Backup Capacitor Test; Charging Test - Sony Ericsson W995 Troubleshooting Manual

Backup Capacitor Test

To perform this test use:
- Phone with the ETS SW
- Power Supply Channel 1 VBATT: Instrument settings: Voltage: 3.8V, Limiter: 2A
- Power Supply Channel 2 DCIO/SEPI: Instrument settings Voltage: 5V, Limiter: 2A
This test should be performed in 3 steps:
Step1:
Measure the voltage at the Back up capacitor by using Fault Trace SW- Logic -
ADC Values – Read ADC Value (Reading 1).
Step2:
This step should be made 30 seconds after Step 1. Measure the voltage at the
Backup capacitor by using Fault Trace SW - Logic – ADC Values - ADC Channels
– Read ADC Value (Reading 2).
Step3:
Compare the difference between Reading 1 and Reading 2 with the reference table
below. If the Reading 1 value is between 50 and 680 go to Interval 1, if between 681
and 800 go to Interval 2, if between 801 and 880 go to Interval 3 and compare with
the Reading 2 – Reading 1 Min and Max Limits.
Reference Table:
Min
Absolute readout 50
Reading 1
Reading 1 (Dec) Reading 2 – Reading 1 (Dec)
Min
Interval 1 (50 – 680) 20
Interval 2 (681 – 800) 5
Interval 3 (801 – 880) 0
Note! The upper table contains the absolute limits for the readouts. The lower table
contains the allowed delta between the first and the second readout, separated in
time with 30 seconds.
Note! If the readings are out of limits then SL 5 replace C2233 (Backup Capacitor)
If the problem persists then SL 5 Replace N2000
TROUBLESHOOTING
Max Unit
880 Dec
Max
210
30
10
SL 4 Escalate.
Backup Capacitor Test - Charging Test
To perform this test use:
Phone with the Signalling SW (SSW)
-
Dummy Battery connected to Power Supply Channel 1 (VBATT)
-
Note! The Dummy Battery should have approximately 27K Ohm resistance between
GND and BDATA.
Power Supply Channel 1 (VBATT)
-
Instrument settings:
Voltage: from 3.0 Volt to 4.2 Volt, according to VBATT row in the Reference Table.
Limiter: 2A
Power Supply Channel 2 (DCIO/SEPI)
-
Instrument settings:
Voltage: 5V
Limiter: 2A
Test instructions:
Disconnect the DCIO/SEPI Cable between each measurement and wait for phone to shut down when
-
changing VBATT voltage.
Take a note of the current measurements at Power Supply Channel 2 DCIO/SEPI and Display Charging
-
Indicator X seconds after DCIO/SEPI cable has been inserted according to the Test Time row in the
reference table below.
Compare the test results with the reference table below, tolerance +/-20%.
-
Reference Table
VBATT x
Volt 3.0v 3.1v 3.2v 3.3v
Test Time
x sec. 15s 15s 15s 25s
DCIO/SEPI
Current
mA 250mA 250mA 250mA 500mA 600mA
Display
indicate
charging Nothing Nothing Nothing Yes
Note! The Power Supply Channel 1 (VBATT) must allow reverse current.
If the charging current is NOT equal to the reference table then go to:
If the charging current is equal to the reference table then insert the normal battery and test the charging
current to verify that the phone battery is working properly.
Measure the voltage at the battery to define the current level.
If the battery is receiving the right current the phone and the battery are working properly.
SEMC Troubleshooting Manual

Charging Test

3.4v 3.5v 3.6v 3.7v 3.8v 3.9v 4.0v
25s 25s 30s 30s 30s 30s 30s
700mA 900mA 900mA 900mA 900mA 900mA
Yes Yes Yes Yes Yes Yes Yes
Charging Problems TRS Guide
1230-1858 rev. 1
W995
4.1v 4.2v
30s 45s
850mA 0mA
Fully
Yes Charged
35 (125)