I have a mitsubishi tv Lt-46164 and it has 4 HDMI ports but they not working so what do i need to do or what part do i need to order thanks

Your television hdmi ports are no longer working. You could try to solder new ports onto the board, or you could take it to a specialist in television repair.

Mitsubishi LT46164 has a known issue developing on the main board that causes what you describe (and other things):

http://www.coppelltvrepair.com/p/1635/repair-service-for-mitsubishi-main-board-934c374002-causing-dead-tv-blinking-loop-no-hdmi-no-audio-etc-problems

A firmware update is not likely to resolve the problem - you are just missing HDMI input functionality.

But it won't hurt to get the latest firmware if you can.

Blinking light means your bulb is blown and needs to be replaced. Very easy to do. Check owners Manuel . Shop the bulb on ebay

Check and replace all the electrolytic capacitors at the power secondary side [DC] side. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
http://electronicshelponline.blogspot.com/

Mitsubishi LT46164 has a known issue developing on the main board that causes what you describe (and other things):

http://www.coppelltvrepair.com/p/1635/repair-service-for-mitsubishi-main-board-934c374002-causing-dead-tv-blinking-loop-no-hdmi-no-audio-etc-problems

Mitsubishi LT46164 has a known issue developing on the main board that causes what you describe (and other things):

http://www.coppelltvrepair.com/p/1635/repair-service-for-mitsubishi-main-board-934c374002-causing-dead-tv-blinking-loop-no-hdmi-no-audio-etc-problems

Once in a while my Mitsubishi LT 46164 will turn off on its.

Mitsubishi LT46164 has a known issue developing on the main board that causes what you describe (and other things):

http://www.coppelltvrepair.com/p/1635/repair-service-for-mitsubishi-main-board-934c374002-causing-dead-tv-blinking-loop-no-hdmi-no-audio-etc-problems

1. Check the computer for changing output (some computers use <F5>, <F8>, depending on which brand they are. I believe Sony uses <Function><F7> or <F7>).
2. Check what channel the HDMI port is on (e.g. AV1, HDMI1, HDMI2, etc.) - you need to know this if your TV doesn't automatically switch to the new input.
3. Plug the HDMI cable into the TV HDMI cable-in port.
4. Plug the HDMI cable into the laptop HDMI cable-out port.

5. Turn on the computer.
6. Press the <Function><F7> simultaneously ONCE. The screen should flicker and show up on TV.
7. Sometimes you may have to go to "Display Preferences" and select Dual Monitors or external monitor if your computer doesn't do it automatically. Repeat Step 6 after.

** You may have to adjust Display Resolution to 1024 x 768 or lower in order for the TV to work. After it works at a lower display (800 x 600, for example), you can adjust the resolution to the maximum the TV can accept.

The tv are developing a power suply board problems or tv Tuner signal board is mulfunctioning.The tv is new take it back were u bought it.Get it replaced,with another tv,don't take any of their explanation.