System Connector Protection Test; Current Consumption Test - Sony Ericsson C903 Troubleshooting Manual

System Connector Protection Test

Perform the Ohm measurements by using the DMM instrument (Fluke).
T
Note! he Battery must be removed from the Phone during this test.
Note! Connect the Black probe to the X2405_PIN 9 (GND).
PIN_1 PIN_9 GND PIN_12
System Conn. Ohm
SL 4
X2405 Measurements
(Repair Action)
(PIN Position) (Ohm)
L2468
1 0L N2421 if lower
C2439 if lower
2 0 L2406 if higher
L2401 if higher
3 10k - 12k
N3101 if lower or higher
L2402 if higher
4 0.9k – 1.1k
N3101 if lower or higher
L2403 if higher
5 0.9k – 2.2k
N3101 if lower or higher
L2404 if higher
6 0.9k – 2.2k
N3101 if lower or higher
7 75 V2430 if lower
V2417 if lower
8 350k – 700k
N2422 if lower or higher
9 0 Ohm GND R2449 if higher
Z2400
10 35k – 0L V2421 if lower
N2420 if lower
Z2400 if higher
11 250k – 360k V2420 if lower
N2420 if lower or higher
R2490 if higher
V2412 if lower
12 85k – 110k
V2202 if lower
C2440 if lower
TROUBLESHOOTING System Connector Protection Test - Current Consumption Test
SL 5
(Repair Action)
X2405
X2405 if higher
X2405 if higher
C2462 if lower
X2405 if higher
C2463 if lower
X2405 if higher
C2448 if lower
X2405 if higher
C2447 if lower
X2405 if higher
C2445 if lower
L2405 if higher
C2444 if lower
N2700 if lower or higher
X2405 if higher
R2434 if higher
R2468 if higher
X2405 if higher
X2405
R2445
C2461 if lower
X2405 if higher
R2446 if higher
C2460 if lower
C2441 if lower

Current Consumption Test

Step 1:
Insert a Local SIM Card and use the phone with the Signalling SW (SSW).
Use Dummy Battery connected to Power Supply Channel 1 (VBATT).
Instrument settings: Voltage: 3.8 Volt, Limiter 3A.
Note! The Dummy Battery should have approximately 120K Ohm resistance between GND
and BDATA.
Measure the current consumption when Phone is turned off.
Take a note of the current consumption at Power Supply Channel 1 (VBATT).
The Current consumption in off mode should be less than 1mA.
If more than 1mA go to Dead Phone Problems part 1 TRS
Step 2:
Turn the Phone On:
Measure the deep sleep current max 6mA typical between 0-3mA. Make sure that the
operator is running with deep sleep mode.
Note! This operation can be switched off by operator if network is busy or heavily-loaded.
If phone using more than 6mA, then go to EMMA and run Software Update Contents Refresh
(SUCR SW).
Step 3 with Fault Trace SW application:
- Flash the phone with ETS SW
- Use Dummy Battery connected to the Power Supply Channel 1 (VBATT)
- Use Fault Trace SW
Connect the:
- Dummy Battery connected to the Power Supply Channel 1 (VBATT):
Instrument settings: Voltage: 3.8 Volt, Limiter 3 A
- Connect DCIO/SEPI to the phone:
Instrument settings: Voltage: 5 Volt, Limiter 2 A
Perform the following tests:
- Max TX Power GSM 850 MHz
Fault Trace SW settings:
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band: GSM 850
Channel: 128
Power Level: 5
Limits GSM 850 MHz
- Transmitter Current Limits: 300mA
- Tolerance: ±20%
SEMC Troubleshooting Manual
C903
guide.
1228-1147 rev. 1 33 (129)