Toshiba 42HL67 - 42" LCD TV - Second Level Video Troubleshooting: Backlight; Backlight Functionality Checks

Does the back light
function and then turn
off?
YESNO
Replace the
LCD display.
Is
24 VDC present
at pins 1 and 5 of P804
when the unit is
turned
on?
YESNO
Replace the
Main Power
supply.
Is
6VDC present at pin 8
of CN91A when the unit
is turned on?
NO
YES
Replace the
Low B power
supply.
Is
3.3 VDC present at
pin 7 of P812A shortly
after the unit is turned
on?
YES
Replace the
SYSCON
section.
NO
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