Tv wont come on , and green light keeps flashing, tv model 42pf5521d/hd

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power led, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating, to many popular brand TVs and other devices. Viewing it in "Mosaic" will make surf easy.
http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience. Unlike other brand sets, counting the number of blinks to Philips it different. It is not directly countable. Check the site for more details.

The main digital board should be suspected. Check this for more details. There are so many reasons for this fault. The flashing of LED at its front panel denotes this. Count the number of flashes. You can get more details form the site linked above.

Check power board . Replace any capacitors that have domed tops.

Several capasitors in the power supply must be replaced.

my tv keeps turning off i have a mitsubishi wd-73737 what can i do to fix it?

The error code of 2x red flashes tells me you need a Y DRIVE ASSY and the part number is AWZ6649. It should be replaced by a Technician thou.
Hope this hleps

Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, [Exclude the model number] in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
Counting the number of blinks to Philips TVs is entirely different to that of other brand TVs. It is not a direct count procedure. The site have details about how to count the number of LED blinks [Fault Codes] to Philips brand TVs are given; along with details of the faulty circuit location.

that model is famous for having bad flybacks. fortunately they arent exspensive and there easy to replace. you can get a new replacement at the following link for less than 50 bucks and they give free instructions on how to install it properly.
http://servicemanuals.vstore.ca/

i have a nlc-3204bc funai hd ready, the stand by light keeps flashing red on and on, can not switch it on

Press and hold the menu button on the side and hold for five seconds, that will reset the tv ------------- do this after you have checked your manual for other troubleshooters, you know, the obvious 'correct channel i.e EXT1, EXT2, TV'