20 Most Recent InFocus ScreenPlay 4805 Multimedia Projector - Page 5 Questions & Answers

Hello

Your Infocus projector has trouble with its power supply section. It is equipped with Switched Mode Type power supply, usually known as SMPS. To repair it you have to open the projector. You must have tools to open it, more patience and confidence. Moreover, it is most sophisticated entertainment item, parts are costly and sometimes difficult to get.
In my opinion, if your are fully aware of its construction and circuit, it is better for you get it repaired by any well experienced technician. Its SMPS circuit board is located in a place that you must open it and unassemble most of its components to access it. Still you wants to repair it by yoursef, inform me through Fixya. I'll assist you. OK.

Happy New Year

What I have just finished doing with my x2, because it was the controller board not giving enough voltage to the fan. I used my kiwi initiative and hard wired an old nokia cellphone charger transformer inside the projector and connected to the 240V inlet from the underside of the power supply board, this worked brilliantly and supplies the fan with the power, the only dis advantage is that the fan will keep spinning as long as the projector is plugged in (could be easily fixed with a switch), but the way I see it it's better for me because it cools the bulb down a lot longer. Saved me from buying a new projector Lol, if you would like I can send a pic of what I have done?

http://home.comcast.net/~jexkids/Ebay/colorwheel/How_to_replace_Color_Wheel.htm

Here is the only solution.

Hi it seem like the bulb/lamp has gone bad, you should change it.

Yes, it could be the glass fuse on the power supply/ballast. If you remove the top cover you should see it clearly if it has blown.

Powering On

If your InFocus 4805 projector is having a hard time powering on or doesn't power on at all, it could be one of two things. Due to the extreme temperature of the lamp that causes the temperature of the projector to rise, every InFocus 4805 projector has a cooling system. Check your projector's cooling solution, as it may need to be replaced. Also check the projector's fan---if the fan doesn't spin, the unit will not turn on. If the problem is the fan, you'll have to get it replaced. You can do this at the same place you bought your projector.

The Lamp

If your InFocus 4805 Projector powers on but does not project any light, the lamp will need to be replaced. All projector lamps must be replaced at some point---how often usually depends on how much use the device gets. Simply order a replacement lamp, unscrew the old one and screw the new one in. The projector will then work like new.

Color Wheel

If your InFocus 4805 projector powers on and is displaying images but the colors on the images appear warped or are not in the proper places, your "color wheel" will need to be replaced. The color wheel is a small device that essentially acts like a prism. Light is projected through it and it displays the appropriate colors on screen the way they appear in the original video source. Order a replacement color wheel that fits your model and use your instruction manual as a guide as you swap the old one out and put the new one in.

If possible take the lamp out and look straight down into the reflector. If you see a discoloration on one side of the reflector or spherical part at the bottom, it could be the lamp. Regardless, a polarizing filter is almost certainly suspect, and it could be going bad because of the above described problem with the lamp. If you buy it get a service manual and verify that the filter and the blue panel are available and at what price. Chances are it definitely will not be worth trying to repair this model, it will end up costing more than just replacing the unit unfortunately.

Thanks, let me know what you find,
Tim

If all screws are out of the bottom and the rear of the unit, pop the outer ring of the zoom/focus assy off using a wide flathead. Then flip the unit on it's back with the lens towards you. Grab the bottom of the front bezel with both hands and pull the bottom towards you until it pops out. At this point you should be able to see the clip things that are part of the top that the front snaps into. Place your flathead under the clip and twist up a little while pulling on that side of the front. Repeat for the other side of the front. Do the same for the rear.

check the wireing in the new bulb . My new one had the wires in the wrong holes like if there are 4 slots in the connector then my orignal was in slots 1 and 4 the new one was in slots 1 and 3 so I took the wire out and put it in the #4 slot and put it in and unpluged the machine and did a reset and restart and it came on green. Hope this helps.

Hi JF1226

This quite a tricky job , but not impossible.

You will see once you've taken out the light tunnel ( also known as the packlight pipe module ) that there is one or two of the small mirrors that has come loose as a result of the lamp's heat.

Glue them back with Super Glue that dries very fast.
Do them one by one , always try to build them back in from edge to edge i.e. - If the top one and left side one is loose , do the side one first and then the top one - just makes it easier.

Remember you only have one shot at this , so do it carefully.

Good luck and thanks for using Fixya.

it there is no high-pitched squeal when it starts up, the colorwheel needs replacing. the lamp won't light without it. the part is under $50, but installation is quite involved.

well, u might laugh at how i have solved this problem a couple of times... yea, the colour wheel on my sp4805 came apart to pieces, literally. the first time it was only two of the six segments, so i reglued em with SUREHOLD all american super glue. it lasted perfectly for about , say, 5 months or so... then, it happenned again this time shattering all of the six segments to pieces. oh, no!!!!! well, i breathed woundly and looked for the glue one more time... yes, an artesan work that took me about 3 hours and my eyes crying to almost perfectly glue together all of the six segments one by one, each one in pieces and this time the color, of course, isnt so perfect, but close to it... how long will it last this time? can someone tell me why no one sells this pieces, it would be a great business over the internet!!! i dont wanna bury my sp4805 in the backyard... and i dont know if the colour wheel can sustain any more glue... lol. well, its just a solution for a few months while u can save for a new proyector... shame for infocus... hope it helps u. let me know if u know about someone who sells color wheels ok?

Hi there

Yes, unfortunately it is another common fault, sad really lol
The remote not working could be due to the little remote sensor board that you will have seen when taking it apart (I have a service manual if you would like it), do any of the buttons on the unit itself work that you know of?
The bulb not lighting issue can be a number of things, usually a safety wise. When you replaced the fan, what were the specifications of the fan you used? Usually computer fans differ slightly to the ones used in this model, and can cause them to fail and the unit to over heat. If the projector switches on for a bit and then turns off, it means the safety thermostat in it is cutting out preventing overheating, you could try bypassing it just to see if the bulb will ignite. I know it may sound a bit dumb but check the safety switch on the door is fully in?
If you would like the service manual I could send it to you, I found it very helpful with mine, also a forum, I think AVS was extremely helpful aswell.

Sorry if this doesn't help, I will look into it further

Try brand new cables, but it is likely the segments on your colorwheel have come off and will need to be replaced by a tech. If you tilt the unit from side to side you can probably here the pieces moving inside.

The light tunnel is either out of adjustment or collasped. Given the age of your projector I would say it is the latter. This will have to be repaired by a tech or you may be able to fix if you can get the part and a service manual.

This likely a conncetion problem between the main board and the light engine. The added weight could be making the connection complete. You could open the projector and remove the ballast, power input board, and shield to remove the main board and clean the part that connects it to the bottom of the rear of the engine and then reseat the connection, BUT, this is a major task if you don't know what you are doing and is best left to a tech or living with the weight being on the unit.

the light tunnel is collapsing and needs to be replaced. you can get the part from an infocus service center or send it in to them for repair. either way, try av solutions in ny. they're really good. www.avsolutionsny.com

The light tunnel has likely collasped and will have to be replaced by a technician.

1 877.388.8360 call here--the address depends on your location.

Unless the set is probed and checked into the fault cannot be confirmed. It can be the powerr supply unit or the lamp .
I would suggest that you musta ttempt only if you are versed with electronics. If so check the power secondary voltages into the lamp , check the safety door lids switches, the filter.