Sony Ericsson K850 Programming manual

K850
1203-2528 rev. 1
Troubleshooting Manual
APPENDIXCOMPONENT OVERVIEW FUNCTIONAL OVERVIEW
ABOUT
ABOUT TROUBLESHOOTING MEASUREMENT POINTS
K850
SEMC Troubleshooting Manual
1(101)

K850
1203-2528 rev. 1
ABOUT
ABOUT
ABOUT
General information
The purpose of this document is to provide enhanced technical information for Sony Ericsson
repair technicians in order to assist during service, repair and troubleshooting operations on Sony
Ericsson mobile phones. It should be used as a complement to other repair instructions and tools
as notified by the local Sony Ericsson representative.
To search for components throughout the entire document use the “search” function in Adobe
Acrobat Reader 7.0 (or later version) and enter the component name or other word. Use zoom to
enlarge.
For easier navigation of the document you can use the bookmarks that appear in the Bookmarks
tab on the left side of the Adobe Acrobat Reader window. Each bookmark jumps to a page in the
document.
Disclaimer
This document is Sony Ericsson confidential and should be treated as confidential in accordance
with the agreement with Sony Ericsson. This document is intended for use by authorized service
technicians only. Sony Ericsson is not to be held responsible for any damages or losses caused
intentionally or unintentionally due to unauthorised use of the information in this document.
Rev. Date Changes / Comments
1 2/14/2008 Initital revision.
Revision History
Contents
ABOUT 2
Contents 2
TROUBLESHOOTING 3
Equipment List 3
On/Off Problems 8
Flash Problems 8
Dead Phone Problems 9
Display Problems 9
Display Illumination Problems 10
Key Problems 10
LED Problems 11
Main Camera Problems 11
VGA Camera Problems 12
Camera Door Problems 12
Vibrator Problems 13
Charging Problems 13
USB/VBUS Charging Problems 14
SIM Problems 14
Memory Stick Problems 15
Audio Internal Problems 15
Audio External Problems 16
FM Radio Problems 16
Bluetooth Problems 17
GSM Network Problems 18
WCDMA Network Problems 18
Xenon Flash Problems 19
System Connector Protection Test 20
Current Comsumption Test 20
Battery & Current Calibration Test 22
Backup Capacitor Test 22
Test Charging 23
ASIC Revision Test 23
Reference Measurement Points 24
TEST POINTS 25
Front Side 25
Back Side 26
SIM & Memory Card Holder 27
Sofia Top Schematic 28
Application & System Performance Top 29
System Top 30
System Control - Clocks & Resets 31
System Memories 32
Power Top 33
Power Regulators & Charging 34
Power Camera 35
Power ASICs 36
Power Memories 37
Connectivity Top 38
Connectivity ADC & I2C 39
Connectivity Cards 40
Connectivity Connectivity 41
Connectivity Keypad 42
Connectivity Camera Door & Flash 43
Access Top 44
Access - GSM & UMTS 45
Access - Bluetooth 46
Imaging Top 47
Imaging Display 48
Imaging Camera 49
Imaging LMU 50
Audio Top 51
Audio Analog 52
Audio Digital 53
FM Radio 54
Test 55
Thor RF Module Top 56
Thor RF Module GSM/EDGE Tx + FEM 57
Thor RF Module GSM/EDGE Rx + Synth 58
COMPONENT OVERVIEW 59
Front Side B - X 59
Back Side C - E 60
Back Side L - Z 61
FUNCTIONAL OVERVIEW 62
Technical Description 62
Block Diagram Access 71
Block Diagram Application 72
Power Distribution & Clocking Concept 73
APPENDIX 74
Replaceable Parts 74
Components B2101 - D2000 75
Components D2010 - D2105 - D2404 76
Components D2420 - D2460 77
Components L2200 - L2401-04 - N1200 78
Components N1210 - N1400 79
Components N2000 - N2201 80
Components N2202 - N2203 81
Components N2205 - N2208 82
Components N2400 - N2402 - N2500 83
Components N2525 - N3100 - N3101 84
Components N4101 - N4200 85
Components S2400 - S2402 - S2403 86
Components V2202 - V2402 - V2405 86
Components V2420-21 - V2425 - V2428 87
Components V2477-78 - V2500 87
Components X1200 - X1201-03 - X2200 88
Components X2409 - X4300 - X2410 89
Components X2511 - X3105 89
Components X4301 90
Camera Module 5 MPixel 90
VGA Camera 90
Xenon Flash Assembly 91
Display 91
Keyboard Schematics 92
Troubleshooting Software Documentation 93
Troubleshooting Fixture Setup Guide 100
SEMC Troubleshooting Manual
2(101)

K850
1203-2528 rev. 1
TROUBLESHOOTING
TROUBLESHOOTING
K850 Equipment List
Note: More additional information about the equipment used for TRS can be found in Repair
Tools Catalogue on CSPN or on the following location: CSPN – Repair Instructions – Electrical –
K850 – Equipment List.
TRS Fixture Kit
Location: CSPN-Repair Instructions-Electrical-K850-Equipment List
Dummy Battery
Location: CSPN-Repair Instructions-Electrical-K850-Equipment List
Part number: 1200-0725
Instruments
Power Supply Channel 1 VBATT
Agilent 6632B or similar
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Instrument Settings:
Voltage: 3.8 Volt
Limiter: 2A
Note: During the calibration the accurate voltage from the VBATT must be within ±0.015 V. If this
is not fulfilled it will result in a faulty calibration. (For more information about recommended power
supply units, see the Repair Tool Catalogue on CSPN under the Mechanical level. The Power
Supply Channel 1 VBATT must allow reverse current.
Note: Maximal cable length between the Power Supply Channel 1 VBATT and the dummy
battery must not exceed 1m. The cable must have a capacity for at least 16A.
Note: It is very important to follow instrument settings instructions when performing the Battery
Calibration Test.
Power Supply Channel 2 DCIO/SEPI
Agilent 6632B or similar
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Instrument Settings:
Voltage: 5.0 Volt
Limiter: 2A
Note: It is very important to follow instrument setting instructions when performing the Current
Calibration Test.
Oscilloscope
Tektronix TDS 2012 or similar
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Digital Multimeter (DMM)
Fluke 83 or similar
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Spectrum Analyzer
HP 8595E or similar
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
RF probe
HP 85024A or similar
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Mobile Phone Tester
Yokogawa VC230 or similar
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
FM Signal Generator
Agilent E4433B or similar
Location: -
RF Connectors
Adaptor 33 N-BNC-50-1
Adaptor to Signal Generator RF Output
Se Picture 1
Location: -
Picture 1
PC Package & PC Software
PC Package (Computer)
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Equipment List SEMC Troubleshooting Manual
3(101)

K850
1203-2528 rev. 1
TROUBLESHOOTING
TROUBLESHOOTING
Urquell Fault Trace SW with project file
Location: CSPN-Repair Instructions-Electrical-Trouble Shooting Application
Project File: K850Project_R1A
Drivers
SEPI BOX Drivers
Location: EMMA III-Drivers-SEPI
SE Communication Interface SEPI BOX
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Part number: LTN 214 1484
Se Picture 2.
Picture 2
Cables
USB Computer Cable
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Se Picture 3.
Picture 3
DSU-60/USB Cable
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Part number: KRY 101 1413
RF Test Cable Flexible
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Part number: RPM 119 885
Se Picture 4.
Picture 4
SEPI Interface Cable –A1
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Part number: KRY 101 1119/1
Se Picture 5.
Picture 5
Power Cable RED to Power Supply Channel 1 VBATT
Maximum Length: 1m
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Power Cable BLACK to Power Supply Channel 1 VBATT
Maximum Length: 1m
Location: CSPN-Repair Instructions-Level: Mechanical-Tool Catalogue
Customized Power Supply Channel 2 DCIO/SEPI Cable
To perform Current Calibration the phone must be supplied directly through the system connector.
Customize the cable according to following instructions:
Equipment List SEMC Troubleshooting Manual
4(101)

K850
1203-2528 rev. 1
TROUBLESHOOTING
TROUBLESHOOTING
STEP 1:
Take the CST-75 battery charger and cut of the charger according to Picture 6.
Picture 6
Note: Cable length must be exact 1.3m.
STEP 2:
Connect the CST-75 charger Red or White wire to the Plus Output and the Black wire to the
Minus (GND) Output at Power Supply Channel 2 DCIO/SEPI according to Picture 7.
Picture 7
STEP 3:
Trim the flex protection material from inside of the charger plug according to Picture 8.
Picture 8
STEP 4:
Connect DCIO and SEPI Interface Cable – A1 cables according to Picture 9.
Picture 9
The setup in Picture 10 is WRONG!
Picture 10
Power Supply Channel 2 DCIO/SEPI Cable Connection Setups
Correct DCIO/SEPI Cable setup when TRS Fixture is used.
Picture 11
Note: Example of DCIO/SEPI and K750 TRS Fixture Setup.
Equipment List SEMC Troubleshooting Manual
5(101)

K850
1203-2528 rev. 1
TROUBLESHOOTING
TROUBLESHOOTING
Correct DCIO/SEPI Cable setup without the TRS Fixture.
Picture 12
Picture 13
Customized FM Radio Cable
STEP 1:
Use Cable according to Picture 14
Picture 14
Product Name: Test lead BNC-4mm 1,5m
Product Description: Test lead with 4 mm lab plugs at one end and a BNC plug at the other.
Manufacturer: PMK Germany
Location: http://www.elfa.se/en/ or other supplier.
Part number: 46-310-40 (Note: This is ELFA part number)
STEP 2:
Cut the Red lab plug according to Picture 15
Picture 15
STEP 3:
Use any Hands free (PHF) Cable and cut according to Picture 16
Picture 16
Note: Minimum Cable length 40 cm.
STEP 4:
Use only wire connected to Pin2 and cut all rest wires according to Picture 17.
Use digital multimeter instrument (DMM) and perform diode measurement to select wire
connected to Pin2 at hands free system connector plug.
Picture 17
Equipment List SEMC Troubleshooting Manual
6(101)

K850
1203-2528 rev. 1
TROUBLESHOOTING
TROUBLESHOOTING
STEP 5:
Connect by soldering cable from Picture 15 and cable from Picture 17 according to Picture 18.
Picture 18
Test Cards
Dummy SIM
Customize SIM Card according to Picture 19.
Picture 19
Local SIM
Any functional Local SIM Card, se Picture 20
Picture 20
Test SIM GSM/UMTS
One Test SIM GSM/UMTS is needed to perform Current Consumption Test, se Picture 21.
Location: To buy a Test SIM GSM/UMTS, please contact your supplier of test equipment.
Picture 21
Sony Memory Stick Micro Card M2
Any functional Memory Stick Micro M2 Card, se Picture 22
Picture 22
Equipment List SEMC Troubleshooting Manual
7(101)

K850
1203-2528 rev. 1
TROUBLESHOOTING On/Off Problems
TROUBLESHOOTING
1. Customize the phone into DPY/Z
2. Startup the phone and wait for
the configuration to take place
(takes less than a minute)
3. Customize with correct CDA
4. Activate the phone
No
No
START
Connect:
Dummy Battery connected
to VBATT
Go to
Dead phone
Problems part 1
Yes
No
No
Connect a chargerNo
Yes
Go to
Key problems
Yes
Go to
Dead Phone
Problems part 1
Yes
Yes
Go to
System Connector
Protection Test.
After this go to
Flash problems
Yes
Yes
NoYes
No
Is the phone
consuming more than
1mA when the phone
is powered off
Is it possible to
power on the phone
Is the
phone consuming
any current when
powering on the
phone
Problem
solved
Is the phones
behavior as normal
Optimized
charging
Flash process
started
Flash
the phone with
ITP software
successful
Problem
solved
Is it possible to power
off the phone
Yes
Go to
Current
Consumption Test
After this go to
Charging Test.
Yes
No
Claim for a
SW Upgrade
Yes
No
No
Go to
Flash problems
No
No
Is the current
consumption between
10mA and 70mA
Press
2 and 5
Connect USB
Run Pre-config 1 and 2
Run DPY/Z
Successful
Flash
CDA Software
Flash
Successful
Flash
the phone with
correct CDA
software
Yes
On/Off problems
START
Step 1:
Perform System
Connector Protection Test.
Step 2:
Phone with Normal SW
Use TRS Fixture
Connect:
Display and Keypad
Connect: VBATT
Try to Flash the phone by
using EMMA III SW
No
SL 5 Replace
Z2450
SL 4 Scrap
The phone
indicate charging
on display
5 Volt DC at
MP 123 (C2414)
Yes
No
Yes
Yes
Max 2 Ohm between
MP 119 (X2400_Pin11)
and MP 117
(Z2450 pin 3)
No
SL 5 Replace
R2484
SL 4 Scrap
Yes
No
Power up the phone
Connect USB Cable
From PC
Go to
USB/VBUS Charging
problems
No
3.3 Volt DC
Pulses at
MP 120 (C2476)
Yes
1.8 Volt DC
Pulses at
MP 125 (C2474)
Disconnect the
phone from
TRS Fixture
Flash process
Start-up
When using
EMMA
No
Yes
Download
ITP SW
By using EMMA
Passed
Yes
SL 5 Replace
D2010
SL 4 Scrap
No
1.8 Volt DC
Pulses at
MP 23 (R2427)
SL 5 Replace
D2000
SL 4 Scrap
No
Replace
D2404
Yes
Max 0.5 Ohm between
MP 119 (X2400_Pin11)
and MP 121
(Z2450 pin 2)
No
Max 2 Ohm between
MP 118 (X2400_Pin10)
and MP 116
(Z2450 pin 4)
Yes
Max 0.5 Ohm
between
MP 118 (X2400_Pin10)
and MP 122
(Z2450 pin 1)
No
Replace
System Connector
X2400
Replace
System Connector
X2400
SL 5 Replace
Z2450
SL 4 Scrap
Yes
No
Replace
D2404
Yes
Problem
solved
Claim
D2404
Yes
SL 5 Replace
D2000
SL 4 Scrap
No
Flash problems
/ Flash Problems SEMC Troubleshooting Manual
8(101)

K850
1203-2528 rev. 1
TROUBLESHOOTING Dead Phone Problems
TROUBLESHOOTING
START
Step 1:
Try to recover the phone
using EMMA III SW
Press key 2 and 5
Connect USB Cable
Run pre-config 1 or 2
Run DPY/Z
Step 2:
Use TRS Fixture
Connect VBATT
NOTE:
Do NOT use
DCIO/SEPI Cable!
S2400
not pressed
Using more than
1 mA
current
Try to trace the
faulty component
with freezing spray
N1002
(inside N1200)
N1200, N1210
getting hot
Replace
N1002, N1200 or
N1210
Yes
SL 5 Remove
N2000
SL 4 Scrap
No
Using more than
1 mA
current
SL 5 Replace
N2000
SL 4 Scrap
No
Try to trace the
faulty component
with freezing spray
Yes
Keep S2400
pressed or
connect
DCIO/SEPI Cable
No
32 kHz
RTCCLK at
MP 6 (B2101 Pin7)
2.2 Volt at
MP 7 (C2218 VDD_LP)
No
Replace
B2101
Yes
32 kHz
RTCCLK at
MP 21 (R2125)
SL 5 Replace
N2000
SL 4 Scrap
No
Yes
No
26 MHz
MCLK at
MP 85 (C2116)
Yes
No
0 Volt
Between Power
Supply GND and
PBA GND
No
SL 5 Replace
R2200
SL 4 Scrap
1.8V DC at
MP 9 (ST2208 VDDE)
2.8V DC at
MP 12 (ST2215
VccA)
Yes
26 MHz
MCLK at
MP 149 (R2100)
SL 5 Replace
N2000
SL 4 Scrap
No
Yes
Replace
N1200
SL 5 Replace
D2000
SL 4 Scrap
No
Yes
Check the following voltages:
2.6V MP 17 (ST2204 AUDIO26)
2.5V MP 11 (ST2203 VANA25)
2.7V MP 14 (ST2212 VBT27)
2.7V MP 34 (ST2213 VDIG)
2.6V MP 36 (ST2214 VBEAR26)
1.8V MP 158 (ST2217 VCORE18)
1.2V MP 56 (ST2206 VCORE12)
Yes
All voltages
Ok
Try to recover
the phone
by downloading
ITP SW
Flash process
successful
Yes
SL 5 Replace
D2010
SL4 Scrap
Yes
Go to
Flash Problems No
AUDIO26
Voltage
Ok
No
V2405, N2400
C2400, C2430,C4213,
C3135,C3136
Short circuit
No
SL 4 Replace
N2400 or V2405
SL 5 Replace
C2400, C2430,
C4213, C3135 or
C3136
Yes
SL 5 Replace
N2000
SL 4 Scrap
VANA25
Voltage
Ok
Yes
Go to
Dead Phone
problems part 2
C2326, C2327,
C2328, C2329, C2330,
C2353, D2000,C2352
Short circuit
YesNo
SL 5 Replace
Faulty Component
SL 4 Scrap
Yes
No
No
Yes
Current
consumption more
than 50mA
SL 5 Replace
N2000
SL 4 Scrap
No
Yes
Dead Phone problems part 1
Dead Phone
problems
Part 2
VBT27
Voltage
Ok
No
SL 4 Replace
N1400
SL 5 Replace
C1409
Yes
SL 5 Replace
N2000
SL 4 Scrap
No
VDIG
Voltage
Ok
Yes
No
SL 4 Replace
D2460, N2525 or
N1400
SL 5 Replace
C2470, D2405, C2402,
C2525, C2524 or C1407
Yes
No
VBEAR26
Voltage
Ok
Yes
No
SL 5 Replace
C3152
SL 4 Scrap
Yes
SL 5 Replace
N2000
SL 4 Scrap
No
VCORE18
Voltage
Ok
Yes
No
Yes
VCORE12
Voltage
Ok
SL 5 Check
C2301 to C2305,
C2307,C2308,C2311,
C2313 to C2319
C2322,C2324,C2325
D2000
SL 5 replace
Faulty component
and L2200
SL 4 Scrap
No
No
Yes
SL 5 Replace
N2000
SL 4 Scrap
SL 5 Replace
Faulty component
SL 4 Scrap
Yes
1.8 Volt DC at
MP 157 (N2202 Pin1)
No
Yes C2243
Short circuit
SL 5 Replace
L2203
SL 4 Scrap
No
SL 5 Replace
C2243 and L2203
SL 4 Scrap
Yes
3.8 Volt DC at
MP 161 (N2202 Pin6)
No
SL 5 Replace
R2207, C2239
and N2202
SL 4 Scrap
No
Replace
N2202
Yes
N1400, C1409
Short circuit
C2470
D2405,C2402
D2460,C2525,C2524,
N2525,C1407,N1400
Short circuit
C3152
Short circuit
D2000,
D2010,V2231,
C2342 to C2351
Short circuit
1.2 Volt DC at
MP 24 (V2207)
No
No
3.8 Volt DC at
MP 57 (L2201)
SL 5 Replace
L2201
SL 4 Scrap
Yes
Replace
L2200
Yes
MP 56 (ST2206)
Short circuit
To PBA GND
Yes
Try to Recover the
Phone by
downloading
ITP SW
Dead Phone problems part 2
SEMC Troubleshooting Manual
9(101)

K850
1203-2528 rev. 1
TROUBLESHOOTING Display Problems
TROUBLESHOOTING
No
Display Backlight
Ok
Replace
X4200
2.6 Volt DC
at
MP 4 (ST4201
VAUDIO26)
Yes
No
Yes
Yes
SL 5 Replace
N2000
SL 4 Scrap
Use Fault Trace SW
MMI
Display pattern
Activate
Tri color pattern
Go to Display
illumination
problems
SL 5 Replace
D2000
SL 4 Scrap
Claim Component
X4200
1.8 Volt DC
at
MP 5 (ST4200
VDDE18)
Display
Ok
No Yes
No
START
Step 1:
Use TRS Fixture and connect the display
and keypad. Connect VBATT.
If the display is working properly at the
TRS Fixture then replace the display
If not then continue with Step 2.
Step 2:
Load ITP SW into the phone
Use TRS Fixture and connect the display
Connect: VBATT and DCIO/SEPI
Continue with the
Display problems TRS guide
Display problems
START
Step 1:
Use TRS Fixture and connect the display
and the keypad. Connect VBATT.
If the display is working properly at the
fixture then replace the display
If not then continue with Step 2.
Step 2:
Load ITP SW into the phone
Use TRS Fixture and connect the display
Connect: VBATT and DCIO/SEPI
Continue with the
Display illumination problems TRS guide
No
Display Backlights
Ok
SL 5 Replace
N2000
SL 4 Scrap
No
3.8 Volt DC at
MP 26 (TP4200)
Use Fault Trace SW
MMI
Misc
Activate
Display Backlight
15V Pk-Pk
Pulses at
MP 26 (TP4200) shortly
after Display Backlights
Is set
Replace
X4200 or Display
Yes
3.8 Volt DC at
MP 51 (V4201
Anode)
No
SL 5 Replace
L4201
SL 4 Scrap
No
Replace
V4201
Yes
Yes
3.8V
Pk-Pk Pulses
at MP 49 (R4215) shortly
after Display Backlights
is set
No
Replace
V4200
Yes
Yes
0 Volt DC
At MP 25 (TP4201)
When Display Backlight
is activated
Yes
SL 5 Replace
V4205 or N2000
SL 4 Scrap
No
1.8 Volt
Pulses at
MP 8 (R2206 OPTO_EN)
shortly after phone
Power On
SL 5 Replace
N2000
SL 4 Scrap
No
3.0 Volt
Pulses at
MP 3 (TP2203 VOPTO30)
shortly after phone
Power On
Yes
Replace
N2201
No
0.8 to 2.5
Volt Pulses at
MP 52 (N4200 Pin6)
shortly after phone
Power On No
Yes
Replace
N4200
Yes
Flash the Phone with
EMMA
SUCR SW
Display illumination problems
/ Display Illumination Problems SEMC Troubleshooting Manual
10 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING Key Problems
TROUBLESHOOTING
Yes
Problem with
Phone On
Perform Diode
Measurement
Connect the
black probe to
MP PBA GND. More than
2.0 Volt DC at
MP 127 (S2400 A)
Press the On/Off
key S2400
Yes
0 Volt DC at
MP 127 (S2400 A)
Replace
S2400
No
SL 5 Replace
N2000
SL 4 Scrap
Yes
Remove
S2400
No
More than
2.0 Volt DC at
MP 127 (S2400 A)
No
Replace
S2400
Yes
Problem with
Phone Off
Replace
V2402
No
Yes
Problem with
Volume Down
key
No
More than
2.0 Volt DC between
MP 134 (S2402 A) and
MP 135 (S2402) C
Yes
Press the
Volume Down key
S2402
Yes
0 Volt DC
between
MP 134 (S2402 A) and
MP 135 (S2402 C)
SL 5 Replace
D2000
SL 4 Scrap
Yes
Replace
S2402
No
Short circuit
between
MP 135 (S2402 C) and
MP PBA GND
No
Remove
S2402
SL 5 Replace
V2478
SL 4 Scrap
Yes
No
More than
2.0 Volt DC between
MP 134 (S2402 A) and
MP 135 (S2402 C)
No
Yes
Problem with
Volume Up
key
No
More than
2.0 Volt DC between
MP 132 (S2403 A) and
MP 131 (S2403 C)
Yes
Short circuit
between
MP 131 (S2403 C) and
MP PBA GND
No
SL 5 Replace
V2477
SL 4 Scrap
Yes
Remove
S2403
More than
2.0 Volt DC between
MP 132 (S2403 A) and
MP 131 (S2403 C)
No
SL 5 Replace
D2000
SL 4 Scrap
No
Replace
S2403
Yes
Press the
Volume Up key
S2403
Yes
0 Volt DC
between
MP 132 (S2403 A) and
MP 131 (S2403 C)
Problem
With all other
keys
No
Replace
X2410
Yes
Problem
solved
SL 5 Replace
D2000
SL 4 Scrap
Yes No
No
Claim
X2410
Yes
Replace
S2402
SL 5 Replace
D2000
SL 4 Scrap
START
Step 1:
Use TRS Fixture and connect Display and
Keypad. Connect: VBATT
Perform Keyboard Test in Service Tests
If All Keys working properly at the
TRS Fixture then replace Keypad. If not then
disconnect VBATT and continue with the
Key problems TRS guide
Key problems
START
Load ITP SW into the phone.
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
On Red LED
problems:
Use Fault Trace SW
MMI
LED and Backlight
Activate:
Red LED
More than
1.8 Volt DC at
MP 128 (C2427)
SL 5 Replace
N2000
SL 4 Scrap
No
Replace
V2428 Red LED Yes
On Keypad LED
problems:
Connect Keypad
Use Fault trace SW
MMI
LED and Backlight
Activate:
Keypad Backlight
If Keypad LED works
properly at the
TRS Fixture then replace
Keypad
Problem with all
Keypad LED
rows
4.5 Volt DC
at
MP 18 (TP4112)
Yes
Replace
N4101
Yes
Replace
X2410
No
No
Replace
X2410
Connect Keyflex to
the PBA
Use Fault trace SW
MMI
LED and Backlight
Activate:
Camera Keypad LED
More than
0.8 Volt DC at
MP 162 (R4114)
MP 164 (R4115)
MP 163 (R4116)
Keypad LEDs
Ok
SL 5 Replace
N2000
SL 4 Scrap
No
Claim Component
X2410 Yes
Replace
N4101 Yes
Replace
X2410 No
Camera Light Ring
problems:
Connect Single
Flash Assembly to
PBA
Use Fault trace SW
MMI
LED and Backlight
Activate:
Camera Light Ring
1.8 Volt DC
at
MP 20 (TP4106
AF_LED)
Yes
No
Connect Single
Flash Assembly to
PBA
Use Fault trace SW
MMI
LED and Backlight
Activate:
Autofocus LED
Replace
X2511
Replace
N4101
Problem with any
of the Keypad LED
rows
Yes
No
Problem with
Camera Keypad
LED
Yes
Problem with
Autofocus LED
No
Yes
No
More than
1.2 Volt DC
at MP 30 (R2544
LED_BACK)
SL 5 Replace
N2000
SL 4 Scrap
Yes
No
Replace
X2511
LED problems
/ LED Problems SEMC Troubleshooting Manual
11 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING Main Camera Problems
TROUBLESHOOTING
START
Load ITP SW
into the phone.
Use TRS Fixture and
Connect: Display and Main Camera Module
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
If the Main camera module is not connected
or not working properly the Fault Trace SW
will show an error message in the Trace
window.
Fault Trace SW
MMI
Misc
Activate:
Main Camera Test
No
2.8 Volt DC at
MP 32 (TP2204
VCAMAF)
1.8 Volt DC at
MP 76 (R2280
CAM_LDO_EN)
Replace
D2420
Yes
Replace
N2206
No
1.8 Volt DC at
MP 27 (TP2206
VCAMIO)
Yes
Replace
N2203
No
1.2 Volt DC at
MP 28 (TP2207
VCAML)
Yes
No
Yes
2.8 Volt DC at
MP 82 (ST2275
VCAMSA)
Replace
N2208
No
Yes
1.8 Volt DC at
MP 54 (TP2208
VCAMSD)
No
Is
Result GPIO_11
= High
Replace
D2420
No
Yes
Yes
Replace
X4301
26MHz at
MP 77 (R4301)
SL 5 Replace
D2000
SL 4 Scrap
No
Yes
Fault Trace SW
Logic
GPIO Manager
Application
GPIO_11 Read
Main Camera problems
Fault trace SW
MMI
Misc
Activate:
VGA Camera Test
No
1.8 Volt DC at
MP 76 (R2280
CAM_LDO_EN)
Replace
D2420
Yes
1.8 Volt DC at
MP 27 (TP2206
VCAMIO)
Replace
N2203
No
Yes
2.8 Volt DC at
MP 82 (ST2275
VCAMSA)
Replace
N2208
No
Yes
Replace
X4300
13MHz at
MP 77 (R4301)
SL 5 Replace
D2000
SL 4 Scrap
Yes
No
START
Load ITP SW
into the phone.
Use TRS Fixture and
connect Display and VGA Camera
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
If the VGA camera is not connected
or not working properly the Fault
Trace SW will show an error
message in the Trace window.
VGA Camera problems
/ VGA Camera Problems SEMC Troubleshooting Manual
12 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING Camera Door Problems
TROUBLESHOOTING
START
Load ITP SW
into the phone.
Insert the
Dummy Battery
Connect: VBATT and
DCIO/SEPI
Use Fault Trace SW
Fault trace SW
MMI
Misc
Activate:
Camera Door Test
Camera Door Test
Open/Close
Ok
Flash the Phone with
EMMA
SUCR SW
Yes
Camera Door
Open position
Ok
No
Disassemble the
phone
Use TRS Fixture
No
Fault trace SW
MMI
Misc
Activate:
Camera Door Test
3V, 225ms
Pulses shortly
after camera door test
activation at
MP 59 (TP2500)
1.8V,
225ms Pulses
shortly after camera door
test activation at
MP 91 (R2500)
No
Replace
D2420 No
Replace
N2500 Yes
3V, 225ms
Pulses shortly
after camera door test
activation at MP 55
(TP2502)
Yes
Replace
V2500
Replace
D2420
3V,
225ms
Pulses shortly
after camera door test
activation at MP 93
(V2505 Pin 4)
No
Yes
No
Replace
X2511 Yes
Yes
Disassemble the
phone
Use TRS Fixture
Fault trace SW
MMI
Misc
Activate:
Camera Door Test
3V, 250ms
Pulses shortly
after camera door test
activation at MP 58
(TP2501)
No
Yes
Camera Door problems
SL 5 Replace
N2000
SL 4 Scrap
Yes Clean Pad X2506
Clean Pad X2507
Yes
2.8 Volt Pk-Pk
Pulses at
MP 141 (C4206
VIBR_OUT)
No
Yes
No
SL 5 Replace
L4202
SL 4 Scrap
Connection
between
MP PBA GND and
MP 137 (X2507)
Ok
No
SL 5 Replace
L4203
SL 4 Scrap
Is any of
C4206 or C4207
Short circuit
2.8 Volt Pk-Pk
Pulses at
MP 136 (X2506)
No
SL 5 Replace
C4206 or C4207
SL 4 Scrap
Yes
START
Load ITP SW into the phone
Use TRS Fixture.
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
MMI-Misc
Activate:
Vibrator Test
If Vibrator is working properly at the
TRS Fixture then replace Vibrator if not
Continue with the Vibrator problems TRS guide
Vibrator problems
/ Vibrator Problems SEMC Troubleshooting Manual
13 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING Charging Problems
TROUBLESHOOTING
Yes
No
No
Battery Calibration.
Passed
Current Calibration
Passed
No
No
Flash with EMMA
SUCR SW
Go to
Charging Test
No
3.2V
and 4.1V DC
at MP 31 (TP2200)
during Battery
Calibration
SL 5 Replace
R2200
SL 4 Scrap
5 Volt DC at
MP 40 (C2201
DCIO)
Replace
System Connector
X2400
Phone
consuming more
than 10mA
Charger (DCIO)
Current
Yes
Start
Current Calibration
(C.C.)
SL 5 Replace
N2000
SL 4 Scrap
No
Replace
X2200
SL 5 Replace
N2000
SL 4 Scrap
Yes
Is
MP 29 (TP2202)
Short circuit
To GND
Yes
SL 5 Replace
C2423 and C2424
SL 4 Replace
V2421
Connection
between
PBA GND to Power
supply GND
Ok
Yes
No
Yes
Phone
Consuming
more than 10mA
DCIO Current
(During C.C.)
Yes
MP 47
(C2241 DCIO_INT)
Higher than
3,8 Volt DC
No
SL 5 Replace
N2000
SL 4 Scrap
No
MP 41 (R2201)
CHSENSEP Higher
than 3,8 Volt DC
(During C.C.)
Yes
R2201
0.1 Ohm YesYes
SL 5 Replace
R2201
SL 4 Scrap
No
MP 39
(V2202 Pin2)
CHREG Lower than
MP 47 (C2241)
(During C.C.)
No
Replace
V2202 Yes
SL 5 Replace
N2000
SL 4 Scrap
No
Yes
START
Perform System Connector Protection Test
Load ITP SW into the phone
Connect: Dummy Battery
Connect:VBATT and DCIO/SEPI
Use Fault Trace SW:
Logic, Phone Power
Perform
Battery and Current Calibration
It is very important to follow
instrument settings instructions
when performing the Battery and Current
Calibration Test.
Use TRS Fixture and
Fault Trace SW
Connect:
VBATT and
DCIO/SEPI
Start Battery
Calibration Test
Use TRS Fixture and
Fault Trace SW
Connect:
VBATT and
DCIO/SEPI
Charging problems
5 Volt DC at
MP 44 (ST2201)
No
Replace
System Connector
X2400
Yes
Replace
N2402
SL 5 Replace
N2000
SL 4 Scrap
Yes
5 Volt DC at
MP 108 (R2470/1)
Connect
DSU-60/ USB cable
from PC to
the phone
No 5 Volt DC at
MP 107 (R2470/2)
Yes
SL 5 Replace
R2470
SL 4 Scrap
No
START
Step 1:
Perform System Connector Protection Test
If step 1 is Ok then continue with step 2.
Step 2:
Use Phone with Normal SW
Use TRS Fixture
Connect: VBATT
USB/VBUS Charging problems
/ USB/VBUS Charging Problems SEMC Troubleshooting Manual
14 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING SIM Problems
TROUBLESHOOTING
START
Load ITP SW into the phone.
Use TRS Fixture.
Connect: Fixture Combo
reader to the PBA and
Insert Test SIM
Connect:
VBATT and DCIO/SEPI
Use Fault Trace SW
No
Sim Com Test
Passed
1.8 Volt DC
At MP SIM1
(Fixture Sim reader
Pin 1)
Yes
Yes
SL 5 Replace
C2410
SL 4 Scrap
SL 5 Replace
N2000
SL 4 Scrap
Replace
X2409 Yes
Remove Test SIM
and Insert
Dummy SIM
Restart the Phone
Use:
Fault Trace SW
Activate:
SIMVCC
SIMVCC on
Activate:
SIMRST
1.8 Volt DC at
MP 69 (TP2401) No
Yes
SIMVCC on
SIMRST on
Activate:
SIMCLK
1.0 Volt DC at
MP SIM3 (Fixture Sim
reader Pin 3)
Yes
SIMVCC on
SIMRST on
SIMCLK on
Activate:
SIM DATA
1.8 Volt DC at
MP SIM7 (Fixture SIM
reader Pin 7)
1.8 Volt DC at
MP 70 (TP2403)
Connection
Between MP PBA GND
and MP SIM5 (Fixture
Sim reader Pin 5)
Ok
No
No
Yes
No
SL 5 Replace
N2000
SL 4 Scrap
Yes
No
C2410
Short circuit
No
SL 5 Replace
N2000
SL 4 Scrap
Yes
Fault trace SW
Logic
SIM Card control
Activate:
SIM Com Test
Replace combo
reader and
Flash the Phone
with EMMA
SUCR SW
C2406
or C2411
Short circuit
No
SL 5 Replace
C2406 or C2411
SL 4 Scrap
Yes
C2408
Short circuit
No
Sl 5 Replace
C2408
SL 4 Scrap
Yes
No
10 Kohm
Between MP 50
(TP2400) and MP 70
(TP2403)
SL 5 Replace
R2419
SL 4 Scrap
No
Yes
1.8 Volt DC at
MP 50 (TP2400)
No Replace
X2409
Yes
1.8 Volt DC at
MP SIM2 (Fixture SIM
reader Pin 2)
No
Replace
X2409
Yes
1.0 Volt DC at
MP 65 (TP2402)
No
Yes
Replace
X2409
SL 5 Replace
N2000
SL 4 Scrap
SL 4 Replace
X2409
If still faulty
SL 5 Replace
N2000
SL 4 Scrap
SIM problems
Load ITP SW
into the phone.
Use TRS Fixture
Connect:
Fixture Combo reader to PBA
Insert Memory Card
Connect : VBATT and DCIO/SEPI
Use Fault Trace SW
Memory Stick Test
Passed
Yes
1.8 Volt at
MP 96 (SP2408
MCDATDIR)
Is
X2409
damaged
No Replace
X2409
Yes
Fault trace SW
Logic
SIM Card control
Activate:
Memory Stick Test
Replace Combo
Reader and
Flash the Phone
with
EMMA
SUCR SW
No
SL 5 Replace
D2410
SL 4 Scrap
Replace
D2460
No
0 Volt DC at
MP 105 (R2406
MSDETECT)
1.8 Volt DC at
MP 94 (R24102
CMDDIR
D2410 Pin 4)
No
1.8 Volt at
MP 95 (R24102
MCCMDDIR
D2410 Pin 3)
Yes
No
Yes
2.8 Volt at
MP 66 (R24105
MC_CLK)
1.8 Volt at
MP 100 (R2496
MCCLK)
No
Yes
1.8 V to 2.8V
at MP 63 (R24106)
to MP 64 (R24110)
Yes
Yes Replace
X2409
Replace
D2460
From High to
Low pulses Signal
At MP 98 (R2444) to
MP 99 (R2448)
Yes
No
SL 5 Replace
D2000
SL 4 Scrap
Yes
No
Disconnect Combo
reader and restart
the phone, measure
the pulses after
5 sec
Restart the phone
and measure the
pulses after 5 sec
Disconnect Combo
reader and restart
the phone, measure
the pulses after
5 sec
Cut the fence
according to the
repair instructions
for D2460. Restart
the phone and
measure pulses
after 5 sec.
No
Yes
Restart the phone
after each
measurement.
Measure pulses
after 5 sec.
Restart the phone
after each
measurement.
Measure pulses
after 5 sec.
1.8 V to 2.8V
at MP 103 (R2490)
Restart the phone
Measure pulses
after 5 sec.
No
Yes
Restart the phone .
Measure pulses
after 5 sec.
No
1.8 V to 2.8V
at MP 104 (R24101)
Replace
D2460
Yes
SL 5 Replace
N2000
SL 4 Scrap
No
SL 5 Replace
D2000
SL 4 Scrap
START
Memory Stick problems
/ Memory Stick Problems SEMC Troubleshooting Manual
15 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING Audio Internal Problems
TROUBLESHOOTING
Fault Trace SW
Audio and FM Radio
Audio Loop test
Audio Input: Mic1
Loop Mode: Analog
Audio Output:
Earphone
Apply Audio Loop
Whistle into the
PBA Mic
SL 5 Replace
N2000
SL 4 Scrap
Yes
Replace
Electret Mic or
X3105
Yes
More than
100mV AC Pk-Pk
at MP 43 (L3103 BEARP)
and MP 45 (L3104
BEARN)
No
2.2 Volt DC
at MP 106 (R3109
CCO_INTMIC)
No
More than
100mV AC Pk-Pk at
MP 37 (ST3100)
Fault Trace SW
Audio and FM Radio
Audio Loop test
Audio Input: Mic1
Loop Mode: Analog
Audio Output:
Loudspeaker
Apply Audio Loop
Whistle into the
PBA Mic
More than
100mV AC Pk-Pk
at MP 74 (X3102) and
MP 75 (X3103)
Yes
No
No
SL 5 Replace
N2000
SL 4 Scrap
More than
100mV AC Pk-Pk
at MP 1 (X3100) and
MP 2 (X3101)
Yes
No
SL 5 Replace
L3103,L3104,
L3110,L3111
SL 4 Scrap
1.9 Volt DC
at MP 74 (X3102) and
MP 75 (X3103)
Yes
No
Go to
Audio External
Problems
No
Is any of
C3137 and C3160
Short circuit
No
Replace
N3100
Yes
More than
100mV AC Pk-Pk
at MP 38 (C3137) and
MP 42 (C3160)
No
Yes
1.9 Volt DC
at MP 139 (V3101_Pin 1)
and MP 138 (V3101_Pin
2)
No
Yes
Yes
Replace
D2420
1.8 Volt DC
at MP 19 (TP3100
AMPCTRL)
Yes
No
START
Step 1: Perform
System Connector Protection Test
Step 2:
Use TRS Fixture. Connect Display
and Keypad. Connect VBATT and
perform Audio Service Tests. If all
Audio Service Tests work properly at
the fixture then replace Loudspeaker
or Earphone
If not then
Load ITP SW into the phone.
Use TRS Fixture.
Connect VBATT and DCIO/SEPI
Use Fault Trace SW
and continue with the Audio internal
problems TRS guide
No
SL 5 Replace
L3108 and L3109
SL 4 Scrap
Replace
V2405
2.2 Volt DC
at MP 35 (L3105
CCO1)
Yes
Replace
N2400
No
0 Volt DC
at MP 160
(V2405_ Pin 6)
Yes
Yes
SL 5 Replace
L3105
SL 4 Scrap
2.6 Volt DC
at MP 124 (ST2441)
Replace
Faulty Component
SL 5 Replace
N2000
SL 4 Scrap
Audio Internal problems
START
Step 1: Perform
System Connector Protection
Test
Step 2:
Load ITP SW into
the phone.
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
Fault trace SW
Audio and FM Radio
Audio Loop test
Audio Input: AUX1
Loop Mode: Analog
Audio Output:
AUX Earphone
Apply Audio Loop
SL 5 Replace
L2403 or L2404
SL 4 Scrap
Can you
hear at AUX
earphone when you
whistle in to the
AUX mic
No
More than
20mV AC Pk-Pk at
MP 109 (R3130 MICP_int)
and MP 89 (R3131
MICN_int)
Yes
L2403 and L2404
Ok
No
Yes
Replace
System Connector
X2400
Yes
No
No
Yes
No
Yes
No
Flash the Phone
with EMMA
SUCR SW
Yes
Yes
L2401
Ok
SL 5 Replace
L2401
SL 4 Scrap
L2402
Ok
SL 5 Replace
L2402
SL 4 Scrap
No No
Yes
Audio Internal
Tested
Go to
Audio Internal
problems
Yes
No
More than
20mV AC Pk-Pk at
MP 88 (C3155) and
MP 87 (C3156)
Replace
N3101
Yes
SL 5 Replace
N2000
SL 4 Scrap
No
Replace
System Connector
X2400
Replace
N3101
2.2 Volt DC at
MP 86 (R3156) Yes
SL 5 Replace
L3106 or N2000
SL 4 Scrap
No
Replace
System Connector
X2400
Disconnect
DCIO/ SEPI cabel
and Insert PHF set
Whistle into the AUX
mic
Connection
between
MP 115 (X2400_Pin 4)
and MP 111 (L2402)
Ok
Connection
between
MP 114 (X2400_Pin 3)
and MP 110 (L2401)
Ok
More than
80mV AC Pk-Pk
at MP 112 (L2403 SPL) and
MP 113 (L2404 SPR) When
whistle in to the
AUX mic
Audio External problems
/ Audio External Problems SEMC Troubleshooting Manual
16 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING FM Radio Problems
TROUBLESHOOTING
START
Go to
Service Tests and
Perform:
Speaker and
FM Radio Test
Fault trace SW
Audio and FM Radio
FM Radio
Audio Output
Loudspeaker
Frequency
According to
Instrument Settings
Set FM Radio
Yes
No
3.8 Volt DC
at MP 151 (ST2282)
and 1.8V at
MP 154 C3305
Any signal at
MP 156 (C3145)
MP 155 (C3146)
Yes
Signal
Ok
Claim
System Connector
X2400
SL 5 Replace
N2000
SL 4 Scrap
Yes
SL 4 Replace
N1400
SL 5 Replace
L3300 and C3306
No
Replace
System Connector
X2400
Load ITP SW
into the phone.
Use TRS Fixture
Connect VBATT and
DCIO/SEPI
Use Fault Trace SW
Speaker and
FM Radio Tests
working properly
No
Replace
N3101
PHF
working properly
during
Voice call
No Yes
Yes
Can you
hear 1KHz ton at
TRS Fixture
Loudspeaker
Yes
Replace
N1400
SL 4 Replace
V2425
SL 5 Replace
L2405 and C2434
Signal
Ok
Claim
Component
SL 5 Replace
N2000
SL 4 Scrap
SL 5 Replace
N2000
SL 4 Scrap
Disconnect:
DCIO/SEPI Cable
Connect:
Customized FM Radio Cable
Black Lab Plug to
TRS Fixture GND Input and
PHF Connector to the Phone
System Connector
Signal Generator
Instrument Settings:
Frequency:
Use free Freq. Channel
Example:
103 MHz in Sweden
Amplitude: 25.0 uVrms
FM Dev: +/-22.5 kHz
FM Rate: 1kHz
Yes
No
No
No
FM Radio problems
Signal
At MP 142 (X1400
BT_ANT)
Is
MOD 1 Freq.
Minimum 230 KHz
higher then
MOD 0 Freq.
No
Replace
N1400
Yes
-20dBm at
MP 142 (X1400
BT_ANT)
(±5dBm)
Yes
Yes
All channel
passed
Replace
BT Antenna
and clean
X1400 and X1401
Yes
Replace
N1400
No
-15dBm at
MP 78 (Z1400 Pin 1)
(±5dBm)
No
SL 5 Replace
C1402 and L1402
SL 4 Scrap
Yes
-15dBm at
MP 144 (Z1400_Pin 5)
and
MP 145 (Z1400_Pin 7)
(±5dBm)
No
Replace
N1400
No
SL 5 Replace
Z1400
SL 4 Scrap
Yes
26 MHz Signal
At MP 148 (R2118
BT_CLK)
No
No
2.7 Volt DC at
MP 14 (ST2212
VBT27)
Yes
1.8 Volt DC at
MP 9 (ST2208 VDDE18)
and 2.7 Volt DC at MP 34
(ST2213 VDIG)
Yes
SL 5 Check C2214
and C2215 then
Replace N2000
SL 4 Scrap
No
Replace
N1400
Yes
C2205
Short circuit
No
SL 5 Replace
C2205
SL 4 Scrap
SL 5 Replace
N2000
SL 4 Scrap
No
Yes
START
Flash the phone with the
EMMA SUCR SW and retest the phone.
If successful claim SW Flashing
If not then continue with
Bluetooth problems TRS guide.
Fault trace SW
TX and RX
Bluetooth
Channel 0
Set MaxPwr MOD 0
Use
Spectrum Analyzer
Instrument settings:
Frequency: 2402 MHz
Span: 1MHz
Amplitude: -5dBm
Use Peak Search
Fault Trace SW
TX and RX
Bluetooth
Channel 0
Set MaxPwr MOD 1
Use Spectrum Analyzer
with the previous
instrument settings
Change the
Bluetooth channels
In Fault Trace SW
and test the output.
Use
Spectrum Analyzer
Span 10MHz
Use Peak Search when
changing the channel.
Note:
1MHz channel spacing
Load ITP SW
Into the phone
Use TRS Fixture
Connect:
VBATT and DCIO/SEPI
Use Fault Trace SW
More than
60KOhm
between MP 148
(R2118) and
PBA GND
No Replace
N1400
SL 5 Replace
D2105
SL 4 Scrap
Yes
Bluetooth problems
/ Bluetooth Problems SEMC Troubleshooting Manual
17 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING GSM Network Problems
TROUBLESHOOTING
Yes
Load the ITP SW
into the phone.
Use TRS Fixture
Connect VBATT
and DCIO/SEPI
Use
Fault Trace SW
2.8 Volt DC at
MP 12 (ST2215
VccA)
0 Ohm
Between
MP 73 (R1201) and
MP 72 (L1200)
Connect Mobile Phone
Tester
Instrument Settings:
System Mode:
TX/RX Tester Mode (GSM)
GSM BAND: GSM850
RF Power ON: -60dBm
Measurement Mode:
Repeat, CW
Correction: 1.6dB
Fault Trace SW
TX and RX GSM
GSM Mode Settings:
RX Switched
GSM Radio Settings:
Select Band: GSM 850
Channel: 128
GSM RSSI Measurements:
Start RSSI Test
SL 5 Replace
N2000
SL 4 Scrap
NoNo
Replace
X1200
RSSI Test
Passed
No
Is
Max Pwr 23dBm
Ok
(±3dBm)
No
Perform RSSI Test at
GSM 900, 1800 and 1900 Band
Instrumet Settings
System Mode:
TX/RX Tester Mode (GSM)
GSM BAND:
E-GSM 900, Channel 124
E-GSM 900, Channel 975
DCS 1800, Channel 512
PCS 1900, Channel 512
Measurement Mode:
RF Power -60dBm, Repeat, CW
Yes
All Bands
Passed
RSSI Test
Replace
N1200 Thor
Fault Trace SW
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band : GSM 850
Channel : 128
Power Level: 5
Is
measured value
33dBm
(±3dBm)
Is
measured value
±5dBm
Go to
SERP Calibration
Instrument Settings:
System Mode:
TX/RX Tester Mode
(GSM)
GSM BAND: DCS1800
Measurement Mode:
Repeat, Burst
Fault Trace SW
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band : GSM 1800
Channel : 512
Power Level: 0
1.4V-1.6V Pk-Pk
Pulses at
MP 133 (R1000
VAPC)
No
Replace
N1200 Thor
No
No
No
Yes
Yes
Instrument Settings:
System Mode:
TX/RX Tester Mode (GSM)
GSM BAND: GSM850
Measurment Mode:
Repeat, Burst
Correction: 1.6dB
Instrument
Settings:
System Mode:
TX/RX Tester Mode
(WCDMA)
Downlink Channel:
10562
Measurement
Mode:
Repeat, Burst
Yes
Is
measured value
30dBm
(±3dBm)
Yes
Go to
WCDMA Network
problems
Use
Spectrum Analyzer
Instrument settings:
TX Freq: 824.2MHz
Span: 300KHz,
Amplitude: -5dBm
Measure with
RF Probe
Is
measured value
±5dBm
No
Yes
Fault Trace SW
Switch GSM Mode
Settings to:
TX Static
Yes
Signal at
MP 130 (Z1001)
-12dBm (±5dBm)
Yes
Replace
N1002
(Inside GSM module)
Fault Trace SW
Switch GSM Mode
Settings to:
TX Static
Use
Spectrum Analyzer
Instrument settings:
TX Freq: 1710.2MHz
Span: 300KHZ,
Amplitude: -5dBm
Measure with
RF Probe
Signal at
MP 129 (L1006)
-20dBm
(±15dBm)
No
No
No
Replace
N1200 Thor
Go to
SERP Calibration
Yes
Fault Trace SW
TX and RX WCDMA
Radio Settings:
Select Band:
BAND I
Fast Select
Channels:
Ch LOW
Modes: Max Pwr
23dBm
Yes
START
Yes
GSM Network problems
No
Load ITP SW
into the phone.
Use TRS Fixture
Connect:
VBATT: 3.8V, Limiter 3A
DCIO/SEPI: 5V, Limiter 2A
Use Fault Trace SW
START
Before TRS WCDMA
the GSM TRS guide
must be done!
0 Ohm
between
MP 73 (R1201) and
MP 72 (L1200)
Replace
X1200
Fault Trace SW
TX and RX WCDMA
Radio Settings:
Select Band:
BAND I
Fast Select Channels:
Ch LOW
Modes: Max Pwr 23dBm
3.4V-3.8V DC at
MP 84 (L2207
VCC_WPA)
3.4V-3.8V DC at
MP 80 (L2210
VBATI)
No
1.8Volt DC at
MP 81 (R2220
DCDC_EN)
Yes
SL 5 Replace
D2000
SL 4 Scrap
No
Instrument Settings:
System Mode:
TX/RX Tester Mode
WCDMA
Downlink Channel:
BAND I: 10562
BAND II: 9662
BAND V: 4375
Measurement Mode:
Repeat
Correction: 1.6dB
SL 5 Replace
L2210
SL 4 Scrap
No
1.3V-1.8V DC at
MP 83 (R2221
WPAVCC)
Yes
SL 5 Replace
N2000
SL 4 Scrap
No
Replace
N2205 Yes
Max Pwr.
23dBm (±3dBm)
all bands
Ok
Yes
Current
consumption
between
500 – 800 mA
No
Replace
N1200 Yes
Go to
SERP
Calibration
Replace
N1210
No
Instrument Settings:
System Mode:
TX/RX Tester Mode
WCDMA
Downlink Channel:
BAND I: 10562
BAND II: 9662
BAND V: 4375
Measurement Mode:
Repeat
RF Power: ON (-60dBm)
Correction: 1.6dB
Fault Trace SW
TX and RX WCDMA
Radio Settings:
Select Band :
BAND I, II, V
Fast select channels:
Ch LOW
Modes: Read RSSI
RX On:
Read Measurement
Test Read RSSI
for each WCDMA Band
Only one WCDMA Band
at the time
Yes
Phone reports
correct values
At all bands
(±3dBm)
No
Go to
GO-NOGO
Test
Yes
Are any of
X1201,
X1202 or X1203
damaged
Yes
Replace
Faulty Component
No
Yes
Fault Trace SW
TX and RX WCDMA
Radio Settings:
Select Band:
BAND I, II and V
Fast Select Channels:
Ch LOW
Modes: Max Pwr 23dBm
Test Max Pwr 23dBm
for each WCDMA Band
Only one WCDMA Band
at the time
WCDMA Network problems
/ WCDMA Network Problems SEMC Troubleshooting Manual
18 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING Xenon Flash Problems
TROUBLESHOOTING
Yes
No
No
START
Load ITP SW
into the phone.
Insert Dummy Battery
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
Fault trace SW
MMI
Led and Backlight
Activate:
Xenon Flash Test
Xenon Flash Test
Ok
Flash the Phone with
EMMA
SUCR SW
Disassemble the
phone
Use TRS Fixture
Connect Display and
Main Camera
Fault trace SW
MMI
Led and Backlight
Activate:
Xenon Flash Test
Disconnect
Main Camera
1.8 Volt DC
At
MP 92 (R4305)
1.8 Volt DC
At
MP 90 (R4304)
Replace
D2420
No
SL 5 Replace
D4300
SL 4 Scrap
Yes
Replace
X2511
Yes
Problem
solved
SL 5 Replace
D2000
SL 4 Scrap
No
Claim Component
X2511
Yes
Xenon Flash problems
SEMC Troubleshooting Manual
19 (101)

K850
1203-2528 rev. 1
TROUBLESHOOTING System Connector Protection Test
TROUBLESHOOTING
Current Consumption Test
Step 1:
Insert Local SIM Card and use the phone with the Normal SW (SSW) and dummy
battery connected to Power Supply Channel 1 VBATT according to Picture 1.
Instrument settings: Voltage: 3.8 Volt, Limiter 3A.
Measure the current when Phone is off. Check the current consumption at Power
Supply Channel 1 VBATT.
Picture 1
Current consumption in off mode should be less than 1mA.
If more than 1mA go to Dead Phone problems part 1 TRS guide.
Step 2:
Start the phone:
Measure the deep sleep current max 6mA typical between 0-3mA.
Make sure that the operator is running with deep sleep. (This operation can be
switched off by operator if the network is busy).
If phone using more than 6mA, then go to EMMA III and perform Software Update
Contents Refresh (SUCR).
Step 3 with Mobile Phone Tester Instrument
Insert Test SIM Card and use the phone with the Normal SW (SSW) and dummy
battery connected to Power Supply Channel 1 VBATT according to Picture 1.
Instrument settings: Voltage: 3.8 Volt, Limiter 3A.
Use Mobile Phone Tester Instrument in signalling mode direct connected to the
phone with RF Connector or use Shield Box if not possible. Phone Display must be
on during these tests to get correct current measurements.
Perform Radio TX measurements at GSM and WCDMA Band and compare with limits
according to text below.
System Connector Protection Test
Perform Diode and Ohm measurements with DMM
Connect the black probe at ground (Pin 9 system connector)
Pin at
X2400
Diode
Measurement
/ Volt
Ohm
Measurement
/ Ohm SL 4 Action SL 5 Action
10L 0L N2402 if Not 0L C2422 if Not 0L
20.0 1.4 No Action L2405 If higher than 1.4Ω
32.0 12K
N3101 if lower than 12KΩ
L2401 if higher than 12KΩC2421 If lower than 12KΩ
41.0 1K
N3101 if lower than 1KΩ
L2402 if higher than 1KΩC2420 if lower than 1KΩ
52.0 9K
N3101 if lower than 9KΩ
L2403 if higher than 9KΩC2416 if lower than 9KΩ
62.0 9K
N3101 if lower than 9KΩ
L2404 if higher than 9KΩC2415 if lower than 9KΩ
70L 0L Not connected Not connected
81.4 1.5K V2420 if lower than 1.5KΩ
R2451, R2440, R2436
if higher than 1.5KΩ
90 0 No Action
R2455 if Not 0Ωbetween
X2400_Pin9 and PBA GND
10 0.7 200K-470K N2401if lower than 200KΩ
D2450 if lower than
200KΩR2465 if higher
than 470KΩ
11 1.0 200K-470K N2401if lower than 200KΩ
D2450 if lower than
200KΩR2466 if higher
than 470KΩ
12 0L 80K V2421 if lower than 80KΩ
C2423, C2424
if lower than 80KΩ
/ Current Comsumption Test SEMC Troubleshooting Manual
20 (101)