CTM 644 with strange RGB desync

[Targhan]

Sorry if this problem has been talked about a zillion times, but my faithful CTM644 has some strange display problem, as you can see...



I heard a "tac" sound then, the screen became "ok", then a few minutes later, another sound, and it went dark. I dare not turn it on again for fear to make the matter worse.

Is it something that can be repaired easily? There is a meeting in October in France, is it something that can be repaired there by skilled CPCists?

Thanks!

[Targhan]

@Kris Maybe that's something you know about?

[pelrun]

The coils in your deflection yoke have shorted. It's shown up here a few times before:


https://www.cpcwiki.eu/forum/hardware-related/problem-with-a-ctm644-monitor/
https://www.cpcwiki.eu/forum/hardware-related/another-dodgy-monitor-ctm-644/
https://www.cpcwiki.eu/forum/technical-support/i-burned-the-ctm-644-accidentally/

One of those was repairable! But the fact that your screen has gone dark since means there's probably been more damage done elsewhere.

[Kris]

As Pelrun said, the Yoke is shorted (damaged) but several other components as well...
Keep it for the meeting, I will check if I have a "full tube" available.

[Bryce]

I wouldn't be so sure that the coils are damaged. A few dodgy capacitors and failed transistors could cause this too, even without the coils being bad.

Bryce.

[Targhan]

Thanks for your replies!

@Kris Do you need me to buy some hardware "thingy" before the meeting?

[Kris]

Thanks for your replies!

@Kris Do you need me to buy some hardware "thingy" before the meeting?

Nope, wait untill we can do the diagnostic. 

[HAL6128]

Looks like a nice demo effect.