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MVS MV1B/1C battery replacement

dysfunctional said:
Wow, that's a game changer for sure :D. Would love to buy a few if that's possible :)
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Yeah no problems,
This was actually my interim solution to not having to remove anything from the MVS to replace the old battery. I have been working on a supercap solution as well, however I thought I should regulate the input and output of the cap and once I did this the cap only gave you a few days to a week (it was months prior). At that point I decided that I needed to both look at the MVS diagram to get a better idea of the changing circuit and design a more efficient circuit out of the cap. It works as just a cap with no additions I am just not sure this is a great idea. Anyway for now a diode battery blaster circuit appears to be working.
 
One all soldered up
 

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So after replacing the faulty capacitors on the board, how long does the battery last? The fact that the clock is reset is not terrible, it's bad that the neobios region and console mode are reset.
 
Do you have some available for sale? I’d be interested in 2 or 3 myself. What’s required besides this pcb?
 
Yeah I got 20 pcbs made up so I have a number spare. I also have all the parts:
1 x 1N5817 or 19 schottkey diode
1 x 2032 batter holder 3 pin vertical
3 x single header pins
It will be cheaper (I think) to ship as a kit rather than assembled but I could probably do either. Give me a day or so to work out shipping costs and I'll DM you. Thinking something like $10 each but ill check what everything cost as I may be able to do a bit better than that.
 
Big_P Big_p said:
Yeah I got 20 pcbs made up so I have a number spare. I also have all the parts:
1 x 1N5817 or 19 schottkey diode
1 x 2032 batter holder 3 pin vertical
3 x single header pins
It will be cheaper (I think) to ship as a kit rather than assembled but I could probably do either. Give me a day or so to work out shipping costs and I'll DM you. Thinking something like $10 each but ill check what everything cost as I may be able to do a bit better than that.
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Awesome, man. I’m curious to know if the battery holder can be flipped parallel or if the pins won’t tolerate a bend. I’ve just gotta fit it within a console case as this is for a consolized MV1-B. If I could find a perpendicular CR2032 battery holder on digikey with the same pin configuration I would order it, I just don’t know how to search for it honestly.
 
Big_P Big_p said:
Yeah I got 20 pcbs made up so I have a number spare. I also have all the parts:
1 x 1N5817 or 19 schottkey diode
1 x 2032 batter holder 3 pin vertical
3 x single header pins
It will be cheaper (I think) to ship as a kit rather than assembled but I could probably do either. Give me a day or so to work out shipping costs and I'll DM you. Thinking something like $10 each but ill check what everything cost as I may be able to do a bit better than that.
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I'm very interested too, a kit is perfectly fine, please DM me also when ready :).
 
NOAH said:
Awesome, man. I’m curious to know if the battery holder can be flipped parallel or if the pins won’t tolerate a bend. I’ve just gotta fit it within a console case as this is for a consolized MV1-B. If I could find a perpendicular CR2032 battery holder on digikey with the same pin configuration I would order it, I just don’t know how to search for it honestly.
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I don't think the pins are long enough to be bent and I have not found any flat battery holders with 3 pins either. I actually designed it upright to mimic the original battery but it does stick up a tiny bit further than the original. I was thinking of doing a flat one as well as one for the PGM but haven't gotten around to it yet.
 
Ok, so I installed the diode battery holder pcb and was thrilled when I turned my console off for a day and it saved the bios settings. However, after 3 days in the console the brand new Panasonic CR2032 reads 2.08 volts and doesn’t hold the settings for more than about half a minute or so.
 
Can you check if you have any reverse voltage at the holder when on. I don't on mine but once it's in the MVS its a little hard to check others. The other issue could be that you have a high draw on the battery when off this is typically one of the smd passives in the bios circuit. Let me know how you go.
 
Is it an MV1c? These are notoriously bad for draining batteries. A few things can go to cause this but C3 (0.1uf) is often the cause.
 
Big_P Big_p said:
Can you check if you have any reverse voltage at the holder when on. I don't on mine but once it's in the MVS its a little hard to check others. The other issue could be that you have a high draw on the battery when off this is typically one of the smd passives in the bios circuit. Let me know how you go.
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ISo check the battery holder without the battery with the console powered on? Where would these SMD passives be found? Sure is annoying though, this consolized MVS I bought has been good for the money other than the bios/save situation.
 
C3 0.1uf 0806 cap goes and causes a drain.

Also check

C10 (it could be PC3 and PC10) - 0.1uf 0602 cap
U3 - 74HC32 SOP8 if pins 12 and 13 have a voltage it tries to power the MVS off the battery (I doubt it's this because your drain takes a few days)
RAM2/RAM4 - 256kx8 sram SOIC28 (i have never personally seen this issue but many people have reported it being a problem).

It shouldn't be a reverse voltage issue with that battery holder. Meter the battery when in the MV1b and if battery is losing about 0.01v every few seconds, it's most likely c3 (which quite often, but not always just falls off when you touch it with tweezers when it's gone). If it's not that goto C10.

If you need any more help DM me.
 
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