Question about Double Dragon Jamma Board..............

[dsquared2]

I just bought Double Dragon Jamma Board from Japan but the characters are invisible when I play it on my Samsung LED TV with XRGB-3 converter. I would like to ask that it is setting problem or anything else? I tried to set resolution on 320 which is no graphic and set to 640 , the result like the picture above.

[Fudoh]

That's a deinterlacing problem (assuming it's not a ROM defect on the PCB). Shouldn't be happening with the XRGB in B1 mode. Technically it's even impossible to happen in B1, so I assume you're running B0 ?

[dsquared2]

That's a deinterlacing problem (assuming it's not a ROM defect on the PCB). Shouldn't be happening with the XRGB in B1 mode. Technically it's even impossible to happen in B1, so I assume you're running B0 ?

Yes, I'm running B0 and set VL_V and VL_H at 255. so that if I set to B1 mode, it may fix the problem?

[RGB32E]

I just bought Double Dragon Jamma Board from Japan but the characters are invisible when I play it on my Samsung LED TV with XRGB-3 converter. I would like to ask that it is setting problem or anything else? I tried to set resolution on 320 which is no graphic and set to 640 , the result like the picture above.

Looks like an issue with your Double Dragon PCB. More than likely a bad connection with one or more of the ROMs on the board. One of my Strider PCBs has this type of issue (but "fixes" itself after being on for >15min). I've played my DD PCB on my XRGB-3 in B0 and B1 and have not encountered any issues. DD outputs 240p, so the XRGB-3 wouldn't try to deinterlace it as Fudoh suggested (or else the whole image would be affected, not just the sprites).

[system11]

Sprite RAM (or related component) fault. Only occasionally a ROM fault when you see this. Tap the joystick very carefully so the character moves 1 pixel up. Do the jailbars move 1 pixel up too? If so it's possibly ROM, if not it's 90% chance of RAM fault or related graphics chips.

You might get lucky - try reseating the ribbon cables.

[dsquared2]

I just bought Double Dragon Jamma Board from Japan but the characters are invisible when I play it on my Samsung LED TV with XRGB-3 converter. I would like to ask that it is setting problem or anything else? I tried to set resolution on 320 which is no graphic and set to 640 , the result like the picture above.

Looks like an issue with your Double Dragon PCB. More than likely a bad connection with one or more of the ROMs on the board. One of my Strider PCBs has this type of issue (but "fixes" itself after being on for >15min). I've played my DD PCB on my XRGB-3 in B0 and B1 and have not encountered any issues. DD outputs 240p, so the XRGB-3 wouldn't try to deinterlace it as Fudoh suggested (or else the whole image would be affected, not just the sprites).

I used Analog output. Yes, it should be whole image would be affected but in my case, only the Characters are affected. It is so strange. Also, I played other Jamma board, it is no problem but I'm playing "Slam Dunk 2" Jamma boards for only half and hour, it was blown my step down converter for my Supergun and then I used other Step down Converter, it was blown again. It is crazy.

[dsquared2]

Sprite RAM (or related component) fault. Only occasionally a ROM fault when you see this. Tap the joystick very carefully so the character moves 1 pixel up. Do the jailbars move 1 pixel up too? If so it's possibly ROM, if not it's 90% chance of RAM fault or related graphics chips.

You might get lucky - try reseating the ribbon cables.

Thank you for your replying. I cannot try it at this moment because I played my other game "Slam Dunk 2" for only half and hour, it was blown my step down converter for my Supergun and I used my other Step down Converter, it was blown again for this game. I need to buy other Step down converter. Thanks.

[dsquared2]

all characters is still invisible when I'm moving the character forward.

[system11]

all characters is still invisible when I'm moving the character forward.

They're not invisible - the photo shows every alternate line is missing - these are called jailbars in the arcade world. I'll try to make a video next time I repair a PCB which shows exactly what I mean by ROM vs RAM faults.

It looks like your Double Dragon PCB is faulty though, you should return it for a refund.

[dsquared2]

Yes, this board should be effective Item but the seller said it does work on description and he said no refund and no return. Fortunately, this board is not expensive. Anyway, thank you for your helping.

[system11]

Yes, this board should be effective Item but the seller said it does work on description and he said no refund and no return. Fortunately, this board is not expensive. Anyway, thank you for your helping.

If you want to sell it (and if it is an original) I might be interested - I can probably fix that.

[PC Engine Fan X!]

I've got an original USA region Double Dragon PCB...is 100% working considering it's a two PCB layer affair. On the early Jamma-based multi-layered PCBs using looms, sometimes, by reinserting the ribbon cables, most minor graphical glitches would go away.

Bought a USA region Alcon PCB with minor graphical corruption issues, by re-seating both Oki manufactured ribbon cables, & rebooting it up, it was back to working 100% again. Easy as pie.

PC Engine Fan X! ^_~

[Mikey]

I have this problem with OutZone.



The same lines in the characters seem to be missing when I walk him across the screen.

Not all sprites are affected. For example, the 'E' energy icons have lines through them, but all other icons for weapons etc. are fine. Some enemy sprites are unaffected.

The board has a repair underneath where a scratch went through a trace. The repair seems fine.

There are other light scratches around the underside, but none of the traces lack continuity as far as I can tell. I've tested as many as I could see.

I'd like to get this board fixed, and I'd appreciate any advice on where to look for problems, or how to test. I had planned to reinsert ROMs as a first test, then remove one ROM at a time if that didn't work.

[system11]

Could be a lot of things, dead ROM, a track you haven't checked (really you need a logic probe for this), or faults higher up the chain - or sprite RAM again.

Removing ROMs one at a time would actually identify the problem if it's ROM / communication with ROM related. Graphics are ROMs 1-6 on that PCB.

[IronGiant]

As system11 says, quite possibly it's a sprite RAM fault (in both cases).

Could well be other things, but sprite RAM (or something else in that circuit) will be the cause of the fault.

[Mikey]

Thanks. I'll do some more checks when I get the chance, first with ROMs.

One odd feature: The player bullet sprites are unaffected when shooting forward, but shoot backward and they have lines.