Sharp DV-HR300U, Service Manual

Page: 18 / 76

18
DV-HR300U
Is video signal output to pins of main unit connector CN3001? CN3001 pin 23 154_Y CN3001 pin 19 154_B/U CN3001 pin 20 154_R/V
FLOW CHART No.7
Playback images do not appear properly (from
Y/C
B
/C
R
output).
NO
Refer to Flow chart No.5 "Playback video signal is not output from main PWB".
YES
NO
Is video signal input to pins of sub unit IC2802 and 2801? IC2802 pin 2 OSD_Y_IN IC2801 pin 1 OSD_PB_IN IC2801 pin 14 OSD_PR_IN
YES
YES
Is 5V applied to IC2802 pin 7? Is 5V applied to IC2801 pin 13?
Is video signal input to pins of IC2802 and 2801? IC2802 pin 8 OSD_Y IC2801 pin 3 OSD_P
B
IC2801 pin 5 OSD_P
R
YES
NO NO NO
Check lines between pins of IC2802 and 2801 and pins of IC2502. IC2802 pin 8
→
IC2502 pin 8 OSD_Y
IC2801 pin 3
→
IC2502 pin 1
1
OSD_P
B
IC2801 pin 5
→
IC2502 pin 16 OSD_P
R
Is video signal input to each pin of IC2502? IC2502 pin 8 OSD_Y IC2502 pin 1
1
OSD_P
B
IC2502 pin 16 OSD_P
R
NO
Check or replace IC2801.
YES YES
Check or replace IC2801.
Check PC_5V (1) line.
Check PC_5V (1) line.
NO
Check circuits and lines between pins of main unit connector CN3001 and input pins of IC2802/2801. CN3001 pin 23
→
S2202 pin 23
→
Q2502, 2504, 2507
→
IC2802 pin 2 OSD_Y_IN CN3001 pin 19
→
S2202 pin 19
→
Q2512, 2515
→
IC2801 pin 1 OSD_ P
B
_IN
CN3001 pin 20
→
S2202 pin 20
→
Q2513, 2516
→
IC2801 pin 14 OSD_ P
R
_IN
Check line between IC2501 pin 20 and component
Y
terminal
(J2403) as well as component terminal (J2403). Check line between IC2501 pin 18 and component C
B
terminal
(J2403) as well as component terminal (J2403). Check line between IC2501 pin 16 and component C
R
terminal
(J2403) as well as component terminal (J2403). Check line between IC2501 pin 20 and DY
terminal (CN2401) as
well as component terminal (CN2401). Check line between IC2501 pin 18 and D C
B
terminal (CN2401)
as well as component terminal (CN2401). Check line between IC2501 pin 16 and D C
R
terminal (CN2401)
as well as component terminal (CN2401).
YES
NO
Is 5V applied to IC2502 pin 13?
Is IC2502 pin 12 PROGRE (H) line at "L" level?
Check PC_5V (1) line.
Is video signal input to each pin of IC2502? IC2502 pin 6 COM_Y IC2502 pin 5 C
B
IC2502 pin 3 C
R
YES
NO NO NO NO NO NO
Is video signal output to each output terminal? Is
Y
signal output to component terminal
(J2403)? Is C
B
signal output to component terminal
(J2403)? Is C
R
signal output to component terminal
(J2403)? Is
Y
signal output to D terminal (CN2401)?
Is C
B
signal output to D terminal (CN2401)?
Is C
R
signal output to D terminal (CN2401)?
NO
YES
Check or replace IC2502.
YES
YES
Check PROGRE (H) line.
NO
Check Q2510 and R2515.
Check T_V_MUTE
line.
NO
NO
Check lines between pins of IC2502 and IC2501. IC2502 pin 6 -> IC2501 pin 10 COM_Y IC2502 pin 5 -> IC2502 pin 12 C
B
IC2502 pin 3 -> IC2502 pin 14 C
R
Is video signal input to each pin of IC2501? IC2501 pin 10 COM_Y IC2502 pin 12 C
B
IC2502 pin 14 C
R
YES
NO
Is 5V applied to IC2501 pins 1 and 28? Is IC2501 pin 13 at "H" level? Check PC_5V (1) line.
Is video signal output to each pin of IC2501? IC2501 pin 20 COMPO_Y IC2501 pin 18 C
B
_OUT
IC2501 pin 16 C
R
_OUT
NO YES
Check or replace IC2501.
YES
Is
T_V_MUTE line at "L" level?
NO
1
1