Ericsson SH 888 Trouble-Shooting Instruction
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Ericsson SH 888 Trouble-Shooting Instruction

Standard electrical repairs
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SH888, S868, Standare Electrical Repair
Approved according to 1776-2/FEA 209 544
Trouble-shooting
instruction
SH 888/S 868
Standard electrical repairs
4/00021-2/FEA 209 544/3.D

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  • Page 1 SH888, S868, Standare Electrical Repair Approved according to 1776-2/FEA 209 544 Trouble-shooting instruction SH 888/S 868 Standard electrical repairs 4/00021-2/FEA 209 544/3.D...

  • Page 2: Table Of Contents

    SH888, S868, Standare Electrical Repair Table of contents Conditions ..................3 Component classifications............. 3 Updates.................... 3 Abbreviations.................. 4 No serv or can’t place calls.............. 6 Doesn’t start..................11 Audio....................18 Display ..................... 25 Charging..................28 SIM fault ..................

  • Page 3: Conditions

    SH888, S868, Standare Electrical Repair 1 Conditions 1.1 Component classifications. All the components in the phone are divided into classes and after every component in the troubleshooting guide you have a class written. The classification of the com- ponent depends on how much of the phone’s performance that’s affected when replacing it.

  • Page 4: Abbreviations

    SH888, S868, Standare Electrical Repair 1.3 Abbreviations. Crystal. Capacitor. Digital circuit. Over voltage protection. Buzzer, LED, pads for display. Connector. Coil. Analogue circuit. Resistor. BALUN. A circuit that converts a signal from balanced to unbalanced or the opposite. Transistor or diode. Antenna connection, contact surface at the circuit board.
  • Page 5 SH888, S868, Standare Electrical Repair VBATT: Battery voltage. VDIG: DC voltage for the processor and memory (3.2V). VDSP: DC voltage for the DSP (Digital Signal Processor) (3.2V). VDSPC: DC voltatge for the DSP (Digital Signal Processor) (2.5V). VLCD: DC voltage for the display the controls the contrast (-2.7V). VDLCD: The feed voltage for the display.

  • Page 6: No Serv Or Can't Place Calls

    SH888, S868, Standare Electrical Repair 2 No serv or can’t place calls. Find out if the fault is Rx- (receiver) or Tx- related (transmitter). Connect the phone (with signaling program) to a GSM test instrument and try to get serv at -68.5dBm signal strength. •...
  • Page 7 SH888, S868, Standare Electrical Repair Measure the resistances of C530 - C535 (all six of class A, >200 kohms and in fig. 2.1) Measure the resistances of C850 (>100 kohms, class A, fig. 2.1), C851 (>1 kohms, class A, fig. 2.1), C833 (>1 kohms, class A, fig. 2.1) and C853 (>100 kohms, class A, fig.
  • Page 8 SH888, S868, Standare Electrical Repair Z205 P401 Z204 L223 Z203 Fig. 2.3 2.2 Connect a call. To try GSM900, connect a call at powerlevel 5 and signal strength of -68.5dBm. To try GSM1800, connect a call at powerlevel 0 and signal strength of -68.5dBm. •...
  • Page 9 SH888, S868, Standare Electrical Repair Make sure L403 (class A, fig. 2.2) isn’t burnt. Measure the resistances of C853 (>100 kohms, class A, fig. 2.1), L560 (~0 ohms, class A, fig. 2.2) and L223 (~0 ohms, class A, fig. 2.3). If the fault isn’t repaired, send the phone to the next level.
  • Page 10 SH888, S868, Standare Electrical Repair • If the output power is too low, check the solderings of N560 (GSM1800) and N570 (GSM900, both in fig. 2.2). Also check the solderings at Z205, Z203 (GSM900) and Z204 (GSM1800, all in fig. 2.3). If the fault still remains, send the phone to the next level.

  • Page 11: Doesn't Start

    SH888, S868, Standare Electrical Repair 3 Doesn’t start. Find out if the phone starts when pressing the On/Off key. Insert a fully charged battery into the phone and press the On/Off key. • If the phone doesn’t start, proceed to section 3.2. •...
  • Page 12 SH888, S868, Standare Electrical Repair Also check the manufacturing week of the circuit board. At the boards manufac- tured in 1998 week 20-22, l540 (class A, fig. 3.1) is to be replaced. At the boars manufactured other dates, check the solderings at L540. As soon as the fault is fixed, send the phone through the normal flow.
  • Page 13 SH888, S868, Standare Electrical Repair 3.4 Measuring at a powered circuit board. 3.4.1 Doesn’t start in flash programmer. Open the phone and check for liquid damages. Make sure the system connector pads aren’t damaged or burnt. Measure the resistance of R421 (0.1 ohms, class B, fig. 3.1). •...
  • Page 14 SH888, S868, Standare Electrical Repair Fig. 3.2 Check the amplitude of the 13MHz system clock at B510 pin 1 (~1V t-t, class C, fig. 3.1). Measure it by using an oscilloscope, spectrum analyzer, frequency counter or a diode probe. • If the amplitude is too low, send the phone to the next level. Make sure there aren’t any faulty solderings at D600 or D610 (fig.
  • Page 15 SH888, S868, Standare Electrical Repair Measure the VDIG and VDSP voltages (~3.2V, fig. 3.1). • If any of the voltages are too low, measure the resistance from it to ground (VDIG - >500 ohms, VDSP - >25 kohms). * If the resistance is correct, replace the corresponding regulator (VDIG - N702, VDSP - N701, both of class A, fig.
  • Page 16 SH888, S868, Standare Electrical Repair * If the resistance is correct, replace the corresponding regulator. * If it’s too low, send the phone to the next level. • If any of the voltages are too high, replace the corresponding regulator. Measure the VRAD, VVCO and VRPAD voltages (~3.8V, fig.
  • Page 17 SH888, S868, Standare Electrical Repair 3.4.5 The phone doesn’t consume any current when the On/Off key is pressed. Open the phone and check for liquid damages. Make sure the system connector pads aren’t damaged or burnt and that the keypads aren’t broken or dirty, especially the On/Off key (fig.

  • Page 18: Audio

    SH888, S868, Standare Electrical Repair 4 Audio. 4.1 Type of fault. Connect a call to another phone and check the microphone and the earphone. Connect a handsfree to the phone and check the external microphone and the exter- nal speaker. •...
  • Page 19 SH888, S868, Standare Electrical Repair Check the solderings at N800 pins 24 and 26 (fig. 4.2). • If they’re ok, measure the resistance from the J810 pins to ground (>25 kohms) and from pin to pin (>50 kohms). * If the resistance to ground is too low, replace C840 and C841 (both of them class A, fig.
  • Page 20 SH888, S868, Standare Electrical Repair • If they’re correct, measure the resistances of C850 (>100 kohms), C851 (>1 kohms), C829 (>100 kohms), C830 (>100 kohms), C818 (>100 kohms) and C819 (>100 kohms, all of class A and in fig. 4.2). Measure the resistance of C815 (fig.
  • Page 21 SH888, S868, Standare Electrical Repair R802 C817 C810 C812 R825 D600 R805 C813 R830 C835 R804 R636 R601 R806 Fig. 4.4 4.5 Handsfree microphone fault. Check the contact pads at the system connector for dirt, liquid damages and oxida- tion. Replace the system connector if needed. Open the phone and check for liquid damages, especially around the system connec- tor pads.
  • Page 22 SH888, S868, Standare Electrical Repair If the fault remains, replace D600 (class B, fig. 4.4). If that doesn’t help, send the phone to the next level. 4.7 Microphone and earphone fault. Check the contact pads at the system connector for dirt, liquid damages and oxida- tion.
  • Page 23 SH888, S868, Standare Electrical Repair * If the resistance is too low, replace components in the following order: C903 (fig. 4.6), C904 (fig. 4.6), C905 (fig. 4.6), R727 (fig. 4.1) and D900 (fig. 4.6, all of class A). Check the resistance from VDSPC to ground after every component replaced.
  • Page 24 SH888, S868, Standare Electrical Repair 4.10 Other audio fault. Check the contact pads at the system connector for dirt, liquid damages and oxida- tion. Replace the system connector if needed. Open the phone and check for liquid damages, especially around the system connec- tor pads.

  • Page 25: Display

    SH888, S868, Standare Electrical Repair 5 Display 5.1 Type of fault. Insert a fully charged battery into the phone and start it up using the On/Off-button. • If it doesn’t start, proceed to chapter 3 (“Doesn´t start”-fault). • If the display is missing one or more of the segments, proceed to section 5.2. •...
  • Page 26 SH888, S868, Standare Electrical Repair N702:5 R619 R620 D600 R808 C824 R807 C633 V608 C632 R639 C634 C636 R616 V611 R615 C631 C615 R614 C674 Fig. 5.2 (66) 4/00021-2/FEA 209 544/3.D...
  • Page 27 SH888, S868, Standare Electrical Repair 1. RESETO (3.2V) is incorrect, measure the resistance from the pad to pin 77 of D600 (0 ohms). Also check the soldering at that pin. If the resistance is substan- tially higher there’s a foil damage and the phone should be discarded. If the resistance is correct, replace D600 (class B).

  • Page 28: Charging

    SH888, S868, Standare Electrical Repair 6 Charging. 6.1 Type of charging fault. Make a visual check of the battery screws and the system connector. Replace if needed. Start the phone using the On/Off key with a fully charged battery inserted. •...
  • Page 29 SH888, S868, Standare Electrical Repair Fig. 6.1 Check the VDIG (~3.2V) voltage at the marked side of C600 (fig. 6.2), VRAD (~3.8V) at N450 pin 13 (fig. 6.1) and the resistance of R703 (~0 ohms, class A, fig. 6.2). • If any of the voltages are incorrect, proceed to chapter 3 (“Doesn´t start”-fault). •...
  • Page 30 SH888, S868, Standare Electrical Repair * If they are correct and the resistance from DCIO to VBATT still is too high there’s a foil damage and the phone is to be discarded. Give the board power and start it up by grounding pin 6 of N450 (fig. 6.1). •...

  • Page 31: Sim Fault

    SH888, S868, Standare Electrical Repair 7 SIM fault 7.1 What is “SIM fault”. Insert a working SIM-card and a fully charged battery into the phone and start it up. If the display says: • “Wrong card” or “Insert correct card” the phone is SIM-locked and cannot be repaired at this level •...
  • Page 32 SH888, S868, Standare Electrical Repair D600 R685 V620 C626 R683 C625 C627 C630 C628 R600 C629 R627 R628 Fig. 7.2 Measure the resistances of R600 (~33 ohms), R627 (~0 ohms), R628 (~33 ohms) and R683 (~0 ohms, all of class A, fig. 7.2). If all of the measurements are correct, replace D600 (class B, fig.

  • Page 33: Keyboard

    SH888, S868, Standare Electrical Repair 8 Keyboard. 8.1 Kind of keyboard fault. Insert a SIM card and a fully charged battery into the phone. Start it up by pressing the On/Off key. • If it doesn’t start at all, proceed to chapter 3 (“Doesn´t start”-fault). Press all the keys (including the volume keys) to verify which ones are faulty.
  • Page 34 SH888, S868, Standare Electrical Repair 8.2.1 If the resistance to ground is too low from pad: 1 - replace C659 and C689 (class A, fig. 8.1). 2 - replace C658 and C688 (class A, fig. 8.1). 3 - replace C657 and C687 (class A, fig. 8.1). If the fault remains, replace D600 (class B, fig.
  • Page 35 SH888, S868, Standare Electrical Repair The functional scheme is shown in fig. 8.3 Fig. 8.3 Make sure there’s voltage (3.2V) at the pads of the faulty keys according to fig. 8.4 below. Note that the “No” key has 4.8V. Fig. 8.4 If the voltage is missing at an entire row of keys, measure the voltage at the corre- sponding pin of D600 (see fig.
  • Page 36 SH888, S868, Standare Electrical Repair If an entire column is non-functional, measure the resistance from the pad to the corresponding pin of D600 (see fig. 8.3, measure from the side of the pad that’s “C” shaped). If there’s a foil damage the phone is to be discarded. If only part of a col- umn is non-functional, measure the resistance from a functional keypad in that col- umn to a non-functional to verify a foil damage.

  • Page 37: Illumination And Buzzer

    SH888, S868, Standare Electrical Repair 9 Illumination and buzzer. 9.1 Type of fault. Insert a dummy battery and a SIM card into the phone, start it up and wait for the phone to get serv (with the GSM test instrument or the GSM net). If the phone doesn’t make a beep when started, go to “menu/Ring Vol”...
  • Page 38 SH888, S868, Standare Electrical Repair * If it’s ok, measure the resistance from it to V606 pin 1 (1.0 kohms, fig. 9.1). * If the resistance is incorrect, replace R651 (class A, fig. 9.2). If that doesn’t help there’s a foil damage and the phone is to be discarded. Measure the resistance from V606 pin 1 to ground (>=2 Mohms).
  • Page 39 SH888, S868, Standare Electrical Repair 9.3 Background illumination fault Open the phone and check for liquid damages. Make sure all the LEDs, H651-H660 (class A, fig. 9.3), are mounted and properly soldered. Fig. 9.3 Give the board power and start it up. If only a few of a group, H651-H654 (display illumination) or H655-H660 (keyboard illumination), aren’t lit, replace them.
  • Page 40 SH888, S868, Standare Electrical Repair • If there is VBATT voltage at the LEDs, measure the voltage at V613 pin 1 (fig 9.1, ~1.7V while LEDs are supposed to be lit). * If the voltage is missing, check the soldering at D600 pin 92 (fig. 9.2). * If it’s correct, measure the resistance from D600 pin 92 to V613 pin 1 (1 kohms).
  • Page 41 SH888, S868, Standare Electrical Repair • If the voltage and the resistance of R646 are correct but the voltage at H650 is still incorrect, then there’s a foil damage and the phone is to be discarded. Fig. 9.5 Measure the resistance of C654 (>1 Mohms, class A, fig. 9.4). •...
  • Page 42 SH888, S868, Standare Electrical Repair * If it’s correct, measure the voltage at N411 pin 5 (~3.8V, fig. 9.5). * If the voltage is missing, replace N411 (class A). • If the voltage and the resistance of R646 are correct but the voltage at H650 is still incorrect, then there’s a foil damage and the phone is to be discarded.

  • Page 43: Rtc

    SH888, S868, Standare Electrical Repair 10 RTC 10.1 Finding the fault. Start the phone with a SIM-card and a fully charged battery inserted. Set the correct time. Remove the battery and reinsert it after a minute. • If the time says 00:00, proceed to section 10.2. Compare to the correct time.
  • Page 44 SH888, S868, Standare Electrical Repair Fig. 10.2 (66) 4/00021-2/FEA 209 544/3.D...

  • Page 45: Irda

    SH888, S868, Standare Electrical Repair 11 IRDA. 11.1 Type of fault. • If the range of the IRDA device is too short, proceed to section 11.2. • If the IRDA communication isn’t working, proceed to section 11.3. 11.2 Short range. Open the phone and check for liquid damages.
  • Page 46 SH888, S868, Standare Electrical Repair If that doesn’t help, open the phone and check for liquid damages. Check the solderings at D600 pins 47, 62, 64, 65 and 66 (fig. 11.3). Fig. 11.3 Check the solderings at J604 (class A, fig. 11.3) and make sure the contact pins aren’t damaged.

  • Page 47: Component Lists

    SH888, S868, Standare Electrical Repair 12 Component lists 12.1 Explanation Mounting drawing table The Mounting drawings show the components placements (Pos) at the printed board. The Mounting drawings are not included in this document. Component list • Position: The components position number at the board. •...

  • Page 48: Component List Sh888, S868

    SH888, S868, Standare Electrical Repair 12.3 Component list SH888, S868 ROA 117 3313 SH888, S868 Position Designation Part No. Note B510 QUARTZ CRYS- Not available TAL UNIT B600 QUARTZ CRYS- RTM 501 677/01 Verify Real Time Clock function TAL UNIT C102 Not mounted Not mounted...
  • Page 49 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note C229 CAPACITOR RJC 464 3025/1 C230 CAPACITOR RJC 464 3025/1 C231 Not mounted Not mounted C232 CAPACITOR RJC 464 3024/1 C233 CAPACITOR RJC 464 3024/1 C234 CAPACITOR RJC 463 3022/1 C235-C237 CAPACITOR RJC 464 3024/1 C238...
  • Page 50 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note C321 CAPACITOR RJC 463 3022/33 C350 CAPACITOR RJC 463 3021/22 C351 CAPACITOR RJC 463 3021/56 C352 CAPACITOR RJC 463 3022/33 C360 CAPACITOR RJC 463 3023/12 C401 CAPACITOR RJC 463 3022/47 C402 CAPACITOR RJC 496 2047/1...
  • Page 51 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note C441 CAPACITOR RJC 463 3022/1 C442 CAPACITOR RJC 464 3024/22 C443 CAPACITOR RJC 464 3024/22 C445 CAPACITOR RJC 463 3022/22 C446-C449 CAPACITOR Advanced C451 CAPACITOR Advanced C452 CAPACITOR See Revision Change table C453 CAPACITOR...
  • Page 52 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note C582 CAPACITOR RJC 464 3036/1 C583-C587 CAPACITOR RJC 464 3025/1 C588 CAPACITOR Not available C590 Not mounted Not mounted C600 CAPACITOR RJE 316 1061/68 C602-C606 CAPACITOR RJC 464 3035/68 C608-C610 CAPACITOR RJC 464 3035/68 C611-C613 Not mounted...
  • Page 53 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note C686 CAPACITOR RJC 464 3035/68 Verify IRDA function C687-C689 CAPACITOR RJC 463 3022/22 C690 CAPACITOR RJC 463 3022/15 Verify Real Time Clock function C691 CAPACITOR RJC 463 3022/15 Verify Real Time Clock function C692 CAPACITOR...
  • Page 54 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note C816 CAPACITOR RJC 463 3022/22 Verify mic function C817 CAPACITOR RJC 463 3022/22 Verify handsfree mic function C818 CAPACITOR RJC 464 3035/68 Verify mic function C819 CAPACITOR RJC 464 3035/68 Verify mic function C820 CAPACITOR...
  • Page 55 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note F602 VARISTOR REY 203 08/1 Verify portable handsfree func- tion F604 VARISTOR REY 203 08/1 Verify flash function F605 VARISTOR REY 203 08/1 Verify vehicle handsfree function F606 VARISTOR REY 203 08/1 Verify flash function...
  • Page 56 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note L403 TRANSFORMER Advanced L404 TRANSFORMER REG 704 1122/18 L407 TRANSFORMER Advanced L408 INDUCTOR Advanced L500 TRANSFORMER REG 706 18/1 L505 INDUCTOR REG 704 494/1 L540 INDUCTOR REG 704 494/27 L560 TRANSFORMER REG 706 18/1...
  • Page 57 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note R211 RESISTOR REP 622 453/27 R212 RESISTOR REP 622 453/27 R213 RESISTOR REP 622 452/47 R216 RESISTOR REP 622 452/47 R224 RESISTOR REP 622 452/47 R229 RESISTOR REP 622 452/33 R231 RESISTOR REP 622 453/33...
  • Page 58 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note R415 RESISTOR REP 622 656/1 R416 RESISTOR REP 622 451/22 R418 RESISTOR REP 622 452/39 R419 RESISTOR REP 622 655/1 R420 RESISTOR REP 622 455/22 R421 RESISTOR REP 645 620/1 Verify charging function R422 RESISTOR...
  • Page 59 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note R601 RESISTOR REP 622 654/1 Verify portable handsfree func- tion R602 RESISTOR REP 622 453/47 Verify vehicle handsfree function R604 RESISTOR REP 622 455/22 Verify flash function R605 RESISTOR REP 622 654/1 Verify vehicle handsfree function...
  • Page 60 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note R660 RESISTOR REP 622 001/0 Verify Illumination function R670 RESISTOR REP 622 656/1 Verify IRDA function R680-R681 Not mounted Not mounted R683 RESISTOR REP 622 001/0 Verify SIM function R684 Not mounted Not mounted...
  • Page 61 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note R812 RESISTOR REP 622 654/15 Verify mic function R814 RESISTOR REP 622 453/47 Verify mic function R815 RESISTOR REP 622 656/1 R818 RESISTOR REP 622 455/27 Verify mic function R820 RESISTOR REP 622 654/15...
  • Page 62 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note V403 TRANSISTOR RYN 121 6069/1 V405 TRANSISTOR RYN 120 625/1 V406 REGULATOR RKZ 223 01/4 DIODE V407 TRANSISTOR RYN 121 692/1 V408 DIODE RKZ 323 14/1 V409 TRANSISTOR RYN 121 6069/1 V411 DIODE...
  • Page 63 SH888, S868, Standare Electrical Repair SH888, S868 Position Designation Part No. Note X101 CONTACT HOUS- SXA 120 981/2 Z201 SAW-FILTER RTN 201 782/01 Z202 FILTER RTN 202 793/02 Z203 FILTER RTN 202 799/01 Z204 FILTER RTN 202 789/01 Z205 FILTER RTN 202 843/01 Z250 FILTER...

  • Page 64: Revision Change Table For Roa 117 3313

    SH888, S868, Standare Electrical Repair 12.4 Revision change table for ROA 117 3313 ROA 117 3313 Revisions Part number C104 Up to R1C Not mounted C104 R1D and higher RJC 463 3022/33 C280 RJC 463 3021/33 C280 R1B and higher Not mounted C411 Up to R1B...
  • Page 65 SH888, S868, Standare Electrical Repair ROA 117 3313 Revisions Part number R701 Up to R1B REG 724 9342/33 R701 R1C and higher Not mounted R802 Up to R1A REP 622 655/1 R802 R1B and higher REP 622 654/39 R805 Up to R1A REP 622 654/56 R805 R1B and higher...
  • Page 66 SH888, S868, Standare Electrical Repair (66) 4/00021-2/FEA 209 544/3.D...

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