Toshiba 47HL167 Service Manual page 13

NO
Is
24 VDC present
NO
at pins 1 and 5 of P804
when the unit is
turned
on?
Replace the
Main Power
supply. NO
Is
YES
3.3 VDC present at
pin 7 of P812A shortly
after the unit is turned
on?
Replace the
Low B power
supply.
12
YES
Does the back light
function and then turn
off?
Replace the
LCD display.
YES
Is
YES
6VDC present at pin 8
of CN91A when the unit
is turned on?
NO
Replace the
SYSCON
section.