Display Faults - Nokia 6088 Baseband Description And Troubleshooting

6088 (RM218)
Baseband Description and Troubleshooting

Display Faults

Display
Faults
Are the backlight
LEDs turned on
when the mobile
terminal is turned
on or when making
a call?
YES
Display
Faults 2
Page 38 © 2006 Nokia Corporation
Check voltage
across C225 > 9V.
NO
Is it okay?
No
Measure battery
voltage at D221
pin1. Is it okay?
YES
Check/change
D221, L223,R226,
,and R7043. Is each
one okay?
YES
Measure
BACKLIGHT_EN at
U220_pin4. Is it
change to high?
YES
Check U220_pin1. Does it
switch between 0V and
VPH_PWR?
YES
Check U220_pin3 <
0.263 V. Is it okay?
YES
Replace U220 and
retest
Replace LCD Module
Yes
Check/ change
battery, VPH_PWR
NO
trace and FPC
connection.
Replace the
component and
NO
Backend IC is
NO
defective. Replace
LCD Module
NO
Check R7041,
NO
R7042 and C6241.
Company Confidential
retest
Replace U220 and
retest.
Issue 1 10/2006