Any danger for Philips VG-8235 / NMS-8245 mainboards?

By Cmon

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26-07-2017, 19:35

I just stumbled across a youtube comment regarding caps in danger of leaking in some Panasonic MSX computers (https://www.youtube.com/watch?v=xHrehtHvdsQ&list=PLdWnWjSmMD...), so I immediately got worried the same could go for my 2 precious Philips machines.

Are there some parts you recommend to change in order to prevent mainboard apocalypse? Or are they safe :)

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By meits

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26-07-2017, 21:07

Yes. In the 8245 you should remove the battery.

By hardwaremaker

Master (243)

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26-07-2017, 22:00

The VG-8235 has a battery too.

By meits

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26-07-2017, 23:34

Not that one, but remove it anyway.

By Louthrax

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26-07-2017, 23:48

I never had to replace capacitors on a VG-8235 so far (that's not the case for my Sony machines), but I replaced the battery on all of them (if they start leaking, that can really damage the board). Very easy to do, and those replacement batteries / capacitors are cheap and easy to find on eBay

By Cmon

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27-07-2017, 11:00

Where is the battery located and what does it look like? any pics maybe?

By Louthrax

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27-07-2017, 12:15

It depends on your machine.

On the VG-8235, the battery is labelled "Memo Power", 2.4V 250mAh. Its location depends on the version of your VG-8235, but you can't miss it (it's quite big):

On the VG-8245, it's a different model (the big blue cylinder on the bottom-right part):

You can remove it if you want to be safe, but you'll just not be able to keep the RTC settings of your MSX (screen width, colors, date...). Not a problem if your MSX does already not memorize it anymore (test it by letting your MSX powered-up for some hours if you have not used it for a long time and check if things are memorized after that).

You can replace that with an equivalent battery, or by a combination of two batteries. It looks like the VG-8245 batteries are more likely to start leaking than the VG-8235 ones.

By Cmon

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27-07-2017, 14:21

Ok, I'll remove both. Thanks!

Where can I get future-proof (high quality) batteries which aren't in danger of leaking soon?

By hardwaremaker

Master (243)

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27-07-2017, 14:34

Cmon wrote:

Ok, I'll remove both. Thanks!

Where can I get future-proof (high quality) batteries which aren't in danger of leaking soon?

I think that the best is don't put any battery, but if you want, connect the battery to the board with cables, and put the battery as far away as possible of the board, and insulated with retractable plastic.

By Cmon

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31-07-2017, 08:19

I have a question regarding the battery shown in the lower picture (taken from NMS-8245). What is that blue thing, does that have to be removed too? I seems to be a coin battery inside that blue cylinder.

Would I need to desolder that blue cylinder?

By hardwaremaker

Master (243)

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31-07-2017, 08:35

Two coin batteries, exactly as the 8235, but in another position.
Yes, you need to desolder the blue cilinder.