When the projector is on even without any inputs going through the projector the screen is full of small red square all over.
I replaced the lamp thinking that was the problem but it has not made any difference.
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Depends on the model. If you saw a little fan, then there is a fan problem. There might be 3 fans. 2 square ones and one blower fan. Look for plugs with 3 wires(red/white/black or red/yellow/black). Those will lead to the fans from the mainboard. Occasionally the fan will spin but the tachometer lead will stop reporting the fan status and the projector shuts down. To being with I would clean out the projector fans and ducts thoroughly. That may clear up the issue. Otherwise there is a button press sequence to enable the service menu, but you cannot upload new firmware without special optoma software that isnt available. Another possibility is you have failing filter capacitors in the power supply. Be careful poking around under the hood. There is lethal high voltage possibly stored even when unplugged.
two possible solutions----either a problem on the small circuit board that is connected to the RED picture tube OR the red screen control is turned up too high. These sets have a small square block with RED,Green, Blue screen controls(same place also has red, green, blue Focus controls) if you remove the speaker grill you will find an inspection plate made of masionite---the focus/screen block is visable behind it----get a flashlight and look carefully at the block---one row of 3 plastic shafts is Focus(don't touch those) the other 3 are Screens(you should see R, G, B marked) go to a blank video input(one with nothing attached) and turn the RED SCREEN CONTROL JUST SLIGHTLY TO THE LEFT UNTIL the red goes away.
I assume this is an LCD. I don't remember the s4 being a DLP projector.
This sounds like the LCD panel used for the red color has gone out. The image is made up of red, green and blue images layered upon the screen. If the red panel has gone out then there is nothing filtering out the red light in the image. This causes a nice red hue to the whole screen.
It could be a simple open and reconnect fix. I personally have never opened a projector, so I'm not going to walk you through it as I do not know how hard it would be to tinker with. It should eb a cheap fix for a true repair man though.
NOTE: ----DO NOT TOUCH THE CONVERGENCE BOARD " -------
1. Bring Up 1 Projector Light
2. Bring Your Color Convergence + Sign and Should Be Center In Your TV
3. If Not Adjust Center with The 2 Tabs Just Above That Projector Tube You Have Lighted 1 Tab Will Move + Sign Horizontal Then Roll The Other Vertical Then Roll..U Will See--"
4. Once Your + Sign Is Center Turn Up Your 2 Other Projectors Make Sure They Are Able To Adjust Across The + Sign You used 1st Make Sure the 2 Other + Signs Move Left And Right And Up And Below The Vertical and Horizontal Lines. If Not Adjust There Tab to Make This Possible.
5. Using Your REMOTE Converge The + Signs Together.
---------------- IF YOU MESSED WITH THE CONVERGENCE BOARD -------------------
6. Now Lower The 2 Lights So Your 1st Projector Is Lighted
7. Bring Up A Menue On Your TV -- Look At It ...Are The Lettering Center and Square ..??
8. If They are Lower That Projector and Light Your Projectors 1 At A Time To Verify Letters are Center and Square.
---------------If You Have To Adjust The Menue To Bring Center And Square --------
9.Looking At The Convergence Board You Will See 3 Rows Of Adjustment Dials Each Row Is For 1 Projector.
---TAKE NOTE TURN THE ADJUSTMENT Slowly---
10. Locate The Row that will adjust The Projector You Have LITGHTED"....
11. Label On A Paper What Each Knob Will Do To The Screen Very Help-Full
12.Adjust Your Letters Dead Center and Square then Lower That Projector Light And Bring Each Projector Lighted At 1 Time To Verify Menue Is Center And Square.
13.Leave On Your 3rd Projector and Bring Up Your Light On The 1st Projector
14. Adjust the Letters Of Your 1st Projector Over The Letter Of Your 3rd Projector
15. Switch To Your Convergence + Sign To Help --Turn Knobs Slowly ---
16. Make Your Letters Merge Together And Your Lines Square.
17. I Use The Top Letters and Lower Letters And Keep The box Square
18. Hey If Your Projector Colors When Looking Through The Rear Of The TV Are Not Equal With Take And loosen The Wing Nuts And Turn The Lens To Focus the Color and Make Narrow Or Wide....All 3 - Equal
DO NOT GET UPSET THIS WILL TAKE TIME MAYBE ALL DAY SO RELAX HAVE FUN"
Do Not go Sticking Your Hand Into The TV While TV Is Plugged into The Wall" ---
hold down the blue lettered function key "fn" located 2nd left on bottom row....the press the function key F3 / F4 / F5 / F6 whichever one has the small icon that looks like a square/rectangle....it toggles in3 positions so if it dosent work first time press the same keys again...make sure your projector vga cable is connected to the correct vga input socket and select the input device on the projector to computer and not video
We need a better description of what you mean by shadowing. However I am assuming:
1. You mean it ''bleeds'' off to the right when you have something with a hard red/blue drive.
2. When you turn the contrast and color down a bit it gets better.
unfortunatly I cannot tell you how to fix convergence, but I can think of some other possibilities.
In this case the red/blue emmision of the crt is dying off and going into saturation when driven hard. To fix, replace with a new picture tube/crt. In some cases you can get a little more life out of that tube (with a watchable picture) by having the screen, focus, cathode bias, and drives slightly readjusted. It will take someone with experience in doing these adjustments on a weak tube to get it looking as good as possible.
Given the construction of the cathodes (guns) in that crt, only a very low level crt reactivate should be tried on it. The hard rejuv most crt testers give is highly likley to completely destroy the cathode on that crt.