Service manual
17
DV-HR300U
Y/C/C
B
/C
R
output
Is video signal output to each pin of IC7506?
IC7506 pin 218 (R7742) Y OUT (Q7506 pin 5 B)
IC7506 pin 214 (R7744) C OUT (Q7505 pin 5 B)
IC7506 pin 245 (R7724) C
B
(B_U) OUT (Q7503 B)
IC7506 pin 224 (R7737) C
R
(R_V) OUT (Q7502 B)
FLOW CHART No.5
Playback video signal is not output from main PWB.
Is drive control of IC7506 working properly?
Is HDD control working properly?
YES
Check lines between pins of IC7506 and CN3001 as well as
circuits on lines.
IC7506 pin 218 (R7742) → Q7506 → Q7509 (FL7501 →
Q7508 in LP mode) → IC7512 → CN3001 pin 23 154_Y
IC7506 pin 214 pin (R7744) → Q7505 → CN3001 pin 25 154_C
IC7506 pin 245 pin (R7724) → Q7503 → CN3001 pin 19 154_B/U
IC7506 pin 224 pin (R7737) → Q7502 → CN3001 pin 20 154_R/V
NO
NO
Refer to Flow chart No.2 "Drive is not working
properly (communication failure with IC7506)"
or Flow chart No.3 "HDD is not working
properly (communication failure with IC7506)".
Check IC7506 and peripheral circuits.
YES
Y/P
B
/P
R
output (progressive mode)
Is video signal output to each pin of IC7506?
IC7506 pin 223 (R7738) Y (G_Y) OUT (Q7501 B)
IC7506 pin 245 (R7724) P
B
(B_U) OUT (Q7503 B)
IC7506 pin 224 (R7737) P
R
(R_V) OUT (Q7502 B)
NO
YES
Check IC7506 and peripheral circuits.
Check lines between pins of IC7506 and CN3001 as well as
circuits on lines.
IC7506 pin 223 pin (R7738) → Q7501 → CN3001 pin 18 154_G/Y
IC7506 pin 245 pin (R7724) → Q7503 → CN3001 pin 19 154_B/U
IC7506 pin 224 pin (R7737) → Q7502 → CN3001 pin 20 154_R/V
Is video signal output to pins of main unit connector CN3001?
CN3001 pin 23 154_Y
CN3001 pin 25 157_C
FLOW CHART No.6
Playback images do not appear properly (from video/S output).
NO
Refer to Flow chart No.5 "Playback video
signal is not output from main PWB".
Check circuits and lines between pins of
main unit connector CN3001 and input pins
of IC2802.
CN3001 pin 23 → S2202 pin 23 → Q2502,
2504, 2507 → IC2802 pin 2 OSD_Y_IN
CN3001 pin 25 → S2202 pin 25 → Q2501,
2503, 2506 → IC2802 pin 4 OSD_C_IN
YES
NO
Check lines between IC2501 pin 21 and
S-OUT 1/2 Y terminals (J2402) as well as
S-OUT 1/2 terminals (J2402).
Check lines between IC2501 pin 26 and
S-OUT 1/2 C terminals (J2402) as well as
S-OUT 1/2 terminals (J2402).
Check lines between IC2501 pin 23 and
VIDEO OUT 1/2 terminals (J2402) as well as
VIDEO OUT 1/2 terminals (J2402).
Is video signal input to each pin of sub unit IC2802?
IC2802 pin 2 OSD_Y_IN
IC2802 pin 4 OSD_C_IN
YES
NO
Is 5V applied to IC2501 pins 1, and 28?
Is 5V applied to IC2802 pin 7?
Is IC2501 pin 3 at "H" level?
Check PC_5V (1) line
Check PC_5V (1)
line.
NO
NO
Is video signal output to each pin of IC2802?
IC2802 pin 8 OSD_Y
IC2802 pin 6 OSD_C
YES
Is video signal input to each pin of IC2501?
IC2501 pin 6 OSD_Y
IC2501 pin 2 OSD_C
YES
Is video signal output to each pin of IC2501?
IC2501 pin 21 Y_OUT
IC2501 pin 26 C_OUT
IC2501 pin 23 V_OUT
Check lines between pins of IC2802 and
IC2501.
IC2802 pin 8 → IC2501 pin 6 OSD_Y
IC2802 pin 6 → IC2501 pin 2 OSD_C
YES
NO
NO
NO
Is video signal output to each output terminal?
SIs Y signal output to S-OUT 1/2 terminals (J2402)?
Is C signal output to S-OUT 1/2 terminals (J2402)?
Is CVBS signal output to VIDEO OUT 1/2 terminals (J2402)?
NO
YES
ICheck or replace
IC2501.
YES
Check or replace
IC2801.
YES
YES
Is T_V_MUTE line
at "L" level?
NO
NO
Check Q2510 and
R2515.
Check T_V_MUTE
line.
NO