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This unfortunately has become a widespread problem with this series of Mits televisions. You can read a forem about it here: Flashing green light of death
But there is hope, Mitsubishi has instituted a rebuilding program for the chassis inside of your television. Any authorized Mitsubishi repair center should know about how to get you set repaired. It's not cheap (expect $500-$600) and it takes a few weeks, but it will save your TV.
Hi, Its symptoms of weak lamp that need to be replaced. How old is this TV and did you replaced its lamp recently? lamp replacement is easy and would be written in user manual. Please buy Sony original lamp for TV safety. Thanks.
you need the front panel PC board . You can get one most likely at the following link, just leave them an email and indicate your model number and what youre needing they will respond quickly. http://servicemanuals.vstore.ca/
Wish I could be more of a help to your problem. I have found that, in the power supply area, sometimes a scr or switching transistor is heating up, or a cap feeding that section is breaking down. As for the blinking lights, that indicates the problem area by knowing the proper code sequence. You do need a service manuel to find those codes. ( One can be obtained on line for a cost by using your google search ( service manuels).
Good Luck, and I hope in some way I have helped
Cheers Back to you
Ed ( Radio Man )
Most likely your "light engine" needs complete replacement and it is quite an installation...If not under warranty, usually Hitachi will NOT charge you for the light engine assembly (about as big as a bread box) for this particular V500 series because of all the failures they are aware of..However Hitachi will require a technician to do the installation and first verify that the light engine needs replacement...Hitachi will NOT pay for labor unless the tv is still under warranty. Labor varies. I know that for this 3 hour procedure or more, including calibration after replacement as necessary, I charge $400 or more..Above all pick a highly recommended technician..
Sorry for the bad news.. this happens alot to the V500 series. colors vary..sometimes red and sometimes blue ...this problem due to overheating. The replacement should be an improved assembly, sometimes rebuilt, sometimes new and both usually upgraded so this does not happen again. Do not attempt repairs on this yourself as it requires great expertise; and disassembly and reassembly of top portion of TV requires 2 people. And, on top of that, ever so often the lamp for this tv has to be replaced after a certain amount of hours of play (hopefully 2 years depending on hours of use) and just the lamp alone which you CAN replace yourself is $260 give or take more or less money. Always research any NEW TECHNOLOGY TV's thoroughly before you spend mucho bucks so you know what you might be in for. I try to avoid buying cutting edge technology myself as it's not fully tried and true and tested by any means. It cant be avoided if you want to buy the latest and the greatest motherboards for computers and once in a while I get burned like anybody else. But motherboards are usually only a couple hundred bucks, not thousands of dollars!
The buzzing sound you most likely hear is the ballast trying to fire up the lamp. I would say replace the lamp and yes they can act up at will. If this is the first lamp replacement ever then you are doing good.