|
Post by jeremy on Dec 16, 2016 18:45:39 GMT -5
Ok, sorry it took so long but these aren't the easiest PSU's to get into and test, lol. Anyway, testing on + side of R214, the good PS reads a solid 2.426vdc in standby, and powered on with the lamp running.
|
|
|
Post by jeremy on Dec 16, 2016 16:33:54 GMT -5
Checking the voltage on the good PS is no problem, thats why it's still here . I'll take the good PS apart and test and get back to you with the results. Curious though, if say the trip voltage was say 2.5v and the voltage reading slowly continues to drop from 2.8 when powered on (like 10-20mv every 2 seconds), that would cause the shut down right? So what is causing the voltage to decrease if thats the case and not stay constant? Just thought I'd ask while I was replying
|
|
|
Post by jeremy on Dec 15, 2016 23:39:32 GMT -5
Okay shorted that out and it still makes the noise
|
|
|
Post by jeremy on Dec 15, 2016 23:11:29 GMT -5
Will do and get back to you MT
|
|
|
Post by jeremy on Dec 15, 2016 22:18:04 GMT -5
Also, the buzzing sound and the recent fan type noise, did it sound like they are coming from the lamp area? Or a transformer on the PS? Was more like a steady hissing/sizzle sound, its not coming from the lamp or ballast (makes the noise with ballast unplugged), I would assume a transformer on the PS but the Ballast and PS are sandwhiched so it's hard to tell exactly where on the PS it is coming from. It also makes that hiss/sizzle while in standby, doesnt change pitch or anything either when powered up, just the same steady sound as soon as the PJ is plugged in.
|
|
|
Post by jeremy on Dec 15, 2016 22:15:11 GMT -5
Looks like the pic below,
|
|
|
Post by jeremy on Dec 15, 2016 21:48:43 GMT -5
Yep, its either A532 or 4532
|
|
|
Post by jeremy on Dec 15, 2016 21:21:16 GMT -5
I should add, I left it on after getting those readings and the lamp/ballast shut off but the fans stayed running and the standby LED went back to standby mode. When I pressed power again it came back on, stayed on, lamp tried to light, but then the whole projector lost power for less than a second, and when it did, made a weird noise that sounded like a pencil being put into one of the running fans. It was in standby after that, I powered it on and it powered up and ran as normal again...
May mean nothing, thought I should include.
|
|
|
Post by jeremy on Dec 15, 2016 21:11:26 GMT -5
In standby the voltage reads 3.8vdc, when powered on it drops to about 2.8vdc (with the PJ & lamp running as normal), power it off, voltage goes back up to 3.8vdc. Also I replied to your PM
|
|
|
Post by jeremy on Dec 15, 2016 19:47:12 GMT -5
MT, Checked all those, they don't appear to be shorted at all. So I put PC102 back onto the board, tried it out, still shutdown after powering it on. Then I pulled IC202 off the board (got it off nice and clean even ), and tried it out again without IC202 but having PC102 back in place, it also works this way, but there is a hissing sound coming from the PS (to be fair, there was the same sound when I pulled PC102 off the board and tried it)
|
|
|
Post by jeremy on Dec 14, 2016 23:44:54 GMT -5
That would help MT, the Photo coupler isn't the issue, put a different one in and it behaved as it did before removing and testing (pulsing LED). What should I check?
|
|
|
Post by jeremy on Dec 14, 2016 22:49:23 GMT -5
Removed PC102, it powered on, stays on, lamp lights up, and it displays as normal... PC102 bad? I have another PS with a couple photo couplers on it
|
|
|
Post by jeremy on Dec 14, 2016 22:35:34 GMT -5
I'll do that and get back to you with how it behaves
|
|
|
Post by jeremy on Dec 14, 2016 22:18:15 GMT -5
Before soldering the pins, when the PS would shut down, it would basically lose all power for about a second (no LEDs, nothing) then power back up into its standby sequence and then you could press power again and repeat the cycle.
|
|
|
Post by jeremy on Dec 14, 2016 21:56:28 GMT -5
The voltages are on when the PS is pulsing, but the voltages do pulse a bit, for example: 5.3v drops to 5.1v every time it pulses, and its about the same difference for all the other voltages too, not a lot, but noticeable on the dmm by a few hundred millivolts
|
|