When
the input button
is pressed on the
receiver or remote, is
the on screen
display clear and
normal?
NOYES
Using the
power distribution
diagram, are the
voltages normal at CN8
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 and dark
areas on the
screen?
NO
If the LCD Control
Board (T-con) 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
CN3. 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.
SMART2009-LCD509-V4 Page 5 of 11
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