Ln46a550 picture freezes when turned on

SOURCE: TV goes on and off every few seconds

sounds like a bad backlight

SOURCE: sharp aquos display comes on for a few seconds then blank screen

I have the same problem with my 37" HP which is the same as Sharp Aquos, it's bad backlight inverter boards, the screen comes on for a second then nothing, no menu, no channel change indicator then turn it off and you hear the clicking of the power supply about 10 seconds after.

SOURCE: samsung tv turning off by itself

I had a similar problem where my 61" Samsung DLP was turning itself off very frequently I had resolved to try replacing the bulb. I called a local TV repair place to see if they had my buld in stock. The guy I spoke to actually told me how to fix my problem! There is a little blue switch behind the bulb access door. The inside of the door has a little piece that presses the switch down. The switch is supposed to work correctly weather the switch is in the up or down position but samsung forgot to take expansion from heat into account. If the switch is held in the upper position by the door and the plastic expands to a certain point, it triggers the set to shut off. This does not occur of the switch is held in the lower position. What you need to do is take the access door off and put it back on by sliding it into position from above. That will hold the switch in the down position, eliminating the problem. My set has not **** itself off ever since.

SOURCE: frozen picture on LG LCD 37"

Try One of your working TVS and connect it to your cable outlet of the TV that is having problems. If that TV Does not work then there may be a degraded fitting or the Leg coming of the splitter to that outlet could have a Low Signal Problem
Next Take the First TV that was not working properly and put it on the cable outlet of one of the TVs that is working properly and if the TV set works on that Channel then you know it is not your TV that it must be the cable

SOURCE: Magnavox 42MF130A/37, no picture

IF your not getting sound and its shutting down it could be a the main board, or the power supply (huge board in there.) I just got done parting one of these tvs that was in a vacation rental. the tv met with an unfortunate accident so the screen was cracked and so on. Anyhow if your intrested i have the main board and the power supply board for that exact model. I was listing them on ebay and saw this post. Listing here. I am going to probaly get about 25 buck a board (very cheap) plus shipping. IF your intrested let me know and I list that power supply board as well. I can't guarentee it will fix it but its worth the shot for 50 plus shipping. form my experience with mostly LCD tvs if your not getting sound odds are its the main board. I also listed what was refered to as the signal scaler (logic board)