Whats' your recommended repair of my Vizio P50HDM? The following symptoms prior to complete shutdown dark screen with working audio: dots or speckles, inside cabinet noise, and a loud popping noise

can you attatch a picture ?

Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do asearch by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis.

It looks like DLP chip is failing. It is installed on DMD board that in turn belongs to optical engine. Issue should get progressively worse. If you look at screen up close - you see that "tumbprint" consist of little small dark-gray squares, some of them flickering.
Cheapest solution - to replace DLP chip. instead of replacing whole optical engine.
This repair have to be confirmed (by running test patterns in service mode first) and done by professional.
Repair could cost aroung $400.
During procedure I would recommend to turn ceiling fans and other air blowing devices off. Single little dust speckle landing on the chip surface will ruing all effort and same amount of labor have to be applied yet again just to get rid of it (been there, done it).
Good luck.
Russ.

optical block about 900 unless you can get a good used one. thats a common problem with that model

You have a bad light engine call Sony and see if it might be on their extended warranty list.

this is most likely the sustainer board(s) problem. Replacing the sustainer boards should correct this problem for you. you can get the parts at vancebaldwin.com

approximately $575

The blinking light indicates that the high voltage section has shutdown because a problem was detected. There are a number of possible causes for this. Was there any other symptom prior to a dark screen?
Dan

Hey did you ever get rid of the "racing stripes"?? my P50HDM now has the same problem...i know this is askin for spam but if anyone has the solution email me at [email protected] thanks

Hey guess what?! After Costco shafted me good, told me to get lost, and slammed the concierge phone down, I called Vizio. THIS TV HAS A LIFETIME WARRANTY ON IT NOW!! They will fix/replace it at their expense! After a 5 minute call to their customer service they arranged the repair order. Vizio knows that this set is a lemon and they are actually owning up to it. The gentleman told me that this set now carries a Lifetime warranty on parts (to exclude a shattered screen of course) and labor! The repairman is going to come this way in the next week or so and I'll update you on what he says. So to all out there with problems on this set: CALL VIZIO AND GET READY FOR A BREATH OF FRESH AIR!