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One of my 1FZ boards came up with a calendar error, stuck on green. Iv'e changed the RTC crystal (the legs on the old one broke off) with a spare, after that stuck on green is gone, but now it says CALENDAR ERROR. I've already changed the 4990 IC with a spare, didn't do much. The signal on TP is...

Recently, I've got a MVS 1FZ board as a gift. The board boots up with only garbage on screen, but no watchdog kicking in, no click, just a static image of pixel soup. The clock on the 68k is there, clean 5 Volts around the board and no previous repair attempts visible. I've checked for broken...