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 Tandy 1000 Display Issues View next topic
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rorysl



Joined: 21 Jul 2017
Posts: 2

PostPosted: Fri Jul 21, 2017 2:43 am Reply with quoteBack to top

Hey there,

I tried to power up my HX the other day, hooked to a CRT Television with a video RCA composite cable and am getting no proper picture.

There are no error beeps on start-up, unit seems to power up fine. Power light comes on and stays on. 3.5" drive light comes on and stays on Number lock and Caps lock lights respond to their button presses.

Screen, however, is black with garbled white lines. These lines could be the white Dos text scrambled or could just be interference, I can't tell.

I've tried hitting F2 when starting the Tandy to see if that will restart TV mode with no luck.

I've also tried typing MODE TV once the computer has booted with no effect either.

I made a video of the booting process for reference: https://youtu.be/AGH4LsxKfJQ

Unfortunately I have no Tandy monitor to hook it up to test and see whether or not it is only the composite output affected.

Hoping someone can offer up some advice!
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Puckdropper
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Joined: 02 Oct 2004
Posts: 741
Location: Not in Chicago

PostPosted: Mon Jul 24, 2017 9:17 am Reply with quoteBack to top

You might be getting a different signal from the Tandy than the TV expects. As I recall, computers from that era put out a combined video & audio signal like a VCR. You'll need a RF switch to connect to the TV. (I did see a coax to RCA adapter once, but I've never used one.)

Do you have an RF Switch anywhere around? If you've got a classic game system like a NES, SNES, Sega Genesis or Atari, you can use the RF switch from there. IIRC, automatic switches didn't always work properly with computers but would at least give you a picture.

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rorysl



Joined: 21 Jul 2017
Posts: 2

PostPosted: Wed Jul 26, 2017 2:43 am Reply with quoteBack to top

Based on my research it appears that, yes, the Cocos had RF output but the Tandy 1000's had composite output. Either way, it seems that after some research the issue is probably related to the power supply. Got a guy on it and will post back with results.
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