Toshiba D-VR50KF Service Manual page 24

FLOW CHART NO.11
DVD-P-ON+3.3V is not outputted.
Is 5V voltage supplied to Pin(1) of IC1505?
Replace IC1505.
FLOW CHART NO.12
DVD-P-ON+12V is not outputted.
Is 12V voltage supplied to the emitter of Q1511?
Is the "L" pulse outputted to the collector of
Q1514?
Replace Q1511.
FLOW CHART NO.13
DVD-P-ON+5V is not outputted. (AL+5V is outputted normally.)
Is the "H" pulse inputted to the base of Q1510?
Replace Q1510.
FLOW CHART NO.14
The fluorescent display tube does not light up.
Is 5V voltage supplied to Pin(13, 43) of IC612?
Is approximately -24V to -28V voltage supplied to
Pin(30) of IC612?
Is there approximately 500kHz oscillation to
Pin(5) of IC612?
Are the filament voltage applied between Pin(1)
and Pin(24) of the fluorescent display tube?
Also negative voltage applied between these pins
and GND?
Replace the fluorescent display tube (FL601).
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Check D015, D016, D1032, L013, C018 and their
periphery, and service it if defective.
No
Check D1031, L1013, C1037, C1039 and their
periphery, and service it if defective.
No
Check Q1514 and PWR-SW line, and service it if
defective.
No
Check R1531, R1532 and their periphery, and
service it if defective.
No
Check the EV+5V line and service it if defective.
No
Check the -FL line and service it if defective.
No
Check R618, IC612 and their periphery, and
service it if defective.
No Check the power circuit, D1016, D1017,
R1040, R1041, C1018 and their periphery, and
service it if defective.
1-10-3 E9GA0TR