Another faulty ZX Spectrum 48K 3B
Posted: Mon Jan 13, 2020 8:53 pm
Hello guys
I've just repaired a ZX Spectrum+ thanks to you, but now I need your help on a classic ZX Spectrum 48K Issue 3B
When turned on, sometimes it hangs on white screen, or yellow borders
or sometimes it boots, but displays weird stuff at the bottom, and when i press a key it beeps or displays random instructions
I have checked the voltage on 4116 RAMs, and +5v, -5v and 12v are delivered correctly
Here is the video of its behaviour :
https://youtu.be/L4qp5CkJQjA
Can you help me diagnose the problem ?
Faulty RAM ?
Thanks guys
I've just repaired a ZX Spectrum+ thanks to you, but now I need your help on a classic ZX Spectrum 48K Issue 3B
When turned on, sometimes it hangs on white screen, or yellow borders
or sometimes it boots, but displays weird stuff at the bottom, and when i press a key it beeps or displays random instructions
I have checked the voltage on 4116 RAMs, and +5v, -5v and 12v are delivered correctly
Here is the video of its behaviour :
https://youtu.be/L4qp5CkJQjA
Can you help me diagnose the problem ?
Faulty RAM ?
Thanks guys