Hi all!!! I've got two consoles Sega Mega drive broken... One (MD1 VA6) turns on but nothing apears on screen, only a flash when I turn it on and a little buzz on sound (that stops in 1 second). This appeared after trying to overclock the 68k (which is an Hitachi), and I don't know what may cause it. I've undo all the conections but problem remains...
The another one is an MD2 VA1 (thank God compatible with TmEE's CCAM)which doesn't turn on
... The heatsync heats but the console doesn't turns on. The connector was fully with corrosion and around him too. I've cleaned all corrosion but the led doesn't turns on (I didn't put any cartdrige because when the led doesn't light on there´s problems).
Someone knows how to solve this kind of problems?
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Thread: Sega Hardware Repair
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08-25-2008, 06:02 PM #1Contra HC super fan! Wildside Expert
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Sega Hardware Repair
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08-25-2008, 06:25 PM #2Creator of the Mega Amp Raging in the Streets
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It could well be that your VA1 MegaDrive 2's LED doesn't work. If the heatsink gets hot when you press the power button, electricity is flowing through the unit. Before considering it "dead", I'd plug in a cartridge first. Maybe it's just the LED that needs to be replaced.
As for your VA6 MegaDrive 1, it could be that the processor's dead. Did you disconnect the old 7.6MHz line on the board before overclocking it? If you didn't, chances are your Hitachi 68000 is dead. Or maybe you used an oscillator that has too high a frequency? What was the value of the oscillator? If that's not the problem, the cartridge slot may be loose or the pins are not making a contact with the cartridge.HATES ATGAMES WITH A PASSION
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08-25-2008, 06:47 PM #3Contra HC super fan! Wildside Expert
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Yeah. I think it's the processor because after few minutes turned on, its nucleo starts to overheat, almost burning!!! I'm gona check MD2 led.
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08-25-2008, 07:13 PM #4Creator of the Mega Amp Raging in the Streets
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Replace your 68000 ASAP. And use a Motorola one, those ones are a lot more stable for overclocking.
HATES ATGAMES WITH A PASSION
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08-25-2008, 07:36 PM #5Contra HC super fan! Wildside Expert
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I can't, I don't have a spare 68000...
And I don't know where to get it without screwing a console 
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08-25-2008, 07:41 PM #6Creator of the Mega Amp Raging in the Streets
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Do you buy things off of eBay? If so, look here: http://cgi.ebay.com/MC68000L8-68000-...QQcmdZViewItem
This one can operate between 4 and 8MHz. You can always look around eBay, there are several Motorola 68000s for sale.HATES ATGAMES WITH A PASSION
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08-25-2008, 07:48 PM #7Contra HC super fan! Wildside Expert
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Yes. This one is too expensive but I'm gona search other ones.
Originally Posted by Ace
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08-25-2008, 07:56 PM #8Creator of the Mega Amp Raging in the Streets
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I did find one for cheaper, but it comes from China(I usually don't trust Chinese sellers). Maybe you do?
HATES ATGAMES WITH A PASSION
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08-25-2008, 07:59 PM #9Contra HC super fan! Wildside Expert
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Sometimes, for me it's always according to the seller feedback and "feeling" of trust...
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08-26-2008, 09:53 AM #10Mastering your Systems Shining Hero
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For MD2, seems like the 7805 (the chip on the heatsink) might still be dead, even though it warms up... take a tester and see if there's 5V on the 3rd pin of the chip.
Death To MP3, 
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09-03-2008, 09:06 AM #11Contra HC super fan! Wildside Expert
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The MD2 led is broken
But although this, the games refuses to boot. I'm gona check the cart connector.
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09-03-2008, 09:24 AM #12Mastering your Systems Shining Hero
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dead LED and bad 7805 means nothing good.... there's a great chance the whole thing is dead
Death To MP3, :3
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09-03-2008, 09:56 AM #13Master of Shinobi
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Change the IC power regulator (7805) just to see if there is any improvement...
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09-07-2008, 08:35 PM #14Contra HC super fan! Wildside Expert
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I think the 7805 works well because my Mega Cd works fine with that md2 and when I turn the console on the "PRODUCED BY OR UNDER LICENSE FROM SEGA ..." screen apears, but then nothing more when the cartdrige is introduced... I think it have a loose cart connector.
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09-07-2008, 09:08 PM #15Mastering your Systems Shining Hero
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yup, bad cart connector... I have a fix for that, well, no me :P
http://www.mmmonkey.co.uk/console/se...loose-cart.htm
http://www.mmmonkey.co.uk/console/se...loose-cart.htm
Just don't push too hard, otherwise you will have the rows touch each other which means no MCD unless you put some paper in the cartslot
Death To MP3, :3
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