The Sinclair QL Forum

Hi

I understand you but when you feel for it and are less frustrated cut the pins near the IC. Then apply solder flux and gently heat the pin and use a pair of pliers/Tweezers to remove pin by pin.

Anyway, well done trying to save the QL.

Do you have more than standard memory?
Check pcb, I had similar result indicating different ICs from time to time. For me it was logic circuitry.

Hi,

Yes pin 1.
I had a look and it is connected on top layer, I would clean it up a bit and reflow using flux.
Measure so you have connection to IC12 pin 13 ( and the others)

Hi,

I can take a photo for you, its pin 4 right? If so it should be connected, test with multimeter if its connected to IC 10 and same pin. Could be that the tracks are on top layer.

Hi

Send a photo of the damage, usually you can use a thin wire to make a new pad or track. Can be fiddly but worth it, if it works then secure with some epoxy.

Hi,

What happened when you desoldered IC11?

You will fix it don't worry! Are the logic circuits ok? Did you try several times and got the same result pointing towards IC11?

Sounds wise! It was just so you had them in case there’s a problem with memory. Update what you get with Minerva installed.

If you decide to desolder then first cut the pins or use a sharp knife. Then desolder pin by pin!!

Good luck!

Hi

Get the ones that are turned, they have thinner pins. If you have solder paste put some in each before you insert the cable.

Hi,

I had multiple problems, a loose cable inside the DIN connector gave random green screen, then faulty logics gave different errors every time I booted, looked similar to what you posted. They are not expensive to order the ICs mentioned just in case, get 74HC instead of LS.

/Chris

Here are the ICs I mentioned: viewtopic.php?t=4557&sid=b7cb256a363fbe ... 031a4cfff4
Try to get A minerva or if you enjoy soldering just replace IC19-21, advice you to sacrifice them by cutting the pins and de solder one by one. You can always replace IC by IC.