Electronics > Repair

What more i can do?

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m k:

--- Quote from: 222Lab_Test222 on December 16, 2024, 07:54:45 am ---Did it (EPROMS DATAs) says or shows anything regarding where the issues are?  :scared:

--- End quote ---

No.

Do the swap and new scoping and do them exactly like before.

Harry_22:
Great job getting real information out of those ill-fated EPROMs!
Cool!

@222Lab_Test222, and as always you will have to work with your hands.
Would you going about to perform a little of the old in-out, in-out (please see the picture).

We are looking for contacts with poor clamping.

222Lab_Test222:

--- Quote from: Harry_22 on December 16, 2024, 12:14:28 pm ---Great job getting real information out of those ill-fated EPROMs!
Cool!

@222Lab_Test222, and as always you will have to work with your hands.
Would you going about to perform a little of the old in-out, in-out (please see the picture).

We are looking for contacts with poor clamping.

--- End quote ---
I can try that.
Check all the poor solders and clamps?
just check with hands? Whats a little in out things, i do not understand, i saw the picture BUT still unclear.

222Lab_Test222:

--- Quote from: squadchannel on December 16, 2024, 10:12:03 am ---worked ROM and the didn't work ROM are exactly the same binary.
the problem is not in the ROM but still elsewhere. therefore, replacing the ROM will not change anything.

Is it an RTC, is there more to it, or can it be cured with a magic finger like in curiousMarc's PS/2 repair video? 8) I don't know. :-//

--- End quote ---

I just watch his video, well there was same CPU as we used in this motherboard, the way he program that Beep Code was insane.

Harry_22:

--- Quote from: 222Lab_Test222 on December 16, 2024, 12:18:24 pm ---
just check with hands? Whats a little in out things, i do not understand, i saw the picture BUT still unclear.

--- End quote ---

I suppose that the reason may be in the weakened contacts of the DIP-circuit bushings under IC16.

I would advise you to take any DIP chip, bend one leg and try the clamping force of the contacts one by one.
If all the contacts are tight, spray them with contact cleaner and go around in a circle with this chip making an in-out.

It would be better to change the entire IC panel, but only do this if my guess is confirmed.

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