MVS MV-4FS Repair Logs
Symptom: Dead. Had a note taped to it that there were lines in the graphics.
Unit was missing the BIOS chip. Programmed a replacement chip (27C1024) and booted it. It had lines in the graphics and was missing sounds. Board had been repaired before and had many chips replaced on upper and lower boards. It also had a dark liquid spill on the top board.
Checked all the previous trace repairs. Reset the Backup RAM to fix the sound issue. Cleaned the top board and the slot connectors to fix the lines in the graphics. Reassembled the board and replaced all the missing standoffs, screws, and mounting feet.