A520 Juming Screen Only Before Workbench

[AmigaHeretic]

The only thing that got me thinking kickstart is that I noticed that for like half a second the screen turns red when I first turn the amiga on.

Yeah, I think red is for rom issue on startup.  So worth re-seating and checking.  Maybe the rom issue is having effect on the rgb port, but not the b/w video out.

[Super TWiT]

Turned out to be my tv. I connected the amiga to my tv and the jumping picture happened. Connected my amiga to my pc via the capture card (same cables) and PERFECTION. Weird problem... It's a cheap polaroid tv that has been known to also turn only one channel on our satellite service purple. I assume it assume the tv won't hurt my amiga will it?

[AmigaHeretic]

Turned out to be my tv. I connected the amiga to my tv and the jumping picture happened. Connected my amiga to my pc via the capture card (same cables) and PERFECTION. Weird problem... It's a cheap polaroid tv that has been known to also turn only one channel on our satellite service purple. I assume it assume the tv won't hurt my amiga will it?

That was pretty weird. Reminds me of a time I somehow moved the brighness on my 1084 all the way down so there was no visible picture.  I had an A2000 at the time.  I tore it all apart, PSU out, and everything.  I cleaned it all up, reseated chips, tried different configs of cards.  Always a blank screen.

When I noticed the knob was turned down I felt totally stupid.  Had a nice clean A2000 though.

[gertsy]

Turned out to be my tv. I connected the amiga to my tv and the jumping picture happened. Connected my amiga to my pc via the capture card (same cables) and PERFECTION. Weird problem... It's a cheap polaroid tv that has been known to also turn only one channel on our satellite service purple. I assume it assume the tv won't hurt my amiga will it?

You beat me to it.  I was just gonna say I have an old Panasonic 68" TV that works perfectly with my A520 but my new'er 89" TV Jumps every so often and does the same B&W startup.

Thats why I got this : http://www.amigamaniac.com/RGB_to_PAL_NTSC_adapter.html Rock solid on s-video all the time with no colour satuartion probs.

BTW: The TV might hurt the Amiga if it topples forward.  But apart from that unless your TV has curcuit problems we are talking millivolts here.

Gertsy

[Super TWiT]

Actually, this seems to only happen with the side inputs on my tv. The back ones are fine.

BTW, I was plugging my amiga into the tv's rear inputs, and I heard a buzzing noise from the tv as I accidently tried to plug the audio prong into the video jack. The amiga was off (power supply was plugged in but switched off), and I had left the tv on. Wikipedia says that RCA cables can cause equipment damage because the hot connection makes contact before the cold screening connection. However, I would think because the amiga was turned off it wouldn't hurt anything right?

[Zac67]

However, I would think because the amiga was turned off it wouldn't hurt anything right?

Actually, a simple connections to mains can be enough even if a device is switched off - if you're in very bad luck. The buzz you were hearing was proof that there was some voltage on the cable (there always is).

Connecting ground first is a smart way to equalize potentials w/o causing damage - unfortunately RCA jacks aren't built that way. It's good practice to switch off everything before connecting up.

[amigadave]

That was pretty weird. Reminds me of a time I somehow moved the brighness on my 1084 all the way down so there was no visible picture.  I had an A2000 at the time.  I tore it all apart, PSU out, and everything.  I cleaned it all up, reseated chips, tried different configs of cards.  Always a blank screen.

When I noticed the knob was turned down I felt totally stupid.  Had a nice clean A2000 though.

It is hard to remember to always check the simplest things first.  I am guilty of similar stupid oversights myself from time to time.