How can you reinstall the base back on the tv?

No.
Stand or base on any model of TV should be removeable without taking the back panel. How to Remove Pedestal Stand from Your TV YouTube

The tv has four srews located twords the bottom back of tv. Remove the four screws than lift tv off the base. Make sure you keep the base and screws because they are pretty expensive. Hope that helps.

depends on what TV you have. Most TV models i've dealt with, you need to remove the whole back of the TV and take the base out. Some smaller LCD monitor bases like Dells are attached only by a latch. Some bases are held together by 4 screws where the VESA mount would go.

Put LCD TV on a pillow, with screen resting on the pillow. Now the base will be free in air. Then remove screws at the back of TV, where base is joining. You might need a screw driver with magnetic head to remove screws. After removing screws, slide the base clamp out from the back of TV, and you are done.

I just had the same issue - i've had them for about 18 months and they were working fine with my regular tv set - connected the red/white analog plugs to the back of the tv and then other 3.5mm end to back of base... but now, i just bought an LG hdtv and had to reverse that connection... 3.5mm to the tv and the analogs back to the base... worked ok for about 10 mins then the base shut off... seems that the volume setting on the hdtv wasnt up high enough to "register" with the base - base thought nothing was happening so it automatically shut off for "inactivity" - so, when plugged into tv, I turned the tv volume way up to 100.... seems to have worked - just need to be sure to turn the volume on the tv back down before removing the headphone jack!

take the back off and plug it in. there is a green LED on the power supply that should show if its getting the 5Vdc standby power . if thats not lit up check the fuses on the power supply . there are 4 fuses on the power supply in the unit. the power supply is a medium sized board right in the middle of the tv when you take the back off . you can probe it for power as well if you have a multimeter , all the voltages are listed on the back of the power supply and clearly marked on the connectors . hope it helps

There are four screws on the back of the tv that have an s near the screw hole. Unscrew and slide mount off. On the base unscrew the 4 screw and reinstall the cover to the tv. Install the 4 screw in the holes that have an s on them and you are done.....
Hope this helps

Buzz

Lay the TV face down on a flat surface covered with a cloth. Back out all the screws holding the base stand. Hold the back and front against the base shank while tightening all the screws through the base. Make sure they are tight.

You don't have to mess around with the screws on the bottom of the base.

There are 4 screws on the back of the Toshiba that are in line with the wall mounting screw holes.

Remove the 4 screws and the base falls off.

to remove base from insignia tv
1)remove plastic cover from bottom rear of tv
2)remove 8 philips head screws on rear of tv above base
3)pick up tv and base will come off

once you remove it you realize how easy it is