Infocus power supply isssue

[budm]

Re: Infocus power supply isssue

You have to use VA rating since the load (the projector) is not linear load, so 2.6A x 120V = 312VA, and you will be using 625VA, then you are OK.

[subarub4]

Re: Infocus power supply isssue

At full load, it will get quite warm. To extend the life, I would completely kill the power to the unit. if you are going to use UPS, make sure it is pure sine wave not step sine wave which has high harmonics, also has AVR (Automatic Voltage regulator), Extreme voltage shutdown circuits, surge and spike suppressor. The UPS should have at least 20% higher capacity than the load requires.

Well on the unit it lists lists it at 2.6A so that's around what 312-315W?

[budm]

Re: Infocus power supply isssue

At full load, it will get quite warm. To extend the life, I would completely kill the power to the unit. if you are going to use UPS, make sure it is pure sine wave not step sine wave which has high harmonics, also has AVR (Automatic Voltage regulator), Extreme voltage shutdown circuits, surge and spike suppressor. The UPS should have at least 20% higher capacity than the load requires.

[subarub4]

Re: Infocus power supply isssue

Components do fail, and also the standby power supply is always running the minute you apply the power to the unit even the unit is not switched on (in STBY mode), so it is running 24/7, the circuit will face any spikes and surges in the power line 24/7.

Well that makes sense, I plan on putting this on a 625 VA UPS once I get everything completed.

I assume the heatsink will run cooler on the MR4010 when it's replaced? I did not see any specs other then it says max output is 70W

[budm]

Re: Infocus power supply isssue

Components do fail, and also the standby power supply is always running the minute you apply the power to the unit even the unit is not switched on (in STBY mode), so it is running 24/7, the circuit will face any spikes and surges in the power line 24/7.

[subarub4]

Re: Infocus power supply isssue

What would cause something like this to happen?

[budm]

Re: Infocus power supply isssue

Ok.

[subarub4]

Re: Infocus power supply isssue

I would like you to check the Snubber Diode D202 to see if it is bad.

seems fine

[budm]

Re: Infocus power supply isssue

I would like you to check the Snubber Diode D202 to see if it is bad.

[subarub4]

Re: Infocus power supply isssue

So then the internal circuit that drive the Gate may be stuck high instead of turn the MOSFET on/off real fast like it should. At this point I would try new IC.

And that's going to take awhile since the only place I can find them is from China, when it does arrive I will have to see what the replacement one measures out to.

[budm]

Re: Infocus power supply isssue

So then the internal circuit that drive the Gate may be stuck high instead of turn the MOSFET on/off real fast like it should. At this point I would try new IC.

[subarub4]

Re: Infocus power supply isssue

I see 36.44k

[budm]

Re: Infocus power supply isssue

If you look at the spec sheet, pin 1 start at the first left pin, pin6 and 8 are not present but you will still count them, so last pin on the right is pin 9.

[subarub4]

Re: Infocus power supply isssue

I would say then the MOSFET is ON or it has low resistance between Source and Drain.

This is going to sound dumb but how do I find which pins are 5 & 9?

http://www.youtube.com/watch?v=5SMCC...ature=youtu.be

[budm]

Re: Infocus power supply isssue

I would say then the MOSFET is ON or it has low resistance between Source and Drain.

[subarub4]

Re: Infocus power supply isssue

That is not normal when you do not have anything else connected to the board.
1) It may be trying to run but the rectifiers in the secondary side is shorted so it is in the start/shutdown loop. Do you hear ticking sound from the transformer?
2) The internal MOSFET has leakage resistance so it is drawing the current all the time. Does it take long for the temp rise.
So you have to check the internal MOSFET Source (pin5) and Drain (pin9) to see what kind of the resistance you are getting, just make sure that the main filter cap is fully discharged first.

You know having been around a few SMPS now that's one of the first thing I checked for was to see if I heard any sounds and I did not.

And it does not take long at all to heat up.. I want to say within 2-3 min it's already over 100F.. you know what I'm going to go check now with a Temp probe.

I will check those pins

[budm]

Re: Infocus power supply isssue

That is not normal when you do not have anything else connected to the board.
1) It may be trying to run but the rectifiers in the secondary side is shorted so it is in the start/shutdown loop. Do you hear ticking sound from the transformer?
2) The internal MOSFET has leakage resistance so it is drawing the current all the time. Does it take long for the temp rise.
So you have to check the internal MOSFET Source (pin5) and Drain (pin9) to see what kind of the resistance you are getting, just make sure that the main filter cap is fully discharged first.

[subarub4]

Re: Infocus power supply isssue

That standby power supply (the transformer on the right edge of the board) is always on, so unless it has shorted load, it may not start up. You can power sup the board without that wire harness connected and see if you will get the standby voltages on the connector. There is an Device (TO-220 SMPS IC) mounted on the small heat sink which is the one that drives the STBY transformer, do you have the number printed on the body?

Ha perfect timing, I was going to upload the video to that but it's a MR4010 and when plugged in (the power board alone) I'm seeing temps of 115F on it... does that seem pretty high to you? I thought something like that only gets warm when a load is on it?

http://www.shindengen.co.jp/product_...duct_id=MR4010

http://www.youtube.com/watch?v=uVD_T...ature=youtu.be

[budm]

Re: Infocus power supply isssue

That standby power supply (the transformer on the right edge of the board) is always on, so unless it has shorted load, it may not start up. You can power sup the board without that wire harness connected and see if you will get the standby voltages on the connector. There is an Device (TO-220 SMPS IC) mounted on the small heat sink which is the one that drives the STBY transformer, do you have the number printed on the body?

[subarub4]

Re: Infocus power supply isssue

So are you getting any DC voltage on the wire harness to the main board? Is this projector? If it is, there should be lock-out safety switch that will not let the unit to turn on if the covers are removed or open, you may want to look for micro switches.

The switch is fine it's not the issue it wont power up at all because no stand by voltage on the low voltage wires if the IC would turn on I would suspect it would get power..

however I was looking at it today and the transformer which I assume is the SMPS one I have like 164VDC on the primary side but nothing on the secondary side.


Unless I looked at the wrong pins.

it has 4 pins on one side and 6 on the other.