A1200 RGB out broken

roondar · 11 February 2020, 22:22

So today I did something monumentally stupid and plugged in the RGB video cable while my A1200 & monitor were both on. I normally never do this, but I had forgotten to plug it in and well... I wanted to try something out quickly and it happened.

Anyway, to make a long story short:

Composite video out on my A1200 still works fine
The RGB cable still works fine on my A600
But the RGB output of my A1200 doesn't work any more

Does anyone here know what the most likely broken components are in this scenario?

Thanks a lot for any assistance!

Daedalus · 11 February 2020, 22:34

To be honest, probably not a lot is broken. Does your display need the RGB select voltage to put it in RGB mode (often the case with SCART)? If so, it's possible you've shorted out the 5V or 12V line against ground, resulting in a burned trace or ferrite bead on that line. If you damaged the actual red, green or blue signals, composite wouldn't work either.

roondar · 11 February 2020, 22:41

I'm not sure it needs that, it's connected to a Philips CM8833. Don't have the manual of that one at the ready as it's a 2nd hand one. Let me see if I can find something on Google.

roondar · 11 February 2020, 22:45

Managed to find the manual. It has an RGB status voltage switch, pressing that restores the image so it seems your suggestion is indeed correct. Thanks for the help, I now know what needs to be fixed!

11 February 2020, 22:22	#1
roondar Registered User Join Date: Jul 2015 Location: The Netherlands Posts: 3,411	A1200 RGB out broken So today I did something monumentally stupid and plugged in the RGB video cable while my A1200 & monitor were both on. I normally never do this, but I had forgotten to plug it in and well... I wanted to try something out quickly and it happened. Anyway, to make a long story short: Composite video out on my A1200 still works fine The RGB cable still works fine on my A600 But the RGB output of my A1200 doesn't work any more Does anyone here know what the most likely broken components are in this scenario? Thanks a lot for any assistance!

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11 February 2020, 22:34	#2
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,335	To be honest, probably not a lot is broken. Does your display need the RGB select voltage to put it in RGB mode (often the case with SCART)? If so, it's possible you've shorted out the 5V or 12V line against ground, resulting in a burned trace or ferrite bead on that line. If you damaged the actual red, green or blue signals, composite wouldn't work either.

11 February 2020, 22:41	#3
roondar Registered User Join Date: Jul 2015 Location: The Netherlands Posts: 3,411	I'm not sure it needs that, it's connected to a Philips CM8833. Don't have the manual of that one at the ready as it's a 2nd hand one. Let me see if I can find something on Google.

11 February 2020, 22:45	#4
roondar Registered User Join Date: Jul 2015 Location: The Netherlands Posts: 3,411	Managed to find the manual. It has an RGB status voltage switch, pressing that restores the image so it seems your suggestion is indeed correct. Thanks for the help, I now know what needs to be fixed!

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