Table of Contents
Advertisement
Display failures
missing line
segments or no
display function
no display back
light
Black lines on the display or no display function
Check if the display have some mechanical breaks around the corners
Check VBB 2,8V DC on C400 and R420
Change the Display
version 1.0 / 05.11.1999
CONFIDENTIAL
Display failure
check the display
of mechanical
Yes
appearance
not ok
check VDC_OUT
3,2VDC on V406,
Yes
V409, V412, V413
not oK
If no VDC_Out
voltage PCB will
be brocken
Service & Analysis Center Europe
Check VBB 2,8V
oK
DC on C400 and
R420
not oK
check the VBB
voltage on V117
check the LCD_LED line
pin 9 N400 to V406,
V409, V412, V413
oK
on"=1,2V DC/
"
"off"=1,9V DC
Training Team
change the
oK
display
swap the
oK
handset
because the
PCB is faulty
check pin 1 N400
VDC_OUT, pin 2
VBB, LCD_LIGHT
faulty
pin 7 "on"=2,8V,
R415 12K Ohm pin 8
to ground
Page 23 of 37
Hide quick links:
Advertisement
Table of Contents
