Amiga.org

Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: christopherpm on February 01, 2016, 08:04:41 PM

Title: CDTV jumping display
Post by: christopherpm on February 01, 2016, 08:04:41 PM

Hi, I have a CDTV with a display issue (Rev 2.2.1 motherboard). After being switched on for a couple of minutes, the display starts flickering / jumping.

I have 2 x RF video modules, 1 x scart video module and a 23-pin->Scart cable - all of which were working fine for absolutely ages. This issue is a few weeks old.

I have removed the casing, and cannot see any signs of leakage on the electrolytic capacitors.

Any help to keep this CDTV going would be really appreciated.

Title: Re: CDTV jumping display
Post by: paul1981 on February 03, 2016, 03:04:42 AM

Quote from: christopherpm;803278

Hi, I have a CDTV with a display issue (Rev 2.2.1 motherboard). After being switched on for a couple of minutes, the display starts flickering / jumping.

I have 2 x RF video modules, 1 x scart video module and a 23-pin->Scart cable - all of which were working fine for absolutely ages. This issue is a few weeks old.

I have removed the casing, and cannot see any signs of leakage on the electrolytic capacitors.

Any help to keep this CDTV going would be really appreciated.

Not wishing to insult your intelligence here, but have you tried a different display?

I'm only saying it because you haven't mentioned it.

Title: Re: CDTV jumping display
Post by: mechy on February 03, 2016, 04:55:03 AM

Quote from: christopherpm;803278

Hi, I have a CDTV with a display issue (Rev 2.2.1 motherboard). After being switched on for a couple of minutes, the display starts flickering / jumping.

I have 2 x RF video modules, 1 x scart video module and a 23-pin->Scart cable - all of which were working fine for absolutely ages. This issue is a few weeks old.

I have removed the casing, and cannot see any signs of leakage on the electrolytic capacitors.

Any help to keep this CDTV going would be really appreciated.

I would check all psu voltages.
if they are good, reseat the chips.
if that doesn't work i would possibly suspect caps.

Title: Re: CDTV jumping display
Post by: utri007 on February 03, 2016, 07:34:18 AM

I had same problem with my CDTV. Cure was keep it on several hours.

It wasn't used for years, so I ques capasitors just needed some juice.

Title: Re: CDTV jumping display
Post by: christopherpm on February 03, 2016, 10:47:03 AM

Quote from: paul1981;803383

Not wishing to insult your intelligence here, but have you tried a different display?

I'm only saying it because you haven't mentioned it.

Actually no. It's connected to my living room TV. I have connected it the SCART socket, RF and via composite and all three give the same outcome.

Anything else that gets connected to the TV works just fine (as did this CDTV until a little while ago).

Title: Re: CDTV jumping display
Post by: christopherpm on February 03, 2016, 10:48:26 AM

Quote from: utri007;803396

Cure was keep it on several hours.

I worry that keeping it on may cause further damage, and I really don't want that to happen!

Title: Re: CDTV jumping display
Post by: christopherpm on February 03, 2016, 10:49:17 AM

Quote from: mechy;803390

I would check all psu voltages.
if they are good, reseat the chips.
if that doesn't work i would possibly suspect caps.

I will do so at the weekend.

Title: Re: CDTV jumping display
Post by: midway on June 11, 2016, 03:02:57 AM

There are SMD caps (electrolytic ones) which can leak. Mine was flickering when on the DCTV start screen when I used the Cinch output, bot the SVideo. when you pull out the video module look for leaked cap signs.

Title: Re: CDTV jumping display
Post by: christopherpm on June 11, 2016, 10:12:55 AM

I've had the CDTV diagnosed, and it was a faulty Agnus in my MegAChip causing the issue