Toshiba DVR80KF Service Manual page 28

FLOW CHART NO.19
P-ON+1.8V is not outputted.
Is 2.5V voltage supplied to pin(1) of IC1103?
Is the "H" pulse (approximately 5V) inputted to
the base of Q1109?
Check IC1103 and their periohery, and replace
P1(AV ASSEMBLY) if defective.
FLOW CHART NO.20
USB+5V is not outputted.
Is resistance value of both end to F6001 infinity?
Is 5V voltage supplied to Pin(4) of CN6001?
When IC3607 is used:
Is 5V voltage outputted to Pin(8) of IC3607?
When IC3608 is used:
Is 5V voltage outputted to Pin(5) of IC3608?
Is 0V voltage outputted to Pin(1) of CN3605?
When IC3607 is used:
Is 3.3V voltage supplied to Pin(4) of IC3607?
When IC3608 is used:
Is 3.3V voltage supplied to Pin(3) of IC3608?
Check IC3607(IC3608) and their periphery, and
replace P4(PW/SW ASSEMBLY) if defective.
FLOW CHART NO.21
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 P1(AV ASSEMBLY).
Yes
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
No
Check D1033 and their periohery, and replace
P4(PW/SW ASSEMBLY) if defective.
No
Check the REG-CONT signal line, and replace
P1(AV ASSEMBLY) if defective.
Yes
Replace P4(PW/SW ASSEMBLY) if defective.
Yes
Replace P4(PW/SW ASSEMBLY) if defective.
Check CN3604 and their periphery, and replace
Yes
P4(PW/SW ASSEMBLY) if defective.
Yes
Check Q1119 and their periphery, and replace
P4(PW/SW ASSEMBLY) if defective.
Yes Replace P2(DVD MECHANISM & DVD MAIN
BOARD ASSEMBLY).
No
Check the ECO+5V line and replace
P1(AV ASSEMBLY) if defective.
No
Check the -FL line and replace P1(AV ASSEMBLY)
or P4(PW/SW ASSEMBLY) if defective.
No
Check R618, IC612 and their periphery, and replace
P1(AV ASSEMBLY) if defective.
No Check the power circuit, D1103, D1108, R1106, R1192,
C1110 and their periphery, and replace
P4(PW/SW ASSEMBLY) if defective.
1-11-5 E9TK3TR