Mega Drive Blank Screen No Sound (Binned)

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terriblefire
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Mega Drive Blank Screen No Sound (Binned)

Post by terriblefire » Fri Sep 04, 2020 10:00 am

Hey,

I got my son a MegaDrive to play with but i cant get it to power up. I've given it 10V center negative and it draws about 0.7A. The lights come on and there is a 7MHz clock at the 68000. But no sound output and no screen. There is 5v on the board too.

Ideas of what to check? i have Sonic the hedgehog cart in.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Steve
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Re: Mega Drive Blank Screen No Sound

Post by Steve » Fri Sep 04, 2020 10:55 am

There are three models of Megadrive and they all have different motherboards. They have a sony chip that encodes the RGB and audio. But to be honest these things are tanks and usually it is something simple. I would just clean the cartridge contacts with IPA and check the connector doesn't have dry solder joints. I assume you're using SCART, make sure you use a Megadrive compatible one.
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terriblefire
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Re: Mega Drive Blank Screen No Sound

Post by terriblefire » Fri Sep 04, 2020 11:38 am

Actually on RF right now and have headphones in the socket.. i'll post some photos.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Re: Mega Drive Blank Screen No Sound

Post by terriblefire » Fri Sep 04, 2020 11:56 am

Photos - Got no idea..

Both regulators give me 5.00v
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———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

cmorley
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Re: Mega Drive Blank Screen No Sound

Post by cmorley » Fri Sep 04, 2020 12:29 pm

Clean the cartridge edge connector on the motherboard and the cartridge. Bad connection to the ROM & you get nothing. I often get this when I insert my megaeverdrive for the first time in ages. As an extension, check the cart soldering for cracked joints.

Have you tried another game in case the cart is dead?

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Re: Mega Drive Blank Screen No Sound

Post by Steve » Fri Sep 04, 2020 12:55 pm

cmorley wrote:
Fri Sep 04, 2020 12:29 pm
Clean the cartridge edge connector on the motherboard and the cartridge. Bad connection to the ROM & you get nothing. I often get this when I insert my megaeverdrive for the first time in ages. As an extension, check the cart soldering for cracked joints.

Have you tried another game in case the cart is dead?
Yeah try cleaning the cart and edge connector, and check for dry joins. Dunno why I didn't think of that :lol:
Repairs & Servicing for Atari & Amiga machines (and any other retro computers) Located in the West Midlands UK. PM me if you require assistance.
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Re: Mega Drive Blank Screen No Sound

Post by terriblefire » Fri Sep 04, 2020 12:59 pm

Tried all of the above. It looks like someone has been at this board already. There were tiny solder balls lodged between the TQFP package pins. but that hasnt helped :/ Trying to decide if its worth removing the 68000 and putting the logic analyser on it
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Re: Mega Drive Blank Screen No Sound

Post by cmorley » Fri Sep 04, 2020 1:12 pm

terriblefire wrote:
Fri Sep 04, 2020 12:59 pm
Trying to decide if its worth removing the 68000 and putting the logic analyser on it
Sub £30 on eBay for a working one with a game or two and 2 controllers... or £10 for just the console.

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Re: Mega Drive Blank Screen No Sound

Post by terriblefire » Fri Sep 04, 2020 1:19 pm

cmorley wrote:
Fri Sep 04, 2020 1:12 pm
terriblefire wrote:
Fri Sep 04, 2020 12:59 pm
Trying to decide if its worth removing the 68000 and putting the logic analyser on it
Sub £30 on eBay for a working one with a game or two and 2 controllers... or £10 for just the console.
Thats what i did and this is what i got.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Re: Mega Drive Blank Screen No Sound

Post by go0se » Fri Sep 04, 2020 1:25 pm

terriblefire wrote:
Fri Sep 04, 2020 12:59 pm
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:

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