stern monopoly. when it boots, the display comes up, and constantly shuts down and re starts. L200 on the cpu board flashes 2 times, goes, out and does it all over again, repeatedly. blanking led blinks pretty much in time with the cpu led and display. there is zero corrosion, it looks like new. 5v is rock solid. there was some corrosion in the battery holder, but nothing made it to the board, it looks like new. i yanked it, put in an nvram, no help. im going to do all the pinout tests as if it were corroded, but is there anything else i should look for? does 2 flashes mean anything? i read a post saying you can use leons data east test prom, is that true?

thanks

id have to dig for that leon thing. a few months ago i repaired a whitestar with pretty heavy bat damage, and it worked out well. i dont really remember though how i tested it. i believe 5v and gnd, and then switch matrix was active. do they boot on the bench with just 5 v? i know i did have it working on the bench before i put it in the game. i also used the pinwiki battery damage pinout chart, and i think there may have been an error or 2 in it. right now on the bench i have a solid L200 led, but no matrix activity.

thanks

i know for sure i had a harley davidson board on my bench working without a driver board, with the switch matrix active.

well, i got the board to boot up on the bench. pin 37 of the cpu( reset) is staying low, never goes high. if i put 5v to pin 37, the boards boots, address lines are active, the switch matrix is active. dont know why the reset stays low. does it need the I/O to boot properly ? im sure i remember a harley davidson board booting on my bench, without jumpering 5V to the reset line. the game is not nearby to test it in. can anyone explain the reset circuit and what to look for?

thanks

chris, i hit a wall. reset at cpu stays low. jumper it 5 v , the board boots. if i power up the board with the reset line jumpered to 5v, no boot. had to be powered, then 5v to the reset. not sure if there is a problem on the board, or it needs the IO board. the game is not near enough to give it a go. i might have a friend nearby with a stern to try it in. if its a bust, can i send you the board?

thanks

here is what i learned. i believe my monopoly board is working correctly. i had the chance today to work on a sega goldeneye( whitestar board). first i booted the sega board in the game with the io ribbon cable disconnected. it booted. im thinking oh crap, the monopoly board didnt boot on the bench without an io board, it must be no good still. . i then put the monopoly board in the sega game, with the io board and display ribbons connected. guess what, the monopoly board booted, showed the game rom version in the display, switch matrix active. i remember having a harley davidson board also boot on the bench, with no IO. maybe some games will boot independantly, and some wont? software? board revision? who knows. anyway, im going to make the trip, put it back in the monopoly game and see what happens. no reason it shouldnt work, as it worked in the goldeneye.