Toshiba 42HL67 - 42" LCD TV Service Manual page 11

Is
Yes
5VDC present at pin 13
of P811A with the unit
plugged in?
Suspect the
system
control
(SYSCON)
circuit.
No
Is
Yes
5VDC present at pin 1
of P806A when the unit
is plugged in?
Yes
No
Suspect the
Low B supply
circuit.
Dead set – No
sound or picture
Does
Yes
3VDC appear at pin 3
of P806A when on-off is
pressed?
No
Suspect the Low B
supply, then the main
power supply circuit.
Is
No
18 VDC present at pin 7
of P806A when the unit
is plugged in?
Suspect the
main power
supply circuit.
10 10
Are
any problem
No Yes
LED indications
exhibited after the
power button is
pressed?
the LED blink
chart to help
locate the
problem.
Use