Toshiba RDXV49DTKF Service Manual page 43

FLOW CHART NO.10
Video E-E does not appear normally.
Are the video signals inputted to each pin of IC1509?
IC1509 20PIN VIDEO-IN 1 (AV1)
IC1509 12PIN VIDEO-IN 2 (AV2)
IC1509 18PIN TUNER-VIDEO
IC1509 3PIN DTV-Y
IC1509 5PIN DTV-C
Are the video signals outputted to Pin(24) of IC1509?
Is the video signal inputted to Pin(48) of IC301?
Is the C-SYNC signal outputted to Pin(67) of IC301?
Is the C-SYNC signal inputted to Pin(58) of IC501?
Yes
Check the line between Pin(67)
of IC301 and Pin(58) of IC501,
and replace P1(AV ASSEMBLY)
if defective.
Is the video signal inputted into Pin(100) of IC1509?
Are the video signals outputted to each pin of IC1509?
IC1509 30PIN VIDEO-OUT 1 (AV1)
IC1509 22PIN VIDEO-OUT 2 (AV2)
Are the video signals outputted to the specific output
terminal?
Are the composite video signals outputted to the
VIDEO-OUT terminal (JK1504)?
Are the composite video signals outputted to the
VIDEO-OUT terminal (JK2001)?
Yes
Yes
Yes
Yes
No
Replace P1(AV
ASSEMBLY).
Yes
Yes
No
Check the line between video input terminal and each
pin of IC1509, and replace P1(AV ASSEMBLY), P6
(BOARD DTV MODULE UNIT) or TU1800 if defective.
IC1509 20PIN
IC1509 12PIN
IC1509 18PIN
IC1509 3PIN
IC1509 5PIN
No
Is 5V voltage supplied to Pin(27,29,47,63) of IC1509?
Is 9V voltage supplied to Pin(75) of IC1509?
Yes
Replace P1(AV
ASSEMBLY).
No
Check the line between Pin(24) of IC1509 and Pin(48)
of IC301, and replace P1(AV ASSEMBLY) if defective.
Is 5V voltage supplied to Pin(18,24,42,55,72,91) of
IC301?
Yes
Yes
Is the serial data and clock signal supplied to Pin(68,69)
of IC301?
Check the line between Pin(68,69) of IC301 and Pin
(71, 72) of IC501, and replace P1(AV ASSEMBLY) if
defective.
No
Check the line between Pin(61) of IC301 and Pin(100)
of IC1509, and replace P1(AV ASSEMBLY) if defective.
No
Is 5V voltage supplied to Pin(27,29,47,63) of IC1509?
Is 9V voltage supplied to Pin(75) of IC1509?
Yes
Replace P1(AV
ASSEMBLY).
No
Check the periphery of JK1504 from Pin(30) of IC1509
and replace P1(AV ASSEMBLY) if defective.
Check the periphery of JK2001 from Pin(22) of IC1509
No
and replace P1(AV ASSEMBLY) if defective.
1-13-16
→
JK1504 VIDEO-IN 1 (AV1)
→
JK2001 VIDEO-IN 2 (AV2)
→
TU1800 17PIN TUNER-VIDEO
→
CN1800 26PIN DTV-Y
→
CN1800 28PIN DTV-C
No
Check the ECO+5V, ECO+9V
line and replace P1(AV
ASSEMBLY) or P4(PW/SW
ASSEMBLY) if defective.
No
No
Check the P-ON+5V line and replace
P1(AV ASSEMBLY) or P4(PW/SW
ASSEMBLY) if defective.
No
No
Check the ECO+5V, ECO+9V
line and replace P1(AV
ASSEMBLY) or P4(PW/SW
ASSEMBLY) if defective.
E3TK0TR