Merçi have already answered. On my multimeter (vc650), the leading integrated circuitry was dead, he warmed the multimeter showed: OL and its consumption was 300 mA !! (Origin: WENS50), I was able to download the schema (even on this forum), and they put KS57C2616 .... I now put the new Integrated Circuit (I verified the magnifying lamp the state of the welds). But the problem is that it does not turn on. Therefore you must reprogram it with software, or there's some other explanation you there