lhota
New member
I'm hoping more experienced people on the forums can help me.
When i turn the machine on this is what happens:
1. I get the "bong" sound
2. black screen ( guessing it is doing the rom check )
3. Displays CMOS OK screen
4. black screen
If you wait long enough eventually you will hear the demo being played.
I can press start and keep pressing the shoot button to select teams and players and get into the game. I can tell this is happening by listening to the audio and eventually hear the play-by-play.
Every once in a while one of 2 things will display.
thin line of across the screen made up of multiple colored pixels or a bunch of purple blocks.
Booting up with the test dip switch on shows the CMOS OK screen and reboots. It does not get to the settings menu.
I know this is a problem with the board because i have placed other pcbs in the cabinet and they work fine.
Here is what I've done:
1. I've cleaned the board
2. removed and tested the roms. They are all valid.
3. Checked the board to make sure all the resistors and caps are secured
The only things I can think is the ram is bad or one of the chips. It's pretty hard to find any detailed information on the board. The only thing I came across was the diagram from mame.
http://mamedev.org/source/src/mame/drivers/midwunit.c.html
This explains the chips on the board but not their usage.
There are 2 red leds
I'm hoping someone out there with MK3/hangtime/etc may have had a similar problem.
Any ideas?
Thanks in advance
Forgot to mention. There are 3 LEDs on the the board. 2 of them are right next to each other. in the attached picture the one to the right is constantly flickering.
When i turn the machine on this is what happens:
1. I get the "bong" sound
2. black screen ( guessing it is doing the rom check )
3. Displays CMOS OK screen
4. black screen
If you wait long enough eventually you will hear the demo being played.
I can press start and keep pressing the shoot button to select teams and players and get into the game. I can tell this is happening by listening to the audio and eventually hear the play-by-play.
Every once in a while one of 2 things will display.
thin line of across the screen made up of multiple colored pixels or a bunch of purple blocks.
Booting up with the test dip switch on shows the CMOS OK screen and reboots. It does not get to the settings menu.
I know this is a problem with the board because i have placed other pcbs in the cabinet and they work fine.
Here is what I've done:
1. I've cleaned the board
2. removed and tested the roms. They are all valid.
3. Checked the board to make sure all the resistors and caps are secured
The only things I can think is the ram is bad or one of the chips. It's pretty hard to find any detailed information on the board. The only thing I came across was the diagram from mame.
http://mamedev.org/source/src/mame/drivers/midwunit.c.html
This explains the chips on the board but not their usage.
There are 2 red leds
I'm hoping someone out there with MK3/hangtime/etc may have had a similar problem.
Any ideas?
Thanks in advance
Forgot to mention. There are 3 LEDs on the the board. 2 of them are right next to each other. in the attached picture the one to the right is constantly flickering.
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