One of the lab's eppson projectors, which turned off normally on the first day, was disabled only because i turned off the brakes, and the next day it didn't work, the stand-by lights were on, and it was taken down and checked on the internet, with similar failures. Most of them point to the power supply. Is it a flood of electricity generated by a switch knife or a current that causes electrical damage
There are some maintenance cases in which the person who started the operation had to take it home and start dismantling it, so that the machine in eppson would be more open, there would be no dark screws and buttons, the screws on the back, and the screws under the front light bulb lid and the dust net lids would be removed, and the lid would open。
Take pictures of each of the plugs, start checking the main plate's power supply, lack the drawings, have a single needle-foot check, and find that when the plugs are pulled, the plug section has the voltage, and when it is inserted on the main plate, the voltage is gone? Is the main plate broken? It's a cold heart, it's better to fix the power, it's hard to break the main plate, it's another case of repeated maintenance, and it happens that there's a case of a short circuit on the main plate, resulting in power protection. After removing the plug, the watch between the plate v+ and the ground was indeed a few dozen om electrical resistance, and the short-circuited plate was nailed。
Checking the main plate with the nearest ic of the power is a tps54331, which is a voltage conversion chip, which was removed first, and short circuits still exist, with several and connected caps at the input end, all attached between the vin and the ground, and then starting with these。
It is not accurate to measure the electricity on a plate, which can only be removed, with one c2037,9. 5 uf and one c2032 not having been able to detect it, changing it, and with dozens of om, which is actually damaged, but which has become problematic, without any markings, and should have been two 4. 7 uf and one 0. 01 uf, according to the usual circuit map, and a 9. 5 uf on the plate, with a 0. 1 uf porcelain conversion. And reload ic55431。
Reload, stand-by lights are lit, and remote control is available to turn on, but the light bulbs are not on, and the lamp faillights are red. So the light bulb was removed and broken with a single watch, and it didn't make sense (there was a self-righteous error, thinking that the light bulb was all wired), and the light bulb was fixed。
A few days later, the supplier sent the light bulbs, which i checked with a one-size-fits-all watch, and the new light bulb was not working, realizing that the light bulb might not have been damaged or was a problem with the machine。
The real reason for reopening the machine with patience and tearing out the power module was that the plug that had been removed to power the light bulb had not been plugged out, and i had the impression that the plugs had been plugged, but had been careless. Reload, power, light bulb finally lit. There were two soundings inside the machine, a hint of an automatic optic failure. The machine had to be removed, the auto-circle found on the web video, and it was re-installed. Finally, everything's fine。
