When
the input button
is pressed on the
receiver or remote, is
the on screen
display clear and
normal?
NO
YES
Using the
power distribution
diagram, are the
voltages normal at P802
of the power supply
module?
NO
Suspect the
power supply
module.
YES
Replace
the Main
Module.
No or distorted
video
Does
the back light function
normally when the unit
is turned on?
YES
NO
Troubleshoot for
backlight problelms.
Is
the screen discolored
or does it have streaks
or dark areas with no
signal input?
NO
If the LCD Control
Board is available, try
it. If this does not help,
replace the LCD
display panel. ***
YES
Examples
*** Warranty Authorization required if
display is replaced in warranty – Go
to www7.toshiba.com for instructions.
Check for LVDS activity at
CN5. If it is present suspect a
problem with the display control
board (Tcon). If it is not present
replace the main PCB.
This signal viewed from
LVDS connector
referencing cold ground.
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