The power supply of an apogee projector that used to be in the home had been in trouble for some time, the voltage was unstable and it was left out of control. The recent interest in power maintenance on the switch turned it over, and the examination revealed that the foot of the main filter 100uf450v had been corrupted and that there were drums, but that the measuring of the cap was close to 100uf and that there had been no apparent leakage, so a toe-to-foot load was taken, with the power output 19v and the projector powered。
Who knows, after pulling out the 19v plugs, measuring the main filter-capacitor at two ends of the voltage soars until 500 v, and the output end voltage soared immediately below 10 v, and asked the soybean bag, saying that the leak was caused by the leak, that it was cut out, that it was a single one, that it was replaced by a new one when the goods arrived, and that was the same as usual. Then we start looking for similar cases, looking for the rationale, plus ai, for reasons ranging from runaway pfc circuits, malfunctioning of light circuits, broken feedback signals, or tl431 steady voltage circuit failure, etc。
Dap013d19v60w power source rationale
Power front
Power back
According to the circuit map (which is closer to the map attached to the manual), the bean bag was asked for direct call on the light plaster 816 and then the plate test seemed to react. The bean bag said it might be in bad or not bad state, so it found a 817 replacement, the failure remained, the surrounding parts were measured, there was little deterioration, there was little movement, and the bean bag recommended a video of the voltage from 300v to 500v, which was somewhat similar, and the blogger made a special circuit, explaining that there was a double-compression phenomenon, a decomposition and normality. The circuit boards were carefully observed, and the recommended circuits did have two capacitors and two diodes next to the current bridge, with separate and interactive inputs linked to the straight-flow output end, with conditions for double pressure, which were not included in the road map of the manual. Several components were not damaged. So boldly removed one of the capacitors, 0. 47 uf, without realizing that a miracle had occurred and that the main filter had returned immediately to normal 320 v. The voltage output is still 19v, which provides normal power supply。
In order to determine the reason for the electric cap, it was rewelded and the voltage was actually raised to 500 v。
It's like white, and it's supposed to be a question of circuit design, because when it's loaded, it's very high, but after all, there's no power consumption and very small currents, so the caps are not broken so fast, but over a long period of pressure, the caps are still leaking, and then the corrosives break the trigger and completely fail。
Ai was able to help analyse the reasons, but sometimes it was self-evident that it had to be proved carefully。
