Pioneer PDP-R03U Training Manual page 52

Power switch on, but no power
(Front LED indicator does not change from red to green, but remains in red.)
Are the MDR and DVI cable connectors (white
and gray) properly connected with the PDP
and the set as well?
YES
Is the PDP's power switch on?
YES
Is the M+10V line as specified?
YES
Is the impedance of the M+10V line
as specified? (Measure the resistance
between F1702 and GND.)
Do the +5V line (pin (10) of P1703),
NO
+2.5V line (pins (5) and (6) of P1702),
and +3.3V line (pin (8) of P1702) all
function?
YES
Check the set's wire harnesses,
FFCs and other parts for their
connections.
NO
Reinsert the connectors, and turn on the
power again.
NO
Turn on the PDP's power switch.
NO
Is the PS_ON terminal (pin (1) of CN703) at HI
(3.5V)?
YES
YES NO
Are there voltage
Check the M+10V line as well
fluctuations along the OVP
as its circuit parts.
line (pin (12) of P1502)?
NO
YES
Check the internal parts of the power
unit (Q703, Q704, Q708, Q709, D717,
D710 and D711).
Are the D_POW and B+2.5V_POW
settings (pins (30), (32), (33) and (34)
of IC1701) at HI?
YES
Are the DC/DC converter output
Chekc the D_POW and
lines and MOS-FET (Q1712,
B+2.5V_POW lines (pins (6)
Q1716, Q1726 and Q1718) as
and (7) of IC1503).
specified?
YES NO
Check the DC/DC converter output
Replace IC1701. lines and replace the MOS-FET
(Q1712, Q1716, Q1726 and Q1718).
Power-on failure (Front LED indicator stays off.)
Is the power cable
connector properly
connected with the set?
Are F701 and F702 intact
in place?
Does the BACK5V line
NO
function?
Check the PS_ON line.
Check the set's wire
harnesses, FFCs and other
parts for their connections.
NO
NO
Reinsert the power cable
connector and turn on the
power again.
YES
Replace F701 or F702 and
turn on the power again. If
NO
the fuse blows out again,
replace VA701, Q701, Q703
and IC702 and check the
performance again.
YES
NO
Check the BACK5V line. Is
there any defective part or
short-circuit?
YES YES
Repair the defective
Check IC701,
part or short-circuit.
T702, PC703 and
Check the
their peripheral
performance again.
circuits.
NO