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Old 19 June 2020, 04:27   #1
Pierre
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Join Date: Dec 2018
Location: Melbourne / Australia
Posts: 3
Faulty AmigaKit RGB-to-SCART cable

Hello, I have an Amiga RGB-to-SCART cable that I purchased from AmigaKit but the cable is not working with any SCART TV ports that work with another SCART cable (Sony PS1) that I have tested. I carefully opened up the DSUB and SCART housing to check for faulty connections but fortunately the solder looks intact. I have mapped the DSUB to SCART connections and noted a couple of differences to a reference schematic that I found on this forum:

Amiga 23-pin DSUB --------------- SCART connector
Pin 3 (Red video) --------------- Pin 15 (Red video)
Pin 4 (Green video) ------------- Pin 11 (Green video)
Pin 5 (Blue video) -------------- Pin 7 (Blue video)
Pin 11 (Horizontal Sync)**------- Pin 20 (Composite video)
Pin 16 (Video GND) -------------- Pin 5 (Video GND)
Pin 17 (Video GND) -------------- Pin 9 (Video GND)
Pin 18 (Video GND) connected to RCA Audio GND for both left and right channels
Pin 19 (Composite Video GND) ---- Pin 4 (Audio GND)
Pin 20 (Video GND) -------------- Pin 13 (Video GND)
Pin 22 (+12V) ------------------- Pin 8 (SWITCH)
Pin 23 (+5V) -------------------- Pin 16 (RGB Mode)

Differences to reference schematic:
  • DSUB Pin 10 (Composite Sync) not connected to SCART Pin 20 (Composite video) **Could this be the main problem?
  • DSUB Pin 19 (Composite Video GND) not connected to SCART Pin 17 (Composite Video GND)
  • DSUB Pin 18 (Video GND) connected to RCA Audio GND for both left and right
  • SCART Pin 4 (Audio GND) connected to DSUB Pin 19 (Composite Video GND) rather than RCA Audio GND
Any suggestions are welcomed.

Thank you
Pierre
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