Plus electric moments power indicates lamp bright, description switch power up vibration, then lamp out, is for stopped vibration, this description load has short-circuit or switch power itself out fault. will line load disconnect, with 40W/220V bulb false load, then plus electric, power on can up vibration. except -12V output partial low outside, remaining 70V, and 13V, and 56V output are basic normal. to this seems to should determines is line scan circuit fault, so on line scan circuit for seriously troubleshooting, not found exception, Almost find again has all and line circuit related of components are no results. then and back check to power Shang, does power with load capacity low? that and why can makes 220V/40W (or 60W) bulb points bright, and output voltage stable? on power part of related components for check, but not found obviously problem, does power module IC601 (DP104C) performance bad? try with with a new of power module (DP104C) replaced IC601, plus electric try machine, results all normal.


Note: this is a classic failure, has encountered more than one in the actual maintenance symptom similarity, IC601 (DP104C) due to bad performance.