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NO DISPLAY How do i replace ballast? Thanks

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  • Anonymous Jan 26, 2009

    Ballast is apparently bad. How do I replace it?


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First, let us know what type of projector you have.

Posted on Dec 23, 2009

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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

How do I replace the ballast in an InFocus IN26? And while we're at it, where do I get one? I've already replaced the bulb with a new one (direct from InFocus), reset everything to factory settings, and...

remove the front and rear bezels, remove the top cover, take a picture of the location of screws and ground wire on the metal frame. remove the top boards, remove the metal frame and there is the ballast/power supply. pay attention to the way the cable is routed to the lamp connection, also pay attention to which way the connection from the ballast is seated in the lamp housing. hopefully a new ballast will fix it for you, as to where to get one, that's iffy. you could try to find an in26 on ebay that has other problems but has a working ballast

May 11, 2010 | InFocus IN26 Multimedia Projector

2 Answers

Projector turns on but does not illuminate bulb is good

may be either the colorwheel or the ballast. if you hear the colorwheel spin up (high-pitched whir), replace the ballast. if you don't hear it, replace the colorwheel.

Dec 11, 2009 | Sharp XR-10S DLP Projector

2 Answers

The fan on my infocus projector is on but the light does not come on

could be lamp, colorwheel or ballast. if you hear a high-pitched whir when you turn it on, the problem is not the colorwheel. check the lamp. if the inside is bulging, cloudy, and/or has black spots, replace the lamp. it's dead. if the lamp is ok, replace the ballast. you can send it in for repair (or get the part and do it yourself) to an infocus service center. try av solutions in ny.

Nov 27, 2009 | InFocus LP70+ Multimedia Projector

1 Answer

Display fails shortly after switch on before menu can be accessed

need more info (i.e.: model #). if it's a lcd projector, could be lamp, fans, dusty (overheating), or ballast. if it's a dlp, could be lamp, ballast, colorwheel, dusty, or fans.

Nov 21, 2009 | InFocus Multimedia Projectors

1 Answer

Only warming up, no longer displaying after warm up

the ballast is not striking the lamp. replace the ballast.

Oct 14, 2009 | Toshiba TLP-S70 Multimedia Projector

4 Answers

Hi, I have a Hitachi CP-RX70 LCD projector. When I plug it in the Power led is orange, when I press the Standyby/on button the fan goes on, power led goes green then it immediately shuts down and the power...

Hello...I used to fix projectors for several years...the problem you describe sounds suspiciously like a dead cooling fan--or more to the point, a fan might not be putting out a signal pulse telling the main board that it's running. (most of the fans in the unit will have 3 leads--red for positive, black for negative(ground), and a yellow one for sending out signal pulses) When you turn on the projector, it goes through a quick self test (you aren't aware of this) and if everything comes up roses, the lamp kicks in and you have a display. In case of any kind of error, the internal instructions tell the main board to immediately shut down, preventing damage.
Also, there might be a ballast problem( the circuit that provides power to the lamp) If you have a known-good lamp, put it in...if the same thing happens, most likely its the ballast that's blown out. The ballast fires a jolt of electricity like a spark plug to initially start the lamp burning. Then, it auto switches to a very low voltage with a *lot* of current(sort of like a welder's arc). After so much usage, the ballast gets weakened and eventually fails. Hope I helped...Rick

Aug 21, 2009 | Hitachi Performa CP-RS55 Multimedia...

1 Answer

Projector Toshiba TLP-T50 cannot display

if the lamp is bad, replace it. if not, replace the ballast.

Jan 09, 2009 | Multimedia Projectors

1 Answer

Projector issue

Hi maxima_90

The only other thing that could cause this once the lamp has been replaced is the Ballast ( lamp's powersupply )

If I could give you a tip , rather replace this part than repairing it , as I have found that the problem comes back most of the time on a repaired Ballast.

May 12, 2008 | Panasonic PT L720U Multimedia Projector

1 Answer


Hi cvijr

This can only one of two things - the lamp or the Ballast ( lamp's powersupply )

Normally the PB6100/6200 lamp's has got markings on the lamp itself when this flickering occurs.

Take out the lamp by unscrewing the lamp door at the bottom. Then look for any vein like looking marks in either black or white. Or even a bubble at the bottom end of the lamp's shaft.

If you can spot anything out of order , then the lamp will need replacement.

If not , then you'll know for sure that it is the Ballast that is in need of either repair or replacement.

Part Numbers :

Ballast :5D.J8612.011

Lamp : 60.J8618.CG1

Hope this is of help and thanks for using Fixya !

May 05, 2008 | BenQ PB6100 Multimedia Projector

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