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Intermittent start of bulb

I was thinking this is a ballast problem. it won't hurt to take the top of the back of the tv to repair it.

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Re: intermittent start of bulb

I had this problem and I thought it might be the bulb. I ended up switching to "high altitude" mode and this problem went away.

Posted on Apr 18, 2009

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Re: intermittent start of bulb - Multimedia Projectors

Either Ballast or Lamp !

Posted on Apr 01, 2008

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Ballast uart

The ballast powers the lamp. Keep the old lamp. I think it will work once the ballast circuitry is fixed

Dec 18, 2013 | Multimedia Projectors

1 Answer

Bypass ballast

I think your projector has a vip 4ac / 380 ballast. When u open the top and the back cover u will see it .u need to tacke of the motherboard unclipp the tree cables to get access to ballast board. The 5 pin cable running from the right top of the main board goes in to the ballast board where u will find 3 photocupplers 2 on the side twords the back and one on the other side. U need to shunt the two pins of the bottom one (those facing the 5 pin cable )
In that way will runcontinuously but u need an external power supply for your new bulb.hope will work for

Sep 29, 2013 | Dell 3400MP Projector

1 Answer

The projector tuns on fine and everything comes up alright, but the projection is not bright. I have changed bulbs and it does not seem to help. It showes that it is using both bulbs I think but the fans...

The fan that's not blowing warm air indicates that that bulb is not igniting. The best way to troubleshoot it is to switch the bulbs, just to make sure that it is not the cause of the problem. It the issue stays the same, that would be an indication that the lamp ballast is defective. However, it might just be the ballast that's causing the issue.

Aug 05, 2011 | Christie RoadRunner L6 Multimedia...

1 Answer

I have a infocus IN35 that at 100 hours burnt out a bulb. Thinking that it was just a bulb problem I bought a new bulb and it lasted 20 minutes. a shop said its probably the ballast that is the...

It is not a common problem. Ballasts rarely need repairs. Have you reset the lamp hours to zero after installing new bulb? If, yes to confirm about ballast please ask the TV repair shop man whether previously he had repaired any DLP projector. There is lot of difference in technology of DLP projector & TV (except DLP Projection TV). The problem could be in the projector main board. The lamp lights after getting Lamp ON signal from the projector main board. As the lamp ignites the ballast sends the signal of Lamp Lit. If the projector board senses that any blower/exhaust fan or colour wheel is not running then it will send a signal to Switch OFF the lamp. If you are tech-savvy then do as follows to check about lamp & ballast. Remove 5 pin connector from the projector. Connect projector to mains supply. Get a 5V DC power supply. Connect +ve to pin 3 & -ve to pin 4 of the ballast connector from this supply. The lamp should light. If it does not light then there is problem in the ballast (if the lamp is new). To give a chance you can check it for your lamp which lasted 20 minutes. Generally ballasts are made by OSRAM. You can get the ballast from OSRAM dealer. You will need the part number for that. Take out the ballast, it is there on it.

Apr 14, 2011 | InFocus IN35 Projector

1 Answer

Every 15 min or so my tv shuts off and a over temp light starts falshing on the front of my tv and the bulb has just been changed in january.

Looks, like one of your temperature sensors has been damaged. May be due to severe overheating by old lamp. Or: the lamp could be improperly installed. Heats up, then connections to ballast fail, lamp quit working. Next possible cause: did you clean air filter? Vacuumed or blow fans with compressed air? Another possibility: If there was not a significant dust accumulation inside of lamp compartment, the ballast board itself can be at fault. In any case, unit might behave the way it does now. Also: have you reset the lamp timer? In projectors, they won't just give you annoying message via "on screen display". It might think, that you never replaced the lamp, just took it out and put back in. You must reset the lamp timer first. The procedure could be in owner's manual or come with OEM replacement lamp. Generics or "bare" lamps might lack that note. Panasonic wants to stay in a business!
Good luck with your project,

Jun 13, 2010 | Panasonic PT-D5600U DLP Projector

1 Answer

Replaced bulb but now won't light up

The pop you heard was not likely the lamp but a part in either the main power supply or the ballast. This is not a DIY repair. I would suggest that you get a repair estimate from a local service shop. My first inclination is that the ballast has failed.

The ballast is part number: DSETUD147FMF9
Total cost: $285 with a core of $120. This means that upon the return of the "bad" ballast, you will be refunded $120 making hte final cost $165 for the part.

Hope this helps,

May 25, 2010 | Sharp XR-11XC DLP Projector

1 Answer

Lamp died and remote does not work

I don't think the problems are related. The bulb shouldn't have failed as it is rated at 2000 hours. As for testing the ballast I don't believe that a conventional meter would do it. You would need a lamp testing device. For more go to Since projector lamps or ballasts are not cheap you may want to have a a/v repair shop check your projector, because of the early bulb failure.

Feb 02, 2010 | BenQ PE5120 Multimedia Projector

2 Answers

I turn tv light comes on but i get no picture or audio....then light indicator blinks red

Lamp or ballast(if lamp has been replaced) is bad.
Explanation: green comes on: system works, waiting for light to shine into light engine: no light is coming out of lamp, system shuts down, then you see red! how to determine: pull the lamp out of the unit's compartment. Inspect lamp: bloated stem? shuttered? reflector is not shiny? Chuck it!
Lamp looks good or just been replaced: try ballast. Close lamp compartment without lamp itself. Make sure, door is shut, as well. Turn unit on and listen close to lamp compartment: good ballast will make a buzzing noise, then stop. You've got "red'! No buzzing: ballast quit. Needs major repair! Lamp must be good, for sure, to get to the last part of diagnostics. Conclusion: more, than 2000 hours of usage: replace lamp first!
Good luck,

Jul 29, 2009 | Panasonic PT-D5600U DLP Projector

1 Answer

It lights up then after a few minutes it goes off. red lights go on. the fans are working and the fan screen is clean

Hi I am Vortash sounds to me like a ballast or bulb fault this could be one of those silly faults you sometimes get .. the unit thinks the bulb has gone .. why because it goes out the processor is told this and the machine acts accordingly . Now I have had where the plug that is in the bulb housing is at fault the connectors expand under heat part and the bulb dies also had the same where the fittings on the end of the bulb wires are not secure and the same happens .. Also it could be a more serious Ballast failure or simply dry joints around the ballast unit ... without looking for myself I couldn't be sure but this is where I would start .. hope this is of help Regards Vortash

May 17, 2009 | Toshiba TLP 671 Multimedia Projector

2 Answers

Projector restarts after 30 minutes or so

Hi jamble77

This sounds like a faulty Ballast ( lamp's powersupply ) if it made a grinding noise and now the Projector shuts on and off intermittently.

I would advise you to rather have the part replaced than repaired , as in most cases the Ballast almost always returns with the same problem if repaired a couple of months down the line.

May 20, 2008 | Panasonic PT-AE900U Multimedia Projector

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