channelmaniac
Professional
Which Quartz? Clock / Calendar or Main 24MHz?
NEO-MVH MV1FS Screen error
- Thread starter r67055
- Start date
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channelmaniac
Professional
That would cause all the issues you were seeing... crashing, block filled screen, stuck on green, calendar error, etc...
Glad you got it fixed.
what do they suggest, green screen error, filled screen error ...? what could be the solution?That would cause all the issues you were seeing... crashing, block filled screen, stuck on green, calendar error, etc...
Glad you got it fixed.
channelmaniac
Professional
"Calendar Error" and the "stuck on green" screen both mean the same thing - the system can't read the clock/calendar chip. I had one on the bench this week that had it because of a battery leak damaged trace. Battery damage is the leading cause of that error.
then does this mean that the motherboard cannot be repaired? can i throw it in the trash?
ic3b4ll
Professional
Don't throw it in trash, it can be repaired or used for parts. Keep it as a spare!
When you have a green screen or calendar error it's normally easy to fix.
Changing the 24 MHz crystal was because you had a very, very, VERY rare problem that I had seen only one time. It caused the stretched letters on screen.
i want to fix all 2 motherboards. i don't know what is causing the error
channelmaniac
Professional
What model Neo Geo is the one still stuck on green / has the calendar error?
I have 2 motherboards. one of which we did yesterday with the calendar error, the game started and only green stripes can be seen on the picture.
This is the fault of what you see in the pictures.
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channelmaniac
Professional
You're going to have to work your way backwards from the green output on the JAMMA edge connector.. This is where an oscilloscope will come in handy. Color RAM, latches, and driver chips in the video output are all suspect.
But, also check using a different monitor. Maybe that monitor doesn't like the video output...
But, also check using a different monitor. Maybe that monitor doesn't like the video output...
something is definitely not good with scart wiring then
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i connected something wrong. or the tv input matching is different? what is where i need to see a good picture? or is my jamma to scart connection not good?
channelmaniac
Professional
Someone else will have to help you there. We don't use SCART connectors in the USA.
I understand ! what do you use then?
ic3b4ll
Professional
You are missing a ground connection somewhere. Check that all pins that should be grounded really are, especially the blanking pin.
in the scart connector, do I check the ground pins?
ic3b4ll
Professional
Yes.