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Re: Screen fault
Posted: Sat Jun 28, 2025 4:28 pm
by Popopo
Martin_Head wrote: Sat Jun 28, 2025 4:07 pm
If you have some very small side cutters, you can (with the power off) snip off the legs of those IC's next to the body of the chip to remove it. This will also make the later removing the legs easier.
This method is for very skilled techs, if you don't instruct him properly he could cut tracks off, blow them up, scratch the PCB...
Perhaps I am too worried about everything

Re: Screen fault
Posted: Sun Jun 29, 2025 8:57 am
by Wicksy
Am now considering sending the QL to a place in Wales for repair when money allows.
Re: Screen fault
Posted: Sun Jun 29, 2025 11:20 am
by XorA
Wicksy wrote:Am now considering sending it to a place in Wales for repair when money allows.
Awesome, it's worth getting them mended!
Re: Screen fault
Posted: Sun Jun 29, 2025 4:07 pm
by Popopo
Wicksy wrote: Sun Jun 29, 2025 8:57 am
Am now considering sending the QL to a place in Wales for repair when money allows.
Nice idea!
Re: Screen fault
Posted: Sun Jun 29, 2025 10:20 pm
by stephen_usher
If you have the ability to write an EPROM, a spare 28 pin chip socket, 74LS04 chip and you have basic soldering skills you could make one of my "dead test" diagnostic ROMs as described here:
viewtopic.php?t=5305 and replace the system ROMs.
*IF* the ZX8301 and ZX8302 and CPU aren't terminally damaged it should show you what's working. It doesn't need any working RAM to do the initial memory test and show that there's some life in the machine.
Re: Screen fault
Posted: Sat Jul 05, 2025 11:26 am
by Wicksy
Thanks Stephen but am a very low level user.
Re: Screen fault
Posted: Sun Jul 06, 2025 11:12 am
by Popopo
Keep us update with the progress or what you decide to do.
It doesn't matter your level, if you want to learn, we could teach.