called to this fella today. it is all off. no display or noise of any description.checked power to the pcb. took it out to look for damage, non found.
any simple reason why or if pcb where to look. the fuse resistor is ok.
about the only thing you can fix on the board is the power supply. find the 12v side of the supply and measure it. if its there or comes and goes then board scrap. if no output may be the chip