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Re: Mega Drive Blank Screen No Sound
Posted: 04 Sep 2020 13:29
by terriblefire
go0se wrote: 04 Sep 2020 13:25
terriblefire wrote: 04 Sep 2020 12:59
Trying to decide if its worth removing the 68000 and putting the logic analyser on it
Could it be that we have just witnessed the first step towards a Terriblefire Megadrive Accelerator? :lol:
Well i wanted to plug it in for the lolz . :)
Re: Mega Drive Blank Screen No Sound
Posted: 04 Sep 2020 14:35
by Steve
Time for 50mhz 030 Megadrive. Sonic ain't fast enough for Terriblefire!
Re: Mega Drive Blank Screen No Sound
Posted: 04 Sep 2020 15:38
by rubber_jonnie
Somebody needs to try strapping one of the exxos 16Mhz accellerators on....
More seriously, what are /Halt and /Reset doing? And the address/data lines?
Also, you mentioned it was on RF, have you considered trying another video connection, or retuning the TV?
I suppose you aren't getting sound though, also suggesting it is dead.
How about the wandering gangs of dodgy looking electrolytics? Any fishy residue noticeable?
Re: Mega Drive Blank Screen No Sound
Posted: 04 Sep 2020 16:10
by terriblefire
rubber_jonnie wrote: 04 Sep 2020 15:38
Somebody needs to try strapping one of the exxos 16Mhz accellerators on....
More seriously, what are /Halt and /Reset doing? And the address/data lines?
Also, you mentioned it was on RF, have you considered trying another video connection, or retuning the TV?
I suppose you aren't getting sound though, also suggesting it is dead.
How about the wandering gangs of dodgy looking electrolytics? Any fishy residue noticeable?
Nothing nasty looking on the caps. Will check HALT.
Re: Mega Drive Blank Screen No Sound
Posted: 04 Sep 2020 21:20
by terriblefire
Chucked it in the bin. Cant be bothered with it.
Re: Mega Drive Blank Screen No Sound (Binned)
Posted: 04 Sep 2020 22:05
by Tomswork
Have you checked the electrolytic capacitors around the sound chip and motherboard they leak and cause shorts or act kike resistors
Tom
Re: Mega Drive Blank Screen No Sound (Binned)
Posted: 05 Sep 2020 09:18
by terriblefire
Tomswork wrote: 04 Sep 2020 22:05
Have you checked the electrolytic capacitors around the sound chip and motherboard they leak and cause shorts or act kike resistors
Tom
All the caps were fine. The machine is now in landfill. It looked like someone had struggled with this before.
Re: Mega Drive Blank Screen No Sound (Binned)
Posted: 05 Sep 2020 09:30
by PaulJ_2.0
terriblefire wrote: 05 Sep 2020 09:18
It looked like someone had struggled with this before.
A sure sign it's not going to be a smooth run.
I agree with you, they are so cheap that it's best to just buy another than to spend time fixing ones that probably have multiple faults.
Re: Mega Drive Blank Screen No Sound (Binned)
Posted: 05 Sep 2020 10:09
by terriblefire
I'm not seeing these cheap ones ebay that people speak of.
Re: Mega Drive Blank Screen No Sound (Binned)
Posted: 05 Sep 2020 12:11
by PaulJ_2.0
Ebay ones appear less often than they do on Gumtree and FB marketplace.
https://www.facebook.com/marketplace/it ... 4567689790
I'd grab that at it's fairly close to me, check locally to you.