Electronics > Repair

do ram chips break much?

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coppercone2:
I have to replace a TC5514P to trouble shoot my 4191A.

Is it likely that ram chips like this break? Do they have a bad reputation? I know modern computer ram is pretty shady.

I noticed one of the batteries was dead (0.4V, the other was 1.1V).

I read about those old logic chips possibly getting burn out when they get stuck on a voltage near some thresh hold. Is it common for them to go when batteries go? In this case it might have been running at 1/2 standby voltage for a long time. Some gate can get stuck in transition region on the chip and burn out?

Kind of like the problem when you have too much fan out, it says that can break some chips physically if signal is low. I thought maybe if power is like that it might not like it and stress something?

fzabkar:
I replaced numerous SRAMs, DRAMs, and PROMs during the 1980s.

coppercone2:
I don't like my odds because its 2020s

this unit was working but it was a little futzy sometimes, you needed to reset it sometimes. Maybe it was a sign of that ram going bad.  ???


Lol, I have the god damn calibration standards for this thing too. Failure is not a option. It was supposed to be my inroad to impedance understanding.

fzabkar:

--- Quote from: coppercone2 on September 12, 2024, 04:21:10 am ---I don't like my odds because its 2020s
--- End quote ---

I'm looking at a datasheet dated 1985 ...

coppercone2:
The first thing they need to build on mars is a semiconductor factory so they can replace their life support assy when it gives a e21


I like this machine though, it is fairly easy to work on like a pickup truck, I don't have elevated vital signs when I am thinking about doing a card level repair on it. Putting that PCB on the hood that lifts up is a brilliant idea. I wonder how many heart attacks that prevented.

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