C702
1221-7857 rev. 1
TROUBLESHOOTING
TROU
B
L
E
S
H
O
OTIN
G
Display Illumination Problems - Key Problems part 1
START
Step 1:
Use TRS Fixture
Connect Display and Keypad.
If the Display is working properly at the
TRS Fixture then replace the Display
If not then continue with step 2.
Step 2:
Load ITP SW into the phone
Use TRS Fixture
Connect: Display
VBATT and DCIO/SEPI
Continue with the
Display Illumination Problems TRS guide
No
Display Backlights
Ok
SL 5 Replace
N2000
SL 4 Escalate
No
3.7 V - 3.8 V DC
at MP 58 (TP4200)
Fault trace SW
MMI
Misc
Activate:
Display Backlight
15 Volt DC
at MP 58 (TP4200)
Replace
X4202
Yes
3.7 V - 3.8 V DC
at MP 37 (V4201
Anode)
No
SL 5 Replace
L4201 and L4203
SL 4 Escalate
No
SL 5 Replace
V4201
SL 4 Escalate
Yes
Yes
4.5 Volt
Pk-Pk Pulses
(
±
0.5V) at MP
V4200_Pin 3
No
SL 5 Replace
V4200 or L4200
SL 4 Escalate
Yes
Yes
0 Volt DC at
MP 57 (TP4201) when
Display Backlight
Is On
Yes
SL 5 Replace
V4206 or N2000
SL 4 Escalate
No
Flash the phone with
EMMA SUCR SW
Disconnect Display from the PBA
Use Fault trace SW and go to:
MMI
Misc
Deactivate:
Display Backlight
Fault trace SW
MMI
Misc
Activate:
Display Backlight
Display Illumination problems
START
Step 1:
Use TRS Fixture
Connect: Display, Keypad and VBATT
Step 2:
Perform Keyboard Test in Service Tests Menu
If All Keys are working properly on the
TRS Fixture then replace Keypad
If not then continue with the
Key Problems TRS guide part 1
Problem with
Phone
On Key
Problem with
Phone
Off Key
No
SL 5 Replace
V2402
SL 4 Escalate
Yes
Yes
3.6V-3.7V DC
at MP 49
(V2402_Cathode)
Remove
S2504
No
3.6V-3.7V DC
At MP 49
(V2402_Cathode)
SL 5 Replace
V2505 or N2000
SL 4 Escalate
No
Replace
S2504
Yes
Press the
On/Off Key
S2504
Yes
0 Volt DC at
MP 49
(V2402_Cathode)
Yes
Replace
S2504
No
Problem with
Volume Down
Key
1.8 Volt DC at
MP 73 (S2502_Pin C)
and MP 75
(S2502_Pin D)
Yes
Press the
Volume Down Key
S2502
Yes
0 Volt DC at
MP 73 (S2502_Pin C)
and MP 75
(S2502_Pin D)
SL 5 Replace
V2511 or D2000
SL 4 Escalate
Yes
Replace
S2502
No
Remove
S2502
No
1.8 Volt DC at
MP 73 (S2502_Pin C)
and MP 75
(S2502_Pin D)
Replace
S2502
SL 5 Replace
V2511 or D2000
SL 4 Escalate
No
Yes
No
Go to
Key Problems part 2
No
Key Problems part 1
SEMC Troubleshooting Manual
11
(115)
Summary of Contents for C702
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