Toshiba rd-xv48dtkb Service Manual page 30

FLOW CHART NO.18
P-ON+3.3V is not outputted.
Is the supply voltage 5V fed to the cathode of D1101?
Is the "H" pulse (approximately 5V) inputted to
the base of Q1107?
Is 3.3V voltage outputted to pin 2 of IC1104?
Check for load circuit short-circuiting or leak, and
replace P1(AV ASSEMBLY) if defective.
FLOW CHART NO.19
SYS+5V is not outputted.
Is 5V voltage outputted to pin 26 of CL1001?
Check for load circuit short-circuiting or leak, and
replace P1(AV ASSEMBLY) if defective.
FLOW CHART NO.20
P-ON+1.8V is not outputted.
Is 2.5V voltage supplied to pin(1) of IC1800?
Check IC1800 and their periohery, and replace
P1(AV 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
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Check D1101 and their periphery, and replace
P3(PW/SW ASSEMBLY) if defective.
No
Check the 1V2CONT signal line, and replace
P1(AV ASSEMBLY) if defective.
No
Check IC1104 and their periphery, and replace
P3(PW/SW ASSEMBLY) if defective.
No
Check IC1105 and their periohery, and replace
P3(PW/SW ASSEMBLY) if defective.
No
Check D1033 and their periohery, and replace
P3(PW/SW ASSEMBLY) if defective.
No
Check the ECO+5V line and replace
P1(AV ASSEMBLY) if defective.
No
Check the -FL line and replace P1(AV ASSEMBLY)
or P3(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, C1110
and their periphery, and replace P3(PW/SW ASSEMBLY)
if defective.
1-11-5 E3NG1TR