Epson EB-675W Bulb does not power on
Epson EB 675W projector.
Blue power light when plugged in.
Press power button, blue power light stays on, blue status light starts blinking. Fan spins up normally, but bulb never lights up. Status light keeps blinking for about two minutes and then projector turns off, blue power light still lit. No reaction from any button press after initial power button press.
Have tried changing the bulb, no difference. Have had it open, removed and mounted the ballast board in another known good EB-475 I have, as they are practically the same. Ballast works fine. Power boards not identical, so can't try exchanging them.
I have done some more Research. All thermistors (temperature sensors) are Reading about the same resistance, 11.5k ohms. The Power supply seems to work properly, no bad caps or visible damage. Output voltage to the mainboard seems to work properly and Readings are consistent. The fans turn on and no fault lights when Power button pressed. Input voltage to ballast is 373V DC, which seems right. Tried changing ballast also the other way round from my other known good similar projector, and there is no change starting it With a known good ballast. Tried putting the bulb into the other projector, starts properly and lights up.
I’m really running out of ideas.
Had it been the safety switch, it should have cut all Power, not allowing the projector to start at all.
There is no voltage going to the bulb, so there is something in the Logic not letting it start.
I can not stop the projector again by pressing Power off two times, which would be the normal routine, which leads me to think the machine doesn’t start properly. Any ideas? Hard reset routines or computer diagnosis port would be helpful.