Power Failure - Toshiba 50HP82 Service Manual

1. Power failure

(1) POWER is turned OFF.
Turn on the main power unit.
Is the POWER LED lit?
YES
• To "Flashing in green" (2) (P3).
(FAN error detection)
• To "Flashing in red" (3) (P4)
(Temperature error detection)
• To "Flashing in green and red"
(4) (P5).
(Panel crack detection)
From (4): Flashing in green
and red (Panel crack detection)
(P4)
NO
Is the power plug connected
to the wall outlet correctly?
Is 100V AC available behind
the fuses F1 and F2?
Is the M+7V output available
at Pin 1 of the PM connector?
Is the M+5V output available
at Pin 2 (MAIN) of IC7005?
Is the M+5V output available
at Pin 5 of the LD connector,
Pin 4 of the PW connector,
and Pin 5 of the RS connector?
IC7001 and peripheral cir-
cuits are out of order.
2
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Poor power plug connection
Fuses F1 and F2 have blown
out.
If the fuses are replaced
and they blow out again,
the POWER unit is out of
order.
If the PW and RS connectors
are disconnected from one
after another and an output
of M+7V is generated, this
is a problem in a circuit
beyond the connectora.
If no output is generated at
that time, then the POWER
unit is out of order.
S2601 (PWR) and associ-
ated circuits are out of order.
The +5V line is out of order
toward the LED PWB,
PWR, PWB, or 232C PWB.