This logic board is clean and tidy (unlike some others I deal with that have had battery leakage or damp storage…) and yet unfortunately, it displays the vertical bars typical of a ROM fault.
I’ve swapped the ROMs and the RAM with a working logic board, to determine that they are OK.
Could you please give me some guidance on how to test further - could it be the CAS chip at fault, or something else responsible for addressing ROM or RAM? I have a 10MHz handheld oscilloscope but have never had much skill with recognising signals with it - I need to know what to look for
I have various other Plus logic boards for spare parts, including one that worked a few months ago but will not power on now. At least this one with the vertical bars powers on…
I tried searching far and wide and found someone else on Reddit with the same screen display - unfortunately, not solved.
Thanks for any advice
I’ve swapped the ROMs and the RAM with a working logic board, to determine that they are OK.
Could you please give me some guidance on how to test further - could it be the CAS chip at fault, or something else responsible for addressing ROM or RAM? I have a 10MHz handheld oscilloscope but have never had much skill with recognising signals with it - I need to know what to look for
I have various other Plus logic boards for spare parts, including one that worked a few months ago but will not power on now. At least this one with the vertical bars powers on…
I tried searching far and wide and found someone else on Reddit with the same screen display - unfortunately, not solved.
Thanks for any advice