Machine without turning on the power supply response, there is no light is lit. vVKservice manual download site
29 p180gc belongs to MC1 movement, this kind of phenomenon, there are two possible, 1, 2, CPU power circuit circuit. vVKservice manual download site
Teardown inspection, found that IC801 / R801 D820 / D821 damaged, replacement of the above components, still 3 without after boot. Meanwhile T801 squeaking noise, this phenomenon shows that + B power supply load has a short-circuit point or due to over-voltage protection circuit action T801 emit squeaks, so detection line output stage circuit, found no short circuit problem. Indicates that the fault barrier point is still in power supply section, as D855 has breakdown, explain the power output voltage is too high, regulating circuit fault. As D896 breakdown, voltage sampling circuit, which is formed by IC885 and ground fault caused by light coupling D860 not working voltage. Replace the D869 troubleshooting.vVKservice manual download site