Search found 8 matches

by Quickie
Mon May 21, 2018 6:23 pm
Forum: Hardware
Topic: QL Video issue - Red color missing
Replies: 14
Views: 2954

Re: QL Video issue - Red color missing

Hi all, Thanks again for all the provided information and suggested mods and improvements. This really increases my interest on the QL! :) Unfortunately I am currently trying to fix a couple of Dragon32's and I would prefer repairing them before retaking on the QL (which I currently consider fixed, ...
by Quickie
Thu May 17, 2018 9:27 am
Forum: Hardware
Topic: QL Video issue - Red color missing
Replies: 14
Views: 2954

Re: QL Video issue - Red color missing

Hi Juan, Actually that lead is an antenna cable connected to my LCD TV which fortunately still has an analog tuner. However I'm planning to do a home made RGB cable (which I'm now thinking that may have the zener diodes built-in) :) In that case I would plan to do the upgrade protection based on thi...
by Quickie
Wed May 16, 2018 10:18 pm
Forum: Hardware
Topic: QL Video issue - Red color missing
Replies: 14
Views: 2954

Re: QL Video issue - Red color missing

You'd want the zeners as close to the RGB socket as possible. That way you're protecting the 1377 too. Just from R/G/B/C/V to GND. You could probably do it on the underside of the PCB on the back of the RGB socket. You're absolutely right. This would be a much safer solution. I'll plan to do it onc...
by Quickie
Mon May 07, 2018 9:05 pm
Forum: The Welcome Area
Topic: Greetings from Spain
Replies: 7
Views: 1986

Re: Greetings from Spain

Thank you all for the warm welcome :) @jivrt - Gracias por los enlaces. No conocía todas esas revistas :D @Dave - I think the QL will fit perfectly on that computer niche that other 8/16 bits microcomputers did not fill: productivity :) The color pallete is awful, the sound chip is eons from SID, PO...
by Quickie
Mon May 07, 2018 8:47 pm
Forum: Hardware
Topic: QL Video issue - Red color missing
Replies: 14
Views: 2954

Re: QL Video issue - Red color missing

Thanks for the guidance. An ULA replacement is on the way. I'll post the results here (hopefully with the fixed QL) :) In regards of adding a zener diode to the lines it does make much sense for me after suffering this. I have some protoboards laying around home. I can create a very simple circuit w...
by Quickie
Sun May 06, 2018 10:23 pm
Forum: Hardware
Topic: QL Video issue - Red color missing
Replies: 14
Views: 2954

Re: QL Video issue - Red color missing

Hi Dave,

Thanks for pointing out the 8301 ULA.

Bad news: no activity on IC22 pin 30, while there is on pin 31 and 32.
Is it time to find a ULA replacement? :(

Cheers
by Quickie
Sun May 06, 2018 8:18 pm
Forum: Hardware
Topic: QL Video issue - Red color missing
Replies: 14
Views: 2954

QL Video issue - Red color missing

Hi, In my recent attempt to resurrect my QL I've been able to learn and fix it partially, but I still have some way to do, so just hope that someone with more experience and knowledge could help me a bit. Here are the facts: - Bought a non-working QL -> Did not even power up (No image on display, no...
by Quickie
Sun May 06, 2018 7:58 pm
Forum: The Welcome Area
Topic: Greetings from Spain
Replies: 7
Views: 1986

Greetings from Spain

Hi! Another one who joins the QL club family! Never used/saw a QL during my childhood, but being now a computer collector I came across a good opportunity and decided to acquire it. The first impression was that it looked like so familiar (I've been a 48k+ user since 8), but that was the only simmil...