 mA Open the phone and check for liquid da...

Page 13: ...sfree don t work send the phone to the next level If both the microphone and the earphone don t work proceed to section 4 4 If the microphone the earphone and the handsfree don t work send the phone t...

Page 14: ...rical Repair 4 00021 2 FEA 209 544 16 B 14 42 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 t...

Page 15: ...re the resistance of R817 R819 both 1 kOhm class A and R818 22 kOhm class A all fig 4 2 Check the soldering at N800 14 15 16 class C fig 4 2 If the fault remains replace C818 and C819 class A fig 4 2...

Page 16: ...oldering at N800 Note Class C and D600 fig 4 2 Give the board power and start it using the On Off button Measure the voltage VDIG at N701 5 3 2 V fig 4 2 Incorrect Proceed to chapter 3 Doesn t start f...

Page 17: ...4 fig 4 3 Fig 4 3 Measure the resistance between J602 2 and ground it should be larger then 30 kOhm If the resistance is too low ATMS has a short circuit try to replace C651 class A fig 4 1 Check the...

Page 18: ...ly around the pads of the system connector J602 1 2 4 fig 4 3 Measure the resistance between the system connector J602 1 and ground 100 kohm if it is too low replace F601 fig 4 1 C650 and C668 fig 4 2...

Page 19: ...ance of the resistor is 22 kOhm fig 4 1 If any of R635 or R636 is incorrect replace them If the resistance is too high is there a foil damage and the board has to be dis carded Measure the resistance...

Page 20: ...stance still is incorrect replace D600 class B fig 4 2 Measure the resistance between J602 6 and D600 92 fig 4 2 it should be 470 ohm If it is larger replace R602 class A fig 4 1 and measure again If...

Page 21: ...ceed to section 5 3 The display is black proceed to section 5 4 5 2 Segments are missing Open the phone and check for liquid damages Replace the display 5 3 The display shows nothing at all Open the p...

Page 22: ...the phone to the next repair level Measure the resistance between VLCD and ground If it is 100 kOhm replace C633 fig 5 2 and C673 fig 5 1 Measure the voltage at D600 95 3 0 V and D600 96 0 2 V If any...

Page 23: ...esistance of R620 6 8 kOhm fig 5 2 Check the soldering at D600 4 If all is correct replace D600 Fig 5 2 5 4 The display is black Open the phone and check for liquid damages Try again using a display y...

Page 24: ...oceed to section 6 3 If the phone shows charging but the red top indicator isn t lit proceed to chapter 9 Illumination and buzzer fault 6 1 1 Verification of the charging function Attach a normal batt...

Page 25: ...alcohol if necessary If the gold plating is damaged the board has to be discarded Replace V450 class A Fig 6 1 Fig 6 1 If the fault still remains send the phone to the next repair level 6 3 Starts and...

Page 26: ...lock the phone is locked by the customer with a personal code It will be unlocked in the reset program in the normal repair flow PIN or Enter PIN the SIM card is locked with a personal code Insert ca...

Page 27: ...hm Incorrect 1 Replace R627 class A 2 Foil damage the board has to be discarded 4 Measure the resistance between D901 11 and D901 14 15 kOhm Incorrect 1 Replace R626 class A 2 Foil damage the board ha...

Page 28: ...hear a click sound and see the responding figure in the display when pressing each key Then press Yes No Clr and When pressing Yes the phone tries to connect a call press No and the phone should stop...

Page 29: ...18s A1018sc Standard Electrical Repair 4 00021 2 FEA 209 544 16 B 29 42 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...

Page 30: ...4 00021 2 FEA 209 544 16 B 30 42 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...

Page 31: ...e soldering is correct there is a foil damage and the board has to be discarded To verify it measure the resistance between the faulty pad and a working pad in the same row column should be 0 Ohm The...

Page 32: ...keyboard illumination doesn t light up at start proceed to section 9 4 If the top indicator doesn t flash green when the phone has got serv proceed to section 9 5 When the phone has got serv and flas...

Page 33: ...e a foil damage and the board has to be discarded Replace D600 If the fault still remains send the board to the next repair level 9 3 The background illumination to the display is missing or faintly g...

Page 34: ...maged If VBATT is correct make sure R607 1 0 Kohm class A and R609 2 7 Ohm class A are mounted and correctly soldered Fig 9 3 If none of the LEDs H651 H660 are lit measure the voltage at marked side o...

Page 35: ...dering is correct replace D600 class B If the fault still remains send the phone to the next repair level 9 4 The keyboard illumination is missing or faintly glowing Open the phone and check for liqui...

Page 36: ...uid damaged If VBATT is correct make sure R607 1 0 kOhm class A and R610 4 7 Ohm class A both Fig 9 6 is mounted and has got correct resistance Fig 9 6 If none of the LEDs H651 H660 are lit measure th...

Page 37: ...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...

Page 38: ...here a foil damage If the fault still remains send the phone to the next repair level 9 6 Red top indicator doesn t work Open the phone and check for liquid damages If the green top indicator should f...

Page 39: ...209 544 16 B 39 42 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 faul...

Page 40: ...h it after one minute If the clock in the phone shows 00 00 proceed to section 10 2 Compare to a clock with the correct time If the clock in the phone is speeding or halted proceed to section 10 3 The...

Page 41: ...p capacitor needs to be charged for a few hours before it is fully charged Compare to a clock with a correct time If the clock still is speeding or halted proceed to section 10 3 10 3 The clock is spe...

Page 42: ...A1018s A1018sc Standard Electrical Repair 4 00021 2 FEA 209 544 16 B 42 42 11 Component lists Component lists in document 131 22 2 FEA 209 544 16...

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