Technos Wrestlefest arcade pcb repair
Two different boards with the same sorts of glitches – corrupt sprites, bad palettes and sometimes no video output at all. Sometimes the corruption would change if you pressed on different chips on the board.
Pressing on the board to make a difference is often a hint surface mount custom chips are not making good contact. On both boards some pins of the TJ-003 custom were lifted and not making a solid connection. On one board the TJ-002 custom also had some lifted pins. The solder was reflowed and both boards back to 100%.