Need help replacing the Z80 sound chip from neo MV-1F
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ttooddddyy
PNG FTW,
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Remember that these boards have three layers of track, double sided with tracks sandwiched inbetween for some connections like 5 volts and ground.
Unless you have experience working on these boards, I wouldnt recommend desoldering ICs. Z80 error messages are not necessarily caused by the Z80 itself.
I would check for broken traces around the associated memory 6116 and the SM1 rom before ripping out Z80s.
Unless you have experience working on these boards, I wouldnt recommend desoldering ICs. Z80 error messages are not necessarily caused by the Z80 itself.
I would check for broken traces around the associated memory 6116 and the SM1 rom before ripping out Z80s.
ttooddddyy
PNG FTW,
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Some are only double sided. Will try to make a list.
afaik there are diffrent versions of the 2 and 4 slot, one has the inner layer the other does not.
I think MKL may have some info on this
afaik there are diffrent versions of the 2 and 4 slot, one has the inner layer the other does not.
I think MKL may have some info on this
ttooddddyy
PNG FTW,
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we should pool the info and pass it on to Briggs to add to the HardMVS board listing.
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ttooddddyy said:
The presence of internal power and ground layers is irrelevant here as the holes of thru-hole mounted components are obviously not occupied by these layers. The holes, however, are double sided*, which means a component pin will be soldered on both solder and component side, making it pretty difficult to remove without the right tools.
* The holes on cart PCBs on the other hand are soldered only on one side and chips are therefore much easier to remove here, which explains why any idiot can make conversions...
dogtoy
Haomaru's Blade Shiner
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OK, so as long as you can properly desolder double sided you're good then?? I had no problems at all with the 5814 on my 4 slot. Lots of sucking involved with the desoldering iron bulb. Desoldering braid seemed to help lots when heating to melt the solder on both sides of the board.
cheers,
-DT
cheers,
-DT
Wow I never realised the chips in carts are only soldered on one side. I often wondered how people remove chips in carts after all the trouble I had desoldering the old bios from my aes.
If it's that easy maybe I'll have a go at converting some of my mvs carts.
If it's that easy maybe I'll have a go at converting some of my mvs carts.
ttooddddyy
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dogtoy said:
Just beware of this, once spent hours figuring out why there was a Z80 error message on a 1F before I realised that the mid track connection was missing on the 6116.