Toshiba rd-xv48dtkb Service Manual page 32

FLOW CHART NO.4
VIDEO E-E does not appear normally.
Are the video signals inputted to each pin of IC1509?
IC1509 18PIN VIDEO-IN 1 (AV1)
IC1509 14PIN VIDEO-IN (FRONT)
IC1509 3PIN DTV-Y
IC1509 5PIN DTV-C
IC1509 12PIN VIDEO-IN 2 (AV2)
IC1509 20PIN TUNER-VIDEO
Are the video signals outputted to each pin of IC1509?
IC1509 61PIN VIDEO-Y/CVBS-IN
IC1509 59PIN VIDEO-C-IN
Are the video signals outputted to each pin of CN1502?
CN1502 20PIN VIDEO-Y/CVBS-IN
CN1502 22PIN VIDEO-C-IN
Continued to A on the next page.
Yes
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.
IC1509 18PIN
IC1509 14PIN
IC1509 3PIN
IC1509 5PIN
IC1509 12PIN
IC1509 20PIN
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 each pin of IC1509 and
each pin of CN1502 and replace P1(AV ASSEMBLY)
if defective.
→ CN1502
IC1509 61PIN
→ CN1502
IC1509
59PIN
1-11-7
→ JK1504
VIDEO-IN 1 (AV1)
→ JK3001
VIDEO-IN (FRONT)
→ CN1800 26PIN
DTV-Y
→ CN1800 28PIN
DTV-C
→ JK2001
VIDEO-IN 2 (AV2)
→ TU1800 17PIN
TUNER-VIDEO
No
Check the ECO+5V, ECO+9V
line and replace P1(AV
ASSEMBLY) or P3(PW/SW
ASSEMBLY) if defective.
20PIN VIDEO-Y/CVBS-IN
22PIN VIDEO-C-IN
E3NG1TR