The Sinclair QL Forum

Thank you again,
I will read the manual, but it will take some time

I have noticed somewhere on internet that when the QL doesn't starts it have usually 2 reasons:
1. some maybe regualtor or transistor (I don't recall exactly )
2. ULAs - but as I have mentioned I have replaced both with new one

Thank you for info and manual
I will check what you have mentioned.

Some quick questions - if QL is running fine (I have never owned QL so it is difficult to me):
1. what is "default screen" - the menu in which user select video output with F1,F2 keys ?
2. should the microdrives start spinning when ...

Hi,
please can you help me with troubleshooting of my QL:
I have replaced:
- new cpu
- new roms
- new coprocessor
- new ULAs (both)
but the result is the same - no RGB output, just the yellow LED is lighted
What should I replace, or what shoud I measure (I have multimeters and digital osciloscope ...