It is plastic and attaches on the back side of the front panel and touches the switch on the control panel
Its called a micro-switch and they are fairly generic--look for a parts set similar to yours. If you need the actual plastic button array try Toshiba who might still have it.
SOURCE: Blinking power button
You likely have bad convergence output IC's that have caused one of the supply fuses to blow. This repair will have to be performed by a qualified technician. If you were in our area and has us repair this the total cost of the repair would be about $340 if I am correct about the cause of your problem.
I’m happy to help further over the phone at https://www.6ya.com/expert/dewayne_4a10eab6caecdb92
SOURCE: Toshiba 55" 55H70 model. Turns OFF, but won't turn ON until I unplug it from the wall first.
sounds like loose connections on the convergance amps ic's
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
SOURCE: 65 Toshiba picture sides are bowing in.
Convergence amp ic bad
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
http://www.hdtvoice.com/voice/showthread.php?t=28929
Or send to ptscorp.com
http://www.hdtvoice.com/voice/index.php?s=
good luck
please mark the post with a fixya
SOURCE: Television Problem
I have just run into the same thing, prior to the picture not coming on there was a loud whining noise, I thought it was the fan in the back, but, what I tried was removing the lower back panel, LIGHTLY tapping the light wheel assembly just left of the Bulb housing, and using a shop vac to first, **** the assembly around the edges and then reversing the air and Blowing it out. After much dust and dirt flying around the TV came on. It now only makes a little noise now and then, but, I will try this again today and then put the back panel back on. Since it would probably cost as much as a new TV for the color wheel, I gave this a try. For now, it is working.
Mr. Wizard
SOURCE: Toshiba TZ50V51 50 in. Rear Projection Television Problem
There is a toshiba shutdown circuit and power supply troubleshooter at the following link that covers your model and they will help you diagnose the problem for free when you order the manual which is emailed to you within minutes. Its listed under their Toshiba category
http://servicemanuals.vstore.ca/
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