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RTC replacement in a HOT-433P

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First post, by Maleckii

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Should I be safe to desolder the RTC in my Shuttle HOT-433P and replace it with another module? The board I have has a DS12778A RTC, and I have a new DS12887 to replace it with. AFAIK, the "A" just indicates that there's a reset pin available, but on this board the trace for the reset pin goes nowhere.

I've read that some boards don't like it when you replace the RTC with a new one, since they assume some part of the clock is initialized. The battery on my RTC was flat, so I've already desoldered it, if only to put a socket in. I can either replace it with a new RTC, or do the battery mod on the existing one.

Reply 1 of 2, by bjwil1991

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Try the battery mod. If that doesn't work out, get a new module, plus the socket so that way it'll be easier to replace the chip.

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Reply 2 of 2, by Maleckii

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Considering how many of these modules I have laying around on various motherboards, I elected to not do the battery mod for now. I know I have at least one with a sufficiently charged battery.

Still, soldering the socket on was a great success! Dealing with 20 year old solder was a massive pain, and there's some good scorch marks on the bottom where I've melted the green coating, but it boots just fine with benchmarq module installed. I'll use the Dallas module I pulled out of the board to do the battery mod at some point, but for now I've got a working machine.

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