Ask general Genesis/MD/Sega CD/32X questions here (for new members)

[Silanda]

I think VGA automatically uses 60hz, skipping the 50/60hz prompt if a game has it.
Most likely the NTSC dreamcast composite/s-video encoder doesn't support PAL, and will display messed up colors in 50hz. (other consoles like gamecube have similar issues)

But consider this speculation. I don't own PAL dreamcast games.

I agree on both counts. If the game supports VGA it will output at 60Hz, even if it's a PAL game. The box doesn't claim VGA compatibility though, so that may be why there's an issue.

A SCART cable might work, but AFAIK the PAL version of that game is 50Hz only, so it's possible it will misbehave on a Japanese console.

[lumclaw]

SCART is a good idea. A few games can't use VGA properly at all.

I don't know what other PAL differences the game has. NTSC copies are affordable enough, if necessary.

[xoddf2]

In early 2017, I obtained a VA6 model 1 and an MK-1602 AC adapter. It did not work. Even when connected to an outlet for a while, it does not even get warm.

Several months later, I obtained a 1602-1 AC adapter. This one does get warm when connected for a while, but it does not work either.

What could be wrong with them?

[pyroesp]

In early 2017, I obtained a VA6 model 1 and an MK-1602 AC adapter. It did not work. Even when connected to an outlet for a while, it does not even get warm.

Several months later, I obtained a 1602-1 AC adapter. This one does get warm when connected for a while, but it does not work either.

What could be wrong with them?

Why do you assume it's the AC adapters that are faulty? Have you tried measuring the output of both power supplies with a voltmeter ?
The fact that one is getting warm means that it's doing something, might not be outputting a voltage, but it's doing something.

If the AC adapters work then my suggestion would be to test both 78XX voltage regulators out of circuit.
Test for shorts to ground while the voltage regs aren't on the motherboard. If you have a short, find it and fix it.
If both voltage regs work, then place them back and apply power. Measure voltage from the jack input to the input of the 78XX. If it stops halfway through, then you have an issue with one of the component.

Repairing an AC adapter isn't really worth it IMO. The thing is ultrasonically welded shut.

[xoddf2]

Why do you assume it's the AC adapters that are faulty? Have you tried measuring the output of both power supplies with a voltmeter ?

I tried them with an NES, and they didn't work there either.

(No, I did not try the opposite, for obvious reasons.)

[pyroesp]

If you still want to open them up, there's probably only a transformer, a half or full bridge rectifier and a smoothing cap in there.
The problem is the ultrasonic welding.
It's not something you can just pop open, at least that's what I've seen so far. I don't own one of those you mentioned, so who knows.

The NES adapter is 9VAC right?


Do you know if the VA6 model you have works? Have you tried with a different ac adapter?

[xoddf2]

Yes, the NES-002 wall wart outputs AC 9V 1.2A. I didn't want to fry the MD1 with it.

Those official Sega MK-1602 and 1602-1 wall warts were the only 2 I could find around here compatible with it, therefore I don't know if it works.

[chessage]

The problem is the ultrasonic welding.
It's not something you can just pop open, at least that's what I've seen so far. I don't own one of those you mentioned, so who knows.

Every MK-1602 series adapter I've owned was held together with safety screws. Very serviceable.

[pyroesp]

If it's only held by screws then xoddf2 can open them up and post a few pictures maybe.

Obviously safety is priority. If you want to troubleshoot whilst it's plugged in. Be careful of mains voltage.

[xoddf2]

I just tested both AC adapters with a multimeter, and they were both dead.

[pyroesp]

xoddf2, if the ac adapters are held with screws, it might be worthwhile to open them up and check the inside. They are original adapters after all.

[infidelity]

Thank you for replying! I'll check out that location and sever it carefully so I can resolder the cut incase this doesn't give me the result I want.

[xoddf2]

In early 2017, I obtained a VA6 model 1 and an MK-1602 AC adapter. It did not work. Even when connected to an outlet for a while, it does not even get warm.

Several months later, I obtained a 1602-1 AC adapter. This one does get warm when connected for a while, but it does not work either.

What could be wrong with them?

I just obtained a 3rd MK-1602, and it worked fine. The VA6 Genesis 1 is in full working order.

[xoddf2]

I recently obtained a copy of OutRun, and it refuses to boot. I even cleaned it repeatedly. My model 1 displays the TMSS screen, followed by nothing. My model 2s don't get even that far. What could be wrong with it?

[EyeDeeNo76]

I recently obtained a copy of OutRun, and it refuses to boot. I even cleaned it repeatedly. My model 1 displays the TMSS screen, followed by nothing. My model 2s don't get even that far. What could be wrong with it?

Could be the board's capacitor has gone bad?