How do I know if the lamp ballast is defective on my Mitsubishi dlp tv?

Might not be the bulb! IT could be the ballast or a temp sensor.

Anon, the bulb/lamp plugs into the ballast, The attached videos shows the ballast and location near the end of the video. Check the attached links. Good luck
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Mitsubishi Toshiba Samsung DLP TV Bulb Won Turn On DIY Easy DLP Ballast...

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DLP TV Repair Tutorial - DLP Bulb Won't Turn On - YouTube

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• New Lamp Doesn't Turn On? Try This! - Fix Your DLP - FixYourDLP.com

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Sounds like the ballast is having an issue. The ballast is easially replaced and should be available from www.tvcircuitboards.com

Don't know if this applys to you but if you have purchased anything but Osram or Philips replacement lamp for your DLP tv then this is probably your problem.. The generic is VERY tempting in this recession but in this case generic is poison to your dlp tv... i have a Mitsubishi 60735 and went thru 2 generic bulbs when my tv kept shutting down on it's own and the lights on front would flash, i could cut it back on for 10 minutes then flicker and shut down again ..well since the bulb was new i thought it may be defective so i got is exchanged for another one ... after all of the post i have seen how much repairs were going to cost on dlp sets no matter what the problem was ..i was ready to chunk the tv out the door when the second lamp was doing the same thing.....!! well a last ditch effort to save my tv before i trashed it or taking it apart to dissect it.. was to buy a brandname lamp ... in my case i purchased a Philips ..it cost twice as much =/ ..i could just return it if it didn't work.. well it was the generic lamps that was causing trouble.. the brandname worked perfectly .. i am just glad the generic lamp didn't do any damage to my TV!!! I have done further research on the generic lamps and realized that the damage it could have done was not worth the money i saved when i purchesed it... Generic is a great deal In some cases (household cleaners, etc..) but in this case GET THE NAME BRAND!!!! the only name brands i know of for these lamps are Philips or Osram/Sylvania.. hope this helps others from this headache. Do your research don't by generic lamp replacements, your DLP set cost to much to risk it.

Had similar problem. Thought it was the lamp. Examined old lamp but it appeared to be good. Ordered a new one anyway. Changed the lamp but the TV screen would not come on. It would make the usual noise as it was going to come on normally but it would cycle 3 times & then turn off. The LED lights in the front panel would indicate a defective lamp. Then read about the ballast. Changed the ballast & still same problem. Tried starting the TV without the lamp installed & noticed that the color wheel did not spin. Removed old color wheel & discovered it was broken. This appears to be the cause of all of my problems. I wish I new earlier of the test-turn on the TV without the lamp being installed & check to see if the color wheel is spinning. Would have save money on the lamp & ballast.

replace the Lamp its going Bad 1-800-628-1118

Even though the Lamp looks good it does not mean that it is. The only way to know is to relace it. If you have already replaced it with a Mitsubishi Lamp Assy. then the Ballast board would probably be the cause.
Hope this helps,
Skyassoc

the pins that protrude into the lamp compartment have a tendency to get out of alignment where the lamp will only make partial contact. It sounds like what youre describing.

The bulb may be defective or it may be the ballast. The bulp is alot cheaper, try replacing the bulb first.