Keyboard & Display Backlight - Sim - Sony Ericsson K800 Electrical Repair Manual
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Also See for K800:
- Working instruction, mechanical (74 pages) ,
- White paper (55 pages) ,
- Quick manual (2 pages)
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Keyboard and Display backlights problems
Load the ITP Sw into
Fault trace SW
the phone.
MMI
Use fixture
Start
Connect 3.8V
LCD backlight
Insert display
Lower keyboard bac
and Keyboard
Upper keyboard bac
Use fault trace SW
Display backlights
works
No
Yes
3.8V at
Keyboard backlights
MP 16
works
TP 3100
Yes
Flash with EMMA
Run SUCR
No
No
SL 5 Replace
R3104
SL 4 scrap
3.8V at
Yes
MP 32
Keyboard backlights
Keyboard backlights
Upper works
Upper works
Yes
No
0 Volt at
Replace or resolder
Yes
MP 20
X2501
TP3105
No
1.8 Volt at
Scrap
No
MP 97
D2000 faulty
Replace
Yes
V3103
TROUBLESHOOTER
47 Ohm
Yes
START
Between MP 94
And ground
Replace
No
R3101
15 V ptp
Pulses at MP 16
Replace
Yes
Yes
short after
X3102 or Display
Lcd bachlights
Is set.
No
3.8 V ptp
Pulses at MP 27
Replace
No
short after
N2000
Lcd bachlights
Is set.
Replace
Yes
V3101
3.8V at
Replace
No
Yes
Annode
V3102
V3102
SL 5 Replace
No
R3100 or L3103
SL 4 scrap
0 Volt at
Yes
MP 18
TP3105
No
1.8 Volt at
No
MP 98
Yes
Trouble Shooting Guide Keyboard & Display Backlight - SIM
Load the ITP Sw into
the phone.
Fault trace SW
Use fixture
Logic
Connect 3.8V
SIM Card control
Insert SIM
Use fault trace SW
Remove SIM
Restart the phone
No
Run SIM com test
Use fault trace
Passed
SW
Yes
Flash with EMMA
2.8 Volt at
Run customize
Pin 1 X2302
or refresh
MP 129
Yes
SIMVCC on
2.8 Volt at
Start
Pin 2 X2302
SIMRST
MP 125
Yes
SIMVCC on
2.8 Volt at
SIMRST on
Pin 3 X2302
Start
MP 124
SIMCLK
Yes
SIMVCC on
SIMRST on
2.8 Volt at
SIMCLK on
Pin 7 X2302
Start
MP 123
SIM DATA
Yes
Replace or
Pin 5 X2302
No
Resolder
Ground
X2302
Yes
Sl 5 Replace or
10Kohm between
No
Resolder R2308
Pin 1 and 7
Sl 4 scrap
X2302
SEMC Electrical Repair Manual
SIM problems
Check X2302
No
Start
faulty
Replace or
Yes
resolder
X2302
Start
SIMVCC
SL 5 Replace C2309
Yes
C2310 or C2314
SL 4 scrap
C2309, C2310
Replace
No
No
or C2314
N2000
Short circuit
SL 5 Replace
Yes
C2313
SL 4 scrap
C2313
Replace
No
No
Short circuit
N2000
Sl 5 Replace
C2311
Sl 4 scrap
2.8 volt at
ST2306 K790
C2311
No
No
R2306 K800
Short circuit
SIMCLK_2
Yes
No
Sl 4 Resolder or
Replace
replace X2302
N2000
Sl 5 replace R2306
2.8 Volt at
ST2307 K790
C2312
No
No
R2307 K800
Short circuit
SIMDAT_2
Yes
Sl 4 Resolder or
Sl 5 Replace
Replace X2302
C2312
Sl 5 replace R2307
Sl 4 scrap
Replace
Yes
N2000
1202-3085 rev. 2
K800 - K810
Yes
No
Yes
52
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