Electronics > Repair

What more i can do?

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Harry_22:
Here are the Address and Data pictures of the first 20us for the working machine.
The first address is 3FFF8h.
The comparison for non-working machine I will make next.

222Lab_Test222:

--- Quote from: drhex on December 04, 2024, 09:48:40 pm ---Looks like all address signals are there? Didn't you say the high bits were missing on the EPROM? If they exist at the CPU and not at the EPROM this may well be your issue.
How many of these defect boards do you have? Maybe send a few around for people to have a direct poke?

--- End quote ---

To be honest, I think the address signals of the non working board is just dummy signals. Why?
because it keeps changing and is not constant. Also the GREEN LED makes the signals different, Either it glow or Not, it also affect the signals in non working board.

Now I have around 5 of them, I already  solved other 3 of them with same issue.

222Lab_Test222:

--- Quote from: asis on December 04, 2024, 11:43:25 am ---I admire your persistence.
I try to help as much as I can, as do many others.

But, I doubt that anyone will be able to generalize the data that you presented.


--- End quote ---
Is there any others things and checking you want me to do?
Any ideas or things is ok for me to check and inspect.

Harry_22:
How much boards have you already repaired?
Just for statistic.

222Lab_Test222:

--- Quote from: Harry_22 on December 05, 2024, 07:05:02 am ---How much boards have you already repaired?
Just for statistic.

--- End quote ---
I repaired 3, now i have 5 left of all same issues.

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