Large problem, MSX computer not displaying anything

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By Adam

Rookie (18)

Аватар пользователя Adam

04-10-2009, 21:02

I finished transplanting my computer into an xbox case. I wired up all the ports correctly, I am very sure there are no short circuits or anything. My computer is a phillips nms 8250. No matter what display mode I use, I never get anything. On RGB scart the screen flickers for a moment then nothing, but the system remains on. Luma and composite just display these stripes. The only thing I can think of that may be bad is that I removed the RF box, and there are currently no cart slots, or floppy drives connected. The unit powers on fine, it's LED lights up. ANy help is appreciated.

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By AuroraMSX

Paragon (1902)

Аватар пользователя AuroraMSX

04-10-2009, 22:18

Did the SCART work before the transplantation? What exactly do you mean by "I removed the RF box"? Are you sure all the connections are fit and tight? A couple of pictures (not too big, please) could help...

By PingPong

Prophet (4093)

Аватар пользователя PingPong

04-10-2009, 22:22

If you toggle something like the caps lock key do you see the LED going on and off?
try to blindly type color , 15 <enter>
and see if something change on screen...

By Adam

Rookie (18)

Аватар пользователя Adam

04-10-2009, 23:01

SCART worked great before everything. I'll take some pictures in just a few minutes, I don't think it's my soldering though....

My computer does not have a caplock key.

By Jipe

Paragon (1594)

Аватар пользователя Jipe

04-10-2009, 23:07

check the switch on the main board : if is down the MSX don't start ( is in a testing mode with no rom )

By RetroTechie

Paragon (1563)

Аватар пользователя RetroTechie

05-10-2009, 00:17

I'd first check all supply voltages with a multimeter. You need both +5 and +12V to obtain an image on screen. Also: do you have all connectors between mainboard and analog board re-connected, not just the power supply? Perhaps check again if you plugged in the correct ones (MX -> AX, ML -> AL, MB -> AB, MP -> AP) ? And perhaps that service switch on the mainboard (white, square switch near the cartridge connectors) was pressed by accident.

My computer does not have a caplock key.
Yes it does, on the (external) keyboard. On the left, next to the spacebar, IIRC.

By Adam

Rookie (18)

Аватар пользователя Adam

05-10-2009, 01:13

I am getting 5 volts, -5, 12 and -12. The caps lock key isn't lighting up when I press it, but the consoles LED turns on. I connected all the connectors properly, and the switch is depressed. All I did was desolder all of the connectors, like the scart, controllers, etc. And place them somewhere else. I do not see anything suspicious, no shorts or anything.....

By pitpan

Prophet (3155)

Аватар пользователя pitpan

05-10-2009, 09:08

Dead BIOS or worse...

By MagicBox

Master (209)

Аватар пользователя MagicBox

05-10-2009, 09:13

Probably a dead VDP. Back in the days I've replaced many o VDPs in MSX2s. They're very sensitive.

CAPSlock not working etc is because the machine isn't getting interrupts from the VDP any more.

By pitpan

Prophet (3155)

Аватар пользователя pitpan

05-10-2009, 09:49

MagicBox: you've got the point there. If VDP fails, any interrupt-driven activity wouldn't work.

By Adam

Rookie (18)

Аватар пользователя Adam

05-10-2009, 16:21

Which chip is it? Is it dumped? Can I just burn a new one?

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