<!-- from fixya rte -->Why does my tv go off frequently? - Mitsubishi WS-55807 TV

If the TV keeps On/Off frequently, and do not switch On, there is some fault with its its internal circuit. It sill be best to contact any technician in this mater.

If you mean by this that their is an occassional echo, then this is a frequent problem with digital reception and not a fault with your TV. This is a wide spread problem that doesn't appear to have a solution

Do you live with someone who likes practical jokes; even silly ones?

There are a number of companies that make remotes that can mess with someones TV or other remote devices.
I have a watch, as a gag, that will self program its remote to operate any TV capable of this feature. With this watch, I can change channels, power status and even reset the TV to factory default state.
Next time this happens, look behind you.

Click here to download the user manual to your TV. It has all details.

Good day!!! That problem is cause of faulty capacitors on the power supply... just look at the actual image of it through visual check if the capacitors look like leak/bulged on top you need to replace it to end that problem... hope it helps... \thanks for using fixya..

First off all, check your TV fuse for blown. The totally dead TV frequently cause by simple thing, the 'Fuse'.

which is not polarity

make sure you have not accidentaly scheduled a power off and on if yes torn off/disable them if not check that your power cable is secure

Its possible this could be resolve without taking the tv back. Make sure it's not the source. IE cable box, xbox or ps3 etc. Try swapping out wires. If all else fails, then one board should be the culprit. I believe (If my memory serves me correctly) the name of the board in the A-board. The input board. If its under warranty, then you may want to call for service.

When switching to STBY raster remains and buzz noise is heared from the speakers
Cause: +B voltage (103 V) does not switch-off. Remedy: Replace defective C541
Ticking noise and line in picture
Transistor 7381 (BC848C) defective when hot
Dead with ticking noise from line
Replaced C622, C604 and Q509