Any tips on where to start troubleshooting? (MVS MV2F) - garbled graphics /boot
- Thread starter mawrick
- Start date
Any tests I could to to it, as far as I'v been able to tell the traces are good.
All test on diag rom passes, but when doing individual tests I see this behavior on the Palette ram test (not sure if it's supposed to act like this or not):
Attachments
Yes test is ok, check here at 39:29 time
If moving card is not changing line, get a logic probe and test zmc or replace it.
Here my example of zmc broken:
Hello Guys,
Doing some repair on a mv2f that i buy for 30Euro....
It have some battery leak corrosion over ZMC.
After some line problem repaired the image start look normal but it seems one more contact somewhere is to be checked
Fix layer are ok, i'm not sure about one more zmc2 contact because i check every pin one by one, and they are all connected.
What can be the cause of that error ?
Doing some repair on a mv2f that i buy for 30Euro....
It have some battery leak corrosion over ZMC.
After some line problem repaired the image start look normal but it seems one more contact somewhere is to be checked
Fix layer are ok, i'm not sure about one more zmc2 contact because i check every pin one by one, and they are all connected.
What can be the cause of that error ?
Retro Mecano
Enthusiast
Yes test is ok, check here at 39:29 time
View: https://youtu.be/YYWc4_uM0oA?si=VQo_Znj0mDUrtQVU
If moving card is not changing line, get a logic probe and test zmc or replace it.
Here my example of zmc broken:
Hello Guys,
Doing some repair on a mv2f that i buy for 30Euro....
It have some battery leak corrosion over ZMC.
After some line problem repaired the image start look normal but it seems one more contact somewhere is to be checked
Fix layer are ok, i'm not sure about one more zmc2 contact because i check every pin one by one, and they are all connected.
What can be the cause of that error ?
Wierd thing is that he stated that original bios is still watchdogging..
Diag bios passes, unibios passes but with graph and sound issues.
I am not sure but my finger points towards neo-do or neo-c1...
Of course assuming that original bios ic is fine and socket is also fine with all connections behind.
My bad, the initial post/board boots fine with a new unibios, but have these vertical lines when in game and neo-geo logo/unibios logo. so on that board only these lines, and possible missing right channel music is the problem.
The board that watchdogging is a second 2-slot I have here, sorry for the confusion
Retro Mecano
Enthusiast
My bad, the initial post/board boots fine with a new unibios, but have these vertical lines when in game and neo-geo logo/unibios logo. so on that board only these lines, and possible missing right channel music is the problem.
The board that watchdogging is a second 2-slot I have here, sorry for the confusion
Then for the first board, I join the guys up on the Neo-ZMC2 possibility. If you have a multimeter, you might also check connection to the catridge slot connections to the zmc area. I have seen similar issue on 1 slots having this problem due to some vut traces to the cart slot.
Another less common problem, is having a Neo-Io starting to fail, but this would scramble the whole fix layers.
lithy
Student
I just got done finishing an MV-2F with lines in the graphics, so while it is still fresh I can post some stuff here for you to start checking, you can see my repair log here.
https://www.neo-geo.com/forums/index.php?threads/help-for-mv-2f-with-bram-issue.272773/
I'm definitely no expert, but if the cart is showing the same graphical errors in both slots it is likely not the C rom traces from the cart slot to the NEO-273.
Instead test continuity of pins for NEO-ZMC2 specifically 1-50, 79, and 80.
pin 79 ZMC to pin 44 NEO-B1 at E6
pin 80 ZMC to pin 45 NEO-B1 at E6
pin 1 ZMC to pin 46 NEO-B1 at E6
pin 2 ZMC to GROUND
pin 3 ZMC to pin 47 NEO-B1 at E6
pin 4 ZMC to pin 65 LSPC2 at D8
pin 5 ZMC to pin 147 LSPC2 at D8
pin 6 ZMC to pin 110 LSPC2 at D8
pin 7 ZMC to pin 109 LSPC2 at D8
pin 8 NO CONNECTION
pin 9 ZMC to pin 66 LSPC2 at D8
pin 10 ZMC to pin 53 NEO-B1 at E6
pin 11 ZMC to pin 54 NEO-B1 at E6
pin 12 ZMC to GROUND
pin 13 ZMC to pin 55 NEO-B1 at E6
pin 14 ZMC to pin 56 NEO-B1 at E6
pin 15 ZMC to pin 8 NEO-257 at J2
pin 16 ZMC to pin 11 NEO-257 at J2
pin 17 ZMC to pin 23 NEO-257 at J2
pin 18 ZMC to pin 27 NEO-257 at J2
pin 19 ZMC to pin 9 NEO-257 at J2
pin 20 ZMC to pin 12 NEO-257 at J2
pin 21 ZMC to pin 24 NEO-257 at J2
pin 22 ZMC to pin 28 NEO-257 at J2
pin 23 ZMC to GROUND
pin 24 ZMC to 40 pin NEO-257 at J2
pin 25 ZMC to 43 pin NEO-257 at J2
pin 26 ZMC to 55 pin NEO-257 at J2
pin 27 ZMC to 59 pin NEO-257 at J2
pin 28 ZMC to 41 pin NEO-257 at J2
pin 29 ZMC to 44 pin NEO-257 at J2
pin 30 ZMC to 56 pin NEO-257 at J2
pin 31 ZMC to 60 pin NEO-257 at J2
pin 32 ZMC to pin 8 NEO-257 at K2
pin 33 ZMC to VCC
pin 34 ZMC to pin 11 NEO-257 at K2
pin 35 ZMC to pin 23 NEO-257 at K2
pin 36 ZMC to pin 27 NEO-257 at K2
pin 37 ZMC to pin 9 NEO-257 at K2
pin 38 ZMC to pin 12 NEO-257 at K2
pin 39 ZMC to pin 24 NEO-257 at K2
pin 40 ZMC to pin 28 NEO-257 at K2
pin 41 ZMC to pin 40 NEO-257 at K2
pin 42 ZMC to GROUND
pin 43 ZMC to pin 43 NEO-257 at K2
pin 44 ZMC to pin 55 NEO-257 at K2
pin 45 ZMC to pin 59 NEO-257 at K2
pin 46 ZMC to pin 41 NEO-257 at K2
pin 47 ZMC to pin 44 NEO-257 at K2
pin 48 ZMC to pin 56 NEO-257 at K2
pin 49 ZMC to pin 60 NEO-257 at K2
pin 50 ZMC to pin 27 NEO-D0 at G11
Reference pages with pinouts
https://wiki.neogeodev.org/index.php?title=NEO-ZMC2
https://wiki.neogeodev.org/index.php?title=NEO-257
https://wiki.neogeodev.org/index.php?title=NEO-D0
https://wiki.neogeodev.org/index.php?title=NEO-B1
https://wiki.neogeodev.org/index.php?title=LSPC2-A2
https://www.neo-geo.com/forums/index.php?threads/help-for-mv-2f-with-bram-issue.272773/
I'm definitely no expert, but if the cart is showing the same graphical errors in both slots it is likely not the C rom traces from the cart slot to the NEO-273.
Instead test continuity of pins for NEO-ZMC2 specifically 1-50, 79, and 80.
pin 79 ZMC to pin 44 NEO-B1 at E6
pin 80 ZMC to pin 45 NEO-B1 at E6
pin 1 ZMC to pin 46 NEO-B1 at E6
pin 2 ZMC to GROUND
pin 3 ZMC to pin 47 NEO-B1 at E6
pin 4 ZMC to pin 65 LSPC2 at D8
pin 5 ZMC to pin 147 LSPC2 at D8
pin 6 ZMC to pin 110 LSPC2 at D8
pin 7 ZMC to pin 109 LSPC2 at D8
pin 8 NO CONNECTION
pin 9 ZMC to pin 66 LSPC2 at D8
pin 10 ZMC to pin 53 NEO-B1 at E6
pin 11 ZMC to pin 54 NEO-B1 at E6
pin 12 ZMC to GROUND
pin 13 ZMC to pin 55 NEO-B1 at E6
pin 14 ZMC to pin 56 NEO-B1 at E6
pin 15 ZMC to pin 8 NEO-257 at J2
pin 16 ZMC to pin 11 NEO-257 at J2
pin 17 ZMC to pin 23 NEO-257 at J2
pin 18 ZMC to pin 27 NEO-257 at J2
pin 19 ZMC to pin 9 NEO-257 at J2
pin 20 ZMC to pin 12 NEO-257 at J2
pin 21 ZMC to pin 24 NEO-257 at J2
pin 22 ZMC to pin 28 NEO-257 at J2
pin 23 ZMC to GROUND
pin 24 ZMC to 40 pin NEO-257 at J2
pin 25 ZMC to 43 pin NEO-257 at J2
pin 26 ZMC to 55 pin NEO-257 at J2
pin 27 ZMC to 59 pin NEO-257 at J2
pin 28 ZMC to 41 pin NEO-257 at J2
pin 29 ZMC to 44 pin NEO-257 at J2
pin 30 ZMC to 56 pin NEO-257 at J2
pin 31 ZMC to 60 pin NEO-257 at J2
pin 32 ZMC to pin 8 NEO-257 at K2
pin 33 ZMC to VCC
pin 34 ZMC to pin 11 NEO-257 at K2
pin 35 ZMC to pin 23 NEO-257 at K2
pin 36 ZMC to pin 27 NEO-257 at K2
pin 37 ZMC to pin 9 NEO-257 at K2
pin 38 ZMC to pin 12 NEO-257 at K2
pin 39 ZMC to pin 24 NEO-257 at K2
pin 40 ZMC to pin 28 NEO-257 at K2
pin 41 ZMC to pin 40 NEO-257 at K2
pin 42 ZMC to GROUND
pin 43 ZMC to pin 43 NEO-257 at K2
pin 44 ZMC to pin 55 NEO-257 at K2
pin 45 ZMC to pin 59 NEO-257 at K2
pin 46 ZMC to pin 41 NEO-257 at K2
pin 47 ZMC to pin 44 NEO-257 at K2
pin 48 ZMC to pin 56 NEO-257 at K2
pin 49 ZMC to pin 60 NEO-257 at K2
pin 50 ZMC to pin 27 NEO-D0 at G11
Reference pages with pinouts
https://wiki.neogeodev.org/index.php?title=NEO-ZMC2
https://wiki.neogeodev.org/index.php?title=NEO-257
https://wiki.neogeodev.org/index.php?title=NEO-D0
https://wiki.neogeodev.org/index.php?title=NEO-B1
https://wiki.neogeodev.org/index.php?title=LSPC2-A2
Last edited:
maki
Student
the error is typical for issues with the ZMC2, the traces are obviously affected and should be fixed, all of them, the dark spots are a give away, thats corrosion and its still going
I wash these boards like dishes with a soft brush, cleanse with water, then IPA 99% to dry off, then in the oven at no more than 60C for an hour
the water and IPA will take care of the remaining battery gunk
then I'll tin the affected traces around the ZMC2 which I take off to check/fix all the traces
your multimeter beeping doesn't mean the trace "is fine"
most multimeter will beep when resistance is below 100Ohm, thats not "fine"
there is no need to check with a multimeter IMO
the damage is obvious and very typical for MV2F, the DIAG BIOS error points straight to the rotten traces/ZMC2, nothing obscure IMO
I had a few like these, that is a typical problem as the traces to/from the ZMC2 run right past the battery, and this one always leaks :/
I wash these boards like dishes with a soft brush, cleanse with water, then IPA 99% to dry off, then in the oven at no more than 60C for an hour
the water and IPA will take care of the remaining battery gunk
then I'll tin the affected traces around the ZMC2 which I take off to check/fix all the traces
your multimeter beeping doesn't mean the trace "is fine"
most multimeter will beep when resistance is below 100Ohm, thats not "fine"
there is no need to check with a multimeter IMO
the damage is obvious and very typical for MV2F, the DIAG BIOS error points straight to the rotten traces/ZMC2, nothing obscure IMO
I had a few like these, that is a typical problem as the traces to/from the ZMC2 run right past the battery, and this one always leaks :/