Mitsubishi Electric LC62 CHASSIS XL6500LU Service Manual page 7

Power source system 1
The projector does not
enter the stand-by mode.
Has the FUSE
(F9F1) blown?
INLET PCB ASSY
NO
Is the PP,PF-RF
or RD-SD connectors
inserted properly?
YES
Is the lead wire
PB-RB or RD-SD
broken?
NO
Is the pin No. 3
of the SD
connector 5 V?
MAIN PCB ASSY
YES
Malfunction of the MAIN PCB ASSY
or KEY PCB ASSY.
The terminal shield
secondary side are checked.
(Do not use a heat dissipation board as GND.)
LED doesn't illuminate.
Check the STBY5.
Check for any failure on the POWER PCB ASSY,
then replace the parts.
YES
(Check especially D900, Q900, Q901, Q902,
Q905, IC9M0 and IC900.)
Insert the connectors properly.
NO
YES
Replace the lead wire.
Remove the
SD connector
NO
from the MAIN
PCB ASSY.
Malfunction of the PREAMP PCB ASSY or the KEY PCB ASSY.
can be used as GND when the terminal voltages and the waveforms on the
Is the pin No. 3 NO
of the RD
connector 5 V?
POWER PCB ASSY
YES
Replace the
YES
MAIN PCB ASSY and
check if the product enters
the stand-by
mode.
NO
- 2 -
Check the circuits around IC950,
IC951, and PC950, and replace them,
if necessary. (Especially check Z952. )
Malfunction of the MAIN PCB ASSY.