Internal Display Problem - LeCroy WaveSurfer 400 Series Service Manual

6.10.6 Internal Display Problem

T
HIS PROCEDURE ASSUMES THAT
VIDEO IS PRESENT ON AN EXTERNAL
*
MONITOR CONNECTED TO THE REAR PANEL OR
THAT THE FRONT PANEL BECOMES ACTIVE AS IF
THE SCOPE HAD BOOTED UP AND IS
OPERATIONAL
*External monitor must be connected to rear panel connector before power is turned on to scope.
*External video will not be present after Windows starts booting unless it is enabled from within
Windows however it will be visible for ~30 seconds after power on..
V
ERIFY THAT THE CABLE IS
CONNECTED BETWEEN THE
BOARD AND THE
V
ERIFY THAT THE CABLE IS
CONNECTED BETWEEN THE
TFT
BOARD AND THE
BOARD
M
EASURE THE VOLTAGE AT THE
TFT
INPUT TO THE INVERTER
( 1 & 2)
PINS
I +12V
S PRESENT
Y
ES
M
EASURE THE VOLTAGE AT
OF THE INPUT CABLE TO THE
TFT . (B
INVERTER ACKLIGHT
C ?)
ONTROL
I +12V?
S IT
Y
ES
R I
EPLACE NVERTER
R TFT & T
EPLACE OUCH
CPU
TFT
CPU
INVERTER
? T
N ROUBLESHOOT
O
P 5
IN
R CPU
N
EPLACE
O
S
CREEN
C
AUSE
BOARD
Maintenance 6-53