Yamaha MSX cx5m powering up but nothing on the screen?

Door msxxy

Supporter (2)

afbeelding van msxxy

06-03-2020, 12:47

It powers up but not getting anything on the screen. I've been told it could possibly be the video chip?

If anyone knows what the issue or solution here could be, that'd be wonderful. Alternatively if anyone knows of any people who do parts or repairs/rebuilds that'd be great also.

Many thanks for any help.

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Van Wlcracks

Champion (421)

afbeelding van Wlcracks

06-03-2020, 16:43

does caps lock led work? does sound output with ctrl+g (beep) work?

Van sdsnatcher73

Paladin (977)

afbeelding van sdsnatcher73

06-03-2020, 17:09

It’s most likely the PAL encoder if your CAPS works and you hear a beep. It’s cheaper than the VDP luckily Wink

Van msxxy

Supporter (2)

afbeelding van msxxy

07-03-2020, 11:05

Thank you both! The power supply checks out okay.
Caps lock = good.
Ctrl+g = no beep!

Van Wlcracks

Champion (421)

afbeelding van Wlcracks

07-03-2020, 11:59

1 - to be sure, caps lock led toggles when pressing the caps lock key?
2 - there is no beep at the audio output, not even when normally the msx screen beeps when booting up?
3 - if the caps lock works (cq toggles) you would expect key "ticking" from the other keys through the audio output.