Where is the on / off power button for the Samsung UE32F5000

As you didn't specify any specific model, one of the Samsung models uses this scheme to change power levels.

You begin by pressing the "Microwave" button once. Pressing it again will display different power levels, from low to high.

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/

To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

1. Remove and insert the battery.
2. Press and hold together Volume Up + Home + Power button.
3. When you see the logo Samsung release Power button.
4. When you see little man Android release the rest of buttons.
5. Then if you see recovery menu select option "Wipe Data/Factory Reset" with Volume buttons and confirm with Power button.
6. Scroll down to "Yes -- delete all user data" and confirm with Power button.
7. If the operation is completed select "Reboot System".
8. enjoy

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should be troubles hooted. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

It could be a faulty power button, you should have it checked out. The power button is a switch with two contacts and a common. When you depress the power button, it closes the circuit to common and lets the phone know that it should either turn on, turn off (after holding the button for a few seconds) or lock the screen if only depressed for a second. A faulty power button has the circuit CLOSED all the time so the phone never turns on, gets stuck in a boot loop, please visit http://www.zfixit.com/samsung-s3-power-button-repair/ for a better description and repair options available for this common Samsung problem on all Galaxy models.

Warning! All data will be lost after hard reset.Please make backup first.
1.Power off your phone
2.Press together volume up + home button + power button until you will se Samsung logo on the screen
3.Select with volume buttons "wipe data/factory reset" and press power button to confirm
4.Select "yes" and press power button to confirm
5.Wait until format is complete
7.Press power to confirm "reboot"
8.Wait until the phone restarts
That's it!
- See more at: http://factory-reset.blogspot.ro/2013/11/samsung-galaxy-s3-4g-i9305-hard-reset.html#sthash.IRpj0Oyt.dpuf

If TV menu comes on try another source via hdmi could be a source issue with hdcp or copy guard issues. Sound isn't copy guarded but picture is.

I’m happy to help further over the phone at https://www.6ya.com/expert/brandon_60dfebff379d64bd

Ouuuuch.Please explain exact details of what is said.Email me at "[email protected]"not quotations.I may not be able to answer,but I will try

Series 5 32" Samsung F5000 Full HD LED TV User Manual:

copy this link into your internet browser to see:

http://downloadcenter.samsung.com/content/UM/201303/20130307133547049/[WEB]X13DVBEU1F-ENG.pdf

.