Infocus power supply isssue

[subarub4]

Re: Infocus power supply isssue

The closest thing to a datasheet that i could find, is this:



Now, Elite is one of the "replace on sight" brands, for me

There's a small SOIC8 chip on the bottom of the board (that's the PFC controller) - what do the markings on it say?

heh I saw that same data sheet and I had the "huh" feeling when I saw it.. and Elite haha another one... I guess any name is better then nothing as soon as I saw that I wanted to change out every one of them I saw.

SOIC8? Forgive me but where on the board is that?

[Khron]

Re: Infocus power supply isssue

The closest thing to a datasheet that i could find, is this:



Now, Elite is one of the "replace on sight" brands, for me

There's a small SOIC8 chip on the bottom of the board (that's the PFC controller) - what do the markings on it say?

[subarub4]

Re: Infocus power supply isssue

"Just" 164V DC means the PFC definitely isn't working. That plug seems to be coming straight from that big reservoir/filter cap (that's at the output of the PFC) and normally, it should indeed be in the 380-390V DC area.

I'd say it's a safe bet that among that wire harness on the secondary (top right corner in the first photo), one of the wires is actually the PS_ON signal, which turns on the whole shebang.

Second "suspect" would be the two small electrolytics near the main PWM (lower right in the first photo). What brand / series are they?

Hey thanks for responding, the wire harness goes to the main board which has the power switch however when plugged up and before I took everything apart when the projector is off the standby light should show (it does not) also pressing the power switch did nothing..

The two small electrolytic caps are Elite branded

C208 is 22 uF 50V
C204 is 47 uF 35V


The funny thing is the TO-220 which is a MR4010 for sure works, I used a IR temp gun and it gets up to around 122 F/ 50 C

Also at the lamp output I'm not getting anything.. at the black Cap which is 150 uF/450V I'm getting 164V at that but pretty much after that I have nothing.

The transformer on the far right says on the board O/P 5V/.15A| 12V/3.6A

[Khron]

Re: Infocus power supply isssue

"Just" 164V DC means the PFC definitely isn't working. That plug seems to be coming straight from that big reservoir/filter cap (that's at the output of the PFC) and normally, it should indeed be in the 380-390V DC area.

I'd say it's a safe bet that among that wire harness on the secondary (top right corner in the first photo), one of the wires is actually the PS_ON signal, which turns on the whole shebang.

Second "suspect" would be the two small electrolytics near the main PWM (lower right in the first photo). What brand / series are they?

[subarub4]

I've been looking at this for hours but can't figure it out.. I have no power going to the projector, so I took the power supply out and I do have power coming in to it, but something is funny.. I have 120V in and about half way with the caps and all it seems the board is at 164VDC however the low voltage cable has no power to it, the plug for the ballast should have 390V but it has nothing.

Hopefully these pictures will help