20 Most Recent Vizio VT470M 47 in. TV Questions & Answers

Im having similar problem and with my limited knowledge of lcd tvs and the voltages ALL being good except the pwr on or sw on voltage from the main board to the power supply which tells it to switch everything on Im guessing that something is going wrong on the main board. In the condition where it freezes it (the power on V) which switches everything on i get varied voltages such as 2.5 or 3 or (the normal 5v) and then when nothing powers up (blank screen) i read 0v on pwr on voltage but all my other voltages are corect (24v to inverter, 12 v to main board, 5v, etc.) Im guessing from researching this is that there is in improper voltage somewhere in the main board circuit. I have been unable to find it so i may order another board and post back.

Check the contacts for channel and volume on the remotes.

You could have Bad Capacitors on the Power supply board they will be vented or swollow on Top
1000uf 16v 2200uf 10v 3300uf 10v.
PTS they rebuilt boards 1-800-844-7871

Power board is of course most likely problem here and I presume you found no puffed up caps on the board.

There is no cheap boards. A particular model or TV will have the same type of board, and cost for it will be almost same to all spare part sites.

Visit the site named 'Electro-help' for more details. Click this link. View it in 'Flip card' option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. It will make search easy. Some times, the ads attached with each posts, both at the right and bottom, might help you to find the availability of spare parts. There are more than 850 posts to different brand TVs now.

use different input

I am pleased you found my flash light test useful. You have a ballast or back light problem. Probably just the ballast unit, so well worth repairing as the expensive bit is OK.
Check the ballast unit before seeking lamps.

where is channel set up

Sounds like a main board issue. Beware, some Vizio main boards can be hard to find and expensive !!!

If you have not been using the TV for quite sometime, moisture would have developed some defects inside the TV when you switched on. Sometimes even insects and lizards might get in and cause short circuits. Anyhow this might require attention by a qualified service technician.