Search found 69 matches

by Traindriver69
Thu Jul 17, 2025 12:45 pm
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

Hi
I have replaced IC 21 today and all is good and now working fine It is a shame that I did not replace it before I ordered the replacement ram but it might come in useful in the future.
I would like to thank all those who have took the time to try and help me I would not have been able to get it ...
by Traindriver69
Mon Jul 14, 2025 10:05 am
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

Don't worry about the top pin of rom 1 when I removed the rom for checking the leg fell off so I had to do a bodge on it but I am now using the minerva rom.
Here is another pic of the other area.
IMG_20250714_100034.jpg
With IC 21 It was said that this IC21 (very low low probability of faulty one ...
by Traindriver69
Sun Jul 13, 2025 4:15 pm
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

Would it be worth getting some more ram chips first and try piggy back a few chips to maybe save some unsoldering and if that fails which chips would it be worth changing first to try and get the minerva memory check to work.
by Traindriver69
Sun Jul 13, 2025 11:58 am
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

Bit the bullet and replaced the cpu socket
IMG_20250713_114633.jpg
IMG_20250713_114644.jpg
It's booting up as before so I think everything went OK.
by Traindriver69
Sun Jul 13, 2025 9:44 am
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

I do have a vacuum desolder and a hot air station I am not the best at soldering so fingers crossed it s there anything to watch out for when doing it,
by Traindriver69
Sat Jul 12, 2025 8:18 pm
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

Hi
I have took all the seated chips out and gave them a quick clean a few days ago so today I was going to have another look at the sockets but as I tried to pull the cpu out I have broken the top of the socket so will need to replace that in the next couple of days before I can try anything else.
by Traindriver69
Sat Jul 12, 2025 2:00 pm
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

I do have a eprom programmer but the minerva rom is soldered direct to its adapter board so rather then damaging it trying to swap roms I would have to buy the bits.
by Traindriver69
Sat Jul 12, 2025 9:24 am
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

I have tried the heat test on the ram none getting hot and found one spare 4164 ram chip I have I tried piggybacking each ram chip but made no difference.
by Traindriver69
Fri Jul 11, 2025 6:05 pm
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

I have not done any work on it as yet and when I got it all the warranty stickers were intact.
by Traindriver69
Fri Jul 11, 2025 1:13 pm
Forum: Hardware
Topic: Sinclair ql black screen
Replies: 52
Views: 3622

Re: Sinclair ql black screen

Hi
It's funny I am in the process of trying the ram with minerva now
I am getting this screen which looks like it is trying to give a ram error but can't.
IMG_20250711_130458.jpg