Loewe 67501 D 00, Service Manual

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67501 T/D 00
2 – 3
No video signal output from the main PWB
Is video signal input into each terminal of SC5601?
1) S-VIDEO and COMPOSIT OUTPUT TERMINALS
2 pins (SUB_YOUT), 4 pins (SUB_COUT)
2) D-VIDEO TERMINAL
6 pins (MAIN_YOUT), 8 pins (MAIN_PBOUT), 10 pins (MAIN_PROUT)
Is video signal detected at R5614 (Y) and R5615 (C)?
Check SC5601.
Check the peripheral circuits of each transistor.
Also, check SUB_PC_5V line.
1) S-VIDEO and COMPOSIT OUTPUT TERMINALS
Q5604, Q5605
2) D-VIDEO TERMINAL
Q5601, Q5602, Q5603
YES
YES
Is video signal input into the base of transistor for each buffer?
NO
NO
Check R5614, R5615 and their peripheral
circuits.
YES NO
FLOW CHART No.3
D-VIDEO TERMINAL S-VIDEO TERMINAL
COMPOSIT TERMINAL
A
A
B
Is video signal detected at R5611 (Y), R5612 (PB) and R5613 (PR)?
PWB change.
Check R5611, R5612, R5613 and their
peripheral circuits.
YES NO
B