Infocus power supply isssue

[subarub4]

Re: Infocus power supply isssue

A little update I got a Viewsonic projector that is a clone of the Infocus so they had the same power supply and mainboard, my projector starts up fine now.. I was STILL unable to find out why the other board still does not have power :-/

I checked the old with the new and the readings matched up :-/

[subarub4]

Re: Infocus power supply isssue

Getting 0V from IC101 (PFC IC) checking with the ohm meter the VCC pin of the PFC seems to be connected to C117A, C117, C116 which seem to be connected to the FSU10A60 The output pin on the PFC seems to connect to the same SMD caps but connects to D107, Q602 & Q603

[budm]

Re: Infocus power supply isssue

Check for the DC Voltage of the VCC pin of the PFC IC and its Ground pin. I do not recall the IC of number of this PFC IC, it has been a long thread.

[subarub4]

Re: Infocus power supply isssue

So I should be looking between the main and the PFC for something shorted or open circuit then? I was looking at D103 on the back of the board I think it's just reading both ways because it's in circuit, and for ZD204 it appears they are only using just one of the zeners.

I'm checking with a analog ohm meter

but yeah I suspect I was not going to see that voltage on the connector, One thing I might of been doing wrong as when checking for voltage on the PFC I should of been checking between VCC and the filter cap?

[budm]

Re: Infocus power supply isssue

If the PFC Voltage booster is not working, the DC voltage on that main DC filter cap will only be = line voltage x 1.414, you will not have 339V without PFC working.


https://cdn.badcaps-static.com/pdfs/...f33e6f6571.pdf

[subarub4]

Re: Infocus power supply isssue

Not mine but from a similar projector



I was told that regardless if the PFC controller was non fuctional I should still have like 339 VDC if not I must have a open circuit between the mains input and electrolytic filter capacitor, assuming the filter caps for the main?

[subarub4]

Re: Infocus power supply isssue

I was searching online today and I noticed the Acer X1220H has the same case design as my Infocus.. does this mean it uses the same power supply?

X1320WH is more closer to my infocus and from what I can see here

add the ViewSonic PJD5523w to the list of projectors as well.

[subarub4]

Re: Infocus power supply isssue

I thought about something I'm not sure what came before the In116 model projector (what I have) but I was thinking of getting a power supply close to the model since the connectors seem to be about the same.. whatever that does not fit I can swap over.

I figure it will turn on without any issues, too little current or too much voltage.

Since I know the standby should be around 5V and turn on would be 12V for the output I can go about that.

Tried of looking at the projector case in my closet and my color wheel and DLP chip in my wine cabinet.

[ben7]

Re: Infocus power supply isssue

And it did what I knew what was going to happen, a dead short because the pins are now reversed.

It blew the fuse? Did you check those leftmost pins in the picture to see if they were shorted together (they look bent/contacting eachother in your picture). Also the 3rd and 4th pins (from the left) look like they are shorting together too, in your picture.

[subarub4]

Re: Infocus power supply isssue

And it did what I knew what was going to happen, a dead short because the pins are now reversed.

[ben7]

Re: Infocus power supply isssue

Happy now?

Yes LOL

Just make sure those two pins on the left aren't shorted/bent together, and plug it in!

[subarub4]

Re: Infocus power supply isssue

Happy now?

[ben7]

Re: Infocus power supply isssue

So I want to ask you when I do it your way (throwing out the way Infocus did it) and it blows then what do I do? Why do you think I brought two of them

btw I had the same voltages as I did before with the original.

This time, please show us the chip before you plug it in, so we can tell you if it is soldered in the right way.

[subarub4]

Re: Infocus power supply isssue

The replacement "only" had its pins bent in different directions compared to the original, that's all. The order (and function) of the pins should be the same. By "different directions" i mean front-to-back, *NOT* side-to-side.

Quick comparison (original vs replacement):

Pin 1 - straight vs. bent backwards
Pin 2 - bent forwards, both
Pin 3 - straight vs. bent backwards
Pin 4 - bent forwards, both
Pin 5 - straight vs. bent backwards(?)
Pin 6 - cut
Pin 7 - bent forwards vs. bent backwards
Pin 8 - cut
Pin 9 - straight vs. bent forwards

Not sure if you've noticed, but these multi-pin SIP (Single In-line Package) solutions, where the pins are bent, they're bent *ONLY* along the forward-backward plane, and *NEVER* from side to side. What you did was simply reverse where pins 7 and 9 go in the circuit, and, well...

Quite likely, 1) you toasted the new MR4010, and 2) less likely, caused further damage in the primary "half" of the power supply.

"Assumption is the mother of all f**k-ups" - you'll have to excuse the harsh language, but i've seen that adage proven true time and time again

Edit:

The original doesn't seem to have its legs crossed, as opposed to the new one: https://www.badcaps.net/forum/attach...7&d=1369707694

So I want to ask you when I do it your way (throwing out the way Infocus did it) and it blows then what do I do? Why do you think I brought two of them

btw I had the same voltages as I did before with the original.

[Khron]

Re: Infocus power supply isssue

The replacement "only" had its pins bent in different directions compared to the original, that's all. The order (and function) of the pins should be the same. By "different directions" i mean front-to-back, *NOT* side-to-side.

Quick comparison (original vs replacement):

Pin 1 - straight vs. bent backwards
Pin 2 - bent forwards, both
Pin 3 - straight vs. bent backwards
Pin 4 - bent forwards, both
Pin 5 - straight vs. bent backwards(?)
Pin 6 - cut
Pin 7 - bent forwards vs. bent backwards
Pin 8 - cut
Pin 9 - straight vs. bent forwards

Not sure if you've noticed, but these multi-pin SIP (Single In-line Package) solutions, where the pins are bent, they're bent *ONLY* along the forward-backward plane, and *NEVER* from side to side. What you did was simply reverse where pins 7 and 9 go in the circuit, and, well...

Quite likely, 1) you toasted the new MR4010, and 2) less likely, caused further damage in the primary "half" of the power supply.

"Assumption is the mother of all f**k-ups" - you'll have to excuse the harsh language, but i've seen that adage proven true time and time again

Edit:

The original doesn't seem to have its legs crossed, as opposed to the new one: https://www.badcaps.net/forum/attach...7&d=1369707694

[subarub4]

Re: Infocus power supply isssue

What the replacement looked like...



and the original with it's machine bent legs..

[subarub4]

Re: Infocus power supply isssue

The pins are not twisted it's just how it is, I did not bend the pins in the same way the original was.

And for the info it still gets as hot as the original did.

And if you saw I blew the fuse because I used my oscilloscope on the MAIN input, had I used a isolation transformer I would had no had the issue, if you think it's not true wait until my replacement fuse comes in.

[ben7]

Re: Infocus power supply isssue

No wonder why it is getting very hot! xD

[Khron]

Re: Infocus power supply isssue

Ummmm... Why are the last two legs of the MR4010 "twisted" like that, pray tell?

Did the original one look like that, as well?

Edit: Nnnnnnope...

https://www.badcaps.net/forum/attach...0&d=1368496802

What you did there, was (most likely) reverse the Source and Drain pins of the FET inside the MR4010 (so basically you're putting the +160Vdc through the Source-Drain parasitic diode, straight to ground). No wonder you blew the fuse...

Edit 2: Correction - you reversed the Drain with the Vin pin, so you shoved +160v DC into the low-voltage section of the PWM chip. Pins are numbered for a reason, y'know...

[subarub4]

Re: Infocus power supply isssue

Could we get some macro shots of the bottom of the board on the secondary side?

And, on the bottom of the board on the primary side? (Near the mr4010)
Also, on the top of the primary side? (Again, near the mr4010)

underside looks a little rough with all the flux..