K850
1203-2528 rev. 1
TROUBLESHOOTING
Dead Phone Problems
TROU
B
L
E
S
H
O
OTIN
G
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
Yes
No
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
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