English Amiga Board - View Single Post - A600

supaduper · 03 April 2017, 16:59

I had the same problem with a A600 recently ,there was no Red so I pulled out my cheapo logic probe and went around the components checking for the RGB signals and I found it within a few minutes ,mine was the Q231 transistor it was bad, changed it with one from a donor A600 and its all working again.

The good thing with a logic probe is you could see if the CXA1145M is outputing the RGB signals like Zetro said and go from there.
I would swap out the Q233 and try it anyway as it seems these SOTS are prone to go bad.

03 April 2017, 16:59	#10
supaduper Registered User Join Date: Oct 2012 Location: Krypton Posts: 1,214	I had the same problem with a A600 recently ,there was no Red so I pulled out my cheapo logic probe and went around the components checking for the RGB signals and I found it within a few minutes ,mine was the Q231 transistor it was bad, changed it with one from a donor A600 and its all working again. The good thing with a logic probe is you could see if the CXA1145M is outputing the RGB signals like Zetro said and go from there. I would swap out the Q233 and try it anyway as it seems these SOTS are prone to go bad.