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20 May 2021, 10:51
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#1 |
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old bearded fool
Join Date: Jan 2010
Location: Bangkok
Age: 56
Posts: 775
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A1200 bad CSYNC signal?
I recently got a CSYNC problem on the A1200, RGB video via SCART sometimes flickers and collapse sideways. I have recapped the A1200 since then but problem persist.
Looks like this on the scope (probes hooked up directly to the video port on the Amiga)...  The "C2:CSYN" (pin 10) horizontal sync pulses within vertical sync pulse looks low to me voltage wise, "C1:VSYN" (pin 11) is vertical sync waveform for reference. Any ideas what could be causing it? I read here you can use composite video out RCA connector (instead of CSYNC) against SCART pin 20 in cable, but haven't tried that yet. Last edited by modrobert; 18 February 2024 at 17:21. |
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20 May 2021, 21:12
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#2 |
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old bearded fool
Join Date: Jan 2010
Location: Bangkok
Age: 56
Posts: 775
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The E253 looks like a suspect on the A1200 schematics, or Alice is bork. Will check the resistor first, might have been close to a leaking capacitor.
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23 July 2021, 17:23
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#3 |
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old bearded fool
Join Date: Jan 2010
Location: Bangkok
Age: 56
Posts: 775
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The E253 resistor (47 Ohm) was open (bad), it was killed by cap leakage, CSYNC signal fine after replacing it.
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