Network Problems - Display Problems - Sony Ericsson K800 Electrical Repair Manual

Network problems
Connect Mobile
Service tester
GSM 900
Channel 001
RF Gen -40dBm
2.75 Volt at
Yes
MP 35 VccA
Fault trace SW
MP 34 VccB
TX and RX
GSM
GSM Mode settings
RX Switched
GSM Radio settings
GSM 900 channel 1
GSM RSSI No
Measurement
Read RSSI
RSSI
Test RX equal to
Yes No
1800 and 1900 MHz -40dBm
RSSI 2db tolerence
Fault trace SW
TX and RX
GSM
RSSI
GSM Mode settings
Yes No
All band
TX Switched
Passed
GSM Radio settings
GSM 900 channel 1
Powerlevel 5
Set the Mobile
Service tester
No
To GSM 900
Channel 001
TX Analyzer
Yes
Test TX
1800 and 1900 Mhz
Measure
Powerlevel 0
No
30dBm
Set the Mobile
All band
Service tester
to the right channel
Yes
Fault trace SW
TX and RX
WCDMA
Fast select channels Measure
Set Mid Channel 23 dBm Tolerence
No
Modes 3dB at Channel
Max PWR 23dBm 9750
Set the Mobile Service
tester to WCDMA TX
Channel 9750
Yes
Fault trace SW
TX and RX
WCDMA
Fast select channels
Set Mid Channel
Modes
Read RSSI
RX On
Read measurement
Set the Mobile Service
Channel 10700
Tester to RX -60dBm.
TROUBLESHOOTER
Load the ITP Sw into
the phone. Start
Use fixture
Connect 3,8V
Limiter 3A
Use fault trace SW
Yes
0 Ohm between
Replace N2000 Mp115
And MP118
No
RSSI between
Yes
-40dBm Replace X1000
And -60dBm
No
Replace
A1300 Marlin
Yes
1.3 V Pulses at
Replace
No
MP 36
N2000
VACP
Replace
A1300 Marlin
Yes
Using between
Replace
No
600 mA to 800mA
A1200 Ray
Current.
No
Phone Reported
Run SERP
Yes
Power -60dBm
calibration
Tolerence 5db
Trouble Shooting Guide Network Problems - Display Problems
Display problems
Go to Keyboard and
No
Display backlights Display backlights
problems works
Yes
Restart
Replace
the test
Display
Display works
No
Remove
Display
Restart the test
1.8V at
Replace MP 88
N2000 Pin 4
X3102
No
Yes
2.75V at
2.75V at
MP 91
No
MP 91
Pin 3 and 24
VDIG
X3102
Yes
Yes
Ground at
Scrap Pin 5 13
PCB faulty 14 and 22
X3102
Yes
Scrap
C3200 to C2313
No
D2000
Short circuit
Faulty
SEMC Electrical Repair Manual
START
Fault trace SW
MMI Load The ITP into
Display pattern the phone
Start Use fixture
Tri color pattern Connect 3.8V
Insert display
Use fault trace SW
Claim
Yes
Display
Replace
No
N2000
1.8V at
No
MP 37
VDDE18
Scrap
Yes
PCB faulty
Replace
No
X3102
SL 5 Replace
Yes
C23xx
SL 4 Scrap
1202-3085 rev. 2
K800 - K810
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