A puzzle for ya (UK)

[Badders]

I was using my C64 (breadbin) with an LCA cable and a 1084S monitor. I then switched to a C64C using the same cable and monitor. No problems.

Then one day I turned on the monitor and there was no picture. I tried another LCA cable. No picture. I tried another monitor. No picture.

I tried 2 other C64s, no picture.

I've just received another 1084S, and still no picture. So, that's 3 C64s (2 x breadbin, 1 x C64C), 2 cables and 3 monitors. No picture when before all was working great.

I also have a SCART cable, and that works fine on all machines.

The only difference between the LCA cables and the SCART is the DIN plug. The SCART cable has 5 pins, the LCA cables are fully pinned, so I can't test them on the VIC-20.

Over to you guys 

Pete.

[RobertB]

     Wow, I'm stumped.

                Truly,
                Robert Bernardo
                Fresno Commodore User Group
                http://videocam.net.au/fcug
                The Other Group of Amigoids
                http://www.calweb.com/~rabel1/
                Southern California Commodore & Amiga Network
                http://www.sccaners.org

[RobertB]

     O.K., I've been thinking about it for awhile.  If you were using the same, bad power supply between the various C64s, then you wouldn't have a picture.  How about trying a different power supply?

                 Truly,
                 Robert Bernardo
                 Fresno Commodore User Group
                 http://videocam.net.au/fcug
                 The Other Group of Amigoids
                 http://www.calweb.com/~rabel1/
                 Southern California Commodore & Amiga Network
                 http://www.sccaners.org

[Badders]

Well, I've used 2 different C64 supplies, the original wedge shaped one and a black, ribbed brick. Also the new custom one I got made by Doc of Desire.

Also, I get picture just fine on the TV using the SCART cable.

It is indeed a puzzle 

Pete.

[Paul]

The 1084s has a bad reputation for dying unexpectedly; I think it's the flyback transformer.  Have you tried connecting something else to the monitor to see if it's able to display anything?

[Badders]

That's what I thought, but there's 3 different monitors. Also, the RGB connector works fine on my A1200.

Pete.

[Paul]

If you've tested out the C64 on a known working display and that worked, and you know the cable is good (easy to check with an ohmmeter), then the fault has to lie with the monitor.  It could be that the RGB/CVBS switch isn't working properly.

[Badders]

I could understand that with 1 monitor, but all 3? Possible I suppose.

These things are sent to vex us 

Pete.

[RobertB]

I then switched to a C64C using the same cable and monitor. No problems.

Then one day I turned on the monitor and there was no picture. I tried another LCA cable.

I'd go with another cable again.  All 3 monitors cannot be bad, but cheaply made (read: badly made) video/audio cables would be more likely.

                Truly,
                Robert Bernardo
                Fresno Commodore User Group
                http://videocam.net.au/fcug
                The Other Group of Amigoids
                http://www.calweb.com/~rabel1/
                Southern California Commodore & Amiga Network
                http://www.sccaners.org